CN101801857A - Water treatment method, water treatment apparatus, method for recovering purified water, and purified water recovering apparatus - Google Patents

Water treatment method, water treatment apparatus, method for recovering purified water, and purified water recovering apparatus Download PDF

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Publication number
CN101801857A
CN101801857A CN200880107777A CN200880107777A CN101801857A CN 101801857 A CN101801857 A CN 101801857A CN 200880107777 A CN200880107777 A CN 200880107777A CN 200880107777 A CN200880107777 A CN 200880107777A CN 101801857 A CN101801857 A CN 101801857A
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water
reverse osmosis
osmosis membrane
mentioned
dense
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CN101801857B (en
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谷田克义
长谷川进
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Shinko Pantec Co Ltd
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Kobelco Eco Solutions Co Ltd
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Priority claimed from JP2007280154A external-priority patent/JP5222526B2/en
Priority claimed from JP2007310271A external-priority patent/JP5075597B2/en
Priority claimed from JP2007333795A external-priority patent/JP2009154070A/en
Application filed by Kobelco Eco Solutions Co Ltd filed Critical Kobelco Eco Solutions Co Ltd
Publication of CN101801857A publication Critical patent/CN101801857A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/12—Controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/24—Quality control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/04—Oxidation reduction potential [ORP]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

This invention provides a water treatment method which can produce a treated water having a given level of quality. The water treatment method comprises allowing a raw water to flow into a membrane separation module using a reverse osmosis membrane to separate the water into a treated water and a concentrated water. The water treatment method is characterized in that the impurities of the raw water, the treated water or the concentrated water are measured and the quality of the treated water is regulated based on the measured impurity value.

Description

Water treatment method, water treatment device, the recovery method of purifying waste water and purified water recovering apparatus
Technical field
The present invention relates to utilize reverse osmosis membrane (reverse osmosis membrane) to make isolating water treatment device of former water (raw water) and water treatment method.For example, relate to and utilize reverse osmosis membrane, the former water that contains salt is implemented the water treatment method and the water treatment device of membrane sepn, in addition, for example, also relate to the recovery method of purifying waste water that has the unitary purified water recovering apparatus of reverse osmosis membrane and use this device.
Background technology
Before, be not easy to obtain the place of fresh water on island, area short of rain etc., water treatment method and water treatment device are used for the desalination of former water such as seawater etc., and the fresh water that obtains uses as tap water, agricultural water.
This water treatment of sea water desaltination must be removed with states such as negatively charged ion, positively charged ions and is included in various salts in the seawater, for this reason, is to implement membrane sepn with reverse osmosis membrane before.
Usually, when carrying out membrane sepn, implement following handling procedure with this reverse osmosis membrane, promptly, make the former water that contains salt, flow into by the separated spatial one side's side of reverse osmosis membrane, the treating water after the low desalination of this former water of the concentration ratio of salt, by above-mentioned reverse osmosis membrane, penetrate into the opposing party's side, like this, the high dense water of the former water of concentration ratio of salt is gone out from side's effluent, and, treating water is flowed out continuously from above-mentioned the opposing party's side.
For example, in the following patent documentation 1, put down in writing the technology that makes sea water desaltination with membrane separation assemblies.Above-mentioned membrane separation assemblies has the supply hydroecium that is separated by reverse osmosis membrane and sees through hydroecium.
More particularly, in the following patent documentation 1, put down in writing following technology.Promptly, make former water flow into the above-mentioned supply hydroecium of membrane separation assemblies continuously, make the low desalination of the concentration (below be also referred to as " salt concn ") of salt treating water, penetrate into through the hydroecium side by reverse osmosis membrane, making fresh water see through hydroecium from this continuously flows out, and the dense water that salt concn has been increased flows out continuously from supplying with hydroecium.
In addition, except the desalination of above-mentioned seawater, for example, the metal-salt that contains in the cleaning draining of Metal smelting factory etc. etc. is removed, when utilizing again etc., also implemented water treatment with this reverse osmosis membrane as the process water in this factory.
In the desalination of this seawater, the utilization again of plant drainage etc., usually, require to generate water with certain rank water quality with stable amount.
At this other stabilization of water quality level, guarantee the requirement of the stable water yield, aspect the stabilization of the water yield, utilization is across the pressure difference of the adjacent space of reverse osmosis membrane (for example supply with hydroecium and see through hydroecium) etc., can easily make quantitative changeization through the treating water of reverse osmosis membrane, so, can realize the stabilization of the water yield with comparalive ease.
On the other hand, about water quality, for example, the amount of the salt that contains in the treating water changes according to the amount of the salt by reverse osmosis membrane.The amount of salt that should be by reverse osmosis membrane usually, changes according to the amount of the salt that contains in the adjacent dense water of reverse osmosis membrane and the performance of reverse osmosis membrane.
Therefore, for example, (always) has the necessarily former water of (constant) salt concn if adopt often, implements water treatment, just can stably supply with water than being easier to certain rank water quality, but, for example, the cleaning draining of Metal smelting factory, because of the working condition of factory, the kind of manufacturing product etc., salt concn has than cataclysm, even in the desalination of seawater etc., salt concn also changes because of trend, RELATION TO CLIMATE.
In fact and be not easy often to be had the former water of certain salt concn therefore,, before, realize other stabilization of water quality level, be very difficult.
In addition, for this problem, almost do not study before, method is not resolved yet.
That is, there are the problem be difficult to stably to obtain have the water of certain rank water quality in water treatment method before and water treatment device.
In addition, purify waste water recovery method and purified water recovering apparatus are that (for example, patent documentation 2) such as manufacturings of pure water are used in the desalination that is used for seawater, softening, the general life of salt solution (mineralized water) before.
This purified water recovering apparatus, its advantage are can obtain more highly purified treating water promptly to purify waste water.
But, this purified water recovering apparatus, if as water quality deterioration former water to be filtered, that supply to the unitary supply water of reverse osmosis membrane (former water), then correspondingly, resulting water quality of purifying waste water also worsens.In addition, this purified water recovering apparatus when sanitary wastewater, plant effluent etc. are used as former water, can not stably obtain highly purified purifying waste water.
That is, the waste water of sanitary wastewater, plant effluent etc., its inorganic salt concentration, even within one day, also because of the time period is the fierce change in several times ground, the ground that is directly proportional with this change, the purity of purifying waste water also changes.
Patent documentation 1: the spy of Japan opens flat 9-299944 communique
Patent documentation 2: the spy of Japan opens the 2005-279614 communique
Summary of the invention
As mentioned above, the problem that all has the treating water be difficult to obtain certain rank water quality in the prior art.
In view of this problem, first problem of the present invention is, the water treatment method and the water treatment device of the treating water that can obtain having certain rank water quality is provided.Second problem of the present invention is, the water treatment method and the water treatment device of the water that can stably obtain having certain rank water quality is provided.Another problem of the present invention is even waste water such as sanitary wastewater, plant effluent, rubbish water seepage are provided, also can obtain the high purified water recovering apparatus of purifying waste water of purity and the recovery method of purifying waste water more stablely.
In order to solve above-mentioned problem, water treatment method of the present invention, make former water flow into the membrane separation assemblies that uses reverse osmosis membrane, former water sepn is become treating water and dense water, it is characterized in that, measure the impurity level of above-mentioned former water, above-mentioned treating water or above-mentioned dense water,, regulate the water quality of above-mentioned treating water according to the measured value of this impurity level that determines.
In addition, water treatment device of the present invention, have the membrane separation assemblies that uses reverse osmosis membrane, make former water flow into this membrane module and former water sepn is become treating water and dense water, it is characterized in that, have the impurity level determinator that at least one measures the impurity level of above-mentioned former water, above-mentioned treating water or above-mentioned dense water, according to the measured value that determines by this impurity level determinator, the water quality of regulating above-mentioned treating water.
According to this water treatment method and this water treatment device, the treating water that can obtain having certain rank water quality.
In addition, water treatment method of the present invention is, make the former water that contains salt flow into the membrane separation assemblies that uses reverse osmosis membrane, use above-mentioned reverse osmosis membrane, the concentration that the concentration that former water sepn is become salt is lower than the treating water of above-mentioned former water and salt is higher than the dense water of above-mentioned former water, and, make above-mentioned former water flow into membrane separation assemblies continuously, above-mentioned dense water is flowed out from membrane separation assemblies continuously, and above-mentioned treating water is flowed out from membrane separation assemblies continuously; It is characterized in that, to be controlled to be certain from the discharge of the effusive above-mentioned treating water of membrane separation assemblies and the concentration of the salt of above-mentioned treating water can be controlled at the mode below the preset value, according to the amount of the salt that sees through above-mentioned reverse osmosis membrane, the influx of above-mentioned former water is changed.
In addition, water treatment device of the present invention, have the membrane separation assemblies that uses reverse osmosis membrane, make the former water that contains salt flow into this membrane separation assemblies, use above-mentioned reverse osmosis membrane, the concentration that the concentration that former water sepn is become salt is lower than the treating water of above-mentioned former water and salt is higher than the dense water of above-mentioned former water, and, above-mentioned former water flows into membrane separation assemblies continuously, and above-mentioned thus dense water flows out from membrane separation assemblies continuously, and above-mentioned treating water flows out from membrane separation assemblies continuously; It is characterized in that, have being controlled to be certain controlling organization, and make the influx of above-mentioned former water change, thus the concentration of the salt of above-mentioned treating water is controlled at the controlling organization below the preset value according to the amount of the salt that sees through above-mentioned reverse osmosis membrane from the discharge of the effusive above-mentioned treating water of membrane separation assemblies.
Above-mentioned water treatment method and the above-mentioned water treatment device that makes former water flow into membrane separation assemblies continuously that makes former water flow into membrane separation assemblies continuously, owing to make above-mentioned former water flow into the membrane separation assemblies that uses reverse osmosis membrane, use above-mentioned reverse osmosis membrane, former water sepn is become salt concn be lower than the treating water of above-mentioned former water and the dense water that salt concn is higher than above-mentioned former water, the discharge of above-mentioned treating water is controlled to be necessarily, so, can guarantee the stable water yield.
And, this water treatment method and water treatment device, because the discharge for the treatment of water is controlled to be necessarily, so, flow into amount in the water yield of membrane separation assemblies, that see through the treating water that reverse osmosis membrane is removed for necessarily.
That is, this water treatment method and water treatment device, for example, the water yield that makes time per unit flow into membrane separation assemblies changes, and can control the concentrating degree of dense water thus.
Therefore, this water treatment method and water treatment device for example, according to the amount of the salt that sees through reverse osmosis membrane, change the influx of former water, the salt concn that can regulate dense water thus, the amount of regulating the salt that sees through reverse osmosis membrane.
That is,, change, the concentration of the salt of above-mentioned treating water can be controlled at below the preset value, can guarantee stable water quality by the influx that makes former water according to this water treatment method and water treatment device.
And the salt concn of dense water is conditioned, and also can suppress the pollution speed of reverse osmosis membrane thus.
As above as can be known, according to this water treatment method and water treatment device, in water treatment method and water treatment device, can obtain having the water of certain rank water quality with stable amount.
In addition, purified water recovering apparatus of the present invention, have to filter and to supply with water sepn and become that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water,, reclaim purifying waste water from the discharge of above-mentioned reverse osmosis membrane unit as above-mentioned supply water supply waste water by reverse osmosis membrane; It is characterized in that, having at least one measures the impurity level determinator of above-mentioned supply water, above-mentioned dense water or above-mentioned impurity level of purifying waste water and transfers above-mentioned purifying waste water and with above-mentioned supply water-reducible dilution path and walk around above-mentioned reverse osmosis membrane unit, above-mentioned supply water is not filtered and will supply with the path of the either party at least among water is transplanted on the downstream side as dense water the circuitous path; The measured value that determines when above-mentioned impurity level determinator is more than the benchmark value or when having surpassed benchmark value, implement the dilution undertaken by above-mentioned dilution path and by above-mentioned circuitous path carry out walk around among either party at least.
In addition, purified water recovering apparatus of the present invention, have multistage the filtration along water (flow) direction and become supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement, reclaiming clean water as supplying with water as the dense water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water from previous stage reverse osmosis membrane unit; It is characterized in that, the impurity level determinator and transferring that has an impurity level of purifying waste water of at least one the dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge or discharge is purified waste water or waste water and will supply with water-reducible dilution path and walk around the reverse osmosis membrane unit, supply water is not filtered and will supply with the path of the either party at least among water is transplanted on the downstream side as dense water the circuitous path; When the measured value that is determined by above-mentioned impurity level determinator is more than the benchmark value or has surpassed benchmark value, implement the dilution undertaken by above-mentioned dilution path and by above-mentioned circuitous path carry out walk around among either party at least.
In addition, purified water recovering apparatus of the present invention, have along water (flow) direction and multistagely to filter by reverse osmosis membrane that a water sepn becomes permeate water and non-permeate water is the reverse osmosis membrane unit of dense water supplying with, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the permeate water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, be recovered as purifying waste water from the unitary permeate water of any reverse osmosis membrane at least from previous stage reverse osmosis membrane unit; It is characterized in that, have at least one the dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge or discharge permeate water impurity level the impurity level determinator and transfer from this reverse osmosis membrane unit or the unitary permeate water of other reverse osmosis membranes or dense water, will lean on the water-reducible dilution of the supply path of upstream side than this permeate water or this dense water; When the measured value that is determined by above-mentioned impurity level determinator is more than the benchmark value or has surpassed benchmark value, implement the dilution of being undertaken by above-mentioned dilution path.
In addition, purified water recovering apparatus of the present invention, having to filter by reverse osmosis membrane becomes supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water, as above-mentioned supply water supply waste water, reclaims purifying waste water of discharging from above-mentioned reverse osmosis membrane unit; It is characterized in that, have the impurity level determinator that at least one measures above-mentioned supply water, above-mentioned dense water or above-mentioned impurity level of purifying waste water, and valve system, this valve system comprises the purification water valve of regulating above-mentioned flow of purifying waste water and regulates either party at least among the dense water valve of flow of above-mentioned dense water; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
In addition, purified water recovering apparatus of the present invention, have multistage the filtration along water (flow) direction and become supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the dense water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, reclaim from purifying waste water that discharge each reverse osmosis membrane unit from previous stage reverse osmosis membrane unit; It is characterized in that, have the impurity level determinator of the impurity level of purifying waste water of at least one dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge, discharge, and valve system, this valve system comprises the purification water valve of the flow of purifying waste water that adjusting discharges from this reverse osmosis membrane unit and regulates either party at least among the dense water valve of flow of the dense water of discharging from this reverse osmosis membrane unit; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
In addition, purified water recovering apparatus of the present invention, have along water (flow) direction and multistagely to filter by reverse osmosis membrane that a water sepn becomes permeate water and non-permeate water is the reverse osmosis membrane unit of dense water supplying with, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the permeate water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, be recovered as purifying waste water from the unitary permeate water of any reverse osmosis membrane at least from previous stage reverse osmosis membrane unit; It is characterized in that, have the impurity level determinator of impurity level of the permeate water of at least one dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge, discharge, and valve system, this valve system comprises the seeing through water valve and regulate either party at least among the dense water valve of flow of the dense water of discharging from this reverse osmosis membrane unit of flow of the permeate water that adjusting discharges from this reverse osmosis membrane unit; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
In addition, the present invention also provides and uses this purified water recovering apparatus, the recovery method of purifying waste water that purifying is purified waste water and reclaimed from waste water.
Have the purified water recovering apparatus of at least one side in dilution path and the circuitous path and utilize in the recovery method of purifying waste water of at least one side among dilution path and the circuitous path, when the impurity level of waste water is high, can grasp this situation with the impurity level determinator, correspondingly, at least dilution that can enough dilutions path keeps the water quality of the supply water of filtration stage well.Perhaps, can utilize circuitous path, water quality deterioration supply water from filtering object, remove the deterioration of purifying waste water that can suppress to obtain.That is, according to these purified water recovering apparatus and the recovery method of purifying waste water, even the waste water of sanitary wastewater, plant effluent etc., also can obtain more stable, purity is high purifies waste water.
Have the purified water recovering apparatus of valve system and use in the recovery method of purifying waste water of valve system, when the impurity level of waste water is high, can use the impurity level determinator, grasp this situation, based on this, the transmitance in the control reverse osmosis membrane unit, the deterioration of purifying waste water that can suppress to obtain.That is, according to these purified water recovering apparatus and the recovery method of purifying waste water, even the waste water of sanitary wastewater, plant effluent etc. also can obtain high the purifying waste water of purity more stablely.
As mentioned above, according to the present invention, can obtain having the treating water of certain rank water quality.
Description of drawings
Fig. 1 is the schematic block diagram of the water treatment device that adopts in one embodiment of expression.
Fig. 2 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 3 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 4 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 5 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 6 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 7 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 8 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Fig. 9 is the schematic block diagram of the water treatment device that adopts in another embodiment of expression.
Figure 10 is a schematic block diagram of representing water treatment device used in another embodiment.
Figure 11 is the purified water recovering apparatus of expression one embodiment and the sketch chart of the recovery method of purifying waste water.
Figure 12 is the sketch chart of a state of this embodiment of expression.
Figure 13 is the sketch chart of a state of this embodiment of expression.
Figure 14 is the sketch chart of a state of this embodiment of expression.
Figure 15 is the purified water recovering apparatus of another embodiment of expression and the sketch chart of the recovery method of purifying waste water.
Figure 16 is the sketch chart of a state of this embodiment of expression.
Figure 17 is the sketch chart of a state of this embodiment of expression.
Figure 18 is the sketch chart of a state of this embodiment of expression.
Figure 19 is the purified water recovering apparatus of another embodiment of expression and the sketch chart of the recovery method of purifying waste water.
Figure 20 is the purified water recovering apparatus of another embodiment of expression and the sketch chart of the recovery method of purifying waste water.
Figure 21 is the purified water recovering apparatus of another embodiment of expression and the sketch chart of the recovery method of purifying waste water.
Description of reference numerals
1: membrane separation assemblies.2: former water transport mechanism.3: the treating water conveyer.4: dense water transport mechanism.5: signal transmission mechanism.6: dense water also flows mechanism.11: housing.12: reverse osmosis membrane.13: supply with hydroecium.14: see through hydroecium.21: former water pipe arrangement portion.22: former water transport pump.31: treating water pipe arrangement portion.32: treating water quantification mechanism.32a: under meter.32b: umformer.32c: control line (treating water quantification control line).33: salt concn is measured mechanism.41: dense water pipe arrangement portion.42: dense water yield regulating mechanism.51: umformer.61: also banish pipe portion.62: the output regulating mechanism.63: go back flowing water quantification mechanism.100A: waste water.100B: purify waste water.100C: dense water.101: the reverse osmosis membrane unit.108: purify waste water and transfer the dilution path.109: circuitous path.120: the impurity level determinator.132: permeate water is transferred the dilution path.134: dense water is transferred the dilution circuitous path.200A: waste water.200B: purify waste water.200C: dense water.201: the reverse osmosis membrane unit.211: purify water valve.212: dense water valve.220: the impurity level determinator.231: see through water valve.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
[the 1st embodiment]
Below, be example with following water treatment, preferred implementation of the present invention is described.This water treatment, as supplying with water (being former water), this draining being separated into the salt that contains being lowered to the treating water and the salt concn dense water higher that can utilize state again as process water than former water from the cleaning draining of Metal smelting factory (below be also referred to as " draining ").
The water treatment device of the 1st embodiment is described earlier.
Fig. 1 is the schematic block diagram of the water treatment device structure in expression the 1st embodiment.
Among Fig. 11, the expression membrane separation assemblies.The 11st, housing, this housing forms the shell of membrane separation assemblies 1, and inside has formed the receiving space that stores former water and treating water.The 12nd, be housed in the reverse osmosis membrane of above-mentioned housing 11 inside.The internal space of above-mentioned housing 11 is by these reverse osmosis membrane 12 separated into two parts.
This reverse osmosis membrane 12, can adopt known before reverse osmosis membrane, for example, can adopt the diameter that forms by raw materials such as cellulose acetate, aromatic polyamide, polyvinyl alcohol to count the type of so-called hollow line film etc. of the hollow wire of mm, perhaps diameter than this hollow line film thick, have the type of the so-called tubular film of several cm left and right sides thickness, perhaps also can adopt when using the so-called spiral membrane of the envelope shape that is wound into the web-like use under the state of being furnished with fids such as net in inside etc.
Among Fig. 1 13 by the side space in the internal space of above-mentioned reverse osmosis membrane 12 membrane separation assemblies 1 divided into two parts, promptly supplies with hydroecium.The 14th, the opposing party space in the space that is divided into two parts promptly sees through hydroecium.
In above-mentioned supply hydroecium 13 sides of above-mentioned housing 11, be provided with the concentrated stream that makes former water flow into the former flow inlet of usefulness and make concentrated stream go out usefulness and export.In above-mentioned hydroecium 14 sides that see through, be provided with to make and passed through reverse osmosis membrane 12 and treating water that salt concn has reduced is discharged the treating water relief outlet of usefulness.
Among Fig. 12 is the former water transport mechanisms that are provided with in order to make former water (draining) flow into above-mentioned membrane separation assemblies 1.The 21st, as the former water pipe arrangement portion on the through-flow road of former current.
This former water pipe arrangement portion 21, one is distolateral to be connected with the feed point (figure does not show) of former water.In addition, flow into above-mentioned supply hydroecium 13 in order to make the former water from this feed point, the other end of this former water pipe arrangement portion 21 is connected with the former flow inlet on the housing 11 that is formed on above-mentioned membrane separation assemblies 1.
The 22nd, that transports that former water uses transports pump (below be also referred to as " former water transport pump ").This former water transport pump 22 is located at position in the way of above-mentioned former water pipe arrangement portion 21, makes former water flow to above-mentioned membrane separation assemblies 1 from above-mentioned former water supply point.
Among Fig. 13 is for having been removed the treating water of salt by above-mentioned membrane separation assemblies 1, supplies to the use point (figure does not show) of this treating water and the treating water conveyer that is provided with.The 31st, as the treating water pipe arrangement portion for the treatment of water circulation stream.
This treating water pipe arrangement portion 31 discharges from the above-mentioned hydroecium 14 that sees through in order to make treating water, and one permeate water relief outlet distolateral and on the housing 11 that is formed on above-mentioned membrane separation assemblies 1 is connected.
The 32nd, for the output for the treatment of water being controlled to be a certain amount of and be located at the treating water quantification mechanism of above-mentioned treating water pipe arrangement portion 31.This treating water quantification mechanism 32 for example can be to use the mechanism of constant flow rate valve etc.This constant flow rate valve for example can adopt following type etc.: have the aperture at the inlet side of valve, produce pressure reduction before and after aperture, regulate the main valve aperture, flow is remained necessarily by this pressure reduction because of the change of flow.
The 33rd, the impurity level determinator.Specifically, be that the salt concn that is used to be determined at the salt concn of the treating water of circulation in this treating water pipe arrangement portion 31 is measured mechanism.The salt concn of the 1st embodiment is measured mechanism 33, can send the measurement result that obtains as signal.
This salt concn is measured mechanism 33, can have the Conductivity Meters of measuring salt concn, ionometer etc.
In addition, electric conductivity has correlationship with salt concn, also can easily measure.Consider from this point, measure mechanism 33, preferably have the mechanism that measures electric conductivity as above-mentioned salt concn.
And because the Conductivity Meters price is low, it is also easy to safeguard, so the salt concn that has Conductivity Meters is measured mechanism 33, helps reducing installation cost, the maintenance cost of water treatment device.
Among Fig. 14 is for the dense water transport mechanism of the setting discharge system outside from above-mentioned membrane separation assemblies 1 of the dense water after salt concn is concentrated.The 41st, as the dense water pipe arrangement portion on the through-flow road of concentrated stream.
This dense water pipe arrangement portion 41, for dense water is discharged from above-mentioned supply hydroecium 13, one distolateral with the housing 11 that is formed on above-mentioned membrane separation assemblies 1 on concentrated water drainage export and be connected.
The 42nd, in order to regulate the dense water yield regulating mechanism that is provided with from the membrane separation assemblies 1 effusive dense water yield.At this dense water yield regulating mechanism 42, employing butterfly valve etc. can be regulated the degree adjustment valve of aperture, according to measuring the signal that mechanism 33 sends from above-mentioned salt concn, makes from the membrane separation assemblies 1 effusive dense water yield to change.
Among Fig. 15, the expression signal transmission mechanism.This signal transmission mechanism 5 measuring the signal that mechanism 33 sends from above-mentioned salt concn, for example as the control signal of the aperture that changes degree adjustment valve, passes to above-mentioned dense water yield regulating mechanism 42.
As mentioned above, in the water treatment device of the 1st embodiment, be provided with treating water quantification mechanism 32, this treating water quantification mechanism 32 is as the discharge for the treatment of water is controlled to be certain controlling organization.So, control the dense water yield regulating mechanism 42 of the flow of dense water, the controlling organization that flows into the former water influx of membrane separation assemblies 1 as control works.
In addition, this controls the dense water yield regulating mechanism 42 of former water influx, measure mechanism 33 and the signal of measuring the measured value of mechanism 33 based on this salt concn is passed to the signal transmission mechanism 5 of dense water yield regulating mechanism 42 by salt concn, can control the influx of former water according to the amount of the salt that sees through reverse osmosis membrane 12.
Hereinafter will describe the amount according to the salt that sees through this reverse osmosis membrane 12 in detail, control flows into the control method of the former water influx of membrane separation assemblies 1.
In addition, under the prerequisite that does not influence effect of the present invention, in the above-mentioned water treatment device, also can adopt the various device classes that adopt in the known before water treatment device.Its explanation is omitted.
Below, illustrate and use this water treatment device, draining can be utilized and the water treatment method implemented as process water again.
Above-mentioned draining, for example it contains the degree of salt, is that electric conductivity is thousands of μ S/cm to one more than ten thousand thousand μ S/cm.In the 1st embodiment, make this draining become electric conductivity be 1000 μ S/cm following, the soft water state of hundreds of μ S/cm for example, can be used as the general industrial water and utilize again.
In addition, in the water treatment of the 1st embodiment, the higher limit of the electric conductivity for the treatment of water for example can be set at the arbitrary value among 200 μ S/cm～300 μ S/cm, implement to handle.
Like this draining as former water, regeneration becomes the water treatment method of recycling process water (treating water), as implement followingly.
At first,, make former water transport pump 22 runnings of above-mentioned former water transport mechanism 2, attract former water (draining),, make draining flow into the supply hydroecium 13 of membrane separation assemblies 1 by former water pipe arrangement portion 21 from the feed point of former water with certain rotating speed.
At this moment, inside at the housing 11 of membrane separation assemblies 1, former water and reverse osmosis membrane 12 join, the main component of this former water is a moisture thus, see through reverse osmosis membrane 12, flow into and see through hydroecium, and in supplying with hydroecium 13, become the state of from initial former water, having got rid of moisture, formed the dense water that salt concn has risen.
Continuation is flowed into former water continuously by former water transport mechanism 2 and supplies with hydroecium 13, and the dense water that makes salt concn be higher than former water is full of supplies with hydroecium 13, and the treating water that salt concn is lower than former water is full of through hydroecium 14.
And then utilize former water transport mechanism 2 that former water is flowed into continuously and supply with hydroecium 13, make thus through the treating water of hydroecium 14 and discharge from the treating water relief outlet, be transported to the use point by treating water conveyer 3.
At this moment, implement control by the treating water quantification mechanism 32 that has adopted constant flow rate valve for example etc., making becomes certain flow from the flow that sees through hydroecium 14 effusive treating water of membrane separation assemblies 1.
On the other hand, by former water transport mechanism 2 former water is flowed into and to supply with hydroecium 13, thus the dense water of supplying with in the hydroecium 13 are extruded from the concentrated water drainage outlet, outside 4 discharge systems of dense water transport mechanism.
At this moment,, for example, regulate the aperture of butterfly valve,, be set at the amount that the amount that obtains than deduct above-mentioned treating water discharge from the former water yield of inflow is so far lacked the flow of the dense water outside the system of being discharged to by the dense water yield regulating mechanism 42 that has adopted butterfly valve etc.
Owing to the total amount of the flow of the flow for the treatment of water and dense water, be set at the former water influx that is less than hereto, so the hydraulic pressure of supplying with hydroecium 13 rises, the load of former water transport pump 22 increases slightly.
Along with this supplies with the rising of the hydraulic pressure of hydroecium 13 inside, the load of former water transport pump 22 increases, and former water flows into the amount of supplying with hydroecium 13 to be reduced, and the flow of the dense water by butterfly valve reduces slightly.
Then, the total amount of the flow for the treatment of water and the flow of dense water becomes identically with the influx of former water, reaches balance.
In addition, because treating water is controlled to be certain flow by constant flow rate valve etc., so, rise even supply with the hydraulic pressure of hydroecium 13, in order to resist the rising of this hydraulic pressure, the hydraulic pressure that see through in the hydroecium 14 rise the change that does not produce flow.
At this moment, with Conductivity Meters etc. measure the water quality for the treatment of water on one side, implement water treatment on one side, for example, when observing because of the salt concn rising of former water etc., when the salt concn for the treatment of water has risen, send the control signal that the aperture that makes above-mentioned butterfly valve strengthens.
Like this, increase by the flow that makes dense water, the hydraulic pressure of supplying with in the hydroecium 13 just reduces, and the load of former water transport pump 22 reduces, and the influx of former water also increases.
Then, increase, make the salt concn of supplying with hydroecium 13 reduce, the salt concn for the treatment of water is controlled at below the preset value by the influx that makes former water.
Below, the influx that describes in detail by making this former water changes, and the concentration of the salt for the treatment of water is controlled at method below the preset value.
Usually, if the kind of reverse osmosis membrane is certain, the amount of the moisture by reverse osmosis membrane within a certain period of time then is by its area, across adjacent spatial differential water pressures of reverse osmosis membrane (below be also referred to as " pressure reduction ") and water temperature decision.
On the other hand, pass through the amount of the salt of reverse osmosis membrane within a certain period of time, change according to the amount of the contained salt of dense water and the performance of reverse osmosis membrane usually.
In the 1st embodiment, because the discharge for the treatment of water is controlled as necessarily, so even flow into the salt concn rising of the former water of supplying with hydroecium 13, the amount of the moisture by reverse osmosis membrane also is certain within a certain period of time.
Therefore, when the influx of former water does not have the situation of variation, from a certain amount of former water, only remove a certain amount for the treatment of water, in supplying with hydroecium 13, form with to a certain degree spissated dense water.
In addition, the amount of the salt by reverse osmosis membrane is in a ratio of seldom amount with the amount of salt contained in the former water, and the major part of contained salt in the former water flows out from membrane separation assemblies 1 with dense water.
When the salt concn of the former water that flows into has risen, if flow into the amount of the former water of membrane separation assemblies 1, before rising with salt concn be that the salt concn of then supplying with hydroecium 13 also rises with amount, moves to amount increase through the salt of hydroecium 14 sides from supply hydroecium 13 sides by reverse osmosis membrane 12.
But, in the water treatment method of the 1st embodiment, when the salt concn of former water rises, moves to amount through the salt of hydroecium 14 sides when increasing, because the influx (concentrated stream output) of former water is increased, so, can suppress to move to amount increase through the salt of hydroecium 14 sides.
If the unit time influx of former water is V O, the unit time discharge for the treatment of water is V T, the unit time discharge of dense water is V C, the unit time discharge V of this dense water then C, can obtain by following formula (1).
[formula 1]
V C＝V O-V T…(1)
If this V OThe amount of the salt that contains in the former water of amount is C O, V TThe amount of the salt that contains in the treating water of amount is C T, V CThe amount of the salt that contains in the treating water of amount is C C, then because the amount of the salt that contains with former water is compared, the amount of the salt that contains in the treating water is few, is micro-(C O＞＞C T), so, V CThe amount C of the salt that contains in the dense water of amount C, shown in (2).
[formula 2]
C C≒C O …(2)
Therefore, the salt concn of establishing dense water is D C, then this salt concn is as shown in the formula shown in (3).
[formula 3]
D C≒C O/(V O-V T)…(3)
Here, in the water treatment method of the 1st embodiment, the amount (V for the treatment of water T) be made as necessarily.
Therefore, even the salt concn of former water rises, the amount (C of the salt that contains in the former water O) increase, by increasing the influx (V of former water O), can suppress the salt concn (D of dense water C) rising, the salt concn that can suppress to supply with hydroecium 13 sides rises.
Like this, can suppress to see through reverse osmosis membrane 12, move to amount increase through the salt of hydroecium 14.
In addition, the influx of former water that flow into to supply with hydroecium 13 sides has been changed after, see through reverse osmosis membrane 12 and move to amount through the salt of hydroecium 14, not necessarily to be adjusted to and identical value before the salt concn of former water rises.If necessary, in the 1st embodiment, the salt concn that also can make dense water is low before rising than the salt concn of former water, makes through reverse osmosis membrane 12 and moves to amount through the salt of hydroecium 14, and the state before rising than the salt concn of former water is low.
In addition in the salt concn for the treatment of water, higher limit than the scope that can be used as the service water use is much smaller, can allow when salt concn rises slightly, also can set former water influx in this wise, promptly, make to see through reverse osmosis membrane 12 and move to amount, increase before rising than the salt concn of former water through the salt of hydroecium 14.
As mentioned above, in the water treatment method of the 1st embodiment, water treatment device has controlling organization, and this controlling organization according to the amount of the salt that sees through reverse osmosis membrane 12, makes to flow into the former water inflow quantitative changeization of supplying with hydroecium 13 sides.Like this, can be controlled at the concentration of the salt of above-mentioned treating water below the preset value, implement water treatment by this controlling organization.
In addition, in the above-mentioned control, when the salt concn of former water has risen, the aperture of the degree adjustment valve of restriction concentrated stream amount strengthens, and the hydraulic pressure of supplying with hydroecium 13 reduces, along with the reduction of this hydraulic pressure, the hydraulic pressure that sees through in the hydroecium 14 also reduces, become state, reach balance, handle the water yield and be retained as necessarily with the pressure reduction that offsets with the treating water discharge.
In addition, reverse osmosis membrane, when temperature rose, salt saw through easily usually.Here describe in detail and be omitted.
Therefore, even under the situation that does not have to change in the salt concn of former water, also can influence the water quality for the treatment of water sometimes because of the temperature variation of former water.
At this moment also with similarly above-mentioned, the discharge for the treatment of water is controlled to be necessarily, and, make to flow into the former water of supplying with hydroecium 13 and flow into quantitative changeization, can be controlled at the concentration of the salt for the treatment of water below the preset value thus.
In addition, illustrated above when the salt concn of former water has risen, made the salt concn for the treatment of water become the following control of preset value, but, for example, also can be this preset value as higher limit, lower value is set in addition, treating water is controlled in the predetermined salt concn scope.
That is, in the 1st embodiment, for example, also can implement control in this wise: promptly, amount according to the salt that sees through reverse osmosis membrane 12 is made the controlling organization that flows into the former water inflow quantitative changeization of supplying with hydroecium 13 sides, set the salt concn higher limit for the treatment of water, and preset lower limit.When the salt concn that predicts treating water surpasses higher limit, increase the influx of former water, when predicting the salt concn deficiency lower value for the treatment of water, reduce the influx of former water.
In addition, among the present invention, also can adopt various controls, equipment operation method in the known before water treatment method.Here describe in detail and be omitted.
For example, also can implement water treatment method with the such equipment of the schematic block diagram of Fig. 2 to Figure 10.
In the water treatment device shown in Figure 1, with certain rotating speed, make former water transport pump 22 runnings, measure the measurement result of mechanism 33 according to salt concn, implement the control of concentrated stream output by dense water yield regulating mechanism 42, make the quantitative changeization of former water that flow into to supply with hydroecium 13, the salt concn for the treatment of water is controlled at below the preset value.For this reason, for the signal that salt concn mensuration mechanism 33 is sent is delivered to dense water yield regulating mechanism 42, be provided with signal transmission mechanism 5.
On the other hand, in the water treatment device of Fig. 2, in dense water transport mechanism 4, dense water yield regulating mechanism is not set,, makes the rotation speed change of former water transport pump 22 according to the measurement result of salt concn mensuration mechanism 33, make the quantitative changeization that flows into the former water of supplying with hydroecium 13, for this reason, be provided with the umformer 51 of the rotation speed change that makes former water transport pump 22, signal transmission mechanism 5 is connected with this umformer 51.
Adopt the water treatment method of water treatment device shown in Figure 2, similarly implement in the time of also can be with water treatment device shown in Figure 1.
For example, when the salt concn of observing treating water has risen, make former water transport pump 22 with the running of high rotating speed ground, make the amount (" V in the above-mentioned formula (3) that flows into the former water of supplying with hydroecium 13 by umformer 51 O") increase, like this, can suppress to see through the amount that reverse osmosis membrane 12 moves to through the salt of hydroecium 14 sides and increase.
In addition, if necessary, can move to amount through the salt of hydroecium 14 sides so that see through reverse osmosis membrane 12, with respect to the amount increase and decrease that observes before the treating water salt concn rises, this point also is identical.
Adopt water treatment device shown in Figure 2, compare, can both suppress the hydraulic pressure change of membrane separation assemblies 1 inside, the inflow water yield of former water is changed, can avoid reverse osmosis membrane 12 damaged such troubles, implement water treatment with water treatment device shown in Figure 1.
Fig. 1, water treatment device shown in Figure 2, its salt concn is measured the salt concn that mechanism 33 is used to be determined at the treating water of circulation in the treating water pipe arrangement portion 31.But in the Fig. 3 that the following describes, the water treatment device shown in Figure 4, the salt concn that had is measured the salt concn that mechanism 33 is used to be determined at the former water of circulation in the former water pipe arrangement portion 21.This point is inequality.
Promptly, when the salt concn of former water side rises, usually, the salt concn of supplying with hydroecium 13 rises, and rises from supplying with the salt concn that hydroecium 13 penetrates into through the treating water of hydroecium 14, so, utilize dense water yield regulating mechanism 42, control is to the former water influx (situation of Fig. 3) of supplying with hydroecium 13, perhaps, utilize the rotating speed of the former water transport pump 22 of umformer 51 controls, with the former water influx (situation of Fig. 4) of control to supply hydroecium 13.
Adopt the water treatment device of this Fig. 3, Fig. 4, can avoid the salt concn for the treatment of water to increase in advance, keep the water quality for the treatment of water more effectively.
In addition, Fig. 5, water treatment device shown in Figure 6 have dense water and also flow mechanism 6.This dense water also flows mechanism 6, makes from supplying with the part of hydroecium 13 effusive dense water, also flows to than the former water pipe arrangement portion 21 of former water transport pump 22 by upstream side (former water supply point side).Fig. 5, water treatment device shown in Figure 6 have and constitute the pipe portion 61 of also banising that this dense water also flows mechanism 6, and this is also banishd pipe portion 61 former water pipe arrangement portion 21 and dense water pipe arrangement portion 41 are coupled together.Remaining structure is distinguished identical with Fig. 2, water treatment device shown in Figure 4.
In addition, also banising pipe portion 61, be provided with the dense water yield of stream also is controlled to be certain flowing water quantification mechanism 63 that goes back.
This goes back flowing water quantification mechanism 63, can adopt the constant flow rate valve of use in treating water quantification mechanism 32 etc.
This Fig. 5, water treatment device shown in Figure 6, the part of dense water and the mixed mixing water of former water flow into membrane separation assemblies 1 by former water pipe arrangement portion 21.So, if the operational situation of former water transport pump 22 is identical, then to compare with Fig. 2, water treatment device shown in Figure 4, the amount of the former water of taking from feed point reduces with the amount of the dense water of stream also to be measured accordingly.
In addition, the amount that is discharged to the dense water outside the system reduces.
Therefore, under the situation of the amount that is not easy fully to guarantee former water, the quantitative change of former water is moving violent, and when being difficult to guarantee stable running condition with Fig. 2, water treatment device shown in Figure 4 etc., at this moment, Fig. 5, water treatment device shown in Figure 6 are reasonable selections.
That is, implement water treatment, can make the running condition stabilization of equipment with Fig. 5, water treatment device shown in Figure 6.
In addition, in the time of must implementing the situation of some aftertreatments to dense water, can reduce the workload of this aftertreatment.
In the water treatment device of Fig. 5, Fig. 6, flow into the dense water of membrane separation assemblies 1 and the mixing water of former water, salt concn is than former water height, so, use the water treatment method of Fig. 5, water treatment device shown in Figure 6, be suitable for the lower situation of the salt concn of dense water or former water etc.
In addition, when implementing water treatment, can prevent in advance that the salt concn for the treatment of water from rising, keep the water quality for the treatment of water more effectively with water treatment device shown in Figure 6, aspect this point, identical with water treatment device enforcement water treatment shown in Figure 3 the time.
Fig. 7, water treatment device shown in Figure 8 have the pipe portion 61 of also banising that former water pipe arrangement portion 21 and dense water pipe arrangement portion 41 are coupled together.In Fig. 7, the water treatment device shown in Figure 8, have dense water and also flow mechanism 6.Wherein, also banish pipe portion 61, be connected with former water pipe arrangement portion 21 by upstream side (former water supply point side) than former water transport pump 22, a part, also flow to than the former water pipe arrangement portion 21 of former water transport pump 22 by upstream side (side is put in former water supply) from the supply hydroecium 13 effusive dense water of membrane separation assemblies 1.This point and Fig. 1, water treatment device shown in Figure 3 are inequality.
In addition, Fig. 7, water treatment device shown in Figure 8, than with also banish connecting portion that pipe portion 61 is connected by upstream side (with also banising between the connecting portion and membrane separation assemblies 1 that pipe portion 61 is connected), in dense water pipe arrangement portion 41, have dense water yield regulating mechanism 42, regulate from supplying with the discharge of the dense water that hydroecium 13 comes out, and, in this dense water yield regulating mechanism 42, adopt the discharge of the dense water that comes out from supply hydroecium 13 is controlled to be a certain amount of constant flow rate valve.This point and Fig. 1, water treatment device shown in Figure 3 are inequality.
In addition, Fig. 7, water treatment device shown in Figure 8, than with also banish connecting portion that pipe portion 61 is connected by the downstream side, in dense water pipe arrangement portion 41, have the output regulating mechanism 62 of regulating the amount that is discharged to the dense water outside the system, and, be provided with signal transmission mechanism 5, make it possible to measure the salt concn (situation of Fig. 7) of the treating water that mechanism 33 measures or according to the former water and the result of the salt concn (situation of Fig. 8) of the mixed mixing water of dense water of stream also, with output outside the system of the dense water of output regulating mechanism 62 controls according to salt concn.This point and Fig. 1, water treatment device shown in Figure 3 are inequality.
Use in the water treatment of Fig. 7, water treatment device shown in Figure 8 enforcement, owing to be provided with treating water quantification mechanism 32 and dense water yield regulating mechanism 42, make from the discharge that sees through the treating water that hydroecium 14 comes out and be a certain amount of from the discharge of supplying with the dense water that hydroecium 13 comes out, so the amount that flows into the mixing water of membrane separation assemblies 1 is a certain amount of.
This Fig. 7, water treatment device shown in Figure 8, have dense water and also flow mechanism 6, this point and Fig. 5, water treatment device shown in Figure 6 are identical, but, according to the salt concn for the treatment of water or the salt concn of mixing water, control is discharged to the amount this point of the dense water outside the system, and is inequality with Fig. 5, water treatment device shown in Figure 6.
Be discharged to the amount of the dense water outside the system, be controlled according to the salt concn for the treatment of water or the salt concn of mixing water, so, for example when salt concn is measured mechanism 33 and is measured to amount through the salt of reverse osmosis membrane 12 and has increased, can be by output regulating mechanism 62, concentrated water drainage output outside the system of being discharged to is increased, make, make the mixing Central Plains shared ratio of water increase by also banising the dense water yield minimizing that pipe portion 61 also flows.
That is,, mixing water is flowed into supply with hydroecium 13, like this, make the salt concn reduction of supplying with hydroecium 13 inside, the salt concn for the treatment of water can be controlled at below the preset value making the former water influx that flows into supply hydroecium 13 increase, reduce under the state of salt concn.
The water treatment of adopting Fig. 7, water treatment device shown in Figure 8 to implement can make the running condition stabilization of equipment, and the aftertreatment workload that can reduce dense water.In this respect, the water treatment of adopting Fig. 7, water treatment device shown in Figure 8 to implement, identical during with employing Fig. 5, water treatment device shown in Figure 6.
In addition, when implementing water treatment, can avoid the salt concn for the treatment of water to become more than the preset value in advance, can keep the water quality for the treatment of water more effectively with water treatment device shown in Figure 8.Aspect this point, adopt the water treatment of Fig. 7, water treatment device shown in Figure 8, identical with water treatment device enforcement water treatment shown in Figure 3 the time.
Fig. 9, water treatment device shown in Figure 10, with the something in common of Fig. 7, water treatment device shown in Figure 8 be, the first, with also banising pipe portion 61 dense water pipe arrangement portion 41 and former water pipe arrangement portion 21 are coupled together.The second, than with also banish connecting portion that pipe portion 61 is connected by the downstream side, in dense water pipe arrangement portion 41, have and regulate the output regulating mechanism 62 that is discharged to the dense water yield outside the system; And is furnished with signal transmission mechanism 5, make it possible to measure the salt concn of the treating water that mechanism 33 measures or former water and the result of the salt concn of the mixed mixing water of dense water of stream also, with output outside the system of the dense water of output regulating mechanism 62 controls according to salt concn.
In addition, Fig. 9, water treatment device shown in Figure 10, than with also banish position that pipe portion 61 is connected by upstream side, have the dense water yield regulating mechanism 42 that has adopted constant flow rate valve, this dense water yield regulating mechanism 42 is used for the discharge of dense water is controlled to be necessarily, and this point is also identical with Fig. 7, Fig. 8.
On the other hand, in the water treatment device shown in Fig. 7, Fig. 8 etc., be located at the treating water quantification mechanism 32 for the treatment of water pipe arrangement portion 31, it all is the example of constant flow rate valve etc., but, this Fig. 9, water treatment device shown in Figure 10, treating water quantification mechanism 32, have the under meter 32a that is located at treating water pipe arrangement portion 31, make the umformer 32b of rotation speed change of former water transport pump 22 and their control line 32c according to the measured value of this under meter 32a (below be also referred to as " treating water quantification control line 32c "), this point and Fig. 7, water treatment device shown in Figure 8 are inequality.
Promptly, this Fig. 9, water treatment device shown in Figure 10, can control the hydraulic pressure of supplying with hydroecium 13 inside, for example, produced dirt settling on because of reverse osmosis membrane or because of the temperature variation of the water that imports membrane separation assemblies, and the water permeability that causes reverse osmosis membrane can change can change the time according to this, make the hydraulic pressure change of the dense water of supplying with hydroecium 13 inside, obtain a certain amount for the treatment of water.
Therefore, use the water treatment method of Fig. 9, water treatment device shown in Figure 10, be suitable for handling making the big drainings of water quality change such as the amount that produces the composition of dirt settling on the reverse osmosis membrane, water temperature.
In addition, be not only example referring to figs. 1 through Figure 10 explanation, also can adopt various controls, equipment operation method in the known before water treatment method.
In addition, illustrated above the example of the cleaning draining of Metal smelting factory as the water treatment of former water, but, for example the water treatment of sea water desaltination etc. also within the scope of the invention, water treatment method and water treatment device with other embodiment, in sea water desaltination etc., the water that also can stably obtain having certain rank water quality.
[the 2nd embodiment]
Below, the purified water recovering apparatus as water treatment device is described.
Figure 11 is the sketch chart of the purified water recovering apparatus of expression the 2nd embodiment.
As shown in figure 11, the purified water recovering apparatus of the 2nd embodiment has the membrane separation assemblies as reverse osmosis membrane unit 101.This reverse osmosis membrane unit 101 utilizes reverse osmosis membrane to filter that to become treating water (100B promptly purifies waste water) and the non-permeate water that permeate water promptly purified be dense water 100C supplying with water sepn.
Specifically, the purified water recovering apparatus of the 2nd embodiment has respectively along a plurality of reverse osmosis membranes unit 101 that water (flow) direction is vertically connecting with arranging.In the purified water recovering apparatus of the 2nd embodiment, waste water 100A is as supplying with the reverse osmosis membrane unit 101 that water is fed into upstream side.The 101 dense water 100C that discharge from previous stage reverse osmosis membrane unit are fed into other reverse osmosis membrane unit 101 as supplying with water.The 100B that purifies waste water that discharges from each reverse osmosis membrane unit 101 is recovered.
In addition, the purified water recovering apparatus of the 2nd embodiment in the device of Figure 11, has the 1st reverse osmosis membrane unit 101a and the 2nd reverse osmosis membrane unit 101b.Waste water 100A is fed into the 1st reverse osmosis membrane unit 101a as supplying with water, and the 1st reverse osmosis membrane unit 101a is separated into purify waste water 100B and dense water 100C and discharge to waste water 100A.Dense water 100C from the 1st reverse osmosis membrane unit 101a discharges is fed into the 2nd reverse osmosis membrane unit 101b as supplying with water.In addition, the purified water recovering apparatus of the 2nd embodiment, both sides' the 100B that purifies waste water is recovered, and, from the dense water 100C that the 2nd reverse osmosis membrane unit 101b discharges, be shifted into outside the system or dense water storage tanks (figure does not show).
In the purified water recovering apparatus of the 2nd embodiment, have a plurality of pipe arrangements, formed a plurality of paths 104,105,106,107,108,109 of transferring purify waste water 100B or dense water 100C.
The purified water recovering apparatus of the 2nd embodiment, among these a plurality of paths 104,105,106,107,108,109, path 104,106, be respectively transfer from each reverse osmosis membrane unit 101 100B that purify waste water that discharge, transfer the path as purifying waste water for the treatment of water pipe arrangement portion.Path 105,107, be respectively transfer dense water 100C, transfer the path as the dense water of dense water pipe arrangement portion.Path 108 is the handover dilution paths of purifying waste water that supply to supply water (the normally dense water 100C of the previous stage) dilution of any one reverse osmosis membrane 101 with purify waste water 100B or waste water 100A to the major general.Path 109 is circuitous paths, and this circuitous path 109 is used for this supply water supply not being made it to reverse osmosis membrane unit 101 around transferring path 107 to the dense water of transferring the 101 dense water 100C that discharge from the reverse osmosis membrane unit.
The purified water recovering apparatus of the 2nd embodiment, for example, in the device of Figure 11, have the 1st and purify waste water and transfer path the 104, the 1st dense water and transfer path the 105, the 2nd and purify waste water and transfer path the 106, the 2nd dense water and transfer path 107, purify waste water and transfer dilution path 108 and circuitous path 109.The 1st purifies waste water transfers path 104, and 100B delivers to the storage tanks of purifying waste water (figure does not show) from the 1st reverse osmosis membrane unit 101a purifying waste water.The 1st dense water is transferred path 105, and dense water 100C is delivered to the 2nd reverse osmosis membrane unit 101b from the 1st reverse osmosis membrane unit 101a.The 2nd purifies waste water transfers path 106, and 100B delivers to the storage tanks of purifying waste water (figure does not show) from the 2nd reverse osmosis membrane unit 101b purifying waste water.The 2nd dense water is transferred path 107, delivers to dense water 100C outside the system or dense water storage tanks (figure does not show) from the 2nd reverse osmosis membrane unit 101b.Purify waste water and transfer dilution path 108, for the 100B that purifies waste water the dense water 100C dilution of discharging from the 1st reverse osmosis membrane unit 101a, purify waste water the 1st and to transfer path 104 and the 1st dense water and transfer path 105 and be communicated with.Circuitous path 109 does not supply to the 2nd reverse osmosis membrane unit 101b and around transfer path 107 to the 2nd dense water, the 1st dense water is transferred path 105 and the 2nd dense water handover path 107 connections in order to make the dense water 100C that discharges from the 1st reverse osmosis membrane unit 101a.
In addition, the purified water recovering apparatus of the 2nd embodiment has valve system.This valve system on each path 104,105,106,107,108,109, is installed valve as required, by the opening and closing operations of each valve, and decision flow, stream.
For example, the device of Figure 11 has valve system.This valve system, purify waste water the 1st and to transfer path the 104, the 2nd and purify waste water and transfer path the 106, the 1st dense water and transfer path the 105, the 2nd dense water and transfer path 107, purify waste water and transfer on dilution path 108 and the circuitous path 109, be installed with the 1st respectively and purify water valve 111a, the 2nd purification water valve 111b, the 1st dense water valve 112a as dense water yield regulating mechanism, the 2nd dense water valve 112b, purify waste water handover dilution path valve 113 and circuitous path valve 114 as dense water yield regulating mechanism, by the opening and closing operations of each valve, decision stream, flow.
In addition, the purified water recovering apparatus of the 2nd embodiment has any impurity level determinator 120 at least of supplying with among water impurity level determinator 120a, dense water impurity level determinator 120b and the impurity level determinator 120c that purifies waste water at least.Above-mentioned supply water impurity level determinator 120 is used to measure the impurity level to the supply water (the normally dense water 100C of previous stage) of an above-mentioned reverse osmosis membrane unit 101 supplies.Above-mentioned dense water impurity level determinator 120b is used for measuring the impurity level of the dense water 100C that discharges an above-mentioned reverse osmosis membrane unit 101.The above-mentioned impurity level determinator 120c that purifies waste water is used for measuring the impurity level of the 100B that purifies waste water that discharges an above-mentioned reverse osmosis membrane unit 101.
In addition, the purified water recovering apparatus of the 2nd embodiment, the measured value that is measured to when the impurity level device of impurity level determinator 120, for more than the benchmark value or when having surpassed benchmark value, promptly, for in the following situation at least during any situation: the measured value that above-mentioned supply water impurity level determinator 120a is measured to, for more than the benchmark value of supplying with water or when having surpassed benchmark value; The measured value that above-mentioned dense water impurity level determinator 120b is measured to is for more than the benchmark value of dense water or when having surpassed benchmark value; The measured value that the above-mentioned impurity level determinator 120c that purifies waste water is measured to, for more than the benchmark value of purifying waste water or when having surpassed benchmark value, implement above-mentioned purifying waste water and transfer 108 pairs in path of dilution and supply to the dilution of supply water of an above-mentioned reverse osmosis membrane unit 101 and circuitous (walking around) this two either party at least wherein of 109 pairs of above-mentioned reverse osmosis membrane unit 101 of above-mentioned circuitous path.
In addition, among Figure 11, have and supply with water impurity level determinator 120a, dense water impurity level determinator 120b and the impurity level determinator 120c that purifies waste water.Above-mentioned supply water impurity level determinator 120a is used to measure the impurity level of the supply water that supplies to the 2nd reverse osmosis membrane unit 101b.Above-mentioned dense water impurity level determinator 120b is used to measure the impurity level from the dense water of the 2nd reverse osmosis membrane unit 101b discharge.The above-mentioned impurity level determinator 120c that purifies waste water is used to measure the impurity level of purifying waste water of discharging from the 2nd reverse osmosis membrane unit 101b.
In addition, the purified water recovering apparatus of the 2nd embodiment, in Figure 11, the measured value that is measured to when the impurity level determinator of impurity level determinator 120, for more than the benchmark value or when having surpassed benchmark value, regulate the 1st and purify the open and-shut mode that water valve 111a, the 1st dense water valve 112a, the 2nd purify any valve at least among water valve 111b and the 2nd dense water valve 112b.
Above-mentioned impurity level determinator 120 can exemplify out the device of mensuration electric conductivity, ionic concn, salt concn, TDS (total dissolved matter concentration), pH or ORP (redox potential) etc.
As the level of control of reverse osmosis membrane handling property, electric conductivity normally considers that from the simplicity of the maintenance management of determinator, the aspects such as easiness of mensuration above-mentioned impurity level determinator 120 is preferably measured the electric conductivity measuring apparatus of electric conductivity.
The 1st benchmark value is the cut off value (boundary value) that determines whether to implement the either party at least in above-mentioned the purify waste water dilution of transferring dilution path 108 and above-mentioned circuitous path 109 circuitous.From the viewpoint of the 100B that purifies waste water that obtains predetermined above purity or from suppressing to decide the 1st benchmark value attached to the viewpoint of the scale on the reverse osmosis membrane.
For example, adopt under the situation of electric conductivity as the impurity level index, supply with water 80% or more when purifying waste water recovery, the benchmark value of the electric conductivity of dense water preferably is set in the scope below 5, the 000 μ S/cm.The benchmark value of the electric conductivity of purifying waste water preferably is set in the following scope of 1,000 μ S/cm.In addition, for example obtain the tap water level other when purifying waste water, the benchmark value of the electric conductivity of purifying waste water preferably is set in the following scope of 100 μ S/cm.
If in this scope, can obtain the sufficiently high 100B of purifying waste water of purity, simultaneously, also reduce attached to the scale amount on the reverse osmosis membrane.
In the 2nd embodiment, the waste water 100A to using is not particularly limited, and can be waste water, sanitary wastewater, rubbish water seepage of factories such as iron and steel, food, electric power, electronics, medicine, automobile etc.
The structure of the purified water recovering apparatus of the 2nd embodiment has been described above, below, the water treatment method that uses this purified water recovering apparatus, the recovery method of promptly purifying waste water are described.
The recovery method of purifying waste water of the 2nd embodiment has following operation when turning round usually.Promptly, waste water 100A as supplying with water, supply to the reverse osmosis membrane unit 101 of upstream side, in this reverse osmosis membrane unit 101, waste water 100A is separated into purify waste water 100B and dense water 100C, the 100B that purifies waste water is transferred path 104 by purifying waste water be transplanted on the storage tanks of purifying waste water, dense water 100C as supplying with water, supply to the reverse osmosis membrane unit 101 of next stage successively, the 100B that purifies waste water discharging from the reverse osmosis membrane unit 101 in successively downstream side transfers path 106 by purifying waste water, and is transplanted on the storage tanks of purifying waste water and reclaims, dense water 100C discharging from the reverse osmosis membrane unit 101 in downstream side is transplanted on outside the system or dense water storage tanks.
In addition, when using the device of Figure 11, the recovery method of purifying waste water of the 2nd embodiment has following operation.That is, waste water 100A is supplied to the 1st reverse osmosis membrane unit 101a, the 100B that purifies waste water that discharges from the 1st reverse osmosis membrane unit 101a is transplanted on the storage tanks of purifying waste water, dense water 100C is supplied to the 2nd reverse osmosis membrane unit 101b.In addition, the 100B that purifies waste water that discharges from the 2nd reverse osmosis membrane unit 101b is transplanted on the storage tanks of purifying waste water, is transplanted on dense water 100C outside the system or dense water storage tanks.
The recovery method of purifying waste water of the 2nd embodiment when so common running, has termly or measures constantly in following three kinds of impurity levels the operation of any impurity level at least.That is, supply to the impurity level of the supply water of any reverse osmosis membrane unit 101 (being the dense water 100C that discharges from the 1st reverse osmosis membrane unit 101a) at least in Figure 11 by supplying with water impurity level determinator 120a mensuration; Measure the impurity level of dense water (being the dense water 100C that discharges from the 2nd reverse osmosis membrane unit 101b) among Figure 11 from any reverse osmosis membrane unit 101 discharge at least by dense water impurity level determinator 120b; And the impurity level of measuring purify waste water (being the 100B that purifies waste water that discharges from the 2nd reverse osmosis membrane unit 101b) of discharging by the impurity level determinator 120c that purifies waste water among Figure 11 from any reverse osmosis membrane unit 101 at least.
In addition, the recovery method of purifying waste water of the 2nd embodiment has more than measured value is the 1st benchmark value or when having surpassed the 1st benchmark value, implement the to purify waste water dilution of transferring path 108 and circuitous path 109 circuitous either party's operation at least among the two.
For example, when using the device of Figure 11, the recovery method of purifying waste water of the 2nd embodiment has following operation.That is, as shown in figure 12, the handover dilution path valve 113 of will purifying waste water is opened, and transfers dilution path 108 from purifying waste water and transfers the 100B that purifies waste water, and dense water 100C is diluted to predetermined degree.Perhaps, as shown in figure 13, circuitous path valve 114 is opened, made dense water 100C circuitous by circuitous path 109.Perhaps, as shown in figure 14, the handover dilution path valve 113 of will purifying waste water is opened, transfer dilution path 108 from purifying waste water and transfer the 100B that purifies waste water, dense water 100C is diluted to predetermined degree, and, circuitous path valve 114 is opened, made dense water 100C circuitous by circuitous path 109.
In addition, the recovery method of purifying waste water of the 2nd embodiment, as required, have: more than measured value is the 2nd benchmark value or when having surpassed the 2nd benchmark value, for example under the situation of using device shown in Figure 11, regulate the 1st and purify the operation that water valve 111a, the 1st dense water valve 112a, the 2nd purify any valve at least among water valve 111b, the 2nd dense water valve 112b.
The recovery method of purifying waste water of the 2nd embodiment by aforesaid operations, can suppress reverse osmosis membrane unit 101 interior over-drastic and concentrate, and suppresses scale and is attached on the film.
[the 3rd embodiment]
Below, the purified water recovering apparatus of the 3rd embodiment and the recovery method of purifying waste water are described.
Here, omitted and the explanation of the 2nd embodiment multiple, the title of each one and Reference numeral are suitably quoted title and the Reference numeral in the 2nd embodiment.In the 3rd embodiment, there is not the content of special instruction, identical with the content that illustrates in the 2nd embodiment.
Figure 15 is the sketch chart of the purified water recovering apparatus of expression the 3rd embodiment.
As shown in figure 15, the purified water recovering apparatus of the 3rd embodiment has reverse osmosis membrane unit 101, and this reverse osmosis membrane unit 101 filters with reverse osmosis membrane and is separated into permeate water and as the dense water 100C of non-permeate water supplying with water conservancy.
Specifically, the purified water recovering apparatus of the 3rd embodiment has separately along a plurality of reverse osmosis membranes unit 101 that water (flow) direction is vertically connecting with arranging.In addition, in the purified water recovering apparatus of the 3rd embodiment, waste water 100A is as supplying with the reverse osmosis membrane unit 101 that water is fed into upstream side, the permeate water of discharging from the reverse osmosis membrane unit 101 of a prime, be fed into other reverse osmosis membrane unit 101 as supplying with water, the permeate water of discharging from any reverse osmosis membrane unit 101 at least is recovered as purifying waste water.
In addition, the device of Figure 15 has the 1st reverse osmosis membrane unit 101a and the 2nd reverse osmosis membrane unit 101b.Waste water 100A is fed into the 1st reverse osmosis membrane unit 101a as supplying with water, and the 1st reverse osmosis membrane unit 101a is separated into permeate water and dense water 100C to waste water 100A and discharges.Permeate water from the 1st reverse osmosis membrane unit 101a discharges is fed into the 2nd reverse osmosis membrane unit 101b as supplying with water.In addition, in the device of Figure 15, from the permeate water of the 2nd reverse osmosis membrane unit 101b discharge, 100B is recovered as purifying waste water, and,, be shifted into outside the system or dense water storage tanks (figure does not show) from the dense water 100C of the 1st reverse osmosis membrane unit 101a and the 2nd reverse osmosis membrane unit 101b discharge.
In the purified water recovering apparatus of the 3rd embodiment, have a plurality of pipe arrangements.In addition, the purified water recovering apparatus of the 3rd embodiment has permeate water and transfers path 130, permeate water handover dilution path 132 and dense water handover dilution path 134.Above-mentioned permeate water is transferred path 130, and the permeate water discharging from each reverse osmosis membrane unit 101 is transplanted on next stage reverse osmosis membrane unit 101.Above-mentioned permeate water is transferred dilution path 132, transfers the permeate water of coming out from any reverse osmosis membrane unit 101 at least, with the supply water dilution of this permeate water upstream side.Above-mentioned dense water is transferred dilution path 134, transfers the dense water 100C that comes out from any reverse osmosis membrane unit 101 at least, and the supply water of this dense water 100C upstream side is diluted.
For example, the device of Figure 15 has the 1st permeate water and transfers path 130a, the 2nd permeate water handover path 130b, permeate water handover dilution path 132 and dense water handover dilution path 134.Above-mentioned the 1st permeate water is transferred path 130a, and the permeate water discharging from the 1st reverse osmosis membrane unit 101a is transplanted on the 2nd reverse osmosis membrane unit 101b.Above-mentioned the 2nd permeate water is transferred path 130b, the permeate water of discharging from the 2nd reverse osmosis membrane unit 101b, is transplanted on the storage tanks of purifying waste water (figure does not show) as purifying waste water.Above-mentioned permeate water is transferred dilution path 132, transfers the permeate water of coming out from the 2nd reverse osmosis membrane unit 101b, with the supply water dilution of the 1st reverse osmosis membrane unit 101a.Above-mentioned dense water is transferred dilution path 134, transfers the dense water 100C that comes out from the 2nd reverse osmosis membrane unit 101b, and the supply water of the 1st reverse osmosis membrane unit 101a is diluted.
In addition, the purified water recovering apparatus of the 3rd embodiment has valve system, on each path, valve is housed as required, by the opening and closing operations of each valve, and decision stream, flow.
For example, in the device of Figure 15, transfer path the 105, the 2nd dense water at the 1st dense water and transfer path the 107, the 1st permeate water and transfer path 130a, the 2nd permeate water and transfer that path 130b, permeate water transfer dilution path 132, dense water is transferred on the dilution path 134, the 1st dense water valve 112c, the 2nd dense water valve 112b, the 1st have been installed have respectively seen through water valve 131a, the 2nd and see through that water valve 131b, permeate water transfer dilution path valve 133, dense water is transferred dilution path valve 135.The device of Figure 15 has the valve system that determines stream, flow by the opening and closing operations of each valve.
In addition, the purified water recovering apparatus of the 3rd embodiment has and supplies with among water impurity level determinator 120d, dense water impurity level determinator 120b and the permeate water impurity level determinator 120c any impurity level determinator 120 at least.Above-mentioned supply water impurity level determinator 120d is used for being determined at an above-mentioned reverse osmosis membrane unit 101, the impurity level of the supply water of supply (the normally permeate water of previous stage).Above-mentioned dense water impurity level determinator 120b is used for being determined at an above-mentioned reverse osmosis membrane unit 101, the impurity level of the dense water 100C of discharge.Above-mentioned permeate water impurity level determinator 120c is used for being determined at an above-mentioned reverse osmosis membrane unit 101, the impurity level of the permeate water of discharge.
In addition, the purified water recovering apparatus of the 3rd embodiment, the measured value that is measured to when the impurity level determinator of this impurity level determinator 120, for more than the benchmark value or when having surpassed benchmark value, promptly, be any situation at least in the following situation: above-mentioned supply water impurity level is measured the measured value that 120d is measured to, for more than the benchmark value of supplying with water or when having surpassed benchmark value; The measured value that above-mentioned dense water impurity level determinator 120b is measured to is for more than the benchmark value of dense water or when having surpassed benchmark value; And the measured value that is measured to of the above-mentioned impurity level determinator 120c that purifies waste water, for more than the benchmark value of purifying waste water or when having surpassed benchmark value, the either party at least who is transferred dilution path 132 and dense water handover path 134 by permeate water dilutes the path, and the supply water of an above-mentioned reverse osmosis membrane unit 101 is implemented dilution.
In addition, among Figure 15, have and supply with water impurity level determinator 120d, dense water impurity level determinator 120b and the impurity level determinator 120c that purifies waste water.Above-mentioned supply water impurity level determinator 120d is used to measure the impurity level of the supply water that supplies to the 2nd reverse osmosis membrane unit 101b.Above-mentioned dense water impurity level determinator 120b is used to measure the impurity level from the dense water of the 2nd reverse osmosis membrane unit 101b discharge.The above-mentioned impurity level determinator 120c that purifies waste water is used to measure the impurity level of purifying waste water of discharging from the 2nd reverse osmosis membrane unit 101b.
In addition, among Figure 15, the measured value that is measured to when the impurity level determinator of impurity level determinator 120, be that the 2nd benchmark value is above or when having surpassed the 2nd benchmark value, regulate the 1st and see through the open and-shut mode that water valve 131a, the 1st dense water valve 112c, the 2nd see through any valve at least among water valve 131b and the 2nd dense water valve 112b.
The 1st benchmark value is to determine whether transfer the cut off value that at least one side who dilutes path 132 and above-mentioned dense water handover dilution path 134 implements dilution with above-mentioned permeate water.From the viewpoint of the 100B that purifies waste water that obtains predetermined above purity or from suppressing to be attached to the viewpoint of the scale on the reverse osmosis membrane, determine the 1st benchmark value.
The structure of the water purification retrieving arrangement of the 3rd embodiment has been described above, below, the recovery method of purifying waste water of the 3rd embodiment that uses this purified water recovering apparatus is described.
The recovery method of purifying waste water of the 3rd embodiment has following operation when turning round usually.Promptly, waste water 100A as supplying with water, supply to the reverse osmosis membrane unit 101 of upstream side, in this reverse osmosis membrane unit 101, waste water 100A is separated into permeate water and dense water 100C, dense water is transferred path 105 by dense water, 107 are transplanted on outside the system or dense water storage tanks, permeate water as supplying with water, transfer path 130 by permeate water and supply to successively next stage reverse osmosis membrane unit 101, the permeate water of discharging from the reverse osmosis membrane unit 101 in downstream side successively, as the 100B that purifies waste water, transfer path 130 and purify waste water and transfer path 104 by permeate water, be transplanted on and purify waste water storage tanks and reclaim.
In addition, when using the device of Figure 11, the recovery method of purifying waste water of the 3rd embodiment has following operation.Promptly, waste water 100A is supplied to the 1st reverse osmosis membrane unit 101a, the permeate water of discharging from the 1st reverse osmosis membrane unit 101a, supply to the 2nd reverse osmosis membrane unit 101b, the permeate water of discharging from the 2nd reverse osmosis membrane unit 101b, be transplanted on the storage tanks of purifying waste water as the 100B that purifies waste water,, be transplanted on outside the system or dense water storage tanks from the dense water 100C of the 1st reverse osmosis membrane unit 101a discharge and the dense water 100C that discharges from the 2nd reverse osmosis membrane unit 101b.
The recovery method of purifying waste water of the 3rd embodiment when so common running, has termly or measures constantly in following three kinds of impurity levels the operation of any impurity level at least.That is, supply to the impurity level of the supply water of any reverse osmosis membrane unit 101 (being the permeate water of discharging) at least in Figure 15 from the 1st reverse osmosis membrane unit 101a by supplying with water impurity level determinator 120d mensuration; Measure the impurity level of dense water (being the dense water 100C that discharges from the 2nd reverse osmosis membrane unit 101b) among Figure 15 from any reverse osmosis membrane unit 101 discharge at least by dense water impurity level determinator 120b; And the impurity level of measuring permeate water (being the permeate water of discharging) by the impurity level determinator 120c that purifies waste water among Figure 15 from the 2nd reverse osmosis membrane unit 101b from any reverse osmosis membrane unit 101 discharge at least.
In addition, the recovery method of purifying waste water of the 3rd embodiment has more than measured value is the 1st benchmark value or when having surpassed the 1st benchmark value, transfers dilution path 132 and dense water is transferred the operation that the either party at least in the dilution path 134 implements to dilute with permeate water.
For example, when using the device of Figure 15, the recovery method of purifying waste water of the 3rd embodiment has following operation.That is, as shown in figure 16, permeate water is transferred dilution path valve 133 open, transfer dilution path 132 from permeate water and transfer permeate water, waste water 100A is diluted to the operation of predetermined degree; As shown in figure 17, dense water is transferred dilution path valve 135 open, transfer dilution path 134 from dense water and transfer dense water, waste water 100A is diluted to the operation of predetermined degree; Perhaps, as shown in figure 18, permeate water is transferred dilution path valve 133 open, transfer dilution path 132 from permeate water and transfer permeate water, and dense water is transferred dilution path valve 135 open, transfer dilution path valve 134 from dense water and transfer dense water, waste water 100A is diluted to the operation of predetermined degree.
In addition, the recovery method of purifying waste water of the 3rd embodiment, as required, possess: more than measured value is the 2nd benchmark value or when having surpassed the 2nd benchmark value, for example under the situation of using device shown in Figure 15, regulate the 1st and see through the operation that water valve 131a, the 1st dense water valve 112c, the 2nd see through any valve at least among water valve 131b, the 2nd dense water valve 112b.
The recovery method of purifying waste water of the 3rd embodiment by aforesaid operations, can suppress reverse osmosis membrane unit 101 interior over-drastic and concentrate, and also can suppress scale and be attached on the film.
[the 4th embodiment]
Below, the purified water recovering apparatus of the 4th embodiment is described.
Figure 19 is the sketch chart of the purified water recovering apparatus of expression the 4th embodiment.
As shown in figure 19, the purified water recovering apparatus of the 4th embodiment has a reverse osmosis membrane unit 201.This reverse osmosis membrane unit 201 is dense water 200C supplying with that water conservancy filters with reverse osmosis membrane and be separated into promptly purify waste water 200B and non-permeate water of permeate water.
In the device of Figure 19, the purified water recovering apparatus of the 4th embodiment has reverse osmosis membrane unit 201.Waste water 200A is fed into reverse osmosis membrane unit 201 as supplying with water, and this reverse osmosis membrane unit 201 is separated into purify waste water 200B and dense water 200C discharge to waste water 200A.In addition, in the purified water recovering apparatus of the 4th embodiment, the 200B that purifies waste water is recovered, and dense water 200C is shifted into outside the system or dense water storage tanks (figure does not show).
The purified water recovering apparatus of the 4th embodiment is formed with and transfers the dense water handover path 203 that purifying waste water of the 200B that purifies waste water transferred path 202 and transferred dense water 200C.
The purified water recovering apparatus of the 4th embodiment has valve system, and this valve system includes the purification water valve 211 of the flow of regulating the 200B that purifies waste water and regulates the dense water valve 212 of the flow of dense water 200C.By the opening and closing operations of each valve, the decision flow.
In addition, the device of Figure 19 has valve system, and this valve system has and being installed in the handover path 202 of purifying waste water respectively, dense water is transferred purification water valve 211 and dense water valve 212 on the path 203.By the opening and closing operations of each valve, the decision flow.
In addition, the purified water recovering apparatus of the 4th embodiment has impurity level determinator 220.This impurity level determinator 220, be supply with water impurity level determinator 220a1, supply with water impurity level determinator 220b1 and supply with among the water impurity level determinator 220c1 at least any.Above-mentioned supply water impurity level determinator 220a1 is used to measure the impurity level as the supply water of waste water.Above-mentioned supply water impurity level determinator 220b1 is used to measure the impurity level of dense water.Above-mentioned supply water impurity level determinator 220c1 is used to measure the impurity level of purifying waste water.
In addition, the purified water recovering apparatus of the 4th embodiment, the measured value that is measured to when the impurity level determinator of this impurity level determinator 220, for more than the benchmark value or when having surpassed benchmark value, promptly, be following any situation at least: the measured value that is measured to as above-mentioned supply water impurity level determinator 220a1, for more than the benchmark value of supplying with water or when having surpassed benchmark value, the measured value that above-mentioned dense water impurity level determinator 220b1 is measured to is for more than the benchmark value of dense water or when having surpassed benchmark value; And the measured value that is measured to of the above-mentioned impurity level determinator 220c1 that purifies waste water, for more than the benchmark value of purifying waste water or when having surpassed benchmark value, (when not enough benchmark value or benchmark value are following) is low when being controlled to be the transmitance in the above-mentioned reverse osmosis membrane unit than common running with valve system, this valve system utilizes the either party's at least who purifies water valve 211 and dense water valve 212 valve to regulate flow.
Impurity level determinator 220 can be a device etc. of measuring electric conductivity, ionic concn, salt concn, TDS (total dissolved matter concentration), pH or ORP (redox potential).
As the level of control of reverse osmosis membrane handling property, electric conductivity normally considers that from the simplicity of the maintenance management of determinator, the aspects such as easiness of mensuration impurity level determinator 220 is preferably measured the electric conductivity measuring apparatus of electric conductivity.
The valve system utilization purify water valve 211 and dense water valve 212 in the two at least either party's valve regulate flow.The 1st benchmark value is a cut off value low when whether determining to make transmitance in the above-mentioned reverse osmosis membrane unit than running usually with this valve system.From the viewpoint of the 200B that purifies waste water that obtains predetermined above purity or from suppressing to be attached to the viewpoint of the scale on the reverse osmosis membrane, determine the 1st benchmark value.
For example, adopt under the situation of electric conductivity as the impurity level index, supply with water 80% or more when purifying waste water recovery, the benchmark value of the electric conductivity of dense water, preferably be set in the following scope of 5,000 μ S/cm, the benchmark value of the electric conductivity of purifying waste water, preferably be set in the following scope of 1,000 μ S/cm.In addition, for obtain the tap water level other when purifying waste water, the benchmark value of the electric conductivity of purifying waste water preferably is set in the following scope of 100 μ S/cm.
If in this scope, can obtain the sufficiently high 200B of purifying waste water of purity, simultaneously, the scale amount that is attached on the reverse osmosis membrane also reduces.
Waste water 200A for using is not particularly limited, and can be waste water, sanitary wastewater, rubbish water seepage of factories such as iron and steel, food, electric power, electronics, medicine, automobile etc.
The structure of the purified water recovering apparatus of the 4th embodiment has been described above, below, the recovery method of purifying waste water of the 4th embodiment that uses this purified water recovering apparatus is described.
The recovery method of purifying waste water of the 4th embodiment has following operation when turning round usually.Promptly, waste water 200A as supplying with water, supply to reverse osmosis membrane unit 201, in this reverse osmosis membrane unit 201, waste water 200A is separated into purify waste water 200B and dense water 200C, the 200B that purifies waste water is transferred path 202 by purifying waste water be transplanted on the storage tanks of purifying waste water, be transplanted on dense water 200C outside the system or dense water storage tanks.
The recovery method of purifying waste water of the 4th embodiment at this usually during running, has termly or measures constantly in following three kinds of impurity levels the operation of any impurity level at least.That is, by supplying with the impurity level that water impurity level determinator 220a1 measures the supply water (waste water 200A) that supplies to reverse osmosis membrane unit 201; Measure the impurity level of the 201 dense water of discharging from the reverse osmosis membrane unit by dense water impurity level determinator 220b1; And the impurity levels of purifying waste water of measuring 201 discharges by the impurity level determinator 220c1 that purifies waste water from the reverse osmosis membrane unit.
In addition, the recovery method of purifying waste water of the 4th embodiment has following operation.That is, more than measured value is the 1st benchmark value or when having surpassed the 1st benchmark value, purify in water valve 211 and the dense water valve 212 valve system of either party's valve regulation flow at least by utilizing, low when being controlled to be the transmitance in the reverse osmosis membrane unit 201 than common running.
[the 5th embodiment]
Below, the purified water recovering apparatus of the 5th embodiment is described.
Here, omitted and the explanation of the 4th embodiment multiple, the title of each one and Reference numeral are quoted title and the Reference numeral in the 4th embodiment.In the 5th embodiment, there is not the content of special instruction, identical with the content that illustrates in the 4th embodiment.
Figure 20 is the sketch chart of the purified water recovering apparatus of expression the 5th embodiment.
As shown in figure 20, the purified water recovering apparatus of the 5th embodiment has separately along a plurality of reverse osmosis membranes unit 201 that water (flow) direction is vertically connecting with arranging.In addition, in the purified water recovering apparatus of the 5th embodiment, waste water 200A is as supplying with the reverse osmosis membrane unit 201 that water is fed into upstream side, the dense water 200C that discharges from the reverse osmosis membrane unit 201 of a prime, be fed into other reverse osmosis membrane unit 201 as supplying with water, the 200B that purifies waste water from discharge each reverse osmosis membrane unit 201 is recovered.
In the device of Figure 20, the purified water recovering apparatus of the 5th embodiment has the 1st reverse osmosis membrane unit 201a and the 2nd reverse osmosis membrane unit 201b.Waste water 200A is fed into the 1st reverse osmosis membrane unit 201a as supplying with water, and the 1st reverse osmosis membrane unit 201a is separated into purify waste water 200B and dense water 200C and discharge to waste water 200A.Dense water 200C from the 1st reverse osmosis membrane unit 201a discharges is fed into the 2nd reverse osmosis membrane unit 201b as supplying with water.In addition, in the purified water recovering apparatus of the 5th embodiment, both sides' the 200B that purifies waste water is recovered, and, from the dense water 200C that the 2nd reverse osmosis membrane unit 201b discharges, be shifted into outside the system or dense water storage tanks (figure does not show).
The purified water recovering apparatus of the 5th embodiment is formed with a plurality of paths 204,205,206,207 of transferring purify waste water 200B or dense water 200C.
In the purified water recovering apparatus of the 5th embodiment, among these a plurality of paths 204,205,206,207, path 204,206 is respectively the handover path of purifying waste water of transferring 201 200B that purify waste water that discharge from each reverse osmosis membrane unit.Path 205,207 is respectively that the dense water of transferring dense water 200C is transferred the path.
In addition, the purified water recovering apparatus of the 5th embodiment, having purifies waste water transfers dilution path 208 and circuitous path 209.Purify waste water handover with diluting path 208, and the supply water of any one reverse osmosis membrane unit 201 (the normally dense water 200C of previous stage) dilutes supplying at least with purify waste water 200B or waste water 200A as required.Circuitous path 209 as required, is not supplied with water supply to this to reverse osmosis membrane unit 101, and is made it around transferring path 207 to the dense water of transferring the 201 dense water 200C that discharge from the reverse osmosis membrane unit.
For example, the purified water recovering apparatus of the 5th embodiment, in the device of Figure 20, have the 1st and purify waste water and transfer path the 204, the 1st dense water and transfer path the 205, the 2nd and purify waste water and transfer path the 206, the 2nd dense water and transfer path 207, purify waste water and transfer dilution path 208 and circuitous path 209.The 1st purifies waste water transfers path 204, is used for the 200B that purifies waste water is delivered to the storage tanks of purifying waste water (figure does not show) from above-mentioned the 1st reverse osmosis membrane unit 201a.The 1st dense water is transferred path 205, is used for dense water 200C is delivered to the 2nd reverse osmosis membrane unit 201b from the 1st reverse osmosis membrane unit 201a.The 2nd purifies waste water transfers path 206, is used for the 200B that purifies waste water is delivered to the storage tanks of purifying waste water (figure does not show) from the 2nd reverse osmosis membrane unit 201b.The 2nd dense water is transferred path 207, is used for delivering to dense water 200C outside the system or dense water storage tanks (figure does not show) from the 2nd reverse osmosis membrane unit 201b.Purify waste water and transfer dilution path 208, for the 200B that purifies waste water the dense water 200C dilution of discharging from the 1st reverse osmosis membrane unit 201a, purify waste water the 1st and to transfer path 204 and the 1st dense water and transfer path 205 and be communicated with.Circuitous path 209 does not supply to the 2nd reverse osmosis membrane unit 201b and around transfer path 207 to the 2nd dense water, the 1st dense water is transferred path 205 and the 2nd dense water handover path 207 connections in order to make the dense water 200C that discharges from the 1st reverse osmosis membrane unit 201a.
In addition, the purified water recovering apparatus of the 5th embodiment has valve system, and this valve system comprises purification water valve 211 and dense water valve 212.Purify the flow that water valve 211 is used to regulate the 200B that purifies waste water that discharges from any reverse osmosis membrane unit 201 at least.Dense water valve 212 is used to regulate the flow of the 201 dense water 200C that discharge from this reverse osmosis membrane unit.
Specifically, the purified water recovering apparatus of the 5th embodiment has valve system.This valve system comprises purification water valve 211 and dense water valve 212.Purifying water valve 211 is installed in respectively on purify waste water the handover path and the handover dilution path of purifying waste water.Dense water valve 212 is installed in dense water respectively and transfers on path and the circuitous path.In addition, the purified water recovering apparatus of the 5th embodiment, by the opening and closing operations of each valve, decision flow, stream.
In addition, the device of Figure 20 has valve system.This valve system have be installed in respectively the 1st purify waste water transfer path the 204, the 2nd purify waste water transfer path the 206, the 1st dense water transfer path the 205, the 2nd dense water transfer path 207, purify waste water transfer dilution path 208, and circuitous path 209 on the 1st purify water valve 211a, the 2nd and purify water valve 211b, the 1st dense water valve 212a, the 2nd dense water valve 212b, transfer as purifying waste water that the 3rd of dilution path valve purifies water valve 211c and as the 3rd dense water valve 212c of circuitous path with valve.In addition, the device of Figure 20, by the opening and closing operations of each open and close valve, decision stream, flow.
In addition, the purified water recovering apparatus of the 5th embodiment has impurity level determinator 220.This impurity level determinator 220, be supply with among water impurity level determinator 220a2, dense water impurity level determinator 220b2 and the impurity level determinator 220c2 that purifies waste water at least any.Above-mentioned supply water impurity level determinator 220a2 measures the impurity level of the supply water of supplying with in any one reverse osmosis membrane unit 201 at least (the normally dense water 200C of previous stage).Above-mentioned dense water impurity level determinator 220b2 is used for measuring the impurity level of the dense water 200C of any one reverse osmosis membrane unit 201 discharge at least.The above-mentioned impurity level determinator 220c2 that purifies waste water is used for measuring the impurity level of the 200B that purifies waste water of any one reverse osmosis membrane unit 201 discharge at least.
In addition, the purified water recovering apparatus of the 5th embodiment, the measured value that is measured to when the impurity level determinator of this impurity level determinator 220, for more than the benchmark value or when having surpassed benchmark value, promptly, during for any situation at least in the following situation: the measured value that is measured to as above-mentioned supply water impurity level determinator 220a2, for more than the benchmark value of supplying with water or when having surpassed benchmark value; The measured value that above-mentioned dense water impurity level determinator 220b2 is measured to is for more than the benchmark value of dense water or when having surpassed benchmark value; And the measured value that is measured to of the above-mentioned impurity level determinator 220c2 that purifies waste water, for more than the benchmark value of purifying waste water or when having surpassed benchmark value, regulated the valve system of flow by the either party's at least who utilize to purify water valve 211 and dense water valve 212 valve and control, (when not enough benchmark value or benchmark value are following) is low when making transmitance in the above-mentioned reverse osmosis membrane unit 201 than running usually.
In addition, among Figure 20, have and supply with water impurity level determinator 220a2, dense water impurity level determinator 220b2 and the impurity level determinator 220c2 that purifies waste water.Supply with water impurity level determinator 220a2, be used to measure the impurity level of the supply water that supplies to the 2nd reverse osmosis membrane unit 201b.Dense water impurity level determinator 220b2 is used to measure the impurity level from the dense water of the 2nd reverse osmosis membrane unit 201b discharge.The impurity level of purifying waste water determinator 220c2 is used to measure the impurity level of purifying waste water of discharging from the 2nd reverse osmosis membrane unit 201b.
In addition, the purified water recovering apparatus of the 5th embodiment, in Figure 20, the measured value that is measured to when the impurity level determinator of this impurity level determinator 220, above or when having surpassed the 2nd benchmark value for the 2nd benchmark value of setting in addition (benchmark values different) with the benchmark value of control valve mechanism, transfer the 208 enforcement dilutions of dilution path by above-mentioned purifying waste water, implement circuitous (walking around) by above-mentioned circuitous path 209.
The structure of the purified water recovering apparatus of the 5th embodiment has been described above, below, the recovery method of purifying waste water of the 5th embodiment that uses this purified water recovering apparatus is described.
The recovery method of purifying waste water of the 5th embodiment has following operation when turning round usually.Promptly, waste water 200A as supplying with water, supply to the reverse osmosis membrane unit 201 of upstream side, in this reverse osmosis membrane unit 201, waste water 200A is separated into purify waste water 200B and dense water 200C, the 200B that purifies waste water is transferred path 204 by purifying waste water be transplanted on the storage tanks of purifying waste water, dense water 200C as supplying with water, is supplied to the reverse osmosis membrane unit 201 of next stage successively.The 200B that purifies waste water that discharges from the reverse osmosis membrane unit 201 in downstream side successively, transfer path 206 by purifying waste water and be transplanted on the storage tanks of purifying waste water and reclaim.Dense water 200C discharging from the reverse osmosis membrane unit 201 in downstream side is transplanted on outside the system or dense water storage tanks.
In addition, the recovery method of purifying waste water of the 5th embodiment when using the device of Figure 20, has following operation.Promptly, waste water 200A is supplied to the 1st reverse osmosis membrane unit 201a, the 200B that purifies waste water that discharges from the 1st reverse osmosis membrane unit 201a is transplanted on the storage tanks of purifying waste water, dense water 200C is supplied to the 2nd reverse osmosis membrane unit 201b, the 200B that purifies waste water that discharges from the 2nd reverse osmosis membrane unit 201b is transplanted on the storage tanks of purifying waste water, is transplanted on dense water 200C outside the system or dense water storage tanks.
The recovery method of purifying waste water of the 5th embodiment at this usually during running, has termly or measures constantly in following three kinds of impurity levels the operation of any impurity level at least.That is, supply to the impurity level of the supply water of any reverse osmosis membrane unit 201 (being the dense water 200C that discharges from the 1st reverse osmosis membrane unit 201a among Figure 20) at least by supplying with water impurity level determinator 220a2 mensuration; Measure the impurity level of dense water (being the dense water 200C that discharges from the 2nd reverse osmosis membrane unit 201b Figure 20) from any reverse osmosis membrane unit 201 discharge at least by dense water impurity level determinator 220b2; And the impurity level of measuring purify waste water (being the 200B that purifies waste water that discharges from the 2nd reverse osmosis membrane unit 201b Figure 20) of discharging by the impurity level determinator 220c2 that purifies waste water from any reverse osmosis membrane unit 201 at least.
In addition, the recovery method of purifying waste water of the 5th embodiment has following operation.That is, more than measured value is the 1st benchmark value or when having surpassed the 1st benchmark value, with the transmitance in the valve system restriction reverse osmosis membrane unit.This valve system utilization purifies any the valve regulation flow at least in water valve 211 and the dense water valve 212.
For example, the recovery method of purifying waste water of the 5th embodiment when adopting device shown in Figure 20, has following operation.That is low when, being controlled to be the transmitance among the 1st reverse osmosis membrane unit 201a, the 2nd reverse osmosis membrane unit 201b than common running by valve system.Above-mentioned valve system utilizes the 1st to purify water valve 211a, the 1st dense water valve 212a, the 2nd purification water valve 211b, the 2nd dense water valve 212b, the 3rd any valve regulation flow at least that purifies among water valve 211c and the 3rd dense water valve 212c.
In addition, the recovery method of purifying waste water of the 5th embodiment, as required, possess: more than measured value is for the 2nd benchmark value of setting in addition or when having surpassed the 2nd benchmark value, implements to purify waste water and transfer the dilution in dilution path 208 or the circuitous operation of circuitous path 209.
The recovery method of purifying waste water of the 5th embodiment by aforesaid operations, can suppress excessively concentrating in the reverse osmosis membrane unit 201, suppresses scale and is attached on the film.
[the 6th embodiment]
Below, the purified water recovering apparatus of the 6th embodiment and the recovery method of purifying waste water are described.
Here, omitted and the explanation of the 4th, the 5th embodiment multiple, the title of each one and Reference numeral are suitably quoted title and the Reference numeral in the 4th, the 5th embodiment.In the 6th embodiment, there is not the content of special instruction, identical with the content that illustrates in the 4th, the 5th embodiment.
Figure 21 is the sketch chart of the purified water recovering apparatus of expression the 6th embodiment.
As shown in figure 21, the purified water recovering apparatus of the 6th embodiment has reverse osmosis membrane unit 201.This reverse osmosis membrane unit 201 filters with reverse osmosis membrane and is separated into permeate water and as the dense water 200C of non-permeate water supplying with water conservancy.
Specifically, the purified water recovering apparatus of the 6th embodiment has separately along a plurality of reverse osmosis membranes unit 201 that water (flow) direction is vertically connecting with arranging.In addition, in the purified water recovering apparatus of the 6th embodiment, waste water 200A is as supplying with the reverse osmosis membrane unit 201 that water is fed into upstream side, the permeate water of discharging from the reverse osmosis membrane unit 201 of a prime, be fed into other reverse osmosis membrane unit 201 as supplying with water, the permeate water of discharging from any reverse osmosis membrane unit 201 at least is recovered.
The purified water recovering apparatus of the 6th embodiment in the device of Figure 21, has the 1st reverse osmosis membrane unit 201a and the 2nd reverse osmosis membrane unit 201b.Waste water 200A is fed into the 1st reverse osmosis membrane unit 201a as supplying with water, and the 1st reverse osmosis membrane unit 201a is separated into permeate water and dense water 200C to waste water 200A and discharges.Permeate water from the 1st reverse osmosis membrane unit 201a discharges is fed into the 2nd reverse osmosis membrane unit 201b as supplying with water.In addition, in the purified water recovering apparatus of the 6th embodiment, discharging the permeate water 200B that promptly purifies waste water from the 2nd reverse osmosis membrane unit 201b is recovered, and, from the dense water 200C of the 1st reverse osmosis membrane unit 201a and the 2nd reverse osmosis membrane unit 201b discharge, be shifted into outside the system or dense water storage tanks (figure does not show).
In the purified water recovering apparatus of the 6th embodiment, have a plurality of pipe arrangements.The purified water recovering apparatus of the 6th embodiment has permeate water and transfers path 230.This permeate water is transferred path 230, the permeate water of discharging from each reverse osmosis membrane unit 201, is transplanted on the reverse osmosis membrane unit 201 of next stage, perhaps is transplanted on the storage tanks of purifying waste water as purifying waste water.
In addition, the purified water recovering apparatus of the 6th embodiment has permeate water and transfers dilution path 232.This permeate water is transferred dilution path 232, transfers the permeate water of coming out from any reverse osmosis membrane unit 201 at least as required, and the supply water of this permeate water upstream side is diluted.In addition, the purified water recovering apparatus of the 6th embodiment has dense water and transfers dilution path 234.This dense water is transferred dilution path 234, as required, transfers the dense water 200C that comes out from any reverse osmosis membrane unit 201 at least, and the supply water of this dense water 200C upstream side is diluted.
For example, the device of Figure 21 has the 1st permeate water and transfers path 230a, the 2nd permeate water and transfer path 230b, the 3rd permeate water and transfer that path 230c, permeate water transfer dilution path 232, dense water is transferred dilution path 234.Above-mentioned the 1st permeate water is transferred path 230a, is used for the permeate water of discharging from the 1st reverse osmosis membrane unit 201a is transplanted on the 2nd permeable membrane unit 201b.Above-mentioned the 2nd permeate water is transferred path 230b, is used for the permeate water from the 1st reverse osmosis membrane unit 201a discharge, is transplanted on the storage tanks of purifying waste water (figure does not show) as purifying waste water.Above-mentioned the 3rd permeate water is transferred path 230c, is used for the permeate water from the 2nd reverse osmosis membrane unit 201b discharge, is transplanted on the storage tanks of purifying waste water (figure does not show) as purifying waste water.Above-mentioned permeate water is transferred dilution path 232, is used to transfer the permeate water of coming out from the 2nd reverse osmosis membrane unit 201b, and the supply water of the 1st reverse osmosis membrane unit 201a is diluted.Above-mentioned dense water is transferred dilution path 234, is used to transfer the dense water 200C that the 2nd reverse osmosis membrane unit 201b comes out, and the supply water of the 1st reverse osmosis membrane unit 201a is diluted.
In addition, the purified water recovering apparatus of the 6th embodiment has valve system.This valve system includes and is installed in dense water respectively and transfers path 205,207 and dense water and transfer the dense water valve 212 on the dilution path 234 and be installed in permeate water respectively and transfer path 230 and permeate water and transfer and see through water valve 231 on the dilution path 232.In addition, the purified water recovering apparatus of the 6th embodiment, by the opening and closing operations of each valve, decision stream, flow.
Specifically, the device of Figure 21 has valve system.This valve system has and is installed in the 1st dense water handover path 205 respectively, the 2nd dense water is transferred path 207, the 1st permeate water is transferred path 230a, the 2nd permeate water is transferred path 230b, the 3rd permeate water is transferred path 230c, permeate water is transferred dilution path 232, dense water is transferred the 1st dense water valve 212d on the dilution path 234, the 2nd dense water valve 212b, the 1st sees through water valve 231a, the 2nd sees through water valve 231b, the 3rd sees through water valve 231c, transfer the 4th of dilution path valve as permeate water and see through water valve 231d, transfer the 3rd dense water valve 212e of dilution path valve as dense water.In addition, the device of Figure 21, by the opening and closing operations of each valve, decision stream, flow.
In addition, the purified water recovering apparatus of the 6th embodiment has impurity level determinator 220.This impurity level determinator 220, be supply with among water impurity level determinator 220a3, dense water impurity level determinator 220b3 and the permeate water impurity level determinator 220c3 at least any.Above-mentioned supply water impurity level determinator 220a3 is used for being determined at the impurity level of the supply water (the normally permeate water of prime) of any one reverse osmosis membrane unit 201 supply at least.Above-mentioned dense water impurity level determinator 220b3 is used for being determined at the impurity level of the dense water 200C of any one reverse osmosis membrane unit 201 discharge at least.Above-mentioned permeate water impurity level determinator 220c3 is used for being determined at any one reverse osmosis membrane unit 201 at least, the impurity level of the permeate water of discharge.
In addition, the purified water recovering apparatus of the 6th embodiment, the measured value that is measured to when the impurity level determinator of impurity level determinator 220, for more than the benchmark value or when having surpassed benchmark value, promptly, during for any situation at least in the following situation: the measured value that is measured to as above-mentioned supply water impurity level determinator 220a3, for more than the benchmark value of supplying with water or when having surpassed benchmark value; The measured value that above-mentioned dense water impurity level determinator 220b3 is measured to is for more than the benchmark value of dense water or when having surpassed benchmark value; And the measured value that is measured to of above-mentioned permeate water impurity level determinator 220c3, for more than the benchmark value of permeate water or when having surpassed benchmark value, regulate the valve system of flow by the valve that utilizes the either party at least who sees through water valve 231 and dense water valve 212, with the transmitance in the above-mentioned reverse osmosis membrane unit, low when being controlled to be than common running.
In addition, among Figure 21, have and supply with water impurity level determinator 220a3, dense water impurity level determinator 220b3 and permeate water impurity level determinator 220c3.Supply with water impurity level determinator 220a3, be used to measure the impurity level of the supply water that supplies to the 2nd reverse osmosis membrane unit 201b.Dense water impurity level determinator 220b3 is used to measure the impurity level from the dense water of the 2nd reverse osmosis membrane unit 201b discharge.Permeate water impurity level determinator 220c3 is used to measure the impurity level from the permeate water of the 2nd reverse osmosis membrane unit 201b discharge.
In addition, the purified water recovering apparatus of the 6th embodiment, in Figure 21, the measured value that is measured to when the impurity level determinator of this impurity level determinator 220, for more than the 2nd benchmark value of setting in addition or when having surpassed the 2nd benchmark value, by above-mentioned permeate water transfer dilution path 232, above-mentioned dense water is transferred dilution path 234 and is implemented dilution.
The 1st benchmark value is the cut off value that determines whether to limit with valve system the transmitance in the above-mentioned reverse osmosis membrane unit.Above-mentioned valve system utilizes any the valve regulation flow at least that sees through in water valve 231 and the dense water valve 212.Be attached to viewpoint on the reverse osmosis membrane from the viewpoint of the 200B that purifies waste water that obtains predetermined above purity or from suppressing scale, decide the 1st benchmark value.
The structure of the purified water recovering apparatus of the 6th embodiment has been described above, below, the recovery method of purifying waste water of the 6th embodiment that uses this purified water recovering apparatus is described.
The recovery method of purifying waste water of the 6th embodiment has following operation when turning round usually.Promptly, waste water 200A as supplying with water, supply to the reverse osmosis membrane unit 201 of upstream side, in this reverse osmosis membrane unit 201, waste water 200A is separated into permeate water and dense water 200C, dense water is transferred path 205,207 by dense water be transplanted on outside the system or dense water storage tanks, permeate water as supplying with water, is transferred path 230 by permeate water and supplied to the reverse osmosis membrane unit 201 of subordinate successively.The permeate water of discharging,, transfer path 230 by permeate water and be transplanted on the storage tanks of purifying waste water and reclaim as the 200B that purifies waste water from the reverse osmosis membrane unit 201 in downstream side successively.
In addition, the recovery method of purifying waste water of the 6th embodiment when using the device of Figure 21, has following operation.That is, waste water 200A is supplied to the 1st reverse osmosis membrane unit 201a, the permeate water of discharging from the 1st reverse osmosis membrane unit 201a is supplied to the 2nd reverse osmosis membrane unit 201b.In addition, the permeate water of discharging from the 2nd reverse osmosis membrane unit 201b, 200B is transplanted on the storage tanks of purifying waste water as purifying waste water.In addition, from the dense water 200C of the 1st reverse osmosis membrane unit 201a discharge and the dense water 200C that discharges from the 2nd reverse osmosis membrane unit 201b, be transplanted on outside the system or dense water storage tanks.
The recovery method of purifying waste water of the 6th embodiment at this usually during running, has termly or measures constantly in following three kinds of impurity levels the operation of any impurity level at least.That is, supply to the impurity level of the supply water of any reverse osmosis membrane unit 201 (being the permeate water of discharging among Figure 21) at least from the 1st reverse osmosis membrane unit 201a by supplying with water impurity level determinator 220a3 mensuration; Measure the impurity level of dense water (being the dense water 200C that discharges from the 2nd reverse osmosis membrane unit 201b Figure 21) from any reverse osmosis membrane unit 201 discharge at least by dense water impurity level determinator 220b3; And the impurity level of measuring permeate water (being the permeate water of discharging Figure 21) by permeate water impurity level determinator 220c3 from the 2nd reverse osmosis membrane unit 201b from any reverse osmosis membrane unit 201 discharge at least.
In addition, the recovery method of purifying waste water of the 6th embodiment has following operation.That is, more than measured value is the 1st benchmark value or when having surpassed the 1st benchmark value,, limit the transmitance in the above-mentioned reverse osmosis membrane unit by utilizing the valve that sees through at least one side in water valve 231 and the dense water valve 212 to regulate the valve system of flow.
For example, the recovery method of purifying waste water of the 6th embodiment when adopting device shown in Figure 21, has following operation.Promptly, by utilizing the 1st to see through water valve 231a, the 1st dense water valve 212d, the 2nd and see through water valve 231b, the 2nd dense water valve 212b, the 3rd and see through water valve 231c, the 3rd dense water valve 212e and the 4th and see through the valve system that any valve at least among the water valve 231d is regulated flow, control the transmitance among the 1st reverse osmosis membrane unit 201a, the 2nd reverse osmosis membrane unit 201b.
In addition, the recovery method of purifying waste water of the 6th embodiment, as required, have: more than measured value is the 2nd benchmark value or when having surpassed the 2nd benchmark value, for example, use under the situation of device shown in Figure 21, the either party at least who is transferred in dilution path 232 and the dense water handover dilution path 234 by permeate water implements dilution.
[other embodiment]
The purified water recovering apparatus of the 2nd, the 3rd, the 4th, the 5th, the 6th embodiment and the recovery method of purifying waste water have been described above, and still, the present invention is not subjected to the qualification of the 2nd, the 3rd, the 4th, the 5th, the 6th embodiment, can do suitable design alteration.
For example, the purified water recovering apparatus of the 2nd embodiment, having purifies waste water transfer dilution path 108 and circuitous path 109 the two.But the present invention also can only have wherein either party.
In addition, for example, Figure 11～supply water impurity level determinator 120a shown in Figure 14 is in the front (front) in dilution path, still, among the present invention, also can be in the downstream side in dilution path.
In addition, for example, the purified water recovering apparatus of the 3rd embodiment, have permeate water transfer dilution path 132 and dense water transfer path 134 the two, but the present invention also can only have wherein either party.
In addition, for example, the purified water recovering apparatus of the 4th, the 5th embodiment, have purify water valve 211 and dense water valve 212 the two, the purified water recovering apparatus of the 6th embodiment, have through water valve 231 and dense water valve 212 the two, but the present invention also can only have wherein either party.

Claims (15)

1. a water treatment method makes former water flow into the membrane separation assemblies that uses reverse osmosis membrane, and former water sepn is become treating water and dense water, it is characterized in that,
Measure the impurity level of above-mentioned former water, above-mentioned treating water or above-mentioned dense water,, regulate the water quality of above-mentioned treating water according to the measured value of this impurity level that determines.
2. water treatment device has the membrane separation assemblies that uses reverse osmosis membrane, makes former water flow into this membrane module and former water sepn is become treating water and dense water, it is characterized in that,
Have the impurity level determinator that at least one measures the impurity level of above-mentioned former water, above-mentioned treating water or above-mentioned dense water, according to the measured value that determines by this impurity level determinator, the water quality of regulating above-mentioned treating water.
3. water treatment method, make the former water that contains salt flow into the membrane separation assemblies that uses reverse osmosis membrane, use above-mentioned reverse osmosis membrane, the concentration that the concentration that former water sepn is become salt is lower than the treating water of above-mentioned former water and salt is higher than the dense water of above-mentioned former water, and, make above-mentioned former water flow into membrane separation assemblies continuously, above-mentioned dense water is flowed out from membrane separation assemblies continuously, and above-mentioned treating water is flowed out from membrane separation assemblies continuously; It is characterized in that,
To be controlled to be from the discharge of the effusive above-mentioned treating water of membrane separation assemblies necessarily, and the concentration of the salt of above-mentioned treating water can be controlled at the mode below the preset value, according to the amount of the salt that sees through above-mentioned reverse osmosis membrane, the influx of above-mentioned former water is changed.
4. water treatment method as claimed in claim 3 is characterized in that, utilizes the electric conductivity of above-mentioned former water or above-mentioned treating water, obtains the amount through the salt of reverse osmosis membrane.
5. water treatment device, have the membrane separation assemblies that uses reverse osmosis membrane, make the former water that contains salt flow into this membrane separation assemblies, use above-mentioned reverse osmosis membrane, the concentration that the concentration that former water sepn is become salt is lower than the treating water of above-mentioned former water and salt is higher than the dense water of above-mentioned former water, and above-mentioned former water flows into membrane separation assemblies continuously, above-mentioned thus dense water flows out from membrane separation assemblies continuously, and above-mentioned treating water flows out from membrane separation assemblies continuously; It is characterized in that,
Have being controlled to be certain controlling organization, and make the influx of above-mentioned former water change, thus the concentration of the salt of above-mentioned treating water is controlled at the controlling organization below the preset value according to the amount of the salt that sees through above-mentioned reverse osmosis membrane from the discharge of the effusive above-mentioned treating water of membrane separation assemblies.
6. water treatment device as claimed in claim 5 is characterized in that, in order to obtain the amount through the salt of reverse osmosis membrane, has the Conductivity Meters of the electric conductivity of measuring above-mentioned former water or above-mentioned treating water.
7. purified water recovering apparatus, have to filter and to supply with water sepn and become that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, as above-mentioned supply water supply waste water, reclaim purifying waste water of discharging from above-mentioned reverse osmosis membrane unit; It is characterized in that,
Having at least one measures the impurity level determinator of above-mentioned supply water, above-mentioned dense water or above-mentioned impurity level of purifying waste water and transfers above-mentioned purifying waste water and with above-mentioned supply water-reducible dilution path and walk around above-mentioned reverse osmosis membrane unit, above-mentioned supply water is not filtered and will supply with the path of the either party at least among water is transplanted on the downstream side as dense water the circuitous path; The measured value that determines when above-mentioned impurity level determinator is more than the benchmark value or when having surpassed benchmark value, implement the dilution undertaken by above-mentioned dilution path and by above-mentioned circuitous path carry out walk around among either party at least.
8. purified water recovering apparatus, have multistage the filtration along water (flow) direction and become supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement, reclaiming clean water as supplying with water as the dense water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water from previous stage reverse osmosis membrane unit; It is characterized in that,
The impurity level determinator and transferring that has an impurity level of purifying waste water of at least one the dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge or discharge is purified waste water or waste water and will supply with water-reducible dilution path and walk around the reverse osmosis membrane unit, supply water is not filtered and will supply with the path of the either party at least among water is transplanted on the downstream side as dense water the circuitous path; When the measured value that is determined by above-mentioned impurity level determinator is more than the benchmark value or has surpassed benchmark value, implement the dilution undertaken by above-mentioned dilution path and by above-mentioned circuitous path carry out walk around among either party at least.
9. purified water recovering apparatus, have along water (flow) direction and multistagely to filter by reverse osmosis membrane that a water sepn becomes permeate water and non-permeate water is the reverse osmosis membrane unit of dense water supplying with, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the permeate water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, be recovered as purifying waste water from the unitary permeate water of any reverse osmosis membrane at least from previous stage reverse osmosis membrane unit; It is characterized in that,
Have at least one the dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge or discharge permeate water impurity level the impurity level determinator and transfer from this reverse osmosis membrane unit or the unitary permeate water of other reverse osmosis membranes or dense water, will lean on the water-reducible dilution of the supply path of upstream side than this permeate water or this dense water; When the measured value that is determined by above-mentioned impurity level determinator is more than the benchmark value or has surpassed benchmark value, implement the dilution of being undertaken by above-mentioned dilution path.
10. purified water recovering apparatus, have to filter and become supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, as above-mentioned supply water supply waste water, reclaim purifying waste water of discharging from above-mentioned reverse osmosis membrane unit; It is characterized in that,
Have the impurity level determinator that at least one measures above-mentioned supply water, above-mentioned dense water or above-mentioned impurity level of purifying waste water, and valve system, this valve system comprises the purification water valve of regulating above-mentioned flow of purifying waste water and regulates either party at least among the dense water valve of flow of above-mentioned dense water; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
11. purified water recovering apparatus, have multistage the filtration along water (flow) direction and become supplying with a water sepn that permeate water is promptly purified waste water and non-permeate water is the reverse osmosis membrane unit of dense water by reverse osmosis membrane, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the dense water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, reclaim from purifying waste water that discharge each reverse osmosis membrane unit from previous stage reverse osmosis membrane unit; It is characterized in that,
Have the impurity level determinator of the impurity level of purifying waste water of at least one dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge, discharge, and valve system, this valve system comprises the purification water valve of the flow of purifying waste water that adjusting discharges from this reverse osmosis membrane unit and regulates either party at least among the dense water valve of flow of the dense water of discharging from this reverse osmosis membrane unit; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
12. purified water recovering apparatus, have along water (flow) direction and multistagely to filter by reverse osmosis membrane that a water sepn becomes permeate water and non-permeate water is the reverse osmosis membrane unit of dense water supplying with, be fed into the unitary mode of other reverse osmosis membranes and dispose arrangement as supplying with water as the permeate water of supplying with reverse osmosis membrane unit that water is fed into upstream side, discharging with waste water, be recovered as purifying waste water from the unitary permeate water of any reverse osmosis membrane at least from previous stage reverse osmosis membrane unit; It is characterized in that,
Have the impurity level determinator of impurity level of the permeate water of at least one dense water of measuring the supply water supplied with in any reverse osmosis membrane unit at least, discharge, discharge, and valve system, this valve system comprises the seeing through water valve and regulate either party at least among the dense water valve of flow of the dense water of discharging from this reverse osmosis membrane unit of flow of the permeate water that adjusting discharges from this reverse osmosis membrane unit; According to the measured value that determines by above-mentioned impurity level determinator, control transmitance in the above-mentioned reverse osmosis membrane unit by above-mentioned valve system.
13. as each described purified water recovering apparatus in the claim 10 to 12, it is characterized in that, when the measured value that is determined by above-mentioned impurity level determinator is more than the benchmark value or has surpassed benchmark value, by above-mentioned valve system, low when being controlled to be the transmitance in the above-mentioned reverse osmosis membrane unit than common running.
14., it is characterized in that above-mentioned impurity level determinator is a device of measuring among electric conductivity, ionic concn, salt concn, total dissolved matter concentration, pH and the ORP each as each described purified water recovering apparatus in the claim 7 to 13.
15. a recovery method of purifying waste water is characterized in that, uses each described purified water recovering apparatus in the claim 7 to 14, purifying is purified waste water and is reclaimed from waste water.
CN200880107777.0A 2007-10-29 2008-10-23 Water treatment method, water treatment apparatus, method for recovering purified water, and purified water recovering apparatus Expired - Fee Related CN101801857B (en)

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JP2007310271A JP5075597B2 (en) 2007-11-30 2007-11-30 Purified water recovery device and purified water recovery method
JP333795/2007 2007-12-26
JP2007333795A JP2009154070A (en) 2007-12-26 2007-12-26 Purified water recovering apparatus and method for recovering purified water
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