KR19980070337A - Sewage Treatment Equipment - Google Patents

Abstract

The present invention provides a sewage treatment apparatus which can efficiently remove phosphorus by appropriately controlling the elution amount of iron ions.

An elution device for eluting iron ions or aluminum, supply means for supplying ions eluted from the elution device to a sewage treatment unit for treating sewage, and control means 40 for controlling the amount of iron ion elution of the elution device. One sewage treatment device.

Description

Sewage Treatment Equipment

The present invention relates to a sewage treatment apparatus for purifying sewage, and more particularly, to a sewage treatment apparatus for removing phosphorus from sewage.

As such a wastewater treatment apparatus, for example, Japanese Patent Laid-Open No. 3-89998 (C02F 3/12) is known.

This sewage treatment apparatus electrolyzes the iron electrode, supplies the eluted iron ions to the sewage treatment unit, reacts with orthophosphoric acid in the treated water, aggregates and precipitates as a poorly soluble phosphorus compound, and removes phosphorus from the treated water. will be.

Since the size of the sewage treatment system is prescribed by the standard for calculating the number of people to be treated in the manure septic tank according to the purpose of the building, it is not determined by the actual number of people used but by the living area.

Thus, for example, if a small number of people live in a house with a large residential area, the amount of sewage must be installed at least, and a large sewage treatment apparatus having a processing capacity of at least the number of residents must be installed, and more than the amount necessary to react with phosphorus in the sewage. Iron ions will elute.

In this case, the iron ions react with other hydroxyl groups reacting with orthophosphoric acid to become poorly soluble salts as ferric hydroxide and precipitate as sludge, and when the iron ions are excessively eluted, the sludge of ferric hydroxide is There is such a problem that the number of sludge removal increases.

An object of the present invention is to provide a sewage treatment apparatus which can efficiently remove phosphorus by appropriately controlling the amount of iron ions eluted to solve the above problems.

1 is a cross-sectional view of a wastewater treatment apparatus of a first embodiment of the present invention.

Figure 2 is a sectional view from above in different directions.

Figure 3 is a perspective view of the above fractional measuring device.

Figure 4 is an enlarged cross-sectional view of the above dissolution tank.

5 is a front view of the above switch;

6 is a control block diagram above.

Fig. 7 is a pattern diagram of a direct current applied to an electrode of a second embodiment of the present invention.

8 is a control block diagram of a third embodiment of the present invention;

Fig. 9 is a perspective view of the electrode unit of the fourth embodiment of the present invention.

10 is an exploded perspective view of the above dissolution tank.

11 is a perspective view of the above dissolution tank.

12 is a cross-sectional view of the above dissolution tank.

Figure 13 is an exploded perspective view of the above dissolution tank.

Fig. 14 shows the direct current applied to the electrode of the elution device according to the fifth embodiment of the present invention.

Pattern too.

Fig. 15 shows the direct current applied to the electrode of the elution device according to the sixth embodiment of the present invention.

Pattern too.

Fig. 16 shows the direct current applied to the electrode of the elution device according to the seventh embodiment of the present invention.

Pattern too.

Fig. 17 is an enlarged cross-sectional view of the elution tank of the eighth embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

37 elution tank

38 electrodes

39 Power Supply

40 Control means (control circuit)

43 Adjustment means (switches)

50 sensors

62 electrode unit

70 Oxidation Catalyst

The 1st means for solving the said subject is the elution apparatus which elutes an iron ion or aluminum ion, the supply means which supplies the ion eluted by this elution apparatus to the sewage treatment part which purifies sewage, and the said elution apparatus. And control means for controlling the amount of the ion elution.

The second means for solving the above problems is an eluting device for eluting iron ions or aluminum ions, a conveying means for returning the sewage of the sewage treatment unit to purify the sewage to the sewage treatment unit through the elution device; And control means for controlling the ion elution amount of the elution device.

A third means for solving the above problems is at least a pair of electrodes using iron or aluminum at least in the anode, a power supply for applying a current between the electrodes, and sewage And a conveying means for conveying the sewage of the sewage treatment unit to be purified to the sewage treatment unit through the elution tank, and a control means for controlling the applied current of the power supply device.

A fourth means for solving the above problems is at least a pair of electrodes using iron or aluminum at least in the anode, a power supply for applying a current between the electrodes, and sewage A conveying means for conveying the wastewater of the sewage treatment unit to be purified to the sewage treatment unit through the elution tank, an adjusting means for adjusting the amount of iron ions eluted from the electrode, and an applied current of the power supply device based on the output of the adjusting means It characterized in that it comprises a control means for controlling the.

The fifth means for solving the above problems is at least a pair of electrodes, which are disposed in an elution tank, and which uses iron or aluminum at least as an anode, a power supply device for applying a current between the electrodes, and sewage. A conveying means for conveying the sewage of the purified sewage treatment unit to the sewage treatment unit through the elution tank, a sensor for detecting the amount of sewage flowing into the sewage treatment unit from the toilet, and controlling the applied current of the power supply device by the output of the sensor. And control means.

A sixth means for solving the above problems is provided in the elution tank, a plurality of electrode pairs using iron or aluminum at least in the anode, a power supply for applying a current between the electrodes, and filthy water The effluent of the effluent treatment unit to be purified is transported to the effluent treatment unit through the elution tank, an adjusting means for adjusting the amount of ions eluted from the electrode, and among the plurality of electrode pairs based on the output of the adjusting means. And control means for controlling the number of electrode pairs to which an electric current is applied.

A seventh means for solving the above problems is provided in the elution tank, a plurality of electrode pairs using iron or aluminum at least in the anode, a power supply device for applying a current between the electrodes, and sewage The conveying means which conveys the sewage of the sewage treatment part to purify to the sewage treatment part through the said elution tank, the sensor which detects the amount of sewage which flows into a sewage treatment part from a toilet, and the electric current of the plurality of electrode pairs by the output of the sensor It characterized in that it comprises a control means for controlling the number of electrode pairs to apply.

Eighth means for solving the above problems is provided in the elution tank, a plurality of electrode pairs using iron or aluminum at least in the anode, a power supply device for applying a current between the electrodes, and sewage From the plural electrode pairs based on the output of the conveyance means which conveys the filthy water of the wastewater processing part to purify to the wastewater processing part through the said elution tank, the amount of ions eluted from the said electrode, and the output of the adjustment means. Control means for controlling the number of electrode pairs for applying a current and changing the electrode pairs for applying a current every predetermined time is provided.

A ninth means for solving the above problems is provided in the elution tank, a plurality of electrode pairs using iron or aluminum at least in the anode, a power supply device for applying a current between the electrodes, and sewage Sewage treatment unit for purifying sewage from the sewage treatment unit to the sewage treatment unit through the elution tank, a sensor for detecting the amount of sewage flowing into the sewage treatment unit from the toilet, and from among the plurality of electrode pairs based on the output of the sensor. Control means for controlling the number of electrode pairs for applying a current and changing the electrode pairs for applying a current every predetermined time is provided.

A tenth means for solving the above problems includes an elution tank in which a terminal is fed from a power supply device for applying a current, and at least a pair of electrodes using iron or aluminum at an anode. And freely mounted and separated in the elution tank, and returning the sewage treatment unit to the sewage treatment unit through the elution tank, the electrode unit provided with the terminal mounted on the terminal by mounting to the elution tank, and the sewage treatment unit for purifying sewage. It is characterized by comprising a conveying means.

In the above-mentioned first to tenth means,

In the elution tank, it is preferable to include a control means for disposing an electrode made of iron or aluminum at the anode and applying a current for switching polarity at every predetermined time between the electrodes.

In the above-mentioned first to tenth means,

It is preferable to provide a control means for applying a current in which the applied current increases in a pulse state at predetermined intervals between the electrodes.

In the above-mentioned first to tenth means,

In the elution tank, an electrode made of iron or aluminum is disposed in the anode, and control means is provided between the electrodes to switch the polarity of the electrode at predetermined time intervals and to apply a current in which the applied current increases in a pulsed state. It is desirable to.

In the first to tenth means,

In the elution tank, it is preferable to include an aeration device for washing the electrode.

In the first to tenth means,

It is preferable to provide an oxidation catalyst which oxidizes the eluted ion in an elution tank.

Embodiment of the Invention

A first embodiment of the present invention will be described below in detail on the basis of the sewage treatment apparatus shown in Figs.

1 is a tank buried underground.

The inside of the tank 1 is formed by the first partition wall 2, the second partition wall 3, and the third partition wall 4, by the first anaerobic bottom tank 5 and the second described later. The anaerobic furnace is partitioned into a bottom tank 10, a contact aeration tank 14, a settling tank 19, and a disinfection tank 21.

5 is a first anaerobic bottom tank having an inlet 6 through which live wastewater flows, 7 is a first anaerobic floor, which is disposed in the first anaerobic bottom tank 5, Precipitate and decompose the hardly decomposable miscellaneous mixed in the living wastewater introduced into the bottom tank 5, and anaerobic decomposition of organic matter by anaerobic microorganisms attached to the plug 7 of the first anaerobic.

The organic nitrogen is anaerobicly decomposed with ammonia nitrogen.

8 is a first mobile flow pipe, which will be described later through the first water supply port 9 penetrating the upper part of the first partition wall 2 to the treated water anaerobicly treated in the bottom tank 5. It is supplied to the bottom tank 10 by a 2nd anaerobic.

10 denotes a second tank divided into a first tank by the first partition wall 2 and a bottom tank 5, and 11 denotes a second tank installed in the bottom tank 10 by the second reactor. As a plug, the second anaerobic plug 11 catches suspended matter, anaerobicly decomposes organic matter by anaerobic microorganisms, and simultaneously decomposes organic nitrogen into ammonia nitrogen.

Reference numeral 12 is a second mobile flow pipe, and the treated water anaerobicly decomposed in the bottom tank 10 by the second anaerobic tube through the second water supply port 13 penetrating through the second partition wall 3 will be described later. Water is supplied to the aeration tank 14.

Reference numeral 14 denotes a contact aeration tank partitioned from the second anaerobic bottom tank 10 by the second partition wall 3, wherein the treated water anaerobicly treated in the second anaerobic bottom tank 10 is transferred to the second mobile flow pipe 12. Inflow through.

15 is a contact material provided in the contact aeration tank 14, and promotes culture of aerobic microorganisms.

16 is a first acid engine disposed at the bottom of the contact aeration tank 14, and forms a plurality of air outlets, and is connected to the first blower 17 and supplied from the first blower 17. The aerated air is discharged from the air outlet to maintain the aeration in the contact aeration tank 14, and the treated water is aerobicly decomposed by aerobic microorganisms, and ammonia nitrogen and nitric acid are removed by the action of nitric acid bacteria or nitrite bacteria. Decomposes into nitrogen.

18 is disposed below the contact member 15 and is connected to the first blower 17 as a second diffuser having a plurality of air outlets.

The air supply from the first blower 17 can be switched by a switching valve (not shown) on either the first diffuser 16 or the second diffuser 18.

In general, the switching valve is switched to the first diffuser 16 to discharge air supplied from the first blower 17 from the air discharge port of the first diffuser 16 to exhale inside the contact aeration tank 14. When the contact material 15 is cleaned, the air supply of the first blower 17 is switched to the second acid pipe 18, and the air is discharged from the air outlet of the second acid pipe 18 to contact After attaching to and propagating to the ash 15, the thickened biofilm is gradually peeled off.

19 is a sedimentation tank partitioned from the contact aeration tank 14 by the third partition wall 4, and is provided at the bottom of the third partition wall 4 to allow the contact aeration tank 14 and the settling tank 19 to be connected in series. In the contact aeration tank 14 flowing from the communication port 20, the aerobic decomposed treated water is separated into a precipitate and an upper layer liquid.

Further, in order to return the deposit deposited on the bottom of the settling tank 19 to the contact aeration tank 14 from the communication port 20, the bottom of the settling tank 19 is inclined toward the contact aeration tank 14 side.

21 is a disinfection tank provided in the upper part of the settling tank 19, and the upper liquid cleaning liquid separated from the settling tank 19 flows in.

22 is a sterilization apparatus installed in the disinfection tank 21, and disinfects the treated water flowing into the disinfection tank 19 by chemicals such as chlorine in the sterilization apparatus 22, and disinfects it through the drain 23. The treated water is drained out of the tank 1.

24 is a first return pipe which connects the bottom of the contact aeration tank 14 and the upper part of the bottom tank 5 to the first anaerobic one after another.

25 is a third diffuser disposed in the first conveying pipe 24, which forms a plurality of air discharge ports and is connected to the second blower 26 to supply air from the second blower 26. The sludge deposited at the bottom of the contact aeration tank 14 and the precipitate returned to the contact aeration tank 14 from the settling tank 19 by discharging the air from the air outlet port are sucked into the first conveying pipe 24 to bottom It is supposed to return to the tank (5).

27 is a 2nd conveying pipe which connects the said settling tank 19 and the inflow chamber 30 of the water fountain measuring apparatus 29 mentioned later.

28 is a fourth diffuser disposed in the second conveying pipe 27, which forms a plurality of air outlets and is connected to the second blower 26, and the air from the second blower 26 is The supply can be switched by a switching valve (not shown) on either the third diffuser 25 or the fourth diffuser 28.

The changeover valve is generally switched to the fourth acid engine 28 and discharges a predetermined amount of air supplied from the second blower 26 at the air discharge port of the fourth acid engine 28, so that the settling tank 19 is provided. A predetermined amount of the upper layer cleaning liquid in the gas is sucked into the second conveying pipe 27 and transferred to the inflow chamber 30 of the fractional metering device 29 which will be described later.

After the contact material 15 has been cleaned, the air supply from the second blower 26 is switched to the third acid engine 25 so that the air is discharged from the air outlet of the third acid engine 25, thereby making contact with it. The treated water in the aeration tank 14 passes through the first conveying pipe 24 and flows into the bottom tank 5 as the first anaerobic vessel.

According to this flow, the sludge deposited on the bottom of the contact aeration tank 14 and the sedimentation tank 19 returned to the contact aeration tank 14 are sucked into the first conveying pipe 24 and the bottom tank 5 as the first anaerobic tank 5. Return to).

29 is a rectangular box-type fractional metering device arranged on the upper part of the settling tank 19, and the amount of supply flow to the elution tank 37 (to be described later) of the upper layer cleaning liquid transferred by the second conveying pipe 27. It is supposed to adjust.

The fountain measuring device 29 includes an inlet chamber 30 in contact with the second conveying pipe 27, an intermediate chamber 32 partitioned by the inlet chamber separating wall 31, and an intermediate chamber 32. It is divided into the 1st fountain chamber 33 and the 2nd fountain chamber 34 which flow in inflowed process water.

The first fountain chamber 33 is in communication with the elution tank 37 (to be described later), and is in communication with the intermediate chamber 32 by a cutting part 35 having an upper portion of the wall opened in a V shape. .

The second fountain chamber 34 is connected to the upper portion of the contact aeration tank 14 and is also connected to the intermediate chamber 32 through an opening formed in the upper portion of the over-flop plate 36 whose height can be adjusted.

The size of the opening formed in the upper portion of the over-flop plate 36 by adjusting the height of the over-flop plate 36 with a predetermined amount of treated water supplied from the second conveying pipe 27 to the fountain measuring device 29. To adjust the amount of water flowing into the elution tank 37 from the first fountain chamber 33 to a predetermined amount by setting the amount of water to be conveyed from the second fountain chamber 34 to the contact aeration tank 14. It is.

37 is a rectangular box-type elution tank into which a predetermined amount of treated water in the first fountain chamber 33 flows. In the elution tank 37, four pairs of electrodes 38 made of iron material (electrode A, electrode B, electrode C, and electrode D) are attached.

39 is a power supply for supplying a DC constant current to the electrode 38, 40 is the first blower 17, the second blower 26, the power supply 39 and a third blower (to be described later). (42) is a control circuit for controlling the light.

By applying the DC constant current supplied from the power supply device 39 to the four pairs of electrodes 38, iron ions are eluted from each electrode 38 and iron ions are supplied to the treated water introduced into the elution tank 37. do.

The elution tank 37, the electrode 38, and the power supply device 39 constitute an elution device.

41 is disposed at the bottom of the elution tank 37 and is connected to the third blower 42 as a fifth diffuser having a plurality of air discharge ports.

The third blower 42 is required to clean sludge and the like attached to the electrode 38 of the elution tank 37 and to oxidize the divalent iron ions eluted from the electrode 38 to trivalent iron ions. Minimum air supply is provided.

43 is a switch for adjusting the amount of iron ion elution. The control circuit 40 adjusts the position of the contractor by turning the knob 44 of the switch 43 to the position of the number equal to the number of people actually used. The current value applied to the electrode 38 is controlled by the number adjusted by the switch 43, so as to control the amount of iron ion elution that is suitable for the actual number of people.

46 is a third conveying pipe having an opening in the upper part of the elution tank 37 and the first anaerobic bottom tank 5, and removes treated water containing iron ions eluted in the elution tank 37. In order to convey to the bottom tank 5 by 1 anaerobic, it inclines to the bottom tank 5 side by the 1st anaerobic chamber.

47 is a first manhole installed at a position corresponding to the first tank bottom 5 and the second tank bottom 10 above the first partition wall 2, and the first tank bottom tank. (5) and the second anaerobic furnace to open and close the suction sludge deposited at the bottom of the bottom tank 10 by suction.

48 is a second manhole provided at a position corresponding to the elution tank 37, and is to be opened and closed when the electrode 38 is replaced.

49 is a third manhole provided at a position corresponding to the sterilizing device 22, and is open and closed when the chlorine disinfectant is supplied to the sterilizing device 22. As shown in FIG.

Thus, domestic wastewater discharged from the household flows into the bottom tank 5 as the first anaerobic at the inlet 6.

The first anaerobic plug 7 removes relatively large and large solids such as toilet paper in domestic wastewater and garbage, and performs preliminary treatment so as to smoothly process in each treatment tank to be introduced later. The removed solids, the garbage and the sewage passing through the first anaerobic plug (7) are anaerobicly decomposed by the action of anaerobic microorganisms, the BOD is reduced, and the sludge resulting from the decomposition of the sewage is the bottom of the first anaerobic tank ( It is deposited at the bottom of 5). The organic nitrogen is anaerobicly decomposed into ammonia nitrogen.

The treated water which was anaerobicly decomposed in the bottom tank 5 by the new living wastewater flowing into the bottom tank 5 into the first anaerobic tank is the first water supply port 9 of the first mobile flow pipe 8. Inflow into the bottom tank 10 in the second anaerobic).

The treated water introduced into the bottom tank 10 by the second anaerobic anaerobic decomposition of organic matter by the action of anaerobic microorganisms in the second anaerobic plug 11 reduces the BOD and sludge generated by the decomposition of sewage. It deposits in the bottom tank 10 by 2nd anaerobic.

The organic nitrogen is anaerobicly decomposed into ammonia nitrogen.

By the new treated water flowing into the bottom tank 10 by the second anaerobic treatment, the treated water anaerobicly decomposed by the second anaerobic plug 11 is contacted by the second water supply port 13 of the second mobile flow pipe 12. It flows into the aeration tank 14.

The treated water flowing into the contact aeration tank 14 is stirred while the air supplied from the first blower 17 is discharged from the air outlet of the first acid engine 16.

Oxygen is dissolved in the treated water by the supply of air, and aerobic microorganisms attached to the surface of the contact material 15 effectively decompose the treated water, and at the same time, orthophosphoric acid may be used. And ammonia nitrogen to nitrate or nitrite nitrogen.

In addition, sludge generated by decomposition of sewage is deposited at the bottom of the contact aeration tank 14.

The treated water aerobicly decomposed by the action of aerobic microorganisms attached to the contact material 15 by the new treated water flowing into the contact aeration tank 14 is settled at the communication port 20 at the bottom of the contact aeration tank 14. Flows into.

The treated water flowing into the settling tank 19 is settled in the settling tank 19 while the settling material settles and returns from the communication port 20 to the contact aeration tank 14, and the upper layer of the clean liquid is transferred to the sterilizing tank 21. Inflow.

The upper cleaning liquid flowing into the sterilization tank 21 is disinfected by a disinfection device 22 equipped with a chlorine-based chemical, kills bacteria such as pathogens, and is drained out of the tank 1 by the drain port 23.

By discharging a predetermined amount of air from the air outlet of the fourth diffuser 28, the predetermined amount of treated water in the settling tank 19 flows into the inflow chamber 30 of the fountain measuring device 29, and the intensive chamber 32 ) Is rectified and flows into the first fountain chamber 33 and the second fountain chamber 34.

And while adjusting the height of the overflux plate 36, the size of the opening formed in the upper part of the overflux plate 36 which connects the 2nd fountain chamber 34 and the intermediate chamber 32 in a row is changed, and the 2nd Since the amount of the treated water conveyed from the fountain chamber 34 to the contact aeration tank 14 is determined, the treated water flowing into the elution tank 37 from the first fountain chamber 33 is adjusted to a predetermined amount.

Iron ions eluted from the electrode 38 are supplied to a predetermined amount of treated water flowing into the elution tank 37 by applying a direct current constant current between the electrodes 38 made of iron.

In addition, the sludge in the elution tank 37 is discharged while the air supplied from the third blower 42 is discharged from the air outlet of the fifth acid pipe 41 to stir the treated water introduced into the elution tank 37. The divalent iron ions eluted from the electrode 38 are ortho-prevented by attaching to the surface of the electrode 38 to prevent the iron ion elution efficiency from being lowered and using oxygen in the air supplied from the third blower 42. It is possible to oxidize to trivalent iron ionic acid reacting with phosphoric acid, thereby improving the dephosphorization efficiency.

The trivalent iron ion in the elution tank 37 reacts with orthophosphoric acid present in the treated water, aggregates and precipitates as a poorly soluble phosphorus compound, and at the bottom of the first anaerobic vessel by the third conveying pipe 46. It is conveyed to the tank 5.

Trivalent iron ions in the treated water returned to the bottom tank 5 with the first anaerobic reaction react with orthophosphoric acid present in the bottom tank 5 with the first anaerobic coagulation and precipitate with a poorly soluble phosphorus compound.

In addition, the nitrate and nitrite nitrogen in the treated water returned to the bottom tank 5 by the first anaerobic gas are reduced by denitrifying bacteria present in the bottom tank 5 in the first anaerobic tank 5, and the nitrogen gas is removed in the air as nitrogen gas. Dissipated and removed.

The treated water returned from the elution tank 37 to the first anaerobic tank 5 is supplied from the settling tank 19, not from the contact aeration tank 14 with extremely high dissolved oxygen concentration. Since only the amount of air necessary for oxidizing the divalent iron ions eluted in (37) to trivalent iron ions is supplied from the third blower 42 by the fifth acid engine, the treated water in the elution tank 37 is removed. Even if it is returned to the bottom tank 5, the effect on anaerobic microorganisms is small, and anaerobic treatment can be performed.

When a small number of people live in a large house with a large residential area, a sewage treatment device having a phosphorus removal performance more than the number of residents is installed, and excessively eluted iron ions react with orthophosphoric acid and react with a hydroxyl group as ferric hydroxide. Since it becomes a poorly soluble salt and precipitates as sludge, there exists a problem of the sludge removal frequency increasing.

So, in this embodiment, the electrode 38 (four pair electrodes in this embodiment) of the quantity of iron corresponding to the calculation standard of the number of people to be processed of the manure septic tank according to the use of a building material (8 persons in this embodiment). Is placed in the elution tank 37.

Since the amount of iron ions eluted from the electrode 38 changes in proportion to the current value applied to the electrode 38, as shown in FIGS. 5 and 6, the contractor turns the knob 44 of the switch 43. When the guide 45 of the handle 44 is set to the position of the number equal to the actual number of people, the DC current value that the control circuit 40 applies to each electrode 38 by the number selected by the switch 43 is obtained. By controlling the amount of iron ions eluting the amount corresponding to the actual number of people.

For example, in the case of eight families, by turning the knob 44 of the switch 43 to align the guide 45 of the knob 44 with the display portion of eight, the control circuit 40 is connected to each electrode 38. The DC current to be applied is controlled to a current value (about 1 to 1.2 A in the present embodiment) that elutes iron ions in an amount corresponding to phosphorus discharged from eight families.

In addition, in the case of four families, when the instruction | indication 45 of the switch 43 is matched with the display part of 4, the control circuit 40 will have the amount of the DC current applied to each electrode 38 corresponding to four families. By controlling the current value of eluting iron ions (about 0.5 to 0.6 A of the half in the case of 8 persons in this embodiment), the occurrence of sludge of ferric hydroxide is prevented due to excessive elution of iron ions. The power consumption can be reduced.

Moreover, regardless of the number selected by the switch 43, since the same current is supplied to each of the four pairs of electrodes 38, the four pairs of electrodes 38 are reduced almost uniformly so that each electrode can be exchanged simultaneously. Maintenance and repair can be facilitated.

If the use of the sewage treatment device is continued, the biofilm attached to the contact material 15 grows and gradually thickens, so that the air supply from the first blower 17 is prevented from being plugged into the second acid to prevent plugging. The engine 18 is switched to release the air from the air outlet of the second acid engine 18 so as to peel off the biofilm.

The exfoliated biofilm is deposited at the bottom of the contact aeration tank 14, so that the air supply from the second blower 26 is switched to the third acid engine 25 so that the air outlet of the third acid engine 25 is discharged. When the air is discharged from the water, the treated water in the first transport pipe 24 rises in the first transport pipe 24 and flows into the bottom tank 5 as the first anaerobic reactor.

In accordance with this flow, the sludge deposited on the bottom of the contact aeration tank 14 and the precipitate returned to the contact aeration tank 14 from the settling tank 19 are sucked into the first conveying pipe 24 and returned to the bottom of the first anaerobic tank. )do.

In addition, in the first embodiment, iron is used for both electrodes as an electrode for applying a direct current constant current to elute iron ions. However, iron is used for the electrode on the anode side, and titanium or platinum is used for the electrode on the cathode side. Even if it is made of such an insoluble material, the above-described iron ion elution amount control can be performed.

In the first embodiment, the amount of iron ion elution is controlled by controlling the current value applied to each electrode 38 in accordance with the adjustment by the switch 43. However, as in the second embodiment shown in FIG. By the operation of 43, the control circuit 40 controls the amount of iron ion elution by controlling the number of electrode pairs to apply current in the four pairs of electrodes 38 (electrode A, electrode B, electrode C, electrode D). A configuration may be made.

In this configuration, the contractor adjusts the amount of the iron ion elution corresponding to the number of people to be used by the switch 43 operation as in the first embodiment.

For example, when the guide 45 of the switch 43 is aligned with the indication of 4, the control circuit 40 selects two pairs of electrodes from four pairs of electrodes, and between the electrodes A and B between a and b. , between b-c between electrode B and electrode C, c-d between electrode C and between electrode D, d-e between electrode D and electrode A, between e-g 1 to 1.2 A) is applied to elute the iron ions in an amount corresponding to the four family, thereby preventing the occurrence of sludge of ferric hydroxide due to the excessive iron ions and reducing the power consumption. You can also expect.

Since the four pairs of electrodes are reduced substantially uniformly to simultaneously exchange each electrode, the number of pairs of two-phase electrodes to which a DC constant current is applied is changed regularly every predetermined time, so that the four pairs of electrodes 38 Control is performed so that the amount of current to be applied is almost equal.

In addition, when the instructions 45 of the switch 43 are aligned with the indication of 8, a DC constant current of about 1 to 1.2 A is applied to each of the four pairs of electrodes 38, whereby positive iron ions corresponding to eight families are applied. To elute.

8 shows a third embodiment.

Since most of the phosphorus flowing into the sewage treatment apparatus was contained in the urine discharged from humans, it is converted into a switch 43 for adjusting the amount of iron ion elution provided in the first and second embodiments, and discharged from the toilet. The sensor 50 which detects a wastewater discharge amount is installed in the piping of a toilet, and it is set as the structure which controls the iron ion elution amount according to the wastewater amount which the sensor 50 detected.

As a sensor for detecting the amount of sewage, it is preferable to use an electromagnetic flowmeter or the like which can measure the flow rate in a non-contact manner.

With this configuration, the amount of sewage discharged from the toilet is detected by the sensor 50, and the control circuit 40 calculates the total amount of sewage discharged from the toilet in one day.

Since the amount of sewage discharged from the toilet by a person is about 50 liters per day, for example, if the total amount of sewage discharged from the toilet is about 200 liters per day, the amount of control circuit 40 corresponds to four families. By supplying iron ions to the sewage, it is possible to supply the optimum amount of iron ions to the sewage according to the actual number of people, and to automatically prevent the sludge of ferric hydroxide caused by the excessive leaching of iron ions, It is possible to prevent the fall of phosphorus removal efficiency due to lack of hot elution amount.

As the method of eluting iron ions, the method of controlling the DC constant current value applied to each electrode 38 as in the first embodiment described above, or the number of electrode pairs applying DC constant current as in the second embodiment. You can use the control method such as.

9 to 13 show a fourth embodiment.

51 denotes an electrode made of steel, and 52 denotes a lower electrode cover formed of an insulator, and maintains a gap between the pair of electrodes 51.

53 is a screw that fixes the electrode 51 to the lower electrode cover 52.

54 is a terminal of the electrode 51, which is a connector A 56 disposed on the protrusion 55 formed at one end of the lower electrode cover 52, and a connector B (located at the other end thereof to face the connector A 56). 57 is connected to a power supply cord 58.

59 is an upper electrode cover formed of an insulator covering the lower electrode cover 52. The convex portion 60 is provided on the side where the connector A 56 is disposed, and the connector B 57 is disposed on the side where the connector B 57 is disposed. A concave portion 61 facing the convex portion 60 is provided and fixed to the lower electrode cover 52 by a method such as ultrasonic welding.

The electrode unit 62 is constituted by the pair of electrodes 51, the lower electrode cover 52, the upper electrode cover 59, and the like.

63 is a power supply unit mounted in the elution tank 37, and forms a recess 64 having the same shape as the recess 61 formed in the upper electrode cover 59, and at the same time, the bottom of the recess 64. In the same manner as the connector B 57, the connector C 65 fed from the power supply 39 is arranged.

66 is a lid made of an insulating material having a convex portion 67 opposite the recessed portion 61.

Mounting of the electrode unit 62 to the elution tank 37 inserts the convex part 60 of the pair of electrode unit 62 into the recessed part 64 of the power supply part 63, and attaches the electrode unit 62 to it. At the same time, the connector C 65 and the connector A 56 are connected.

The connector A 57 of the next electrode unit 62 is sequentially connected to the connector B 57 of the attached electrode unit 62, and the four pairs of electrode units 62 are electrically connected. It attaches to the tank 37.

In addition, since the connector B 57 of the last electrode unit 62 is exposed and there is a risk of electric shock, the convex portion 67 of the lid body 66 is recessed 61 of the electrode unit 62. It is attached to and protected.

Again, the elution tank 37 is covered with the lower electrode cover 52, the upper electrode cover 59, and the lid 66 of each electrode unit 62 to prevent dust or the like from entering the elution tank 37. Doing.

In addition, 68 is a hole provided in the elution tank 37, and discharge | releases hydrogen gas etc. which generate | occur | produced in the elution tank 37 by electrolysis of the electrode 51. Moreover, in FIG.

According to the configuration of the fourth embodiment, since the electrode units 62 can be mounted to the elution tank 37 independently of each other, the electrode unit attached to the elution tank 37 at the time of installation of the sewage treatment apparatus ( The amount of iron ions eluted can be controlled by the number of 62).

For example, in the case of 8 families, DC constant current (approximately 1 to 1.2 A) is applied to the four pairs of electrode units 62 as they are by using all four pairs of electrode units 62 previously mounted. The amount of iron ions corresponding to the extended family is eluted.

In addition, in the case of four family members, at the time of installation of the sewage treatment apparatus, two pairs of electrode units 62 are removed from the elution tank 37, and in order to prevent dust or the like from entering the elution tank 37, A cover 69 having a structure in which the electrode 51 is removed from the unit 62 is attached to the elution tank 37.

When a direct current constant current (about 1 to 1.2 A) is applied to the pair of electrode units 62 mounted on the elution tank 37, iron ions corresponding to four families can be eluted. It is possible to prevent sludge generation of ferric hydroxide due to excessive dissolution of hot water and to reduce power consumption.

In the first to fourth embodiments described above, when the electrodes 38 and 51 made of iron are immersed in the treatment procedure in the elution tank 37 for a long time, an oxide film is formed on the electrode surface. In the passivation state, elution of iron ions gradually decreases and dephosphorization performance decreases.

Therefore, as in the fifth embodiment shown in Fig. 14, it is preferable that a current is applied between a pair of iron electrodes, and the current is changed in polarity every predetermined time.

An oxide film is generated on the iron surface on the anode side if used for a long time, but the iron surface on the cathode side is cleaned by hydrogen gas generated in the cathode steel, and no oxide film is formed.

Therefore, an oxide film is formed on the iron surface on the anode side, and the polarity can be switched at a time interval until the elution of iron ions is reduced, so that the elution of iron ions can be maintained almost constant, and the dephosphorization performance is kept constant. It can be maintained.

In this configuration, since the two electrodes are made of iron and iron ions are eluted from the iron which is always the anode side electrode and supplied to the treated water, the dephosphorization performance can always be kept constant.

In the above fifth embodiment, a DC constant current of 1 to 1.2 A is applied.

In addition, the time interval for switching the polarity of the electrode should be at least about 4 minutes when the actual dissolution amount is about 90% or more with respect to the iron ion dissolution theory, and within 2 months when the oxide film is formed on the iron surface. In order to improve the durability of the electrode and to prevent only the iron material serving as the anode side electrode from being reduced by the iron ion eluting to make the two electrodes almost uniformly reduced, within one week, preferably within one day, In this embodiment, the polarity is switched every four hours.

Also, as in the sixth embodiment shown in Fig. 15, a DC material is applied between two electrodes by using an iron material at least on the anode side, and the applied current is increased in a pulsed state every predetermined time. You may make it.

In this configuration, the oxide film generated on the surface of the anode side of the iron can be peeled off by increasing the applied current in a pulsed state, and the elution of iron ions can be kept almost constant, so that the dephosphorization performance can be kept constant.

In the sixth embodiment described above, a DC constant current of 1 to 1.2 A is applied and a pulse current of 3 to 4 A is applied for a total of 24 minutes per 4 hours.

Then, by combining the configurations of the fifth and sixth embodiments described above, as in the seventh embodiment shown in Fig. 16, a direct current constant current is applied between a pair of steel electrodes, and the current is polarized every predetermined time. At the same time, the switching current may be increased in a pulse state.

If the time until the polarity change is long, an oxide film is formed on the iron surface on the anode side, and the polarity can be changed so that the oxide film can be washed off with hydrogen gas and the oxide film is peeled off, but until the oxide film is peeled off. Since some time is required and the electrical resistance until the oxide film is peeled off is large, power consumption may increase.

Therefore, the above structure allows the oxide film on the iron surface switched from the positive electrode to the negative electrode to be removed in a short time while increasing the applied current in a pulse state, thereby preventing an increase in power consumption.

In the seventh embodiment, it is preferable to set the polarity switching time, the applied current, the time for increasing the applied current, and the like, in the same manner as described in detail in the fifth and sixth embodiments.

As described above, in the first to seventh embodiments, the fifth acid pipe 41 is provided in the elution tank 37 to oxidize the eluted iron ions from divalent to trivalent. As in the eighth embodiment shown, the oxidation catalyst 70 (titanium oxide photocatalyst, etc.) may be arranged in the elution tank 37.

In this arrangement, the divalent iron ions eluted from the electrode 38 are oxidized to trivalent iron ions by the oxidation catalyst 70 without increasing the dissolved oxygen amount of the treated water flowing into the elution tank 37. As a result, the anaerobic treatment efficiency in the bottom tank 5 can be improved without changing the phosphorus removal performance.

In the first to eighth embodiments, iron is used for the electrode, but aluminum may be used.

With this arrangement, the number of sludge removal can be reduced by preventing the generation of insoluble aluminum hydroxide due to excessive dissolution of aluminum ions, and at the same time, the deterioration of the surrounding environment caused by the excess of the eluted aluminum ions discharged out of the sewage treatment apparatus. Can be prevented.

According to the structure of claim 1 of the present invention, by controlling the ion elution amount by the control means and supplying the eluted ions to the sewage treatment part by the supply means, the number of times of removal of sludge can be reduced, and power consumption can be reduced. It is possible to achieve such effects.

According to the configuration of claim 2 of the present invention, the amount of ion elution is controlled by the control means, and the eluted ions are supplied to the sewage treatment part together with the sewage supplied by the conveying means, so that the phosphorus path and the sewage treatment part Can be removed, and the dephosphorization efficiency can be improved.

In addition, the number of times of elimination of sludge can be reduced, and power consumption can be reduced.

According to the configuration of claim 3 of the present invention, the amount of ion elution is controlled by controlling the current applied to the electrode, and the eluted ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means, Since phosphorus can be removed, dephosphorization efficiency can be improved.

In addition, since the number of times of elimination of sludge can be reduced, the effect of reducing the power consumption is exhibited.

According to the structure of claim 4 of the present invention, the amount of ion elution is controlled by controlling the current value applied to the electrode based on the output of the adjusting means, and the eluted ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means. It is possible to remove phosphorus from the conveying path and the sewage treatment unit, thereby improving the dephosphorization efficiency.

In addition, since the number of times of elimination of sludge can be reduced, the power consumption can be reduced.

According to the configuration of claim 5 of the present invention, the elution amount of ions is controlled by controlling the current value applied to the electrode in accordance with the output of the sensor, and the eluted ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means. Phosphorus can be removed from the conveying path and the sewage treatment unit, and the dephosphorization efficiency can be improved.

In addition, since the number of times of elimination of sludge can be reduced, the power consumption is reduced.

According to the constitution of claim 6 of the present invention, the amount of ion elution is controlled by controlling the number of electrode pairs to which an electric current is applied based on the output of the adjusting means, and the eluted ions together with the sewage supplied by the conveying means, together with the sewage treatment unit. Since it is supplied with, it is possible to remove the phosphorus in the conveying path and the wastewater treatment unit, it is possible to improve the dephosphorization efficiency.

In addition, it can reduce the number of sludge removal, it can reduce the power consumption, and the like.

According to the configuration of claim 7 of the present invention, the amount of ion elution is controlled by controlling the number of electrode pairs to which an electric current is applied in accordance with the output of the sensor, and the eluted ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means. Therefore, the phosphorus can be removed from the conveying path and the wastewater treatment unit, and the dephosphorization efficiency can be improved.

In addition, the number of sludge removal can be reduced, power consumption can be reduced, and the like.

According to the structure of Claim 8 of this invention, while controlling the number of electrode pairs which apply an electric current according to the output of an adjustment means, it changes the electrode pairs which apply an electric current every predetermined time, and controls the elution amount of ions, and elutes, One ion is supplied to the sewage treatment unit together with the sewage supplied by the conveying means, so that phosphorus can be removed from the conveying path and the sewage treatment unit, and the dephosphorization efficiency can be improved.

In addition, the number of sludge removal can be reduced and power consumption can be reduced.

Moreover, since each electrode decreases substantially uniformly, it becomes possible to exchange each electrode simultaneously, and the effect of making maintenance and repair easy is exhibited.

According to the structure of Claim 9 of this invention, while controlling the number of electrode pairs which apply an electric current according to the output of a sensor, the elution amount of ion is controlled and eluted by changing the electrode pairs which apply an electric current every predetermined time. Since ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means, phosphorus can be removed from the conveying path and the sewage treatment unit, thereby improving the dephosphorization efficiency.

In addition, the number of sludge removal can be reduced, and power consumption can be reduced.

Moreover, since each electrode is reduced almost uniformly, each electrode can be exchanged at the same time, thereby making it easy to repair / repair.

According to the constitution of claim 10 of the present invention, the amount of ion elution is controlled by the electrode unit water attached to the elution tank, and the eluted ions are supplied to the sewage treatment unit together with the sewage supplied by the conveying means. It is possible to remove phosphorus in the, it is possible to improve the dephosphorization efficiency.

In addition, the number of sludge removal can be reduced, and power consumption can be reduced.

According to the configuration of claims 1 to 10 of the present invention, since the two electrodes are reduced almost uniformly due to polarity switching, the two electrodes can be exchanged at the same time, thereby making it easy to repair / repair.

According to the structure of Claims 1-10 of this invention, since the oxide film which generate | occur | produced on the anode side iron surface can be peeled off by a pulse electric current, phosphorus can be removed while preventing a decrease in ion elution amount, and reducing power consumption. And so on.

According to the structure of Claims 1-10 of this invention, the oxide film which generate | occur | produced on the iron surface of an anode side by a pulse current can be peeled off, and the fall of ion elution is prevented, and the two electrodes are almost uniform by polarity switching. As a result, the two electrodes can be exchanged at the same time, thereby facilitating maintenance and repair.

According to the configuration of claims 1 to 10 of the present invention, it is possible to prevent sludge and the like from adhering to the electrode surface by the aeration device, and to easily oxidize ions using oxygen of the aeration device, thereby improving dephosphorization efficiency. And the like.

According to the structure of Claims 1-10 of this invention, since an ion catalyst can be oxidized efficiently, an effect, such as improving a dephosphorization efficiency, is exhibited.

Claims (10)

An elution device for eluting iron ions or aluminum ions, supply means for supplying ions eluted from the elution device to a sewage treatment apparatus for purifying sewage, and a control means 40 for controlling the amount of ion elution of the elution apparatus. Sewage treatment apparatus characterized in that provided. An elution device for eluting iron ions or aluminum ions, a conveying means for conveying the sewage of the sewage treatment unit for purifying the sewage, to the sewage treatment unit through the elution apparatus, and a control means for controlling the amount of ion elution of the elution apparatus ( Sewage treatment apparatus comprising a 40). Disposed in the elution tank 37, at least a pair of electrodes 38 using iron or aluminum at least in the anode, a power supply 39 for applying a current between the electrodes 38, and sewage Sewage means comprising the conveying means for conveying the sewage of the sewage treatment unit to be purified to the sewage treatment unit through the elution tank 37 and the control means 40 for controlling the applied current of the power supply device 39. Processing unit. Disposed in the elution tank 37, at least a pair of electrodes 38 using iron or aluminum for at least an anode, a power supply 39 for applying a current between the electrodes, and sewage for purifying sewage Conveying means for conveying the sewage of the treatment part to the sewage treatment part through the elution tank 37, an adjusting means 43 for adjusting the amount of iron ions eluted from the electrode 38, and an output of the adjusting means. Sewage treatment apparatus characterized in that it comprises a control means for controlling the applied current of the power supply device (39) based on. Disposed in the elution tank 37, at least a pair of electrodes 38 using iron or aluminum for at least an anode, a power supply 39 for applying a current between the electrodes, and sewage for purifying sewage Conveying means for conveying the sewage of the processing unit to the sewage treatment unit through the elution tank 37, a sensor 50 for detecting the amount of sewage flowing into the sewage treatment unit from the toilet, and the output of the sensor 50 And control means (40) for controlling the applied current of the power supply device (39). A plurality of pairs of electrodes 38 disposed in the elution tank 37 using at least an anode of iron or aluminum, a power supply 39 for applying a current between the electrodes, and a sewage treatment unit for purifying sewage Conveyance means for conveying filthy water to the effluent treatment part through the elution tank 37, an adjusting means 43 for adjusting the amount of ions eluted from the electrode 38, and an output of the adjusting means. And control means (40) for controlling the number of electrode pairs to which a current is applied among the plurality of electrode pairs (38). A plurality of pairs of electrodes 38 disposed in the elution tank 37 using at least an anode of iron or aluminum, a power supply 39 for applying a current between the electrodes, and a sewage treatment unit for purifying sewage Based on the output of the sensor 50, the conveying means for conveying the sewage to the sewage treatment unit through the elution tank 37, the sensor 50 detecting the amount of sewage flowing into the sewage treatment unit from the toilet, and the output of the sensor 50. And a control means (40) for controlling the number of electrode pairs to which a current is applied among the plurality of electrode pairs (38). A plurality of pairs of electrodes 38 disposed in the elution tank 37 using at least an anode of iron or aluminum, a power supply 39 for applying a current between the electrodes, and a sewage treatment unit for purifying sewage Conveying means for conveying filthy water to the sewage treatment unit through the elution tank 37, adjusting means 43 for adjusting the amount of ions eluted from the electrode 38, and the adjusting means 43 A control means 40 for controlling the number of pairs of electrodes 38 to apply current from among the plurality of pairs of electrodes 38 based on the output, and for changing the pair of electrodes to apply current at predetermined time intervals. Sewage treatment apparatus, characterized in that. A plurality of pairs of electrodes 38 disposed in the elution tank 37 using at least an anode of iron or aluminum, a power supply 39 for applying a current between the electrodes, and a sewage treatment unit for purifying sewage Based on the output of the sensor 50, the conveying means for conveying the sewage to the sewage treatment unit through the elution tank 37, the sensor 50 detecting the amount of sewage flowing into the sewage treatment unit from the toilet, and the output of the sensor 50. And a control means (40) for controlling the number of pairs of electrodes (38) for applying current among the plurality of pairs of electrodes and for changing the pair of electrodes for applying current at predetermined time intervals. An elution tank 37 in which a terminal is fed from a power supply device 39 that applies a current, and a pair of electrodes 38 using iron or aluminum at least at the anode, and the elution tank 37. The electrode unit 62 provided with a terminal mounted on the terminal by mounting to the elution tank 37, and the sewage treatment unit for purifying sewage. Sewage treatment apparatus comprising a conveying means for conveying to the sewage treatment unit through.