JP6956223B2 - Purified water supply system and its operation method - Google Patents

Description

The present invention relates to a purified water supply system and a method of operating the same.

For dialysis treatment, a dialysis apparatus is used in which a dialysate is prepared from purified water and a dialysis base material, and dialysis is performed using the dialysate.
The purified water supply system that supplies purified water to the dialysis equipment includes a purified water production equipment that produces purified water, a purified water external circulation line that circulates the purified water produced by the purified water production equipment in a hospital, etc. There is known one provided with a purified water distribution line that branches from the middle of the purified water external circulation line and distributes purified water to a personal dialysis apparatus arranged for each hospital room or bed (for example, Patent Document 1). ).

In dialysis treatment, it is required that the dialysate is not contaminated by bacteria or endotoxin. Therefore, dialysis machines and purified water supply systems are frequently disinfected. For example, in the dialysis machine and the purified water supply system described in Patent Document 1, in order to disinfect the dialysis machine, a high-concentration sodium hypochlorite aqueous solution is directly passed through the dialysis machine. Since a high-concentration sodium hypochlorite aqueous solution easily corrodes pipes, a high-concentration sodium hypochlorite aqueous solution is added to purified water when disinfecting the purified water production equipment and the external circulation line of purified water. The low-concentration chemical solution for disinfection prepared in the above is passed through a purified water production apparatus and an external circulation line for purified water.

Japanese Unexamined Patent Publication No. 2005-0344433

However, when the purified water supply system described in Patent Document 1 is disinfected with a low-concentration disinfectant chemical solution, the disinfectant chemical solution can be passed through the purified water external circulation line, but the purified water branched from the middle of the purified water external circulation line. The disinfectant chemical cannot be passed through the water distribution line.
Recently, pollution control measures are required at a higher level for the entire purified water supply system, and advanced pollution control measures are also required for the purified water distribution line.

The present invention is a purified water supply system capable of distributing and supplying purified water produced by a purified water production apparatus. The purified water distribution line is less likely to be contaminated, and when the purified water supply system is disinfected, the purified water is distributed. Provided is a purified water supply system capable of disinfecting to the end of the line at a high level and a method of operating the system.

The present invention has the following aspects.
<1> A purified water production apparatus for producing purified water; a purified water circulation line for circulating the purified water produced by the purified water production apparatus to the outside of the purified water production apparatus; a branch from the middle of the purified water circulation line. The purified water distribution line; A bypass line is provided; the purified water production apparatus is provided with either or both of a heating means for heating the purified water and a chemical solution stock solution adding means for adding the chemical solution stock solution to the purified water. Water supply system.
<2> The purified water supply system according to <1>, further comprising one or both of the driving of the heating means and the driving of the chemical stock solution addition means, and a control means for controlling the opening and closing of the purified water distribution line.
<3> The purified water supply system according to <1> or <2>, wherein a sample port capable of taking out a part of the purified water flowing through the bypass line is provided in the middle of the bypass line.
<4> A method of operating the purified water supply system according to any one of <1> to <3>; while operating the purified water supply system, the purified water produced by the purified water producing apparatus is used. Always circulate in the purified water circulation line; when disinfecting the purified water circulation line and the purified water distribution line, the purified water is heated by the heating means, or the chemical solution stock solution is added to the purified water by the chemical solution stock solution addition means. How to operate the purified water supply system.

The purified water supply system of the present invention can distribute and supply purified water produced by the purified water production apparatus, the purified water distribution line is less likely to be contaminated, and when the purified water supply system is disinfected, the purified water distribution line. It is possible to disinfect up to the edge of the water at a high level.
According to the operation method of the purified water supply system of the present invention, the purified water produced by the purified water production apparatus can be distributed and supplied, the purified water distribution line is less likely to be contaminated, and when the purified water supply system is disinfected. It is possible to disinfect at a high level up to the end of the purified water distribution line.

It is a schematic block diagram which shows an example of the purified water supply system of this invention. It is a schematic block diagram which shows an example of the purified water production apparatus. FIG. 5 is a schematic configuration diagram showing a state in which a personal dialysis machine is connected to the purified water supply system of FIG.

<Purified water supply system>
FIG. 1 is a schematic configuration diagram showing an example of the purified water supply system of the present invention.
The purified water supply system 1 includes a purified water production apparatus 10 for producing purified water; and a purified water external circulation line 100 (purified water circulation) that circulates the purified water produced by the purified water production apparatus 10 to the outside of the purified water production apparatus 10. Line) and; a plurality of purified water distribution lines 102 for distributing and supplying purified water to the purified water supply target by branching from the middle of the purified water external circulation line 100; A main drainage line 104 (drainage line) for discharging the wastewater generated in the purified water supply system 1 to the outside; purified water from the purified water distribution line 102 and drainage from the purified water supply target to the main drainage line 104. The first drainage introduction line 106 (drainage line) and the second drainage introduction line 108 (drainage) provided by branching from the main drainage line 104 for each purified water distribution line 102 and the purified water supply target so that the water can be introduced. Line) and; the first end is detachably connected to the end of the purified water distribution line 102, the second end is detachably connected to the end of the first drainage introduction line 106, and the purified water distribution line. It is provided with a bypass line 110 that directly feeds the purified water that has passed through 102 to the main drainage line 104 via the first drainage introduction line 106 without passing through the purified water supply target.

The purified water supply system 1 is further provided in the middle of the purified water distribution line 102 with a solenoid valve 112 for opening and closing the purified water distribution line 102; and a first drainage introduction line 106. It is provided with a solenoid valve 116 that opens and closes the drainage introduction line 106.

The purified water supply system 1 is further electrically connected to the purified water production apparatus 10 and electrically connected to the solenoid valve 112 and the solenoid valve 116 via the relay board 120 to be electrically connected to the purified water production apparatus 10 and each of them. A control device 80 (control means) for controlling the solenoid valve is provided.

The purified water supply system 1 further includes an ultrafiltration membrane filter 90 provided in the middle of the purified water external circulation line 100 before the purified water is returned to the purified water production apparatus 10. The ultrafiltration membrane filter 90 is provided for removing bacteria and endotoxin in the purified water external circulation line 100.

(Purified water production equipment)
FIG. 2 is a schematic configuration diagram showing an example of a purified water production apparatus.
The purified water production apparatus 10 includes a raw water tank 12 for storing raw water supplied from a tap or the like; and an activated charcoal filter 14 containing activated charcoal for removing residual chlorine in the raw water sent from the raw water tank 12; A check filter 16 that removes dust and fine powder of activated charcoal; a nanofilter membrane module 18 that contains a nanofilter membrane element that softens raw water; and a back-penetration membrane that filters the softened raw water to obtain purified water. The reverse osmotic membrane module 20; the purified water tank 22 for storing purified water; the ultraviolet lamp 24 for sterilizing the purified water in the purified water tank 22; and the heater 26 for heating the purified water in the purified water tank 22 (heating means). ) And; a temperature sensor (not shown) for measuring the temperature of purified water in the purified water tank 22; and a chemical solution stock solution tank 28 (chemical solution stock solution adding means) for storing the chemical solution stock solution.

The purified water production apparatus 10 further includes a raw water supply line 30 in which the first end is connected to the raw water tank 12 and the second end is connected to the activated charcoal filter 14; the first end is the activated charcoal filter. With the first raw water transfer line 32 connected to 14 and the second end connected to the check filter 16; the first end connected to the check filter 16 and the second end connected to the nanofiltration membrane module 18 With a second raw water transfer line 34 connected to; a soft water transfer line 36 with a first end connected to the nanofiltration membrane module 18 and a second end connected to the back-penetration membrane module 20; With a purified water transfer line 38 with an end connected to the back osmotic membrane module 20 and a second end connected to the purified water tank 22; a first end connected to the purified water tank 22 and a second end. A purified water internal circulation line 40 whose unit is connected to a soft water transfer line 36 on the downstream side of the pressurizing pump 74; and a drainage line 42 for an apparatus for discharging the wastewater generated in the purified water production apparatus 10 to the outside; With the first concentrated water drain line 44, where the first end is connected to the nanofiltration membrane module 18 and the second end is connected to the equipment drain line 42; the first end is the back osmotic membrane module 20. With a second concentrated water drain line 46, the second end of which is connected to the equipment drain line 42; the first end of which is connected to the chemical stock solution tank 28 and the second end of which is purified. It is provided with a chemical solution stock solution supply line 48 (chemical solution stock solution adding means) connected to a purified water external circulation line 100 before the water is returned to the purified water tank 22.
The purified water production apparatus 10 further includes a part of the above-mentioned purified water external circulation line 100 in which the first end and the second end are connected to the purified water tank 22.

The purified water production apparatus 10 is further provided with an electromagnetic valve 50 provided in the middle of the raw water supply line 30 to open / close the raw water supply line 30; and is provided in the middle of the soft water transfer line 36 to open / close the soft water transfer line 36. The electromagnetic valve 52; the electromagnetic valve 54 provided in the middle of the purified water internal circulation line 40 to open and close the purified water internal circulation line 40; and the electromagnetic valve 54 provided in the middle of the first concentrated water discharge line 44 and the first concentration An electromagnetic valve 56 that opens and closes the water discharge line 44; an electromagnetic valve 58 that is provided in the middle of the second concentrated water discharge line 46 and opens and closes the second concentrated water discharge line 46; A check valve 60 provided in the middle of the upstream side of the valve 52; a check valve 62 provided in the middle of the purified water transfer line 38; a check valve 62 provided in the middle of the purified water internal circulation line 40; A check valve 64 provided in the middle; an electromagnetic valve 66 (means for adding the drug solution stock solution) provided in the middle of the chemical solution stock solution supply line 48 to open and close the chemical solution stock solution supply line 48; and an electromagnetic valve of the chemical solution stock solution supply line 48. It is provided with a check valve 68 (chemical solution stock solution adding means) provided in the middle on the downstream side of 66.

The purified water production apparatus 10 further includes a raw water pump 70 provided in the middle of the electromagnetic valve 50 of the raw water supply line 30; and a pressurizing pump 72 provided in the middle of the second raw water transfer line 34. A pressurizing pump 74 provided in the middle of the soft water transfer line 36 on the downstream side of the electromagnetic valve 52; an internal circulation pump provided between the electromagnetic valve 54 and the check valve 64 of the purified water internal circulation line 40. 76; External circulation pump 78 provided in the middle of the purified water external circulation line 100; Chemical solution stock solution pump 79 provided near the outlet of the chemical solution stock solution tank 28 on the upstream side of the electromagnetic valve 66 of the chemical solution stock solution supply line 48. (Means for adding undiluted chemical solution).
A control device 80 for controlling these is electrically connected to the ultraviolet lamp 24, the heater 26, the temperature sensor, each solenoid valve, each pump, and the like.

As the reverse osmosis membrane module 20, a reverse osmosis membrane module usually used in a purified water production apparatus may be used, and is not particularly limited. Examples of the reverse osmosis membrane module include the spiral type reverse osmosis membrane module described in Japanese Patent No. 4990710. The spiral type reverse osmosis membrane module is a cylindrical reverse osmosis membrane element in which a reverse osmosis membrane is wound around a water collecting pipe, which is housed in a cylindrical casing. It separates into purified water that has permeated the membrane and concentrated water that does not permeate the reverse osmosis membrane. As the reverse osmosis membrane, a reverse osmosis membrane usually used in purified water production equipment may be used, and is not particularly limited. Examples of the material of the reverse osmosis membrane include polyamide, polysulfone, cellulose acetate, polyacrylonitrile and the like.

As the nanofiltration membrane module 18, a nanofiltration membrane module usually used in a purified water production apparatus may be used, and is not particularly limited. Examples of the nanofiltration membrane module include a spiral type nanofiltration membrane module having the same structure as the spiral type reverse osmosis membrane module. The spiral type nanofiltration membrane module is a cylindrical nanofiltration membrane element in which a nanofiltration membrane is wound around a water collection pipe, which is housed in a cylindrical casing. The raw water introduced from the raw water inlet is nanofiltered. It separates into soft water that has permeated the membrane and concentrated water that does not permeate the nanofiltration membrane.

The nanofiltration membrane (NF membrane) is a membrane having an intermediate pore diameter between the ultrafiltration membrane (UF membrane) and the reverse osmosis membrane (RO membrane) and having a charge on the surface of the membrane material. According to the definition of IUPAC {"Membrane and Membrane Process Terminology (1996 IUPAC recommended)" described in Journal of Polymer Science, 120, 149-159 (1996)}, a nanofiltration membrane is "particles smaller than 2 nm. It is said to be a pressure-driven membrane separation process in which macromolecules are blocked. Incidentally, the microfiltration membrane (MF membrane) is said to be a membrane larger than 0.1 μm, and the ultrafiltration membrane (UF membrane) is a membrane capable of blocking a membrane in the range of 0.1 μm to 2 nm. That is, the nanofiltration membrane combines the separation by pores (size separation) and the separation effect due to the electric interaction between the charge on the membrane surface and the ionic component in the solute, and the membrane's unique blocking performance and permeation performance. Is shown.

As the nanofiltration membrane, one using polyamide as a material (hereinafter, also referred to as a polyamide-based nanofiltration membrane) is preferable. Since polyamide-based nanofiltration membranes have a negative fixed charge on the surface of the membrane material, divalent or higher cations, especially calcium ions, are compared to ordinary nanofiltration membranes such as cellulose acetate, polysulfone, and polyacrylonitrile. It has a high ability to remove hardness components such as magnesium ions and is ideal for softening raw water. In addition, the polyamide-based nanofiltration membrane has less retention of raw water than the ion exchange resin, so that bacteria are less likely to grow. Further, since the polyamide-based nanofiltration membrane can block particles and polymers having a size smaller than 2 nm, endotoxin can be removed. In addition, the polyamide-based nanofiltration membrane has a higher flow rate, a wider usable pH range and temperature range, a higher endotoxin removal ability, and higher chemical resistance than the cellulose acetate-based membrane, which is a normal nanofiltration membrane.

The high-pressure pump used for each pump may be any pump that is normally used in purified water production equipment, and is not particularly limited. Examples of the high-pressure pump include a multi-stage centrifugal pump and a plunger pump.

The chemical solution stock solution adding means includes a chemical solution stock solution tank 28, a chemical solution stock solution supply line 48, an electromagnetic valve 66, a check valve 68, and a chemical solution stock solution pump 79, and is made up of purified water in the purified water production apparatus 10. It is a means for adding a stock solution of a chemical solution to a drug solution. By driving the drug solution stock solution adding means, that is, opening the solenoid valve 66 and driving the drug solution stock solution pump 79, the drug solution stock solution is added to the purified water of the purified water external circulation line 100.

(Purified water circulation line)
The purified water external circulation line 100 requires purified water produced by the purified water production apparatus 10 in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor equipment factories, etc.). It is a line for sending purified water to the vicinity of equipment, equipment, etc.
The purified water external circulation line 100 is arranged inside or outside a structure such as a ceiling, floor, wall, or counter of a facility.

In the purified water external circulation line 100, flow rate information (electrical signal) of purified water flowing through the purified water external circulation line 100 for determining whether or not the purified water is distributed and supplied to the purified water supply target in the processing unit of the control device 80. ) Is provided with a flow sensor or flow switch.
Further, the purified water external circulation line 100 contains temperature information of purified water flowing through the purified water external circulation line 100 for determining whether or not the purified water external circulation line 100 is being disinfected with hot water in the processing unit of the control device 80. A temperature sensor for acquiring (electrical signal) may be provided.

(Purified water distribution line)
The purified water distribution line 102 is a line for distributing and supplying purified water to the purified water supply target by branching from the middle of the purified water external circulation line 100. When it is not necessary to distribute and supply purified water to the purified water supply target, the first end of the bypass line 110, which will be described later, is detachably connected to the end of the purified water distribution line 102.

The purified water distribution line 102 is arranged inside or outside a structure such as a ceiling, floor, wall, or counter of a facility, and at least its end is projected outside the structure.
At the end of the purified water distribution line 102, a connector for detachably connecting a water pipe of the purified water supply target, a bypass line 110 described later, and the like is provided.
On the upstream side of the electromagnetic valve 112 of the purified water distribution line 102, purified water flows through the purified water distribution line 102 for determining whether or not the purified water is distributed and supplied to the purified water supply target in the processing unit of the control device 80. A flow rate sensor 122 for acquiring the flow rate information (electrical signal) of the above is provided.

Targets for supplying purified water include equipment and devices that require purified water in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor equipment factories, etc.). Examples of equipment, devices, and the like that require purified water in medical facilities include personal dialysis machines and the like that are arranged for each hospital room or bed.

(Drainage line)
The main drainage line 104, the first drainage introduction line 106, and the second drainage introduction line 108 are drainage lines for discharging the wastewater generated in the purified water supply system 1 to the outside.
A second end of the bypass line 110, which will be described later, is detachably connected to the end of the first drainage introduction line 106. The end of the drainage pipe of the purified water supply target is detachably connected to the end of the second drainage introduction line 108. When it is not necessary to distribute and supply purified water to the purified water supply target, it is not necessary to connect the end of the drain pipe of the purified water supply target to the end of the second drainage introduction line 108.

The main drainage line 104, the first drainage introduction line 106, and the second drainage introduction line 108 are arranged inside or outside the structure such as the ceiling, floor, wall, and counter of the facility, and at least the first drainage introduction. The end of the line 106 and the end of the second drainage introduction line 108 project outside the structure.
At the end of the first drainage introduction line 106 and the end of the second drainage introduction line 108, connectors for detachably connecting the drainage pipe of the purified water supply target, the bypass line 110 described later, and the like are provided. There is.

The wastewater generated in the purified water supply system 1 is wastewater that is no longer needed because it is used in the purified water supply target; the purified water stays in the purified water distribution line 102 and is contaminated; the outside of the purified water Examples thereof include hot water discharged from the purified water distribution line 102 when the circulation line 100 and the purified water distribution line 102 are disinfected, a chemical solution for disinfection, and the like.

(Bypass line)
The bypass line 110 connects the first drainage introduction line 106 without passing the purified water that has passed through the purified water distribution line 102 to the purified water supply target when it is not necessary to distribute and supply the purified water to the purified water supply target. This is a line for directly supplying water to the main drainage line 104 via the main drainage line 104.
The end of the purified water distribution line 102 is detachably connected to the first end of the bypass line 110. The end of the first drainage introduction line 106 is detachably connected to the second end of the bypass line 110. When the purified water is distributed and supplied to the purified water supply target, the first end of the bypass line 110 is removed from the end of the purified water distribution line 102.

The bypass line 110 is usually composed of a flexible tube so that it can be easily attached to and detached from the end of the purified water distribution line 102 and the end of the first drainage introduction line 106.
The first end and the second end of the bypass line 110 are provided with connectors for detachably connecting the end of the purified water distribution line 102 and the end of the first drainage introduction line 106.
A sample port 118 is provided in the middle of the bypass line 110 so that a part of the purified water flowing through the bypass line 110 can be taken out for inspection.
The bypass line 110 may be provided with a solenoid valve or the like for opening and closing the bypass line 110, if necessary.

(Control means)
The control device 80 is roughly configured to include a processing unit (not shown), an interface unit (not shown), and a calendar timer (not shown).

The control device 80 starts and stops the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofilter membrane module 18, and the back-penetration membrane module 20; the purified water internal circulation line 40, the soft water transfer line 36, and the purified water transfer. Start and stop circulation of purified water to line 38; Start and stop circulation of purified water to external circulation line 100 of purified water; Start and stop discharge of retained water in purified water distribution line 102; Purified water tank 22 Start and stop heating of purified water inside; Start and stop addition of undiluted chemical solution to purified water; Start and stop supply of purified water to purified water supply target; Start and stop discharge of wastewater from purified water supply target It is possible to control the discharge stop and the like, and to perform these controls at an arbitrary date and time set in the calendar timer as needed.

The calendar timer has a clock unit that manages the date and time, and a storage unit that stores the operation schedule of the purified water production apparatus. The calendar timer is designed to be able to transmit an electric signal at a set date and time stored in the storage unit.

The interface unit electrically connects the ultraviolet lamp 24, the heater 26, the temperature sensor and the flow rate sensor, the solenoid valve and the pump provided in each line, and the processing unit.

The processing unit drives the ultraviolet lamp 24 and the heater 26, opens and closes the solenoid valves provided in each line, drives the pump, etc., based on the electric signal from the calendar timer, the operation signal input to the processing unit, and the like. It controls.

Specifically, the processing unit performs the following control, for example.
When producing purified water in the purified water production apparatus 10, the processing unit opens the electromagnetic valve 50, the electromagnetic valve 52, the electromagnetic valve 56 and the electromagnetic valve 58 in the purified water production apparatus 10, and opens the raw water pump 70 and the pressurizing pump. By driving the 72 and the pressurizing pump 74, the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofiltration membrane module 18 and the reverse osmosis membrane module 20 is started.

When the processing unit stops the production of purified water in the purified water production apparatus 10, the processing unit stops the raw water pump 70, the pressurizing pump 72 and the pressurizing pump 74 in the purified water producing apparatus 10, and causes the electromagnetic valve 50 and the electromagnetic valve. By closing 52, the electromagnetic valve 56 and the electromagnetic valve 58, the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofiltration membrane module 18 and the reverse osmosis membrane module 20 is stopped.

When the purified water is circulated in the purified water production apparatus 10, the treatment unit opens the electromagnetic valve 54 in the purified water production apparatus 10 and drives the internal circulation pump 76 to drive the purified water internal circulation line 40 and soft water. It initiates the circulation of purified water to the transfer line 36 and the purified water transfer line 38.

When the processing unit stops the circulation of purified water in the purified water production apparatus 10, the processing unit stops the internal circulation pump 76 in the purified water production apparatus 10 and closes the electromagnetic valve 54 to close the purified water internal circulation line. 40, the circulation of purified water to the soft water transfer line 36 and the purified water transfer line 38 is stopped.

The treatment unit opens the electromagnetic valve 112 in the purified water distribution line 102 and closes the electromagnetic valve 116 in the first wastewater introduction line 106 in order to constantly circulate the purified water in the purified water external circulation line 100. The external circulation pump 78 in the manufacturing apparatus 10 is constantly driven.

When discharging the accumulated water in the purified water distribution line 102, the treatment unit circulates the purified water to the purified water external circulation line 100 while driving the external circulation pump 78 in the purified water production apparatus 10. At the same time, by opening the electromagnetic valve 116 in the first drainage introduction line 106, the discharge of the accumulated water in the purified water distribution line 102 is started.

When stopping the discharge of the stagnant water in the purified water distribution line 102, the treatment unit starts the discharge of the stagnant water in the purified water distribution line 102, and then sets the electromagnetic valve 116 in the first wastewater introduction line 106. By closing, the discharge of the stagnant water in the purified water distribution line 102 is stopped.

When heating the purified water in the purified water tank 22, the processing unit starts heating the purified water in the purified water tank 22 by driving the heater 26 in the purified water production apparatus 10.

When stopping the heating of the purified water in the purified water tank 22, the processing unit stops the heating of the purified water in the purified water tank 22 by stopping the heater 26 in the purified water production apparatus 10. be.

When the chemical solution stock solution stored in the chemical solution stock solution tank 28 is added to the purified water of the purified water external circulation line 100, the processing unit drives the chemical solution stock solution adding means, that is, opens the electromagnetic valve 66 to open the chemical solution stock solution. By driving the pump 79, the addition of the chemical stock solution to the purified water of the purified water external circulation line 100 is started.

When stopping the addition of the chemical stock solution to the purified water of the purified water external circulation line 100, the treatment unit stops the chemical stock solution pump 79 and closes the electromagnetic valve 66 to purify the purified water external circulation line 100. This is to stop the addition of the undiluted chemical solution to water.

The processing unit may be realized by dedicated hardware, and the processing unit is composed of a memory and a central processing unit (CPU), and a program for realizing the functions of the processing unit is stored in the memory. The function may be realized by loading and executing.
Further, it is assumed that an input device, a display device, and the like are connected to the control device 80 as peripheral devices. Here, the input device means an input device such as a display touch panel, a switch panel, and a keyboard, and the display device means a liquid crystal display device, a CRT, or the like.

(Mechanism of action)
1. 1. In the purified water supply system 1 described above, the purified water production apparatus 10 for producing purified water and the purified water outside for circulating the purified water produced by the purified water production apparatus 10 to the outside of the purified water production apparatus 10. Since the circulation line 100 and the purified water distribution line 102 branched from the middle of the purified water external circulation line 100 are provided, the purified water produced by the purified water production apparatus can be distributed and supplied to the purified water supply target. Further, since the purified water production apparatus 10 is provided with a heating means (heater 26) for heating the purified water, the hot water obtained by heating the purified water is circulated to the purified water external circulation line 100 or the like. This makes it possible to disinfect the purified water supply system 1. Further, the purified water production apparatus 10 is provided with chemical solution stock solution adding means (chemical solution stock solution tank 28, chemical solution stock solution supply line 48, electromagnetic valve 66, check valve 68 and chemical solution stock solution pump 79) for adding the chemical solution stock solution to purified water. Therefore, the purified water supply system 1 can be disinfected by circulating the disinfectant chemical solution prepared by adding the chemical solution stock solution to the purified water to the purified water external circulation line 100 or the like. Further, disinfection is possible at all times except when the purified water is supplied, and the purified water supply system 1 can be easily disinfected.

2. Further, in the purified water supply system 1 described above, a drainage line (main drainage line 104, a first drainage introduction line 106, and a second drainage) for discharging the wastewater generated in the purified water supply system 1 to the outside. An introduction line 108) and a bypass line 110 that is detachably connected to the end of the purified water distribution line 102 and directly sends the purified water that has passed through the purified water distribution line 102 to the drainage line are further provided, so that the purified water is externally circulated. The purified water circulating in the line 100 can be flowed to the purified water distribution line 102, and the accumulated water in the purified water distribution line 102 can be discharged to the drainage line via the bypass line 110. Further, since the end of the purified water distribution line 102 is sealed by the bypass line 110 and is not in an open state, bacteria are less likely to adhere to the end of the purified water distribution line 102. As a result, the purified water distribution line 102 is less likely to be contaminated. Further, at the time of disinfection, hot water or a chemical solution for disinfection circulating in the external circulation line 100 of purified water can be flowed to the purified water distribution line 102, and disinfection is performed at a high level up to the end of the purified water distribution line 102. be able to. As a result, bacteria and endotoxin are less likely to be generated in the retained water in the purified water distribution line 102.

3. 3. Further, in the purified water supply system 1 described above, either or both of the drive of the heater 26 and the drive of the chemical stock solution addition means, and the electromagnetic valve 112 of the purified water distribution line 102 and the first drainage introduction line. Since the control device 80 for controlling the opening and closing of the electromagnetic valve 116 in the 106 is further provided, it is possible to periodically disinfect the purified water supply system 1 and discharge the accumulated water in the purified water distribution line 102.
4. Further, in the purified water supply system 1 described above, since the sample port 118 capable of taking out a part of the purified water flowing through the bypass line 110 is provided in the middle of the bypass line 110, the inside of the bypass line 110 is provided. The flowing purified water can be easily and uncontaminated. In addition, the accumulated water in the bypass line 110 can be drained. This allows us to meet the more stringent demands on pollution.

(Other embodiments)
The purified water supply system of the present invention includes a purified water production apparatus that produces purified water; a purified water circulation line that circulates the purified water produced by the purified water production apparatus to the outside of the purified water production apparatus; and a purified water circulation line. Purified water distribution line branched from the middle of the A bypass line is provided; the purified water production apparatus may be provided with either or both of a heating means for heating the purified water and a chemical solution stock solution adding means for adding the chemical solution stock solution to the purified water. , The purified water supply system 1 of the illustrated example is not limited.

For example, in the purified water supply system of the present invention, only one of the heating means for heating the purified water and the chemical solution stock solution adding means for adding the chemical solution stock solution to the purified water may be used. For example, when the heat resistance of the pipe used for the drainage line is insufficient, a chemical solution stock solution addition means is provided without providing a heating means.
Further, in the purified water supply system of the present invention, it is not always necessary to provide either or both of the driving of the heating means and the driving of the chemical stock solution addition means, and the control means for controlling the opening and closing of the purified water distribution line.
Further, in the purified water supply system of the present invention, there may be only one wastewater introduction line for introducing wastewater into the main drainage line for each purified water distribution line and the purified water supply target.
Further, in the purified water supply system of the present invention, the ultrafiltration membrane filter 90 does not necessarily have to be provided.
Further, in the purified water supply system of the present invention, two or more purified water circulation lines may be provided for one purified water production apparatus, and two or more purified water production apparatus and two or more purified water circulation lines. And may be provided.
Further, as the purified water producing apparatus, the purified water producing apparatus described in Japanese Patent No. 4990710, the purified water producing apparatus described in Patent No. 5425527, the purified water producing apparatus described in Patent No. 5582847, and the like are known. You may use the purified water production apparatus of.
Further, although only one reverse osmosis membrane module is used in the purified water production apparatus in the illustrated example, two or more reverse osmosis membrane modules may be used in parallel depending on the required amount of water.
Further, although the purified water tank in the purified water production apparatus is only one in the illustrated example, two or more may be used depending on the required amount of water.
Further, the purified water supply system of the present invention may be provided with a notification means for notifying that disinfection is in progress.
Examples of the notification means include a display on the screen of the display device of the control device 80, a display on the screen of the panel for remote control, a lamp, and the like.

<How to operate the purified water supply system>
While operating the purified water supply system of the present invention, the purified water produced by the purified water production apparatus is constantly circulated to the purified water circulation line in order to suppress the retention of purified water in the purified water circulation line. While circulating the purified water to the purified water circulation line, the accumulated water in the purified water distribution line 102 is discharged, the purified water supply system 1 is disinfected, and the purified water is distributed and supplied to the purified water supply target.
Hereinafter, the operation method of the purified water supply system 1 will be specifically described.

(Manufacturing of purified water in purified water production equipment)
When the purified water production apparatus 10 produces purified water, the processing unit of the control device 80 opens the electromagnetic valve 50, the electromagnetic valve 52, the electromagnetic valve 56, and the electromagnetic valve 58 in the purified water production apparatus 10, and the raw water pump 70. , Drive the pressurizing pump 72 and the pressurizing pump 74. As a result, the supply of raw water to the activated carbon filter 14, the check filter 16, the nanofiltration membrane module 18 and the reverse osmosis membrane module 20 is started.

The raw water supplied from the raw water tank 12 through the raw water supply line 30 is boosted by the raw water pump 70 of the raw water supply line 30 and then passed through the activated carbon filter 14. The raw water from which the residual chlorine in the raw water has been removed by the activated carbon filter 14 passes through the first raw water transfer line 32, the check filter 16 and the second raw water transfer line 34, and pressurizes the second raw water transfer line 34. After being boosted by the pump 74, it is supplied to the nanofiltration membrane module 18. A part of the raw water supplied to the nanofiltration membrane module 18 permeates the nanofiltration membrane and is softened. On the other hand, the remaining raw water that has not permeated through the nanofiltration membrane becomes concentrated water, which is discharged from the device drainage line 42 to the outside of the device through the first concentrated water discharge line 44.

The raw water softened by the nanofiltration membrane module 18 is pressurized by the pressurizing pump 74 of the soft water transfer line 36 and then supplied to the reverse osmosis membrane module 20. A part of the raw water supplied to the reverse osmosis membrane module 20 permeates the reverse osmosis membrane to become purified water, and is stored in the purified water tank 22 through the purified water transfer line 38. On the other hand, the remaining raw water that has not permeated the reverse osmosis membrane becomes concentrated water, which is discharged from the device drainage line 42 to the outside of the device through the second concentrated water discharge line 46.

(Internal circulation and sterilization of purified water in purified water production equipment)
When sterilizing while circulating purified water in the purified water production apparatus 10, the processing unit of the control device 80 opens the electromagnetic valve 54 in the purified water production apparatus 10 and drives the internal circulation pump 76 to purify the purified water. The circulation of purified water to the water internal circulation line 40, the soft water transfer line 36 and the purified water transfer line 38 is started. In addition, the ultraviolet lamp 24 in the purified water production apparatus 10 is driven.

The purified water stored in the purified water tank 22 is returned to the purified water tank 22 by the constantly driven internal circulation pump 76 via the purified water internal circulation line 40, the soft water transfer line 36 and the purified water transfer line 38. It is in a state of constant fluidity. Further, the purified water stored in the purified water tank 22 is constantly sterilized by the ultraviolet lamp 24.

(Circulation of purified water in the purified water circulation line)
Purified water is purified water produced by the purified water production apparatus 10 in order to suppress retention of purified water in the purified water external circulation line 100 even when the purified water is not distributed and supplied to the purified water supply target. It is always circulated to the external circulation line 100.

In order to constantly circulate purified water to the purified water external circulation line 100, the processing unit of the control device 80 opened the electromagnetic valve 112 in the purified water distribution line 102 and closed the electromagnetic valve 116 in the first drainage introduction line 106. In this state, the external circulation pump 78 in the purified water production apparatus 10 is driven.

(Discharge of accumulated water in the purified water distribution line)
When the accumulated water in the purified water distribution line 102 is discharged, the purified water is circulated to the purified water external circulation line 100, and the processing unit of the control device 80 causes the electromagnetic valve in the first drainage introduction line 106. By opening 116, the discharge of stagnant water in the purified water distribution line 102 is started. As a result, the accumulated water in the purified water distribution line 102 is discharged to the main drainage line 104 via the bypass line 110. After a lapse of a predetermined time, the processing unit of the control device 80 closes the solenoid valve 116 in the first drainage introduction line 106 to stop the discharge of the accumulated water in the purified water distribution line 102.

The discharge of the accumulated water in the purified water distribution line is performed based on, for example, an operation schedule stored in the storage unit of the calendar timer of the control device 80.
The frequency of discharging the accumulated water in the purified water distribution line 102 is preferably once every 30 to 180 minutes. The time for discharging the accumulated water in the purified water distribution line 102 is preferably 2 to 10 minutes each time.

(Disinfection of purified water supply system)
When disinfecting the purified water external circulation line 100, first, in the processing unit of the control device 80, the purified water outside sent from the flow sensor or the like provided in the purified water external circulation line 100 or the purified water distribution line 102. Based on the flow rate information (electrical signal) of the purified water flowing through the circulation line 100, it is determined whether or not the purified water is distributed and supplied to the purified water supply target. It can be determined that the purified water is distributed and supplied to the purified water supply target by comparing with the flow rate in the state where the purified water is not distributed and supplied. When purified water is distributed and supplied to the purified water supply target, hot water or a chemical solution for disinfection cannot flow to the purified water external circulation line 100, so that the distributed supply of purified water to the purified water supply target ends. Until then, the processing unit of the control device 80 suspends the disinfection of the purified water external circulation line 100.

When disinfecting the purified water external circulation line 100, the purified water is circulated to the purified water external circulation line 100, and after the electromagnetic valve 112 in the purified water distribution line 102 is closed by the processing unit of the control device 80. , The heater 26 in the purified water production apparatus 10 or the chemical solution stock solution adding means is driven, that is, the electromagnetic valve 66 is opened and the chemical solution stock solution pump 79 is driven to heat the purified water in the purified water tank 22. Start, or start adding the chemical solution stock solution to the purified water of the purified water external circulation line 100 to prepare a chemical solution for disinfection. As a result, hot water or a chemical solution for disinfection is circulated in the purified water external circulation line 100, and the purified water external circulation line 100 is disinfected. After a lapse of a predetermined time, the processing unit of the control device 80 stops the heating of the purified water in the purified water tank 22 by stopping the heater 26 in the purified water production device 10, or stops the chemical solution stock solution pump 79. By closing the electromagnetic valve 66, the addition of the chemical stock solution to the purified water of the purified water external circulation line 100 is stopped.

When disinfecting the purified water distribution line 102, while circulating hot water or a chemical solution for disinfection to the purified water external circulation line 100, the processing unit of the control device 80 causes the electromagnetic valve 112 and the electromagnetic valve 112 in the purified water distribution line 102 and the purified water distribution line 102. By opening the electromagnetic valve 116 in the first drainage introduction line 106, the supply of hot water or a disinfectant chemical solution to the purified water distribution line 102 is started. As a result, hot water or a chemical solution for disinfection flows into the purified water distribution line 102 and is discharged to the main drainage line 104 via the bypass line 110, so that the purified water distribution line 102 is disinfected. After a lapse of a predetermined time, the processing unit of the control device 80 closes the solenoid valve 112 in the purified water distribution line 102 and the solenoid valve 116 in the first drainage introduction line 106 to disinfect the purified water distribution line 102 with hot water. Stop the supply of chemicals.

When disinfecting the back-penetration membrane module 20 in the purified water production apparatus 10, the purified water in the purified water tank 22 is heated or the chemical stock solution is added to the purified water, and the purified water is purified by the processing unit of the control device 80. By opening the electromagnetic valve 54 in the water production apparatus 10 and driving the internal circulation pump 76, hot water or purified water for disinfection is circulated to the purified water internal circulation line 40, the soft water transfer line 36 and the purified water transfer line 38. To start. As a result, hot water or a chemical solution for disinfection is supplied to the reverse osmosis membrane module 20, and the reverse osmosis membrane module 20 is disinfected.

The purification of the purified water supply system 1 is performed based on, for example, an operation schedule stored in the storage unit of the calendar timer of the control device 80.
The frequency of disinfecting the purified water external circulation line 100 is preferably once every 2 to 7 days. The time for circulating hot water or the disinfectant chemical solution in the purified water external circulation line 100 is preferably 30 to 180 minutes each time.

The number of times the purified water distribution line 102 is disinfected is preferably 1 to 5 times while the purified water external circulation line 100 is disinfected. The time for flowing hot water or a disinfectant chemical solution through the purified water distribution line is preferably 2 to 10 minutes at a time.

The temperature of the hot water in the purified water tank 22 is determined by the processing unit of the control device 80 based on the temperature information (electric signal) of the purified water in the purified water tank 22 obtained by the temperature sensor of the purified water tank 22. Is adjusted by controlling.
The temperature of the hot water in the purified water tank 22 circulated in the purified water external circulation line 100 is preferably 80 to 97 ° C.

Examples of the chemical stock solution include an aqueous solution of sodium hypochlorite and the like.
The concentration of the chemical solution stock solution in the chemical solution stock solution tank 28 is, for example, 60,000 to 120,000 ppm in the case of an aqueous sodium hypochlorite solution.
The concentration of the disinfectant chemical solution prepared by adding the chemical solution stock solution to purified water is, for example, 1 to 2,000 ppm in the case of an aqueous sodium hypochlorite solution.

(Distribution and supply of purified water to the target of purified water supply)
FIG. 3 is a schematic configuration diagram showing a state in which a personal dialysis machine is connected to the purified water supply system of FIG. 1 as a purified water supply target.
When the purified water is distributed and supplied to the purified water supply target, the first end of the bypass line 110 is removed from the end of the purified water distribution line 102. Then, the end of the water pipe 202 of the personal dialysis machine 200 is connected to the end of the purified water distribution line 102, and the end of the drainage pipe 204 of the personal dialysis machine 200 is connected to the end of the second drainage introduction line 108. To connect.

When the purified water external circulation line 100 is provided with a temperature sensor, first, in the processing unit of the control device 80, the temperature information (electrical signal) of the purified water flowing through the purified water external circulation line 100 sent from the temperature sensor is used. Based on this, it is determined whether or not the purified water external circulation line 100 is being disinfected with hot water, and if the purified water external circulation line 100 is being disinfected with hot water, the electromagnetic valve 112 of the purified water distribution line 102 is closed. When the purified water external circulation line 100 is being disinfected with hot water, the purified water cannot be supplied to the personal dialysis apparatus 200. Therefore, the control device 80 is used until the hot water disinfection of the purified water external circulation line 100 is completed. The processing unit suspends the supply of purified water to the personal dialysis machine 200.

When supplying purified water to the personal dialysis apparatus 200, the purified water is circulated to the purified water external circulation line 100, and the purified water is supplied to the personal dialysis apparatus 200 by the processing unit of the control device 80. To start. The drainage from the personal dialysis machine 200 is discharged to the main drainage line 104 via the second drainage introduction line 108.

When the supply of purified water to the personal dialysis machine 200 is stopped, the processing unit of the control device 80 stops the supply of purified water to the personal dialysis machine 200.

(Mechanism of action)
1. 1. In the operation method of the purified water supply system 1 described above, the purified water produced by the purified water production apparatus 10 is constantly circulated to the purified water external circulation line 100 while the purified water supply system 1 is operated. Therefore, the purified water produced by the purified water production apparatus can be distributed and supplied to the purified water supply target. When disinfecting the purified water external circulation line 100 and the purified water distribution line 102, the purified water is heated by the heating means (heater 26), or the chemical solution stock solution addition means (chemical solution stock solution tank 28, chemical solution stock solution supply line 48). , Electromagnetic valve 66, check valve 68 and chemical solution stock solution pump 79), so that the chemical solution stock solution is added to the purified water, the hot water obtained by heating the purified water, or the chemical solution stock solution is added to the purified water. The chemical solution for disinfection is circulated to the purified water external circulation line 100 or the like, and the purified water supply system 1 can be disinfected.

2. Further, in the operation method of the purified water supply system 1 described above, since the purified water supply system 1 further includes a bypass line 110, the purified water circulating in the purified water external circulation line 100 is supplied to the purified water distribution line 102. It can be flushed and the accumulated water in the purified water distribution line 102 can be discharged to the drainage line via the bypass line 110. Further, since the end of the purified water distribution line 102 is sealed by the bypass line 110 and is not in an open state, bacteria are less likely to adhere to the end of the purified water distribution line 102. As a result, the purified water distribution line 102 is less likely to be contaminated. Further, at the time of disinfection, hot water or a chemical solution for disinfection circulating in the external circulation line 100 of purified water can be flowed to the purified water distribution line 102, and disinfection is performed at a high level up to the end of the purified water distribution line 102. be able to. As a result, bacteria and endotoxin are less likely to be generated in the retained water in the purified water distribution line 102.

The purified water supply system of the present invention includes facilities, devices (personal dialysis devices, etc.) that require purified water in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor device factories, etc.). It is useful as a system for supplying purified water to the factory.

1 Purified water supply system, 10 Purified water production equipment, 12 Raw water tank, 14 Activated charcoal filter, 16 Check filter, 18 Nano filter membrane module, 20 Reverse osmosis membrane module, 22 Purified water tank, 24 UV lamp, 26 Heater, 28 Chemical solution stock solution tank, 30 raw water supply line, 32 first raw water transfer line, 34 second raw water transfer line, 36 soft water transfer line, 38 purified water transfer line, 40 purified water internal circulation line, 42 drainage line for equipment, 44 1st concentrated water discharge line, 46 2nd concentrated water discharge line, 48 chemical stock solution supply line, 50 electromagnetic valve, 52 electromagnetic valve, 54 electromagnetic valve, 56 electromagnetic valve, 58 electromagnetic valve, 60 check valve, 62 reverse Stop valve, 64 Check valve, 66 Electromagnetic valve, 68 Check valve, 70 Raw water pump, 72 Pressurized pump, 74 Pressurized pump, 76 Internal circulation pump, 78 External circulation pump, 79 Chemical solution stock solution pump, 80 Control device, 90 Extrafiltration membrane filter, 100 Purified water external circulation line, 102 Purified water distribution line, 104 Main drain line, 106 First drainage introduction line, 108 Second drainage introduction line, 110 Bypass line, 112 Electromagnetic valve, 116 Electromagnetic valve, 118 sample port, 120 relay board, 122 flow sensor, 200 personal dialysis machine, 202 head pump, 204 drain pipe.

Claims (3)

Purified water production equipment that produces purified water,
A purified water circulation line that circulates the purified water produced by the purified water production apparatus to the outside of the purified water production apparatus.
A purified water distribution line branched from the middle of the purified water circulation line and
A drainage line that discharges the wastewater generated by the purified water supply system to the outside,
A purified water supply system including a bypass line that is detachably connected to the end of the purified water distribution line and directly feeds the purified water that has passed through the purified water distribution line to the drainage line. The purified water supply system according to claim 1, wherein a sample port capable of taking out a part of the purified water flowing through the bypass line is provided in the middle of the bypass line. A method of operating the purified water supply system according to claim 1 or 2.
The bypass line is connected to the end of the purified water distribution line,
A method of operating a purified water supply system in which the accumulated water of the purified water distribution line is directly sent to the drainage line via the bypass line.

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