JP2009011949A - Sewage purifying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewage purifying apparatus which can effectively dilute sewage while maximizing water saving and prevent waste water from sacrificing a natural environment and to provide a sewage purifying method. <P>SOLUTION: In the sewage purifying apparatus, a sewage inflow pipe 23, through which sewage flows into a purifying tank 20 comprising an aerobic tank 22 and an anaerobic tank 21, is connected to the purifying tank 20. A treated water outflow pipe 24, through which water treated in the purifying tank 20 flows out, is connected to the purifying tank 20. A sewage concentration sensor 18 is provided on the sewage inflow pipe 23 side of the aerobic tank 22. A treated water concentration sensor 19 is provided on the treated water outflow pipe 24 side of the aerobic tank 22. From the sewage concentration and the treated water concentration detected with the sewage concentration sensor 18 and the treated water concentration sensor 19, water is divided from a water flow rate regulating part 13 and is distributed into the sewage inflow pipe 23 side and the treated water outflow pipe 24 side of the aerobic tank 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewage purification apparatus and a sewage purification method capable of purifying sewage efficiently while purifying sewage while minimizing the amount of water used.

  In recent years, the necessity of water quality conservation has been screamed from the viewpoint of protecting the natural environment. Conventionally, industrial wastewater has been a major cause of water pollution, but due to various regulations, water pollution due to industrial wastewater tends to decrease. On the other hand, it is reported that domestic wastewater contributes to water pollution, and effective purification means for purifying domestic wastewater is required in each household.

In the purification of domestic wastewater, it is necessary to dilute and drain the sewage, and it is possible to dilute in any way as long as the water can be used for dilution, but on the other hand, water saving Therefore, it is difficult to effectively dilute sewage and purify domestic wastewater while conserving water as much as possible, and there is a need for means that can achieve both water saving and sewage purification.
An example of prior art relating to a purification device is described in Patent Document 1.

JP-A-9-174072

In order to provide a compact middle-water treatment system that can be easily installed for general households, the device described in Patent Document 1 stores purified treated water in a small treated water storage tank. The treated water stored in the storage tank can be used as toilet water, car wash, water for miscellaneous use such as watering.
In the thing of patent document 1, it can be said that the effective utilization of water is achieved from a viewpoint of storing the treated water which carried out the purification process in a small treated water storage tank, and reusing this. From the viewpoint of effective use of water, the present inventor has the effect of purifying and diluting sewage while minimizing the amount of water required for purifying and diluting sewage when releasing domestic wastewater to nature. I thought that there was a need for a means that maximized.
The present invention has been made in consideration of such circumstances, and a sewage purification apparatus and a sewage purification method that effectively dilutes sewage while conserving water as much as possible and does not impair the natural environment by wastewater. The purpose is to provide.

  In order to solve the above problems, the sewage purification apparatus of the present invention is a treatment in which a sewage inflow pipe into which sewage flows is connected to the septic tank and processed by the septic tank with respect to the septic tank composed of an aerobic tank and an anaerobic tank. A treated water outflow pipe from which water flows out is connected to a septic tank, a sewage concentration sensor is provided on the sewage inflow pipe side of the aerobic tank, and a treated water concentration sensor is provided on the treated water outflow pipe side of the aerobic tank, Based on the sewage concentration and the treated water concentration detected by the sewage concentration sensor and the treated water concentration sensor, water branches from the water flow rate control unit to the sewage inflow pipe side and the treated water outflow pipe side of the aerobic tank. It is characterized by being distributed.

  Since the aerobic bacteria that fill the aerobic tank grow abnormally or die if the biochemical oxygen demand (BOD) in the aerobic tank is not within the predetermined range, purification by aerobic bacteria In order to be properly performed, it is necessary to dilute the sewage flowing into the aerobic tank so that the concentration is within an appropriate range to maintain a normal breeding state. Therefore, in the sewage purification apparatus of the present invention, the sewage concentration sensor provided on the sewage inflow pipe side of the aerobic tank detects the concentration of sewage flowing into the aerobic tank and supplies water from the water flow rate control unit. In this way, the waste water is diluted so that purification can be performed in an optimal state in the aerobic tank.

On the other hand, in order to dilute sewage components still remaining after purification by bacteria, the concentration of treated water flowing out of the aerobic tank is detected by the treated water concentration sensor provided on the treated water outflow pipe side of the aerobic tank. Then, the treated water flowing out from the septic tank is diluted and released to the natural world.
The amount of water used for such dilution necessary for the growth of bacteria in the aerobic tank and dilution of the treated water that flows out after purification in the aerobic tank is determined by the water flow control unit. The amount of water used is minimized, so that the maximum effect can be obtained for the purification and dilution of sewage.

In the sewage purification apparatus of the present invention, it is preferable that a sprayer is provided in the treated water outflow pipe, and water is branched and distributed from the water flow rate control unit to the sprayer.
In diluting the treated water, it is preferable that the concentration of the treated water after dilution is as uniform as possible, but since the sprayer sprays mist water, only a specific area of the treated water is not diluted, Exhibits excellent effect in equalizing the concentration of treated water.

In the sewage purification apparatus of the present invention, it is preferable that a dilution tank is provided in the treated water outflow pipe, and water is branched and distributed from the water flow rate adjusting unit to the dilution tank.
After being diluted with a sprayer, it is further diluted in a dilution tank and discharged as a supernatant, which is effective as a purification means that does not damage the natural environment.

In the sewage purification apparatus of the present invention, a water distribution pipe is connected to the water flow rate control unit from a water storage tank via a water supply, and a rainwater supply pipe for supplying rainwater is disposed in the water storage tank. It is preferable that rainwater is supplied to the water flow rate control unit.
By preferentially using rainwater stored as water used for diluting sewage, the water-saving effect is great.

In the sewage purification apparatus of the present invention, a tap water supply unit and a groundwater supply unit are connected to the water supply device, and tap water is supplied according to a remaining water storage amount detected by a remaining water storage sensor installed in the water storage tank. It is preferable that either one or both of tap water and groundwater is supplied to the water feeder from one or both of the supply unit and the groundwater supply unit.
Tap water or groundwater is used as needed based on information from the remaining water storage sensor in preparation for when rainwater reserve is insufficient, such as when there is little precipitation.

  The sewage purification method of the present invention is based on the sewage concentration detected by the sewage concentration sensor installed on the sewage inflow pipe side of the aerobic tank, and the sewage concentration in the aerobic tank is within a range suitable for the growth of aerobic bacteria. The process of diluting the sewage flowing into the aerobic tank so that it flows out from the aerobic tank based on the treated water concentration detected by the treated water concentration sensor installed on the treated water outflow pipe side of the aerobic tank It is characterized in that the treated water flowing out from the aerobic tank is diluted and drained so that the water concentration is below the reference value concentration.

  By diluting the sewage flowing into the aerobic tank so that the sewage concentration in the aerobic tank is within the range suitable for the growth of aerobic bacteria, Achieving the maximum purification function and diluting the treated water flowing out of the aerobic tank so that the concentration of the treated water flowing out of the aerobic tank is below the reference concentration, adversely affects the natural world There is nothing. The amount of water used to dilute the sewage flowing into the aerobic tank and the amount of water used to dilute the treated water flowing out of the aerobic tank are determined by the sewage concentration sensor and the treated water concentration sensor. In addition, it is possible to obtain the maximum effect of sewage purification while minimizing the amount of water used.

In the sewage purification method of the present invention, it is preferable that rainwater is preferentially used as the water used for the dilution, and tap water or groundwater is selectively used.
From the viewpoint of saving water, it is preferable to use rainwater preferentially, but it can be changed by using tap water or groundwater as needed in case rainwater reserves are insufficient, such as when there is little rainfall. The waste water treatment corresponding to the situation is possible.

  According to the present invention, it is possible to realize a sewage purification apparatus and a sewage purification method that effectively dilutes sewage while saving water as much as possible, and does not impair the natural environment.

Below, the sewage purification apparatus and sewage purification method of this invention are demonstrated based on the embodiment.
In FIG. 1, the structure of the sewage purification apparatus which concerns on embodiment of this invention is shown.
In FIG. 1, a rainwater supply pipe 2 that supplies rainwater is disposed above a water storage tank 1 that is disposed outdoors, and rainwater that flows in from the rainwater supply pipe 2 is accumulated in the water storage tank 1. A water supply 4 is connected to the water storage tank 1 via a water distribution pipe 3, and rainwater accumulated in the water storage tank 1 is supplied to the water supply 4. In addition, a tap water supply unit 5 and a ground water supply unit 6 are connected to the water feeder 4 via a tap water supply pipe 7 and a ground water supply pipe 8, and tap water or ground water is supplied as necessary. To be supplied.

  The water storage tank 1 is provided with a remaining water storage sensor 9 that detects the remaining amount of stored water, and the remaining water storage sensor 9 is electrically connected to a water supply control unit 10 installed in the water supply 4. . Moreover, the water supply control part 10 installed in the water feeder 4 is electrically connected with the water supply button 11 installed indoors.

  In the present invention, from the viewpoint of saving water, rainwater supplied from the rainwater supply pipe 2 is preferentially used. However, in the case where the rainwater reserve is insufficient, such as when there is little rainfall, Based on the information from 9, tap water or groundwater is used as needed. The selection of the water to be used is basically automatically performed by the remaining water storage sensor 9 and the water supply control unit 10, but the type of water to be used is manually selected by the water supply button 11 installed indoors. You can also.

  The water supply 4 is connected to the water flow rate adjustment unit 13 via the water distribution pipe 12, and the water supplied from the water supply 4 to the water flow rate adjustment unit 13 is a plurality of branch pipes connected to the water flow rate adjustment unit 13. The first branch pipe 14, the second branch pipe 15, and the third branch pipe 16 are distributed in consideration of the distribution ratio of the distributed water. A distribution control unit 17 is installed in the water flow rate adjustment unit 13, and a sewage concentration sensor 18 and a treated water concentration sensor 19 described later are electrically connected to the distribution control unit 17. Based on the information sent from 18 and the treated water concentration sensor 19, the distribution ratio of water distributed from the water flow rate adjustment unit 13 is determined.

  The septic tank 20 is formed by connecting an anaerobic tank 21 and an aerobic tank 22, the anaerobic tank 21 is filled with anaerobic microorganisms, and the aerobic tank 22 is filled with aerobic microorganisms. A sewage inflow pipe 23 is connected to the anaerobic tank 21, and sewage flows into the anaerobic tank 21. Further, a sewage concentration sensor 18 for detecting the concentration of sewage flowing into the aerobic tank 22 is installed on the inlet side of the aerobic tank 22, and the outlet side of the aerobic tank 22 is preferably processed by the septic tank 20. A treated water concentration sensor 19 for detecting the concentration of treated water flowing out of the air tank 22 is installed.

  The first branch pipe 14 is connected to the aerobic tank 22, and the water supplied from the water flow rate adjusting unit 13 via the first branch pipe 14 dilutes the sewage flowing into the aerobic tank 22. A treated water outflow pipe 24 is connected to the aerobic tank 22, and a sprayer 25 and a dilution tank 26 are arranged in this process water outflow pipe 24 in this order as viewed from the aerobic tank 22 side. A second branch pipe 15 is connected to the sprayer 25, and a third branch pipe 16 is connected to the dilution tank 26, and water is supplied from the water flow rate adjusting unit 13 to the sprayer 25 and the dilution tank 26. The Further, a rain gutter may be provided in the dilution tank 26 so that rainwater flows directly into the dilution tank 26.

In the septic tank 20, first, suspended matter in sewage is removed in the anaerobic tank 21, and organic substances contained in the sewage are removed by anaerobic microorganisms.
In the septic tank 20, it is necessary to remove nitrogen contained in the domestic wastewater, but most of the nitrogen contained in the wastewater exists as ammonium ions obtained by ionizing ammonia contained in manure, etc. By oxidizing ammonium ions, they are converted to nitrate ions via nitrite ions. This nitrification process is performed in the aerobic tank 22.

  However, if the concentration of the sewage flowing into the aerobic tank 22 is too high, the aerobic microorganisms filled in the aerobic tank 22 abnormally propagate, and as a result, BOD (Biochemical Oxygen Demand) in the aerobic tank 22 is increased. Get higher. BOD is the amount of oxygen consumed by microorganisms when decomposing organic substances in water. The increase in the amount of oxygen consumed causes the aerobic tank 22 to become deficient and kills the aerobic microorganisms. In addition, when the sewage flowing into the aerobic tank 22 contains a lot of detergent or the like that is not suitable for the growth of aerobic microorganisms, the aerobic microorganisms are also killed.

  Therefore, when the sewage concentration sensor 18 senses that the concentration of sewage flowing into the aerobic tank 22 is higher than the upper limit reference value, the water flow rate adjustment unit 13 passes through the first branch pipe 14 based on the information. Water is supplied to the aerobic tank 22, the concentration of sewage flowing into the aerobic tank 22 is lowered, aerobic microorganisms are suitably propagated, and the sewage treatment capacity is increased.

On the other hand, if the BOD is too low, the microbial feed will be reduced and the microorganism will be reduced, and the sewage purification ability will be reduced. Therefore, it is necessary to maintain a BOD concentration that allows the microorganisms to propagate properly. is there. Therefore, when the sewage concentration sensor 18 senses that the sewage concentration in the aerobic tank 22 is lower than the lower limit reference value, the supply of water from the water flow rate adjustment unit 13 is stopped.
Nitrate ions generated in the aerobic tank 22 by the nitrification process are returned to the anaerobic tank 21 as a nitrification liquid, reduced in the anaerobic tank 21 to become nitrogen molecules, and the nitrogen molecules are diffused into the atmosphere and discharged into the waste water. Separate from.

  The treated water thus treated by the septic tank 20 is discharged from the treated water outflow pipe 24. The treated water outflow pipe 24 is provided with a sprayer 25, and the sprayer 25 has a second branch pipe. 15 are connected. Water is supplied from the water flow rate adjusting unit 13 to the sprayer 25 via the second branch pipe 15, and mist water is sprayed from the sprayer 25 to the treated water.

  The treated water is treated by the bacteria in the septic tank 20, but as described above, the sewage concentration in the septic tank 20 is maintained within a certain range in order to maintain the propagation of bacteria in the septic tank 20 in an optimum state. In some situations, further dilution may be necessary to release to nature.

  In the present invention, in preparation for such a case, when the treated water concentration sensor 19 determines that the treated water concentration is higher than the reference value and the treated water needs to be diluted, the sprayer 25 treats the mist water. Spray the water to dilute the treated water. In diluting the treated water, it is preferable that the concentration of the treated water after dilution is as uniform as possible. However, since the sprayer 25 sprays mist-like water, only a specific region of the treated water is not diluted. It is advantageous in that the concentration of treated water is made uniform. As a form of the sprayer 25, for example, a nozzle-shaped spray port may be provided, and water may be ejected from the spray port at a predetermined pressure.

  The treated water outflow pipe 24 is further provided with a dilution tank 26, and the treated water diluted with the mist-like water ejected from the sprayer 25 is temporarily stored in the dilution tank 26. The third branch pipe 16 is connected to the dilution tank 26, and the treated water after being diluted by the sprayer 25 is further diluted in the dilution tank 26, and the supernatant liquid is discharged. Since the dilution tank 26 is the last dilution means, it is desirable to dilute as much as possible. Therefore, when there is a surplus in the remaining amount of dilution water, the remaining dilution water is used as much as possible. Moreover, rainwater can also be directly used by providing a rain gutter separately in the dilution tank 26 so that rainwater flows directly into the dilution tank 26.

  Thus, in the present invention, based on the sewage concentration detected by the sewage concentration sensor 18, the aerobic tank 22 is set so that the sewage concentration in the aerobic tank 22 is within a range suitable for the growth of aerobic bacteria. By optimizing the breeding condition of the bacteria in the inside, the purification of sewage by bacteria is promoted at an optimum level. On the other hand, in order to dilute the sewage components still remaining after purification by bacteria, the treated water flowing out from the septic tank 20 is diluted and released to the natural world. According to this method, the purification effect by bacteria is enhanced at the highest level by using a minimum amount of water necessary for optimizing the breeding state of bacteria in the aerobic tank 22, so that the purification effect is improved. On the other hand, purification of bacteria still dilutes residual sewage components, so that the total amount of water used can be used to obtain clean drainage that can be released to the natural world with the minimum amount used. It has a great effect on both water saving and protection of the natural environment.

  INDUSTRIAL APPLICABILITY The present invention can be used as a sewage purification apparatus and a sewage purification method that effectively dilutes sewage while saving water as much as possible, and does not impair the natural environment.

It is a figure which shows the structure of the sewage purification apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water storage tank 2 Rainwater supply pipe 3 Water distribution pipe 4 Water supply device 5 Tap water supply part 6 Groundwater supply part 7 Tap water supply pipe 8 Groundwater supply pipe 9 Water storage residual quantity sensor 10 Water supply control part 11 Water supply button 12 Water supply pipe 13 Water flow adjustment Section 14 First branch pipe 15 Second branch pipe 16 Third branch pipe 17 Distribution control section 18 Sewage concentration sensor 19 Treated water concentration sensor 20 Septic tank 21 Anaerobic tank 22 Aerobic tank 23 Sewage inflow pipe 24 Treated water outflow pipe 25 Nebulizer 26 Dilution tank

The present invention, in order to purify the sewage, while minimizing the amount of water, about the dirty water equipment capable of purifying efficiently sewage.

Claims (7)

  For the septic tank composed of an aerobic tank and an anaerobic tank, a sewage inflow pipe into which sewage flows is connected to the septic tank, and a treated water outflow pipe from which the treated water treated by the septic tank flows out is connected to the septic tank, and the aerobic tank A sewage concentration sensor is provided on the sewage inflow pipe side of the tank, a treated water concentration sensor is provided on the treated water outflow pipe side of the aerobic tank, and the sewage concentration detected by the sewage concentration sensor and the treated water concentration sensor A sewage purification apparatus characterized in that water is branched and distributed from the water flow rate control unit to the sewage inflow pipe side and the treated water outflow pipe side of the aerobic tank based on the treated water concentration.   The sewage purification apparatus according to claim 1, wherein a sprayer is provided in the treated water outflow pipe, and water is branched and distributed from the water flow rate adjusting unit to the sprayer.   The sewage purification apparatus according to claim 1 or 2, wherein a dilution tank is provided in the treated water outflow pipe, and water is branched and distributed to the dilution tank from the water flow rate adjusting unit.   A water distribution pipe is connected to the water flow rate adjusting unit from a water storage tank via a water supply, and a rainwater supply pipe for supplying rain water is disposed in the water storage tank. The rainwater supply pipe causes rainwater to flow into the water flow rate adjusting unit. The sewage purification apparatus according to any one of claims 1 to 3, wherein the sewage purification apparatus is supplied.   A tap water supply unit and a groundwater supply unit are connected to the water supply unit, and either a tap water supply unit or a groundwater supply unit is selected according to the remaining water amount detected by a remaining water storage sensor installed in the water storage tank. The sewage purification apparatus according to claim 4, wherein one or both of tap water and groundwater is supplied to the water supply device from one or both.   Based on the sewage concentration detected by the sewage concentration sensor installed on the sewage inflow pipe side of the aerobic tank, it flows into the aerobic tank so that the sewage concentration in the aerobic tank is within the range suitable for the growth of aerobic bacteria. The concentration of treated water flowing out of the aerobic tank is below the reference value concentration based on the treated water concentration detected by the treated water concentration sensor installed on the treated water outflow pipe side of the aerobic tank The waste water purification method characterized by diluting and draining the treated water which flows out from an aerobic tank so that it may become.   The sewage purification method according to claim 6, wherein rainwater is preferentially used as the water used for the dilution, and tap water or groundwater is selectively used.

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