JP2005169320A - Drainage purification system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage purification system preventing the deposition of urinary calculus in a drainage passage of water to be treated by allowing the concentration of hypochlorous acid in the draining water to be treated to be kept properly while reducing a value of a current applied to an electrolytic cell. <P>SOLUTION: The system is equipped with a biological treatment tank 2 for biologically treating the drainage containing human waste to convert ammonia into nitrogen gas (or a biological treatment tank to convert ammonia into nitric acid), a storage tank 3 for storing treated water treated by the biological treatment tank, the electrolytic cell 4 for applying electrolysis to the treated water from the storage tank 3 to generate hypochlorous acid, and an electrolytic water circuit 5 for circulating storage water between the storage tank 3 and the electrolytic cell 4. In addition, it is possible that the treated water in the storage tank 3 is re-circulated to a toilet 1 for discharging human waste. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wastewater purification apparatus that generates hypochlorous acid in treated water containing human waste and decolorizes and deodorizes the treated water.

  In general, urine stones are likely to be generated in a drain circuit for treated water containing human waste. And if urine stones adhere to the drainage circuit of treated water containing human waste, the piping may be blocked. Also, in the drainage circuit where urine stones adhere, microorganisms propagate using urine stones as a hotbed, and the decomposition products often cause odor.

  It is believed that urinary urine is converted into ammonia by microorganisms, which causes the pH in urine to rise, and calcium ions in human urine are precipitated as calcium phosphate, calcium carbonate, and the like. That is, it seems that the production is related to pH environment, existing microorganisms, and the like.

  Therefore, in order to prevent precipitation of urine stone, it is conceivable to introduce a bactericide that generates, for example, chlorine. However, there are problems such as lack of simplicity such as continuous charging and control of the amount.

  In addition, it has been proposed that after treating human waste, the treated water can be electrolyzed to effectively suppress precipitation of urine in the drainage route of treated water and malodor associated with the precipitation (see Patent Document 1). ).

In general, when wastewater is reused, water quality standards are set according to applications in so-called middle water, and chromaticity is often one of the items. Here, the chromaticity is a numerical value indicating the degree of the color of water. The hue when 1 mg of platinum and 0.5 mg of cobalt in the chromaticity standard solution are contained in 1 liter of purified water is defined as 1 degree of chromaticity. Is. For example, according to a certain standard, it is preferable that the chromaticity is 50 or less for water for spraying, 10 or less for landscape water, and 30 or less for car wash water. By the way, it is considered that the chromaticity can be effectively reduced because the chromophore is decomposed by hypochlorous acid generated in the treated water.
JP-A-8-294691

However, in the apparatus of Patent Document 1, the treated water after washing the toilet bowl is decomposed by the microbiological decomposition means (biological treatment tank), and the treated water decomposed by the microbiological decomposition means is electrolyzed by the electrolysis means. Hypochlorous acid is generated in the treated water and returned as it is to the water storage tank (water storage tank) above the toilet.
Therefore, in the apparatus of the above-mentioned Patent Document 1, only when water is flowed from the water storage tank above the toilet to the toilet bowl, that is, only when the flowed water passes through the microbiological decomposition means and flows into the electrolytic cell. It was formed so that chlorine ions in the treated water were converted to hypochlorous acid.

  For this reason, in the conventional apparatus, in order to reuse the treated water after passing through the electrolytic cell, it is necessary to use hypochlorous acid in the treated water to be circulated unless the applied current to the electrode in the electrolytic cell is increased. There is a problem that the concentration cannot be secured, and as a result, the amount of hypochlorous acid produced is small, preventing precipitation of urine, prevention of malodor due to precipitation of urine, and decolorization of treated water with hypochlorous acid. There was a problem that it was not enough.

  The present invention has been made in order to solve such problems in the prior art, and while reducing the current value applied to the electrolytic cell, the hypochlorous acid concentration in the drained treated water is set to an appropriate value. The purpose of the present invention is to provide a wastewater purification device that prevents the formation of urine in the drainage route of treated water, prevents the generation of malodor due to the precipitation of urine, and improves the decolorization effect of the treated water. .

  A wastewater purification apparatus according to a first invention that solves the above problems includes a biological treatment tank that biologically treats wastewater containing human waste, a storage tank that stores treated water treated by the biological treatment tank, and a storage tank. An electrolysis tank that electrolyzes treated water from the tank to generate hypochlorous acid, and an electrolyzed water circuit that circulates the stored water between the storage tank and the electrolysis tank are provided.

  Moreover, the waste water purification apparatus according to the second invention for solving the above-mentioned problem is a waste water purification apparatus that circulates and reuses waste water containing human waste, and biologically processes waste water containing human waste from a toilet bowl. A treatment tank, a storage tank for storing the treated water treated by the biological treatment tank, an electrolytic tank for electrolyzing the treated water from the storage tank to generate hypochlorous acid, and between the storage tank and the electrolytic tank And an electrolytically treated water circuit for circulating the stored water, and a circulating circuit for circulating the treated water in the storage tank to the toilet.

  In the first and second aspects of the invention, the biological treatment tank is configured to biologically treat wastewater containing human waste to change ammonia into nitric acid or nitrogen gas. be able to.

  In the first invention and the second invention, it is preferable that the electrolytic treatment water circuit is provided with a removal filter for removing floating substances on the inlet side of the electrolytic cell.

  In the first invention and the second invention, the electrolytic cell may have an electrode plate arranged in parallel with the flow of treated water in the electrolytic cell.

  In the first and second inventions, the electrolytic cell may be arranged in a storage tank.

  In the first and second inventions, the electrolytic cell may be detachably disposed outside the storage tank.

Each of the waste water purification devices is provided with a residual chlorine detector that detects the residual chlorine concentration of the treated water in the electrolytic treatment water circuit or the storage tank, and the residual chlorine concentration detected by the residual chlorine detector is substantially constant. In this way, the electrolytic capacity of the electrolytic cell may be controlled.
In this case, the electrolytic capacity of the electrolytic cell is controlled not only to increase or decrease the electrolytic capacity depending on the detected residual chlorine concentration, but also to stop the electrolytic cell operation when the residual chlorine concentration rises to a predetermined value. The concept includes one that controls start / stop of the electrolytic cell.

  According to 1st invention of this invention, generation | occurrence | production of ammonia used as the factor of urine stone is suppressed by the biological treatment tank of the treated water discharged | emitted from a toilet bowl. This ammonia is thought to be decomposed and induced from urea in human waste, but this urea is first decomposed to ammonia under the action of urease-producing bacteria in an aerobic atmosphere, and further nitrated by nitrifying bacteria in an aerobic atmosphere. Until oxidized. When the biological treatment tank is configured to convert ammonia to nitrogen gas, the nitric acid is subsequently reduced to nitrogen gas by denitrifying bacteria in an anaerobic atmosphere. In this way, ammonia that causes urine deposition in the biological treatment tank is decomposed and discharged into nitric acid or nitrogen gas by biological treatment, so that an increase in pH due to accumulation of ammonia, amine, etc. is suppressed, and urine Stone precipitation is effectively suppressed.

  Further, chlorine ions in human waste are present in the stored water stored in the storage tank through the biological treatment tank. The chlorine ions are circulated in the electrolytic cell and converted into hypochlorous acid on the anode side of the electrolytic cell. Therefore, hypochlorous acid is generated and increased in the treated water in the storage tank. For this reason, microorganisms in human waste are sterilized, and the action of urea in human waste being converted to ammonia by the microorganisms is inhibited. This also makes it possible to suppress the formation of so-called urine stones in which calcium in human waste precipitates as calcium phosphate or calcium carbonate. As a result, it is possible to suppress the precipitation of urine in the drainage circuit of the treated water after the storage tank and the generation of malodor associated with the precipitation. Moreover, since the chromophore in the treated water is decomposed by hypochlorous acid, the chromaticity can be lowered, and the treated water is decolorized.

  As described above, according to the first invention, microorganisms in the treated water stored in the storage tank are sterilized by hypochlorous acid generated in the electrolytic tank. Further, since the chromophore in the treated water is decomposed by hypochlorous acid, the treated water is decolored and deodorized. Therefore, the treated water treated by the waste water purification apparatus according to the first invention can be reused as toilet wash water or the like as deodorized and decolorized treated water that does not generate urine stone.

According to the second invention of the present invention, hypochlorous acid is generated in the treated water in the storage tank by the same apparatus as in the first invention, and microorganisms causing urine stone precipitation are sterilized. Since it is a device that decomposes the chromophore and circulates this water back to the toilet bowl, the decolorized treated water can prevent the precipitation of urinary stones in the toilet bowl and the generation of malodor.
Moreover, since the biological treatment tank is provided after the toilet in the existing toilet, the existing toilet can be easily arranged as in the present invention by arranging the storage tank and the electrolytic tank on the downstream side of the biological treatment tank. Can be remodeled. In addition, it becomes possible to decompose organic matter in the wastewater from the biological treatment tank by oxidative decomposition with hypochlorous acid, and the COD entering the biological treatment tank can be reduced by the circulation circuit, so the degradation load in the biological treatment tank is reduced. be able to.
Further, according to the second invention of the present invention, it is not necessary to introduce an electrolyte such as a sodium chloride preparation required for the production of hypochlorous acid in the circulation path of the treated water, and the maintenance cost is reduced. Further, since a storage tank for sodium chloride preparation, a stirrer for mixing, and the like are unnecessary, the price of the entire product system can be provided at a low price.

  In the first and second inventions, if a removal filter for removing suspended matters is provided on the inlet side of the electrolytic cell in the electrolytic treatment water circuit, minute sludge particles, suspended solids, etc. in the treated water are removed. Therefore, sludge particles adhering to the electrode surface of the electrolytic cell are removed. Therefore, there is no possibility that sludge particles or the like will lower the electrolysis efficiency, and furthermore, it is possible to prevent clogging of piping due to suspended solids.

  In the first and second aspects of the invention, the electrolytic cell has an effect of freshening the surface of the electrode with the flow of water (surface cleaning) when the electrode plate is disposed in parallel with the flow of treated water in the electrolytic cell. Does not degrade the electrolysis performance. Therefore, a backwash device for cleaning the electrode surface is not required. Moreover, adhesion of organic substances or the like to the electrode surface can be reduced, and shortening of the life of the electrode can be suppressed.

  In the first and second inventions, if the electrolytic cell is disposed in the storage tank, the entire product can be reduced in size. Moreover, the piping member required for an electrolytic treatment water circuit can be reduced, and the cost of the whole product system can be reduced.

  In the first and second aspects of the invention, if the electrolytic cell is detachably disposed outside the storage tank, the maintenance time of the electrolytic cell and the work time during replacement can be greatly shortened. Further, the electrolytic cell can be protected from the corrosive gas generated from the storage tank.

Further, in the first and second inventions, when the treatment capacity of the electrolytic cell is controlled so that the residual chlorine concentration of the treated water in the electrolytically treated water circuit or the storage tank becomes substantially constant, the treatment drained from the storage tank It is possible to avoid an adverse effect that the residual chlorine concentration of water becomes too thick and corrodes the water distribution pipe or the like.
Further, by detecting the residual chlorine concentration of the treated water in the storage tank, it becomes possible to know the replacement time (withdrawal time) of the treated water in the storage tank. In addition, it becomes possible to know the time of withdrawal of urine sludge and the like accumulated in the storage tank, which is an important point in maintaining the apparatus system.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a wastewater purification apparatus according to Embodiment 1 of the present invention.
The waste water purification apparatus according to the first embodiment includes a toilet 1, a biological treatment tank 2 connected to the downstream side of the toilet 1, a storage tank 3 disposed on the downstream side of the biological treatment tank 2, and a treatment from the storage tank 3. An electrolytic tank 4 for electrolyzing water, an electrolytic treatment water circuit 5 for circulating stored water between the electrolytic tank 4 and the storage tank 3, a circulation circuit 6 for circulating treated water in the storage tank 3 to the toilet 1 and the like. ing.

The toilet 1 has a water storage tank 1a attached to the rear. The water storage tank 1a is configured such that treated water containing hypochlorous acid is replenished and stored from a storage tank 3 described later in detail. Moreover, the toilet bowl 1 is washed with treated water in the storage tank 1a after use. The toilet 1 is sterilized with microorganisms in human waste by this washing.
In this way, sterilization of microorganisms in human urine is performed with treated water containing hypochlorous acid, whereby precipitation of urolith is suppressed. Moreover, even if urine stones are deposited, the growth of microorganisms therein is suppressed, so that the generation of bad odor is effectively prevented.

The biological treatment tank 2 biologically treats wastewater containing human waste and decomposes ammonia into nitrogen gas, and the first anaerobic tank 21 and the second anaerobic tank by the partition walls 2a, 2b and 2c. 22, the aerobic tank 23 and the treated water tank 24 are separated.
The first anaerobic tank 21 is a tank into which treated water that has washed the toilet 1 flows. In the first anaerobic tank 21, the hardly decomposable impurities contained in the treated water from the toilet 1 are precipitated and separated, and the organic matter is anaerobically decomposed by anaerobic microorganisms attached to the filter bed of the first anaerobic tank 21. The treated water that has been anaerobically decomposed in the first anaerobic tank 21 is transferred to the second anaerobic tank 22 through a communication port 2d formed in the upper part of the partition wall 2a.

  In the second anaerobic tank 22, suspended substances in the treated water are captured by an anaerobic filter bed provided in the tank, and organic substances are anaerobically decomposed by anaerobic microorganisms. The treated water in the second anaerobic tank 22 is transferred to the aerobic tank 23 from the upper communication port 2e.

  In the aerobic tank 23, air is supplied from the lower air diffuser 26 toward the aerobic filter medium 27, and the treated water is aerobically decomposed by aerobic microorganisms that inhabit the aerobic filter medium 27. Thereby, ammonia nitrogen is decomposed into nitrite nitrogen by the action of nitrate bacteria and nitrite bacteria, and this nitrite nitrogen is further decomposed into nitrate nitrogen. The treated water containing nitrate nitrogen thus treated in the aerobic tank 23 is transferred to the treated water tank 24.

  In the treated water tank 24, the aerobically decomposed treated water is separated into a precipitate and a supernatant liquid. The deposit accumulated in the treated water tank 24 is returned to the aerobic tank 23. Further, the supernatant water of the treated water tank 24 is returned to the first anaerobic tank 21 through the connection pipe 28 and recirculated, and is also supplied to the storage tank 3. In addition, when the treated water in the treated water tank 24 is returned to the first anaerobic tank 21, nitrate nitrogen is reduced to nitrogen gas by denitrifying bacteria in the first anaerobic tank 21.

  In addition, when drainage standards permit discharge of nitrate nitrogen, instead of the biological treatment tank 2, a biological treatment tank (hereinafter referred to as a biological treatment tank) that biologically treats wastewater containing human waste and converts ammonia to nitric acid. A simple biological treatment tank). This simple biological treatment tank is configured, for example, by omitting the communication pipe 28 in the biological treatment tank 2. Therefore, when the simplified biological treatment tank is used, after the treated water containing nitrate nitrogen treated in the aerobic tank 23 is transferred to the treated water tank 24, the nitrate nitrogen is directly included in the waste water. Discharged.

  In this way, the biological treatment tank 2 decomposes ammonia, which causes urine stone precipitation, to nitrogen gas (since an alternative simple biological treatment tank decomposes ammonia to nitric acid), accumulation of ammonia, amines, etc. The increase in pH due to is suppressed, and precipitation of urine stones is effectively suppressed.

The storage tank 3 stores the supernatant liquid from the treated water tank 24 described above. Further, a circulation circuit 6 for circulating the treated water of the storage tank 3 to the water storage tank 1 a of the toilet 1 is formed between the storage tank 3 and the water storage tank 1 a of the toilet 1. A circulation pump 61 is connected to the circulation circuit 6. The circulation pump 61 is provided on the storage tank 3 side of the circulation circuit 6.
In addition, an electrolytic cell 4 for electrolyzing the treated water in the storage tank 3 to generate hypochlorous acid is provided outside the storage tank 3. Between the electrolytic tank 4 and the storage tank 3, an electrolytic treatment water circuit 5 for circulating the treated water to the electrolytic tank 4 is provided.

  The electrolytic cell 4 uses an electrode made of a conductive material, and both the anode and the cathode are formed of the same material, and the anode and the cathode of the electrode are periodically controlled to be reversed. This is considered to extend the life of the electrode. More specifically, the electrode is a flat noble metal electrode, for example, a platinum electrode plate 4a. The electrode plate 4a is disposed so as to be parallel to the flow of treated water in the electrolytic cell 4. The electrolytic treatment capacity of the electrolytic cell 4 is configured to be adjustable by controlling the current applied to the electrodes by the control panel 41.

The electrolytic treatment water circuit 5 is provided with a circulation pump 51 on the storage tank 3 side of the circuit for supplying treated water from the storage tank 3 to the electrolytic tank 4. Further, a removal filter 52 for removing suspended matters and the like is provided on the inlet side of the electrolytic cell 4. The electrolytic cell 4 is detachably attached to the electrolytically treated water circuit 5.
As can be seen from FIG. 1, in this embodiment, the lids of the biological treatment tank 2 and the storage tank 3 are embedded in the ground so as to be positioned on the ground surface GL.

The wastewater treatment apparatus of Example 1 configured as described above operates as follows.
When the toilet bowl 1 is used, the treated water stored in the water storage tank 1a flows into the toilet bowl 1. This treated water is treated water containing hypochlorous acid replenished from the storage tank 3. The toilet 1 is cleaned with the treated water containing hypochlorous acid. The human waste contains microorganisms that act to convert urea into ammonia. This washing kills the microorganisms. When microorganisms in human urine are sterilized in this way, the production of ammonia is inhibited, and as a result, precipitation of urinary stones is suppressed. Moreover, since microorganisms are sterilized, even if urine stones are deposited, the growth of microorganisms therein is suppressed, and the generation of malodors is effectively prevented. In addition, the hypochlorous acid in the treated water used for washing | cleaning is substantially consumed by washing | cleaning disinfection action.

  The treated water supplied to the toilet 1 together with the human waste flows into the biological treatment tank 2. The first anaerobic tank 21 in the biological treatment tank 2 precipitates and separates difficult-to-decompose impurities, and the first and second anaerobic tanks 21 and 22 decompose organic nitrogen into ammonia nitrogen. In the aerobic tank 23, ammonia nitrogen is decomposed into nitrite nitrogen by the action of nitrate bacteria and nitrite bacteria, and this nitrite nitrogen is further decomposed into nitrate nitrogen. In the case of the biological treatment tank 2 of FIG. 1, the supernatant liquid is returned to the first anaerobic tank 21 in the treated water tank 24, and nitrate nitrogen is reduced to nitrogen gas by denitrifying bacteria. In addition, when using a simplified biological treatment tank, the supernatant liquid is not returned to the first anaerobic tank 21 in the treated water tank 24. In this way, in the biological treatment tank 2 or the simple biological treatment tank, ammonia that causes urine precipitation is decomposed into nitrogen gas or nitric acid. Thereby, the increase in pH due to accumulation of ammonia, amine, etc. is suppressed, and precipitation of urine stone is effectively suppressed.

Further, the treated water that has been biologically treated in the biological treatment tank 2 (or the simplified biological treatment tank) is stored in the storage tank 3. Further, the treated water stored in the storage tank 3 is circulated between the electrolytic tank 4 and the electrolytic tank 4 by the electrolytic treatment water circuit 5, and is electrolytically treated in the electrolytic tank 4 so as to generate hypochlorous acid in the treated water. Therefore, the residual chlorine concentration in the storage tank 3 can be increased without increasing the current applied to the electrolytic tank 4 as in the prior art. Moreover, the chromophore in the treated water in the storage tank 3 is decomposed by this hypochlorous acid, and the treated water is decolorized. In addition, although hypochlorous acid is converted into a chlorine ion by this conversion, the chlorine ion produced | generated in the storage tank 3 is sent to the electrolytic cell 4, and is converted into hypochlorous acid again.
The treated water containing hypochlorous acid in the storage tank 3 is sent to the storage tank 1a so as to replenish this reduced amount when the treated water in the storage tank 1a is reduced due to the use of the toilet 1. It is done.

Since the waste water treatment apparatus in this embodiment is operated as described above, the following effects can be obtained.
The biological treatment tank 2 can remove ammonia that causes urine stone precipitation. Further, sufficient hypochlorous acid can be generated in the treated water without increasing the applied current of the electrolytic cell 4. Moreover, microorganisms in the treated water stored in the storage tank 3 are sterilized by the hypochlorous acid, and further, the chromophore in the treated water is decomposed in the storage tank 3. Therefore, since the treated water stored in the storage tank 3 is decolorized and deodorized and contains hypochlorous acid, it is effectively reused as wash water for toilets or the like as treated water that suppresses generation of urinary stones. It is possible.

  Further, in the present embodiment apparatus that reuses such treated water as toilet wash water, the storage tank 3 and the electrolytic tank 4 are arranged on the downstream side of the biological treatment tank 2, so that the existing toilet can be used as the main toilet. It can be easily modified as in the invention. Further, in the treated water recycling and recycling apparatus as in this embodiment, it is not necessary to introduce an electrolyte such as a sodium chloride preparation necessary for the production of sodium hypochlorite, and the maintenance cost is reduced. Moreover, since the storage tank 3 for sodium chloride preparation, a stirrer for mixing, and the like are unnecessary, the price of the entire product system can be provided at a low price.

  In addition, since the electrolytic treatment water circuit 5 in this embodiment is provided with a removal filter 52 that removes suspended matters on the inlet side of the electrolytic cell 4, electricity generated by adhering sludge particles or the like to the electrodes of the electrolytic cell 4. A reduction in decomposition efficiency can be prevented, and furthermore, clogging of piping due to suspended solids can be prevented.

  In addition, since the electrode plate 4a is arranged in parallel with the flow of the treated water in the electrolytic cell 4, there is an effect of cleaning the surface of the electrode plate 4a with the flow of water, and the degradation of the electrolysis performance is suppressed. it can. Moreover, the backwashing apparatus which cleans the surface of the electrode plate 4a can be made unnecessary.

  Moreover, in this Example 1, since the electrolytic cell 4 is detachably attached to the electrolytic treatment water circuit 5 outside the storage tank 3, the maintenance time of the electrolytic cell 4 and the work time at the time of replacement | exchange are significantly increased. It can be shortened. Further, the electrolytic cell 4 can be protected from the corrosive gas generated from the storage tank 3.

Next, Example 2 will be described with reference to FIG.
As shown in FIG. 2, the second embodiment is configured such that the electrolytic cell 4 and the removal filter 52 are housed in the storage tank 3, and other configurations are the same as those of the first embodiment.
If the electrolytic cell 4 is arranged in the storage tank 3 as in Example 2, the entire product can be downsized. Moreover, the piping member required for the electrolytic treatment water circuit 5 can be reduced, and the cost of the whole product system can be reduced.

Next, Example 3 will be described with reference to FIG.
In the third embodiment, a residual chlorine detector 45 that detects the residual chlorine concentration of the treated water is provided in the storage tank 3. Instead of providing the residual chlorine detector 45, it is also possible to provide a residual chlorine detector 46 for detecting the residual chlorine concentration of the treated water on the downstream side of the electrolytic cell 4 in the electrolytic treated water circuit 5.
Further, in the third embodiment, the treatment capacity of the electrolytic cell 4 is controlled so that the residual chlorine concentration of the treated water in the storage tank 3 or the electrolytic treatment water circuit 5 becomes substantially constant as described above. Therefore, it is possible to avoid the adverse effect that the residual chlorine concentration of the treated water becomes too thick and corrodes the water distribution pipe or the like. In order to control the electrolytic treatment capacity, the current applied to the electrode plate 4a may be increased or decreased, but the operation of the electrolytic cell 4 is stopped when the measured residual chlorine concentration reaches a predetermined value. You may control.
In addition, by detecting the residual chlorine concentration of the treated water in the storage tank 3 in this way, it becomes possible to know the replacement time (withdrawal time) of the treated water in the storage tank 3. In addition, it becomes possible to know the timing for extracting the urine sludge and the like accumulated in the storage tank 3, which can be an important point in maintaining the apparatus system.

1 is a system configuration diagram of a wastewater treatment apparatus according to Embodiment 1 of the present invention. It is a system configuration | structure figure of the waste water treatment equipment which concerns on Example 2 of this invention. It is a system block diagram of the waste water treatment equipment which concerns on Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toilet 2 Biological treatment tank 3 Reservoir tank 4 Electrolysis tank 4a Electrode plate 5 Electrolyzed water circuit 6 Circulation circuit 45 Residual chlorine detector 46 Residual chlorine detector 52 Removal filter

Claims (8)

  A biological treatment tank that biologically treats wastewater containing human waste, a storage tank that stores treated water treated by the biological treatment tank, and electrolyzes the treated water from the storage tank to generate hypochlorous acid A drainage purification apparatus comprising: an electrolytic tank to be used; and an electrolytic treatment water circuit for circulating the stored water between the storage tank and the electrolytic tank.   Biological treatment tank for biological treatment of wastewater containing human waste from toilet bowl, storage tank for storing treated water treated by biological treatment tank, and hypochlorite by electrolyzing the treated water from the storage tank It comprises an electrolytic tank for generating acid, an electrolytic treatment water circuit for circulating stored water between the storage tank and the electrolytic tank, and a circulation circuit for circulating treated water in the storage tank to the toilet. Wastewater purification equipment that circulates and reuses wastewater containing human waste.   The wastewater purification apparatus according to claim 1 or 2, wherein the biological treatment tank is configured to biologically treat wastewater containing human waste to convert ammonia into nitric acid or nitrogen gas.   The waste water purification apparatus according to any one of claims 1 to 3, wherein a removal filter for removing suspended matters is provided on an inlet side of the electrolytic cell in the electrolytic treatment water circuit.   The drainage purification apparatus according to any one of claims 1 to 4, wherein the electrolytic cell has an electrode plate arranged in parallel with the flow of treated water in the electrolytic cell.   The waste water purification apparatus according to any one of claims 1 to 5, wherein the electrolytic cell is disposed in a storage tank.   The waste water purification apparatus according to any one of claims 1 to 5, wherein the electrolytic cell is detachably disposed outside the storage tank.   The waste water purification apparatus according to any one of claims 1 to 7, wherein a residual chlorine detector for detecting a residual chlorine concentration of treated water is provided, and the residual chlorine concentration detected by the residual chlorine detector is substantially constant. A drainage purification apparatus characterized by controlling the electrolysis capacity of an electrolytic cell.

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