JP2018057995A - Sewage purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-contained sewage purification system which has an improved durability and an improved maintainability and has an improved decomposing ability.SOLUTION: A sewage purification system 1 includes an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5, and an advanced oxidation tank 6. Each tank is disposed in the vicinity of any one or more of the other tanks. Every tank retains an identical water level. An intermittently-operated submersible pump 19 is placed in the anaerobic tank 3. One end of a transfer tube 21 is connected to the submersible pump 19 and the other end is connected to an inflow port of a solid-liquid separator 20. One end of a transfer tube 22 is connected to an outflow port of the solid-liquid separator 20 and the other end is located in the anoxic tank 4. A scum pump 31 is placed floating in the advanced oxidation tank 6. One end of a return pipe 32 is connected to the scum pump 31 and the other end is located in the anaerobic tank 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wastewater purification system. More specifically, the present invention relates to a self-contained wastewater purification system capable of decomposing organic matter such as stool and having improved resolution with less difficulty.

Decomposing and treating organic matter such as feces (hereinafter simply referred to as “organic matter”) is extremely important.
In other words, if the organic matter is left unattended, it becomes an environmentally unsanitary state, and it is necessary to treat it appropriately. Although it can be considered as a method of treating organic matter to drain into sewage, it cannot be drained into sewage in an environment where sewage facilities are not available. For this reason, in such an environment, it is necessary to decompose and process organic matter on the spot.
However, in an environment where sewage facilities are not provided, other facilities such as electricity and water are not provided, and the supply of energy and water necessary for processing is often insufficient. For this reason, it is preferable that the disassembling / processing method is as self-contained as possible. For example, Patent Document 1 discloses a technique related to such a self-contained wastewater purification system.

Japanese Patent Laying-Open No. 2015-127039

The technique (prior art) disclosed in Patent Document 1 is a technique developed by the present inventor, and is useful in that the system can be made compact and an economical non-water-supplying circulating toilet device can be realized. It is.
However, problems still remain in such prior art. That is, in the prior art, as shown in FIG. 14, the tanks constituting the system are connected by piping. Since the tanks are relatively distant from each other, the positional relationship between the tanks is distorted due to shaking or vibration during transportation or daily use. For this reason, the piping arranged through the gap is displaced, or a joint between the piping and the tank is cracked, leading to failure. Thus, the prior art has a problem that the entire system is poor in durability and maintainability.

  Against the background of the above circumstances, the present invention aims to develop a self-contained sewage purification system that improves the durability and maintainability and further improves the resolution by evolving the technology of Patent Document 1. .

  As a result of diligent research, the inventor has conceived a wastewater purification system in which the tanks for purification treatment are arranged close to each other to shorten the length of the piping as much as possible and the resolution is further improved by providing an accelerated oxidation tank. The invention was completed.

That is, in the wastewater purification system of the present invention, by disposing the tanks close to each other, the displacement between the tanks can be almost eliminated, and the length of the pipe can be shortened as much as possible. . As a result, the wastewater purification system of the present invention has a structure in which piping displacement and distortion are extremely unlikely to occur.
In addition, the wastewater purification system of the present invention is configured to float the solid matter flowing into and generated in the tank along with the decomposition of the organic matter by oxidation in the accelerated oxidation tank, and return it by the scum pump. This enables floating separation of solid matter.

The present invention has the following configuration.
The first configuration of the present invention is:
An anaerobic tank that purifies the wastewater supplied from the wastewater source by anaerobic bacteria;
An anaerobic tank that purifies the wastewater purified in the anaerobic tank by denitrifying bacteria;
An aerobic tank for purifying the wastewater purified in the anaerobic tank with nitrifying bacteria;
An accelerated oxidation tank that purifies the wastewater purified by the aerobic tank by oxidative decomposition;
With
A wastewater purification system in which each of these tanks is arranged close to any other tank or a plurality of tanks, and the water level in each tank is kept the same.
In the anaerobic tank, an intermittently activated submersible pump is installed,
The submersible pump is connected to one end of a first transfer pipe whose other end is connected to the inlet of the solid-liquid separator,
The outlet of the solid-liquid separator is connected to one end of a second transfer pipe whose other end is located in the oxygen-free tank,
A scum pump is suspended in the accelerated oxidation tank,
The scum pump is connected to one end of a return pipe whose other end is located in the anaerobic tank.

According to a second configuration of the present invention, the oxidative decomposition in the accelerated oxidation tank is performed by combining one or more of hydrogen peroxide supply, high molecular organic acid (high electron density organic acid) supply, and ozone supply. It is performed, It is performed, It is a wastewater purification system as described in the 1st structure.
According to a third configuration of the present invention, the high-molecular organic acid contains at least one or more of fulvic acid and humic acid. Wastewater purification system.
A fourth configuration of the present invention is the wastewater purification system according to the second or third configuration, wherein the oxidative decomposition in the accelerated oxidation tank is further performed by combining electrolysis.
A fifth configuration of the present invention is the wastewater purification system according to the fourth configuration, wherein the accelerated oxidation tank includes an electrolysis tank at the center thereof.
The sixth configuration of the present invention is the first to fifth configurations characterized by further comprising a microbubble generator, wherein the solid matter is floated by generating microbubbles at the bottom of the accelerated oxidation tank. It is a wastewater purification system of description.
A seventh configuration of the present invention is the wastewater purification system according to the fifth or sixth configuration, wherein the accelerated oxidation tank and the electrolysis tank are formed in a concentric cylindrical shape. .

The eighth configuration of the present invention is:
A first membrane separation tank for purifying the wastewater purified in the accelerated oxidation tank by membrane separation;
An ozone contact tank for purifying the wastewater purified in the first membrane separation tank with ozone;
The wastewater purification system according to any one of the first to seventh aspects, further comprising a biological activated carbon tank that purifies the wastewater purified in the ozone contact tank with biological activated carbon.
The ninth configuration of the present invention further comprises a second membrane separation tank for purifying the wastewater purified in the biological activated carbon tank by membrane separation, according to the eighth configuration, It is a purification system.
According to a tenth configuration of the present invention, a biological aeration tank that purifies the wastewater purified in the accelerated oxidation tank by biological treatment, and a wastewater purified in the biological aeration tank is purified by membrane separation. A first membrane separation tank, an ozone contact tank that purifies the wastewater purified in the first membrane separation tank with ozone, and a living organism that purifies the wastewater purified in the ozone contact tank with biological activated carbon. The wastewater purification system according to any one of the first to seventh configurations, further comprising an activated carbon tank.
The eleventh configuration of the present invention includes a treated water tank for storing the wastewater purified in the biological activated carbon tank, and a treated water stored in the treated water tank is transferred, and the treated water is purified by membrane separation. The wastewater purification system according to the tenth configuration, further comprising a two-membrane separation tank.
According to a twelfth configuration of the present invention, the membrane used in the first membrane separation tank or the second membrane separation tank is an MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), NF membrane (nanofiltration). The wastewater purification system according to the ninth or eleventh configuration, wherein the system is selected from any one or a plurality of membranes) or RO membranes (reverse osmosis membranes).

  According to the present invention, it has become possible to provide a self-contained sewage purification system with improved resolution and further improved durability and maintainability by improving the technology of Patent Document 1.

The conceptual diagram which shows the structure and flow of the wastewater purification system in Embodiment 1 of this invention. 1 is an elevation view showing the overall configuration of the wastewater purification system in Embodiment 1 of the present invention. The top view which shows the whole structure of the wastewater purification system in Embodiment 1 of this invention The figure which shows the acceleration | stimulation oxidation tank which comprises the waste water purification system in Embodiment 1 of this invention ((a) is an elevation view, (b) is a top view) Elevated view showing an accelerated oxidation circulation device (microbubble generator) constituting the wastewater purification system according to Embodiment 1 of the present invention. The conceptual diagram which shows the other structure and flow of the wastewater purification system in Embodiment 1 of this invention The conceptual diagram which shows the structure and flow of the wastewater purification system in Embodiment 2 of this invention. Elevation figure which shows the whole structure of the wastewater purification system in Embodiment 2 of this invention The top view which shows the whole structure of the waste water purification system in Embodiment 2 of this invention The figure which shows the accelerated oxidation tank which comprises the waste water purification system in Embodiment 2 of this invention ((a) is an elevation view, (b) is a top view) The elevational view ((a) is a mixed injection type of ozone gas and hydrogen peroxide solution, and (b) is ozone) showing the accelerated oxidation circulation device (microbubble generator) constituting the wastewater purification system in Embodiment 2 of the present invention. Water and hydrogen peroxide water separate injection type) The figure for demonstrating the effect resulting from the structure of the acceleration | stimulation oxidation tank which comprises the waste water purification system in Embodiment 2 of this invention (the 1) The figure for demonstrating the effect resulting from the structure of the acceleration | stimulation oxidation tank which comprises the wastewater purification system in Embodiment 2 of this invention (the 2) Elevation view showing the overall configuration of the wastewater purification system in the prior art

  Hereinafter, the present invention will be described more specifically with reference to preferred embodiments. However, the following embodiment is merely an example embodying the present invention, and the present invention is not limited to this.

<< I. Overview of wastewater purification system >>
The wastewater purification system of the present invention is characterized in that the tanks that perform purification treatment and the like are arranged close to each other to shorten the length of the piping as much as possible, and the accelerated oxidation tank is provided to further improve the resolution.

That is, in the wastewater purification system of the present invention, by disposing the tanks close to each other, the displacement between the tanks can be almost eliminated, and the length of the pipe can be shortened as much as possible. Is.
And by these structures, the waste water purification system of this invention becomes a structure which is hard to produce the shift | offset | difference and distortion of piping.
In the present invention, “closely arranged” means that the tanks are in contact with each other, or that the positional deviation between the tanks during movement or daily use is close enough not to cause failure. Defined.

  The accelerated oxidation tank decomposes organic substances by oxidation, floats the solids that flow into and out of the tank, and returns them to the anaerobic tank by a scum pump. Is possible.

The wastewater purification system of the present invention includes an anaerobic tank, an oxygen-free tank, an aerobic tank, and an accelerated oxidation tank as essential components. These essential components play a major role in the wastewater purification system in the wastewater decomposition process and the removal of solids from the system.
In the wastewater purification system of the present invention, other components can be provided. Examples of such optional components include a first membrane separation tank, an ozone contact tank, a biological activated carbon tank, and a second membrane separation tank, which are arranged after the accelerated oxidation tank. By providing these components, the wastewater that has been purified up to the accelerated oxidation tank can be further purified to a level where legal regulations can be cleared or used as drinking water or washing water. Therefore, the usefulness of the wastewater purification system of the present invention can be improved.

Each tank, which is an essential and optional component in the present invention, is arranged close to one or more other tanks. In addition, each tank is directly connected to the top or bottom of the tank, or a transfer pipe or a return pipe is disposed as appropriate, so that treated water can be moved between the tanks. Furthermore, the water level in each tank is kept the same. According to these configurations, it is possible to move the treated water according to gravity, and it is possible to function as a self-contained wastewater purification system with the minimum energy for movement. It is done.
In the present invention, “the water level is kept the same” only needs to be the same to the extent that gravity can cause movement of the treated water, and in this sense, it is not necessarily required to be exactly the same. Absent.

In the contaminated water purification system of the present invention, it can be used for various purposes.
That is, as exemplified in FIG. 6 and the like, it can be used for various applications related to the decomposition of organic matter such as manure treatment in a barn or a simple toilet, manure in a simple house, and domestic wastewater treatment.

Hereinafter, the configuration of each tank in the wastewater purification system of the present invention will be described.
[Anaerobic tank]
The anaerobic tank functions to purify the wastewater supplied from the wastewater source with anaerobic bacteria. In addition, the anaerobic tank is connected to a solid-liquid separator, and supplies raw water or treated water to the anaerobic tank so as to assist the removal of solid matter from the system. The anaerobic tank is not particularly limited as long as it fulfills these functions, and various configurations can be adopted.
As shown in FIGS. 2 and 3, the anaerobic tank typically has a cylindrical shape and is provided with an anaerobic bacterium inside. The anaerobic tank includes a submerged pump and a transfer pipe connected to the submerged pump. What is necessary is just to set it as the structure connected with the separator.

[Anoxic tank]
The anoxic tank functions to purify the nitrogen components in the wastewater supplied from the anaerobic tank by denitrifying bacteria. The anaerobic tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted.
As shown in FIGS. 2 and 3, the anoxic tank typically has a cylindrical shape and may be configured to have denitrifying bacteria inside.

[Aerobic tank]
The aerobic tank functions to purify organic matter from the wastewater supplied from the anoxic tank by aerobic bacteria. The aerobic tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted. As such aerobic bacteria, for example, Bacillus subtilis, polyphosphate accumulating bacteria (PAO), nitrifying bacteria described later, and the like can be used.
The aerobic tank typically has a cylindrical shape as shown in FIGS. 2 and 3 and may be configured to have aerobic bacteria inside.

[Accelerated oxidation tank]
The accelerated oxidation tank performs the function of purifying the wastewater supplied from the aerobic tank by oxidative decomposition and the function of returning the solid matter flowing into and generated by the scum pump to the anaerobic tank. The accelerated oxidation tank is not particularly limited as long as it fulfills such a function, and various types of structures can be adopted.
In the accelerated oxidation tank, since various reactions such as OH Radical (simply abbreviated as “hydroxyl radical”) are made, it is preferable to use a material that is highly resistant to radical reaction. It is preferable to use a stainless steel material.

The oxidative decomposition in the accelerated oxidation tank is not particularly limited as long as oxidative decomposition is possible, and various methods can be adopted.
For the method of accelerated oxidation, supply of ozone (O ₃ ), supply of hydrogen peroxide (H ₂ O ₂ ), supply of high molecular organic acid (high electron density organic acid), UV irradiation, ultrasonic equipment, etc. Can be used alone or in combination. Thereby, the effect that accelerated oxidation can be performed effectively is acquired.
The polymer organic acid is not particularly limited as long as it is an organic acid having a high electron density that adjusts the pH in the tank and generates radicals by reaction with ozone. Can be used. As such a high molecular organic acid, fulvic acid (humic acid) and humic acid (humic acid) can be typically used, and it is preferable that at least one or more of these are included.
As exemplified by the following formula, the high-molecular organic acid generates radicals such as hydroxyl radicals through an electron transfer reaction with ozone, and can promote the oxidation reaction in the accelerated oxidation tank.

(Formula 1) O ₃ + high electron density organic acid → O ₃ .organic acid (ozone adduct organic acid)
(Formula 2) O ₃ .organic acid (ozone adduct organic acid) → O ₃ ⁻ + organic acid ⁺
(Formula 3) O ₃ ⁻ + H ⁺ → HO ₃ → OH + O ₂

The oxidative decomposition in the accelerated oxidation tank is preferably performed by further combining electrolysis. According to such a preferable configuration, an effect that the oxidative decomposition in the accelerated oxidation tank can be performed more efficiently is obtained.
In this case, the accelerated oxidation tank is preferably provided with an electrolysis tank for electrolysis at the center thereof. According to such a preferable configuration, it is possible to separate the function of decomposition by accelerated oxidation at the center and the function of floating separation at the outside, so that the oxidative decomposition of solid wastewater and the removal of solid matter can be performed efficiently. The effect of being able to be obtained.

In the present invention, it is preferable to further include a microbubble generator and generate microbubbles at the bottom of the accelerated oxidation tank. According to such a preferable configuration, it is possible to float the solid matter flowing into and generated in the accelerated oxidation tank and to easily return the solid matter to the anaerobic tank by the scum pump, thereby promoting the removal of the solid matter from the system. The effect that it can be obtained.
The microbubble generator is not particularly limited as long as microbubbles can be generated at the bottom of the accelerated oxidation tank, and those having various performances can be adopted and installed at various positions. be able to. Typically, the microbubble generator can be installed at the top of the accelerated oxidation tank as shown in FIGS.

  In the present invention, the accelerated oxidation tank and the electrolysis tank are preferably formed in concentric cylindrical shapes. According to such a preferable configuration, it is possible to make the water flow to the upper part due to the microbubbles generated at the bottom of the accelerated oxidation tank reach the upper part with less resistance, so that the floating separation of solids can be promoted. The effect that it can be obtained.

Through this series of accelerated oxidations, it is possible to intentionally generate hydroxyl radicals and improve / promote oxidizing power.
That is, by using ozone, hydrogen peroxide, and ultraviolet rays (UV) as shown in FIG. 5 in combination, hydroxyl radicals, which are powerful oxidants, are generated, and hardly decomposed pollutants in water are decomposed. It can be removed. In particular, it can be expected to exhibit excellent effects in the decomposition and removal of fine pollutants such as dioxins, environmental hormones, and agricultural chemicals.
Furthermore, since the main product after the decomposition by ozone, hydrogen peroxide, UV, or the like is oxygen or water, there is an effect that almost no secondary waste is generated.
In addition, by using hydroxyl radicals generated in the accelerated oxidation tank, it is possible to bring about effects such as decolorization and deodorization in wastewater, COD reduction, and sterilization.

[First membrane separation tank]
The first membrane separation tank functions to purify the wastewater supplied from the accelerated oxidation tank by membrane separation. The first membrane separation tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted.
In addition, the first membrane separation tank has properties as a so-called coarse separation as compared with the second membrane separation tank described later. As the membrane used in the first membrane separation tank or the second membrane separation tank, An MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), NF membrane (nanofiltration membrane) or RO membrane (reverse osmosis membrane) may be used in appropriate combination. Typically, a UF membrane may be used in the first membrane separation tank.

[Ozone contact tank]
The ozone contact tank functions to purify the wastewater supplied from the first membrane separation tank with ozone. The ozone contact tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted.

[Bioactive activated carbon tank]
The biological activated carbon tank functions to purify the wastewater supplied from the ozone contact tank with biological activated carbon. The biological activated carbon tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted.

[Second membrane separation tank]
The second membrane separation tank functions to purify the wastewater supplied from the biological activated carbon tank by membrane separation. The second membrane separation tank is not particularly limited as long as it fulfills such a function, and various configurations can be adopted.
The second membrane separation tank functions as an outlet for finally discharging the treated water to the outside of the system, and the membrane to be used can be appropriately selected according to the use application of the discharged treated water.

<< II. Embodiment >>
[Embodiment 1]
Hereinafter, the configuration of the wastewater purification system according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5.

  FIG. 1 is a conceptual diagram showing the configuration and flow of a wastewater purification system according to Embodiment 1 of the present invention, FIG. 2 is an elevation view showing the overall configuration of the wastewater purification system, and FIG. 4 is a plan view showing the overall configuration, FIG. 4 is a diagram showing an accelerated oxidation tank constituting the wastewater purification system ((a) is an elevation view, (b) is a plan view), and FIG. 5 is the wastewater purification system. It is an elevational view showing an accelerated oxidation circulator (microbubble generator) to be configured.

As shown in FIG. 1 to FIG. 3, the wastewater purification system 1 of the present embodiment is arranged in order from the upstream side (sewage generation source side), and wastewater (raw water) supplied from the wastewater generation source. Purification process in the raw water collection tank 2 (not shown in FIGS. 2 and 3), the anaerobic tank 3 in which the waste water purified in the raw water collection tank 2 is purified by anaerobic bacteria, and the anaerobic tank 3 The anaerobic tank 4 for purifying the sewage wastewater treated by denitrifying bacteria, the aerobic tank 5 for purifying the sewage wastewater purified by the anaerobic tank 4 by aerobic bacteria, and the aerobic tank 5 The oxidative decomposition tank 6 for purifying the sewage wastewater by oxidative decomposition, the first membrane separation tank 7 for purifying the sewage wastewater purified by the accelerated oxidation tank 6 by membrane separation, and the first membrane separation tank 7 for purification The ozone contact tank 8 that purifies the treated wastewater with ozone and the ozone contact tank 8 The biological activated carbon tank 9 that purifies the wastewater that has been treated with biological activated carbon, and the second membrane separation tank 10 that purifies the wastewater that has been purified in the biological activated carbon tank 9 by membrane separation (in FIGS. 2 and 3) And a treated water storage tank 11 (not shown in FIG. 2) for storing treated water obtained by purification in the second membrane separation tank 10.
The raw water collecting tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5, and the accelerated oxidation tank 6 are each composed of a cylindrical tank, and these are placed vertically.
The first membrane separation tank 7, the ozone contact tank 8, the biological activated carbon tank 9, the second membrane separation tank 10, and the treated water storage tank 11 are each composed of a rectangular tube tank, and these are also placed vertically.
In addition, it is not necessary to limit in particular about the raw material of these cylindrical tanks and square cylinder tanks, and what is necessary is just to use the thing made from PVC (polyvinyl chloride) typically.
Further, in the accelerated oxidation tank 6 and the ozone contact tank 8, it is necessary to use a material having high resistance to radical reaction or the like, and typically, a stainless material or the like may be used.

Each of these tanks is arranged close to any other or a plurality of tanks. The anaerobic tank 3 and the anaerobic tank 4, and the anoxic tank 4 and the aerobic tank 5 are directly connected to each other through the communication holes 12 and 13 at the bottom. Also, the aerobic tank 5, the accelerated oxidation tank 6, the accelerated oxidation tank 6, the first membrane separation tank 7, the ozone contact tank 8, the biological activated carbon tank 9, the biological activated carbon tank 9, the second membrane separation tank 10, and the second The membrane separation tank 10 and the treated water storage tank 11 are communicated with each other via communication pipes 14, 15, 16 and the like at the upper part. Here, the communication pipes 14, 15, 16 and the like are provided at substantially the same height from the bottom surface of each tank, so that the water level in each tank is kept the same.
With the above configuration, it is possible to move the treated water by the principle of natural freight according to gravity, and to function as a self-contained wastewater purification system with the minimum energy for movement.
Further, since the tanks are arranged close to each other, the positional deviation between the tanks can be almost eliminated and the length of the pipe can be shortened as much as possible. With this configuration, it is possible to realize a wastewater purification system that is extremely resistant to displacement and distortion of piping.

In the sewage drainage purification system 1 of this embodiment, when a certain amount of sewage (raw water) accumulates in the raw water collection tank 2, a sewage pump (not shown) is automatically activated, and the sewage drainage in the raw water collection tank 2 Is configured to be pumped to the anaerobic tank 3 through the transfer pipe 17. The wastewater pumped up in the anaerobic tank 3 is passed through the communication holes 12 and 13 and the communication pipes 14 and 15 in the order of the anaerobic tank 4, the aerobic tank 5, the accelerated oxidation tank 6, and the first membrane separation tank 7. Moving. Thus, when the level of the wastewater in the raw water collecting tank 2 rises, the wastewater automatically moves in the order of the anaerobic tank 3, the anaerobic tank 4, the aerobic tank 5, and the first membrane separation tank 7. , No problem arises in the flow of sewage even if a flow control tank is not provided separately. As a result, the wastewater purification system can be made compact.
Further, the waste water in the first membrane separation tank 7 is configured to be pumped up to the ozone contact tank 8 by a self-priming pump 18. And the wastewater pumped up by the ozone contact tank 8 moves in order of the biological activated carbon tank 9, the 2nd membrane separation tank 10, and the treated water storage tank 11 via the communicating pipe 16 grade | etc.,. Thus, the waste water in the first membrane separation tank 7 automatically moves in the order of the ozone contact tank 8, the biological activated carbon tank 9, the second membrane separation tank 10, and the treated water storage tank 11. Even if there is no separate installation, there will be no problem with the flow of sewage. As a result, the wastewater purification system can be made compact.
Here, the case where the wastewater in the first membrane separation tank 7 is configured to be pumped up to the ozone contact tank 8 by the self-priming pump 18 has been described as an example. It is not limited. For example, a communication hole (not shown) for moving the waste water after the first membrane separation treatment to the ozone contact tank 8 according to gravity may be provided at the bottom.

  The raw water collecting tank 2 has a screen function for removing contaminated solids from sewage (raw water) supplied from a sewage generation source. Then, the wastewater after the removal of contaminated solids is purified by receiving anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria, etc. in anaerobic tank 3, anoxic tank 4 and aerobic tank 5. Is done.

Anaerobic bacteria are introduced into the anaerobic tank 3. Then, the wastewater pumped up from the raw water collecting tank 2 to the anaerobic tank 3 is subjected to purification treatment in the anaerobic tank 3 by receiving anaerobic decomposition (reduction reaction) by anaerobic bacteria.
Moreover, in the anaerobic tank 3, the submersible pump 19 started intermittently is installed. The submersible pump 19 is connected to one end of a first transfer pipe 21 whose other end is connected to an inlet of a solid-liquid separator (decanter) 20. One end of the second transfer pipe 22 whose end is located in the anoxic tank 4 is connected. Thereby, the fine solid contained in the waste water pumped up in the anaerobic tank 3 can be discharged and removed from the discharge port of the solid-liquid separator 20.
In FIG. 2, reference numeral 23 denotes an agitation pump for agitating the inside of the anaerobic tank 3 in order to promote the anaerobic decomposition treatment of organic substances by the anaerobic bacteria in the anaerobic tank 3 and the phosphorus treatment by the PAO bacteria returned from the aerobic tank. Is shown.

The wastewater discharged in the anaerobic tank 3 is moved to the anaerobic tank 4 through the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed in the upper part of the anaerobic tank 4. The other end of the first return pipe 25 is connected to the inlet of the self-priming pump 24 and the other end is located in the aerobic tank 5 at the rear stage. Is connected to one end of the second return pipe 26 located on the water surface of the anoxic tank 4. As a result, nitrate nitrogen and nitrite nitrogen were returned to the anaerobic tank 4 by nitrification of ammonia nitrogen by the nitrifying bacteria grown in the aerobic tank 5 and propagated in the anoxic tank. Contact with denitrifying bacteria in anoxic condition. Then, denitrifying bacteria perform denitrification using the organic component in the wastewater as a hydrogen donor, so that nitrate nitrogen in the wastewater is changed to nitrogen gas and removed.
In FIG. 2, reference numeral 27 indicates a stirring pump that stirs the inside of the anoxic tank 4 in order to promote the nitrogen removing process in the anoxic tank 4.

The dirty wastewater purified in the anaerobic tank 4 is moved to the aerobic tank 5 through the communication hole 13. The aerobic tank 5 is charged with nitrifying bacteria which are aerobic bacteria. The wastewater purified in the anaerobic tank 4 is aerated in the aerobic tank 5 and oxidative decomposition of organic substances is performed by aerobic bacteria introduced and cultured in the aerobic tank 5, and ammonia is converted into ammonia. Nitrification and nitric acid are performed by oxidizing bacteria and nitrite oxidizing bacteria.
A self-priming pump 28 is installed above the oxygen-free tank 4. One end of a third return pipe 29 whose other end is located in the aerobic tank 5 is connected to the inlet of the self-priming pump 28, and the other end is anaerobic to the outlet of the self-priming pump 28. One end of a fourth return pipe 30 located just above the water surface of the tank 3 is connected. Thereby, since a series of purification processes in the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5 can be repeatedly performed, it is possible to improve the quality of the purification process.
The aerobic tank 5 includes an upstream aerobic tank 5a and a downstream aerobic tank 5b. The anaerobic tank 4 and the upstream aerobic tank 5a are directly connected to each other through the communication hole 13 at the bottom. The other end of the first return pipe 25 is located in the upstream aerobic tank 5a. The other end of the third return pipe 29 is located in the downstream aerobic tank 5b.
Moreover, in the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5, it is devised so that the activation of microorganisms and the heat insulation and heat insulation effect can be enhanced through far infrared rays.

The wastewater that has been purified in the aerobic tank 5 is moved to the accelerated oxidation tank 6 through the communication pipe 14. The sewage wastewater purified in the aerobic tank 5 is purified in the accelerated oxidation tank 6 by oxidative decomposition.
As shown in FIGS. 2 to 4, a scum pump 31 is suspended in the accelerated oxidation tank 6, and the other end of the scum pump 31 has a fifth return pipe 32 positioned immediately above the water surface of the anaerobic tank 3. One end is connected. As a result, the fine solids flowing into and generated in the accelerated oxidation tank 6 are returned to the anaerobic tank 3 and can be discharged and removed from the discharge port of the solid-liquid separator 20.

  As shown in FIGS. 2 to 5, the wastewater purification system 1 of the present embodiment includes an accelerated oxidation circulation device (microbubble generator) 34 and generates microbubbles at the bottom of the accelerated oxidation tank 6. Have been able to. According to such a configuration, the fine solids flowing into and generated in the accelerated oxidation tank 6 can be floated and easily returned to the anaerobic tank 3 by the scum pump 31, so that the removal of the fine solids from the system can be promoted. .

More specifically, the accelerated oxidation circulation device (microbubble generator) 34 is installed in the accelerated oxidation circulation device main body 35 and the accelerated oxidation tank 6, and is connected to one end of the accelerated oxidation circulation device main body 35 via the pumping pipe 36. And a discharge pipe 38 connected to the other end of the promoted oxidation circulator main body 35 and having a microbubble discharge part 38a at the tip disposed at the bottom of the promoted oxidation tank 6. .
The accelerated oxidation circulation device main body 35 includes a fine bubble generating nozzle 39 connected to the pumping pipe 36, and a UV lamp 40 and a TiO ₂ ball 41 arranged in this order between the fine bubble generating nozzle 39 and the discharge pipe 38. A sealed quartz tube 42 and a gas-liquid mixing tube 43 are provided. Hydrogen peroxide (H ₂ O ₂ ), a polymer organic acid (fulvic acid, humic acid, etc.), ozone, etc. are formed in the fine bubble generating nozzle 39. (O ₃ ) can be sent alone or in combination.
In the accelerated oxidation tank 6, an electrolysis tank 33 made of a PVC (polyvinyl chloride) cylindrical tank is concentrically arranged. A TiO2 anode plate 46a, 46b is arranged. The accelerated oxidation tank 6 and the electrolysis tank 33 are directly connected via a communication hole 47 at the bottom. Further, the electrolysis tank 33 and the accelerated oxidation tank 6 are communicated with each other via a communication pipe 48 at the upper part. Here, the communication pipe 48 is provided at a position substantially the same height as the above-described communication pipes 14, 15, 16 and the like.

The accelerated oxidation tank 6 having the above configuration can intentionally generate OH radicals and improve / promote the oxidizing power. In other words, by combining ozone, hydrogen peroxide, and even ultraviolet rays (UV), it is possible to generate hydroxyl radicals, which are powerful oxidants, and to decompose and remove persistent degradable pollutants in water. Become. In particular, it can be expected to exhibit excellent effects in the decomposition and removal of fine pollutants such as dioxins, environmental hormones and agricultural chemicals. In addition, the combination of ozone, hydrogen peroxide, and high-molecular organic acid produces the effect that almost no secondary waste is generated because the main products after decomposition are oxygen and water. Furthermore, by using ozone, it is possible to bring about effects such as decolorization, deodorization, COD reduction, and sterilization in wastewater.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, as described above, by further combining electrolysis, the oxidative decomposition in the accelerated oxidation tank 6 can be performed more efficiently.

As shown in FIGS. 1 to 3, the wastewater purified in the accelerated oxidation tank 6 is moved to the first membrane separation tank 7 through the communication pipe 15. Then, the wastewater purified in the accelerated oxidation tank 6 is purified in the first membrane separation tank 7 by membrane separation.
The first membrane separation tank 7 has a property of so-called rough separation as compared with a second membrane separation tank 10 described later, and a UF membrane (ultrafiltration membrane) 49 is used as a membrane. It has been.
In FIG. 2, reference numeral 50 indicates an air diffuser. The air diffuser 50 functions to supply oxygen to the activated sludge and to clean the membrane surface by the upward flow of bubbles.
In addition, the solid substance trapped in the first membrane separation tank 7 and the peeled biofilm are transferred to the anaerobic tank 3 as backwash water.

The wastewater purified in the first membrane separation tank 7 is pumped up to the ozone contact tank 8 by the self-priming pump 18. Then, the wastewater purified in the first membrane separation tank 7 is purified by ozone in the ozone contact tank 8.
In FIG. 2, reference numeral 51 indicates a submerged pump-type nano-micro bubble injection, and nano-bubbles containing ozone are generated by the nano-micro bubble injection 51, and the first membrane separation tank 7. The sewage wastewater that has been subjected to purification treatment can be further purified.

  The wastewater discharged in the ozone contact tank 8 is moved to the biological activated carbon tank 9 through the communication pipe 16. Then, the wastewater purified by the ozone contact tank 8 is purified by the biological activated carbon 52 in the biological activated carbon tank 9.

As shown in FIG. 1, the waste water purified in the biological activated carbon tank 9 is moved to the second membrane separation tank 10. Then, the wastewater purified in the biological activated carbon tank 9 is purified in the second membrane separation tank 10 by membrane separation.
As the membrane in the second membrane separation tank 10, an MF membrane (microfiltration membrane), an NF membrane (nanofiltration membrane), an RO membrane (reverse osmosis membrane) or the like is used according to the intended use of the treated water obtained.

  As shown in FIGS. 1 and 3, the treated water obtained by purification in the second membrane separation tank 10 is stored in the treated water storage tank 11. The treated water stored in the treated water storage tank 11 may be discharged into a river or the like as long as the water quality conforms to the technical standards specified by a Cabinet Order. Moreover, you may make it process within a site, without discharging to a river etc. (reuse).

  The sewage purification system 1 according to the present embodiment can be applied to, for example, sewage effluent purification supplied from a sewage tank (sewage generation source) in a toilet room. Moreover, as shown in FIG. 6, it can also be applied to the purification treatment of the wastewater supplied from the barn. In this case, the solid solids removed in the raw water collecting tank 2 and the fine solids removed in the anaerobic tank 3 are used. Things can be composted.

[Embodiment 2]
Next, the configuration of the wastewater purification system according to Embodiment 2 of the present invention will be described with reference to FIGS.

  FIG. 7 is a conceptual diagram showing the configuration and flow of the wastewater purification system according to Embodiment 2 of the present invention, FIG. 8 is an elevation view showing the overall configuration of the wastewater purification system, and FIG. FIG. 10 is a plan view showing the overall configuration, FIG. 10 is a diagram showing an accelerated oxidation tank constituting the wastewater purification system ((a) is an elevation view, (b) is a plan view), and FIG. 11 is the wastewater purification system. FIG. 12 is an elevation view of the accelerating oxidizer (microbubble generator) that is configured ((a) is a mixed injection type of ozone gas and hydrogen peroxide solution, (b) is a separate injection type of ozone water and hydrogen peroxide solution), FIG. FIG. 13 is a diagram for explaining the effects resulting from the structure of the accelerated oxidation tank constituting the wastewater purification system.

As shown in FIG. 7 to FIG. 9, the wastewater purification system 53 of the present embodiment is disposed in order from the upstream side (the wastewater generation source side), and the wastewater (raw water) supplied from the wastewater generation source. The raw water collecting tank 2 (not shown in FIG. 8) for purifying the wastewater, the anaerobic tank 3 for purifying the wastewater purified in the raw water collecting tank 2 by anaerobic bacteria, and the soil purified in the anaerobic tank 3 An anaerobic tank 4 for purifying wastewater by denitrifying bacteria, an aerobic tank 5 for purifying wastewater purified by the anaerobic tank 4 by an aerobic bacteria, and wastewater purified by the aerobic tank 5 The oxidation oxidation tank 6 for purification treatment by oxidative decomposition, the biological aeration tank 54 for purification treatment of the wastewater purified by the promotion oxidation tank 6 by biological treatment, and the wastewater wastewater purified by the biological aeration tank 54 as a membrane Purified in the first membrane separation tank 7 to be purified by separation and the first membrane separation tank 7 An ozone contact tank 8 the treated dirty drain the purifying process with ozone, purification treated dirty waste water with ozone contact tank 8 and a, a biological activated carbon tank 9 to the purification treatment by biological activated carbon.
The wastewater purified in the biological activated carbon tank 9 is stored in a treated water tank 55 (not shown in FIG. 8). The treated water stored in the treated water tank 55 is transferred to the second membrane separation tank 10 (not shown in FIG. 8) and is subjected to membrane separation using an MF membrane (microfiltration membrane), an NF membrane (nanofiltration membrane) or the like. It is purified and returned to the treated water tank 55. And if the water quality conforms to the technical standards stipulated by the Cabinet Order, it will be discharged into rivers. On the other hand, if the water quality does not meet the technical standards stipulated by the Cabinet Order, it is used as industrial water without being discharged into rivers. Moreover, the treated water obtained by purifying by membrane separation using RO membrane (reverse osmosis membrane) in the second membrane separation tank 10 is stored in the purified water tank 56 and used as purified water (drinking water). .

Raw water collection tank 2, anaerobic tank 3, anoxic tank 4, aerobic tank 5, biological aeration tank 54, first membrane separation tank 7, ozone contact tank 8, biological activated carbon tank 9, treated water tank 55, second membrane separation tank 10 and the purified water tank 56 are each composed of a rectangular tank, and these are placed vertically.
The accelerated oxidation tank 6 is composed of a cylindrical tank, and this cylindrical tank is also placed vertically.
In addition, although it is not necessary to specifically limit about the raw material of these cylindrical tanks and square cylinder tanks, what is necessary is just to use the thing made from PVC (polyvinyl chloride) typically.
In the accelerated oxidation tank 6, it is necessary to use a material having high resistance to radical reaction or the like, and typically, a stainless material or the like may be used.

Each of these tanks is arranged close to any other or a plurality of tanks. The anaerobic tank 3, the oxygen-free tank 4, the oxygen-free tank 4, the aerobic tank 5, and the accelerated oxidation tank 6 and the biological aeration tank 54 are directly connected to each other through the communication holes 12, 13, 57 at the bottom. ing. Also, the aerobic tank 5, the accelerated oxidation tank 6, the biological aeration tank 54 and the first membrane separation tank 7, the ozone contact tank 8 and the biological activated carbon tank 9, the treated water tank 55 and the second membrane separation tank 10, and the second membrane The separation tank 10 and the purified water tank 56 are communicated with each other via communication pipes 14, 15, 16 and the like at the upper part. Here, the communication pipes 14, 15, 16 and the like are provided at substantially the same height from the bottom surface of each tank, so that the water level in each tank is kept the same.
With the above configuration, it is possible to move the treated water according to gravity, and to function as a self-contained wastewater purification system with the minimum energy for movement.
Further, since the tanks are arranged close to each other, the positional deviation between the tanks can be almost eliminated and the length of the pipe can be shortened as much as possible. With this configuration, it is possible to realize a wastewater purification system that is extremely resistant to displacement and distortion of piping.

In the sewage drainage purification system 53 of the present embodiment, when a certain amount of sewage (raw water) accumulates in the raw water collection tank 2, a sewage pump (not shown) is automatically activated, and the sewage drainage in the raw water collection tank 2 Is configured to be pumped to the anaerobic tank 3 through the transfer pipe 17. The wastewater pumped up in the anaerobic tank 3 is passed through the communication holes 12 and 13, the communication pipe 14, the communication hole 57 and the communication pipe 15. It moves in order of the tank 54 and the first membrane separation tank 7. Thus, when the level of sewage in the raw water collection tank 2 rises, the sewage automatically becomes anaerobic tank 3, anoxic tank 4, aerobic tank 5, accelerated oxidation tank 6, biological aeration tank 54, Since the membrane moves in the order of the single membrane separation tank 7, no problem arises in the flow of the wastewater even if a flow rate adjusting tank is not provided separately. As a result, the wastewater purification system can be made compact.
Further, the waste water in the first membrane separation tank 7 is configured to be pumped up to the ozone contact tank 8 by a self-priming pump 18. Then, the wastewater pumped up in the ozone contact tank 8 moves in order of the biological activated carbon tank 9, the treated water tank 55, the second membrane separation tank 10, and the purified water tank 56 through the communication pipe 16 and the like. Thus, the wastewater in the first membrane separation tank 7 automatically moves in the order of the ozone contact tank 8, the biological activated carbon tank 9, the treated water tank 55, the second membrane separation tank 10, and the purified water tank 56. Even if there is no separate adjustment tank, there will be no problem with the flow of sewage. As a result, the wastewater purification system can be made compact.
Here, the case where the wastewater in the first membrane separation tank 7 is configured to be pumped up to the ozone contact tank 8 by the self-priming pump 18 has been described as an example. It is not limited. For example, a communication hole (not shown) for moving the waste water after the first membrane separation treatment to the ozone contact tank 8 according to gravity may be provided at the bottom.

  The raw water collecting tank 2 is provided with a drum screen (not shown) and functions to remove contaminated solids from the wastewater (raw water) supplied from the wastewater generation source. Then, the wastewater after the removal of contaminated solids is purified by receiving anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria, etc. in anaerobic tank 3, anoxic tank 4 and aerobic tank 5. Is done.

Anaerobic bacteria are introduced into the anaerobic tank 3. In FIG. 8, reference numeral 58 indicates a microorganism carrier on which anaerobic bacteria are fixed. Then, the wastewater pumped up from the raw water collecting tank 2 to the anaerobic tank 3 is subjected to purification treatment in the anaerobic tank 3 by receiving anaerobic decomposition (reduction reaction) by anaerobic bacteria.
Moreover, in the anaerobic tank 3, the submersible pump 19 started intermittently is installed. The submersible pump 19 is connected to one end of a first transfer pipe 21 having the other end connected to the inlet of the solid-liquid separator 20, and the outlet of the solid-liquid separator 20 has no other end. One end of the second transfer pipe 22 located in the oxygen tank 4 is connected. Thereby, the fine solid contained in the waste water pumped up in the anaerobic tank 3 can be discharged and removed from the discharge port of the solid-liquid separator 20.

The wastewater discharged in the anaerobic tank 3 is moved to the anaerobic tank 4 through the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed in the upper part of the anaerobic tank 4. The other end of the first return pipe 25 is connected to the inlet of the self-priming pump 24 and the other end is located in the aerobic tank 5 at the rear stage. Is connected to one end of a second return pipe 26 located in the oxygen-free tank 4. As a result, the nitrifying bacteria grown in the aerobic tank 5 are also returned to the anaerobic tank 4, and the wastewater purified in the anaerobic tank 3 and the denitrifying bacteria come into contact with each other in an oxygen-free state. The wastewater purified in the anaerobic tank 3 is denitrified by the denitrifying bacteria grown in the anaerobic tank using the organic component in the wastewater as a hydrogen donor, so that nitrate nitrogen in the wastewater is removed. It is changed to nitrogen gas and removed.
In FIG. 2, reference numeral 59 indicates a microorganism carrier to which nitrifying bacteria are fixed. Reference numeral 60 denotes a downward stirring pump that stirs the oxygen-free tank 4 in order to make the activated sludge concentration in the oxygen-free tank 4 uniform.

The dirty wastewater purified in the anaerobic tank 4 is moved to the aerobic tank 5 through the communication hole 13. The aerobic tank 5 is charged with nitrifying bacteria which are aerobic bacteria. The wastewater purified in the anaerobic tank 4 is aerated in the aerobic tank 5 and oxidative decomposition of organic substances is performed by aerobic bacteria introduced and cultured in the aerobic tank 5, and ammonia is converted into ammonia. Nitrification and nitric acid are performed by oxidizing bacteria and nitrite oxidizing bacteria.
In FIG. 2, reference numeral 61 indicates a microorganism carrier to which nitrifying bacteria are fixed.
A self-priming pump 28 is installed above the oxygen-free tank 4. One end of a third return pipe 29 whose other end is located in the aerobic tank 5 is connected to the inlet of the self-priming pump 28, and the other end is anaerobic to the outlet of the self-priming pump 28. One end of a fourth return pipe 30 located just above the water surface of the tank 3 is connected. Thereby, since a series of purification processes in the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5 can be repeatedly performed, it is possible to improve the quality of the purification process.
The aerobic tank 5 includes an upstream aerobic tank 5a and a downstream aerobic tank 5b. The anaerobic tank 4 and the upstream aerobic tank 5a are directly connected to each other through the communication hole 13 at the bottom. The other end of the first return pipe 25 is located in the upstream aerobic tank 5a. The other end of the third return pipe 29 is located in the downstream aerobic tank 5b.
Further, in the anaerobic tank 4 and the aerobic tank 5, the far-infrared lamp is devised so that the activation of microorganisms and the heat insulation and heat insulation effect can be enhanced.

The wastewater that has been purified in the aerobic tank 5 is moved to the accelerated oxidation tank 6 through the communication pipe 14. The sewage wastewater purified in the aerobic tank 5 is purified in the accelerated oxidation tank 6 by oxidative decomposition.
As shown in FIGS. 8 to 10, a scum pump 31 is suspended in the accelerated oxidation tank 6, and the other end of the scum pump 31 has a fifth return pipe 32 positioned directly above the water surface of the anaerobic tank 3. One end is connected. As a result, the fine solids flowing into and generated in the accelerated oxidation tank 6 are returned to the anaerobic tank 3 and can be discharged and removed from the discharge port of the solid-liquid separator 20.

  As shown in FIG. 8 to FIG. 11A, the wastewater purification system 53 of this embodiment includes an in-line accelerated oxidation device (microbubble generator) 62, and microbubbles are generated in the accelerated oxidation tank 6. It can be generated. And according to this structure, since the fine solid substance which flowed in and generate | occur | produced in the acceleration | stimulation oxidation tank 6 is floated and it becomes easy to return to the anaerobic tank 3 by the scum pump 31, it promotes the removal of the fine solid substance from a system. Can do.

More specifically, the in-line promoted oxidizer (microbubble generator) 62 is installed in the promoted oxidizer main body 63 and the promoted oxidizer tank 6 and connected to one end of the promoted oxidizer main body 63 via the pumping pipe 64. A submersible pump 65 and a discharge pipe 66 connected to the other end of the main body 63 of the oxidizer.
The promoted oxidizer main body 63 includes an injected nano-micro bubble generating nozzle 67 connected to the pumping pipe 64, and a gas-liquid mixing tube 68 disposed in this order between the nano-micro bubble generating nozzle 67 and the discharge pipe 66. , A cylindrical ultrasonic jet vibrator 69, and ozone (O ₃ ) gas and hydrogen peroxide water (H ₂ O ₂ ) can be sent alone or in combination to the nano-microbubble generating nozzle 67 portion. Has been.
In the accelerated oxidation tank 6, an electrolysis tank 33 comprising a cylindrical tank is concentrically arranged. On the inner peripheral surface of the electrolysis tank 33, TiO2 anode and cathode plates 46a and 46b are arranged. The accelerated oxidation tank 6 and the electrolysis tank 33 are directly connected via a communication hole 47 at the bottom. The submersible pump 65 of the in-line accelerated oxidation apparatus (microbubble generator) 62 is installed at the bottom of the electrolysis tank 33, and the discharge pipe 66 is arranged outside the electrolysis tank 33. 8 and 10, reference numeral 70 indicates humus soil that elutes humic acid, which is an organic acid, in the tank.
The material of the cylindrical tank in the accelerated oxidation tank 6 is not particularly limited, but typically, a material made of PVC (polyvinyl chloride) may be used.

With the accelerated oxidation tank 6 having the above-described configuration, it is possible to intentionally generate hydroxyl radicals and improve / promote the oxidizing power. In other words, by combining ozone, hydrogen peroxide, and even ultraviolet rays (UV), it is possible to generate OH radicals, which are powerful oxidants, and to decompose and remove persistent degradable pollutants in water. Become. In particular, it can be expected to exhibit excellent effects in the decomposition and removal of fine pollutants such as dioxins, environmental hormones, and agricultural chemicals. In addition, since ozone, hydrogen peroxide, ultraviolet (UV), ultrasonic waves, nano-micro bubbles, etc. are used, the main products after decomposition are oxygen and water, so that secondary waste is hardly generated. Is obtained. Furthermore, by using ozone, it is possible to bring about effects such as decolorization, deodorization, COD reduction, and sterilization in wastewater.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, as described above, by further combining electrolysis, the oxidative decomposition in the accelerated oxidation tank 6 can be performed more efficiently.

Furthermore, as shown in FIGS. 11, 12, and 13, according to the combination of the concentric cylindrical accelerated oxidation tank 6, the electrolysis tank 33 and the inline accelerated oxidation apparatus 62, the nano-microbubble generating nozzle 67 and the gas-liquid are combined. The spiral flow generated by the mixing tube 68 and the cylindrical ultrasonic jet vibrator 69 becomes a swirl flow and promotes the reaction. That is, according to the configuration of the accelerated oxidation tank (swirl flow (vortex) type accelerated oxidation tank) 6 of this embodiment provided with the cylindrical electrolysis tank 33 and the in-line accelerated oxidation apparatus 62, the conventional accelerated oxidation tank is used. Since it can be stirred more efficiently, (1) the reaction efficiency with organic substances is good, (2) the reaction speed is fast, (3) there is no reaction blind spot, (4) the amount of required ozone is small, (5) Effects such as low running costs can be obtained.
In this case, the nano-micro bubbles (fine bubbles) become bubbles having a diameter of 10 to 50 μm due to the swirling flow, and the dissolution rate is higher than that of the milli-bubbles of about 1 to 10 mm. That is, according to the structure of the accelerated oxidation tank (swirl flow (vortex) type accelerated oxidation tank) 6 of this embodiment provided with the cylindrical electrolysis tank 33 and the in-line accelerated oxidation apparatus 62, the ozone gas is dissolved. The dissolution rate can be increased without using a pressurized dissolution tank.

  As shown in FIGS. 7 to 9, the wastewater purified in the accelerated oxidation tank 6 is moved to the biological aeration tank 54 through the communication hole 57. Then, the wastewater purified in the accelerated oxidation tank 6 is purified in the biological aeration tank 54 by biological treatment. In FIG. 8, reference numeral 71 indicates a microorganism carrier to which microorganisms used for biological treatment are fixed.

The wastewater purified in the biological aeration tank 54 is moved to the first membrane separation tank 7 through the communication pipe 15. Then, the wastewater purified in the biological aeration tank 54 is purified in the first membrane separation tank 7 by membrane separation.
The first membrane separation tank 7 has a property of so-called rough separation as compared with a second membrane separation tank 10 described later, and a UF membrane (ultrafiltration membrane) 49 is used as a membrane. It has been.
In FIG. 8, reference numeral 50 indicates an air diffuser, and the air diffuser 50 performs the function of supplying the oxygen to the activated sludge and cleaning the membrane surface by the upward flow of bubbles.

The wastewater purified in the first membrane separation tank 7 is pumped up to the ozone contact tank 8 by the self-priming pump 18. Then, the wastewater purified in the first membrane separation tank 7 is purified by ozone in the ozone contact tank 8.
In FIG. 8, reference numeral 51 indicates a submersible pump nano-bubble injection. Nano-bubbles containing ozone are generated by the nano-micro bubble injection 51, and the first membrane separation tank 7. The sewage wastewater that has been subjected to purification treatment can be further purified. Reference numeral 72 indicates a TiO ₂ ball as a photocatalyst, and sterilization can be performed only by irradiating the TiO ₂ ball with ultraviolet rays.

  The wastewater discharged in the ozone contact tank 8 is moved to the biological activated carbon tank 9 through the communication pipe 16. Then, the wastewater purified by the ozone contact tank 8 is purified by the biological activated carbon 52 in the biological activated carbon tank 9.

  Next, as described above, the wastewater purified by the biological activated carbon tank 9 is stored in the treated water tank 55. The treated water stored in the treated water tank 55 is transferred to the second membrane separation tank 10 and purified by membrane separation using an MF membrane (microfiltration membrane), NF membrane (nanofiltration membrane), etc. Will be returned. And if the water quality conforms to the technical standards stipulated by the Cabinet Order, it will be discharged into rivers. On the other hand, if the water quality does not meet the technical standards stipulated by the Cabinet Order, it is used as industrial water without being discharged into rivers. Moreover, the treated water obtained by purifying by membrane separation using RO membrane (reverse osmosis membrane) in the second membrane separation tank 10 is stored in the purified water tank 56 and used as purified water (drinking water). .

  The wastewater purification system 53 of the present embodiment can also be applied to the purification treatment of wastewater supplied from a wastewater tank (sewage generation source) in a toilet room, for example.

In this embodiment, the case of using an in-line accelerated oxidizer mixed with ozone gas and hydrogen peroxide solution has been described as an example. However, the present invention is not necessarily limited to such an accelerated oxidizer. For example, an in-line accelerated oxidizer 73 of the ozone water and hydrogen peroxide solution separation / injection type as shown in FIG. 11B may be used.
More specifically, the in-line promoted oxidizer 73 includes a promoted oxidizer main body 74, a submersible pump 65 installed in the promoted oxidizer tank 6 and connected to one end of the promoted oxidizer main body 74 via a pumping pipe 64. , And a release pipe 66 connected to the other end of the promoted oxidizer body 74.
The promoted oxidizer main body 74 is composed of a nano-micro bubble generating nozzle 67 connected to the pumping pipe 64, an injector 75, a cylindrical type, which are arranged in order between the nano-micro bubble generating nozzle 67 and the discharge pipe 66. And an ultrasonic jet vibrator 69 so that ozone water can be fed into the nano-micro bubble generating nozzle 67 and hydrogen peroxide can be fed into the injector 75, respectively.

As described above, the present invention has been described, but the usefulness of the present invention will be supplementarily described.
In recent years, the following are important technical issues regarding organic matter treatment.
(1) To eliminate chemicals such as polymer flocculants and reduce the amount of industrial waste processed.
(2) In order to solve the global water resource shortage problem, not only the wastewater drainage treatment but also the decomposition and purification treatment to the extent that it can be reused as industrial water.
(3) It must be compact and economical.
(4) It should be possible to purify refractory substances such as decolorization of livestock manure treatment and removal of trace chemical substances and pathogenic microorganisms.

  Conventionally, a microbial treatment system has been adopted for contaminated water treatment. That is, the microbial treatment method is useful in that the wastewater treatment cost is relatively low. However, the microbial treatment method tends to have an enormous amount of equipment, and there is a problem that it is not a thorough treatment method because it cannot decompose difficult-to-decompose substances. Therefore, the development of new treatment methods that can be combined with biological treatment methods is necessary in order to decompose difficult-to-decompose substances that cannot be treated by microbial treatment alone into easily degradable materials that are easy to biodegrade. is necessary.

The ozone treatment method is one of the methods that can be used in combination with biological treatment because the object to be treated is oxidatively decomposed by the strong oxidizing power of ozone.
In particular, the ozone treatment method is a very useful treatment technique for microbial treatment methods that require dissolved oxygen because secondary waste such as sludge does not occur during the treatment and ozone becomes harmless oxygen after the reaction. is there.
However, in the ozone treatment method that uses ozone alone, reducing substances such as nitrite nitrogen and organic substances in the treated water react with ozone and disappear, while there are substances that are less reactive with ozone and decompose. However, there is a problem in that there are substances that are difficult to handle.

On the other hand, since hydroxyl radicals have a wider range of decomposable substances and higher decomposability than ozone, so-called accelerated oxidation method (AOP) using hydroxy radicals has been developed.
However, various methods have been tried to stably generate hydroxyl radicals that are the basis of the accelerated oxidation method (AOP), but this has not been achieved, and research is still ongoing. .

  The present invention overcomes the technical problems in the organic matter treatment described above, and develops and puts to practical use the equipment necessary for the stable generation and use of hydroxyl radicals.

  Embodiment 2 of the present invention can provide an A2O2 decomposition method. The A2O2 method is described below.

1. Anaerobic tank (A) + Oxygen-free tank (A) + Aerobic tank (O) + (Accelerated oxidation tank) + Biological aeration tank (O)
The A2O2 method is a treatment method in which a biological aeration tank is newly provided after accelerated oxidation treatment from the biological treatment method of A2O method. By placing an anaerobic tank in front of the solid-liquid separator, the PAO bacteria that have excessive intake of floating slats and phosphorus are returned to the raw water anaerobic tank. In addition, an oxygen-free tank is provided in the previous stage of the accelerated oxidation tank, biological nitrogen and phosphorus are removed, and organic matter is used as a carbon source necessary for nitrogen removal, so that the injection of methanol can be omitted. Furthermore, by providing an accelerated oxidation tank and combining it with a biological treatment system, it has the following advantages and technical features.
(1) Conventional biological treatments such as the activated sludge method require post-aeration precipitation and dehydration, but the slats are floated by nano-microbubbles in the accelerated oxidation tank, so that precipitation and dehydration are no longer necessary.
(2) Biological treatment of hydrogen peroxide in the accelerated oxidation tank, and ozone and hydrogen peroxide will eventually become oxygen and maintain a high oxygen concentration in the treated water. ) Is available.
(3) It provides a new method for generating hydroxyl radicals, ozone + polymer organic acid catalyst. In other words, humic acid and fulvic acid are released by suspending humus in the accelerated oxidation tank. Alternatively, liquid humic acid (Fumvic Acid) and fulvic acid (Fulvic Acid) are supplied directly, thereby catalyzing hydroxyl radical generation.
(4) Since the slats are floated using nano-micro bubbles in the accelerated oxidation tank and can be separated with a scum pump, no precipitation tank and dehydration process are required.
(5) Development of an integrated in-line accelerated oxidation system optimized for accelerated oxidation tanks.
(6) Development of an integrated gas-liquid injection method with an injector.
(7) As a structural feature of the accelerated oxidation tank, it will be cylindrical and create a swirling flow.
(8) Efficient dissolution can be achieved by the nano-micro bubble generation nozzle, eliminating the need for a conventional high-pressure tank to increase the ozone dissolution rate.

In addition, the present invention makes it possible to make the system compact and improve the purification capability, and has the following advantages and technical features.
(1) Compaction such as aeration tank capacity, aeration time, and piping omitted.
(2) No secondary waste such as purification by-products and precipitates.
(3) Reduce industrial waste and solve global water shortages.
(4) Ideal for industrial water because it eliminates chemical components such as polymer flocculants (for eliminating bulking and antifoaming agents) and leaves no chemical components in the final treated water.
(5) The solid matter after solid-liquid separation of livestock manure improves the quality of organic fertilizer.
(6) When a flocculant is required, develop and use a flocculent biopolymer (microbial flocculant).

1,53 Wastewater purification system 3 Anaerobic tank 4 Oxygen-free tank 5 Aerobic tank 6 Promoted oxidation tank 12, 13 communication hole 14 communication pipe 19 Submersible pump 20 Solid-liquid separator (decanter)
21 First transfer pipe 22 Second transfer pipe 31 Scum pump 32 Fifth return pipe

Claims (12)

An anaerobic tank that purifies the wastewater supplied from the wastewater source by anaerobic bacteria;
An anaerobic tank that purifies the wastewater purified in the anaerobic tank by denitrifying bacteria;
An aerobic tank for purifying the wastewater purified in the anaerobic tank with an aerobic bacterium,
An accelerated oxidation tank that purifies the wastewater purified by the aerobic tank by oxidative decomposition;
With
A wastewater purification system in which each of these tanks is arranged close to any other tank or a plurality of tanks, and the water level in each tank is kept the same.
In the anaerobic tank, an intermittently activated submersible pump is installed,
The submersible pump is connected to one end of a first transfer pipe whose other end is connected to the inlet of the solid-liquid separator,
The outlet of the solid-liquid separator is connected to one end of a second transfer pipe whose other end is located in the oxygen-free tank,
A scum pump is suspended in the accelerated oxidation tank,
The scum pump is connected to one end of a return pipe whose other end is located in the anaerobic tank.   The oxidative decomposition in the accelerated oxidation tank is performed by any one or a combination of ozone supply, hydrogen peroxide supply, polymer organic acid supply, UV irradiation, and ultrasonic jet. The wastewater purification system according to 1.   The wastewater purification system according to claim 2, wherein the high-molecular organic acid contains at least one or more of fulvic acid and humic acid.   The wastewater purification system according to claim 2 or 3, wherein the oxidative decomposition in the accelerated oxidation tank is performed by further combining electrolysis.   5. The wastewater purification system according to claim 4, wherein the accelerated oxidation tank includes an electrolysis tank at the center thereof.   The wastewater purification system according to any one of claims 1 to 5, further comprising a microbubble generator, wherein solids are suspended by generating microbubbles at a bottom of the accelerated oxidation tank. .   The wastewater purification system according to claim 5 or 6, wherein the accelerated oxidation tank and the electrolysis tank are formed in a concentric cylindrical shape. A first membrane separation tank for purifying the wastewater purified in the accelerated oxidation tank by membrane separation;
An ozone contact tank for purifying the wastewater purified in the first membrane separation tank with ozone;
The wastewater purification system according to any one of claims 1 to 7, further comprising a biological activated carbon tank that purifies the wastewater purified in the ozone contact tank with biological activated carbon.   The wastewater purification system according to claim 8, further comprising a second membrane separation tank for purifying the wastewater purified in the biological activated carbon tank by membrane separation. A biological aeration tank for purifying the wastewater purified in the accelerated oxidation tank by biological treatment;
A first membrane separation tank for purifying the wastewater purified in the biological aeration tank by membrane separation;
An ozone contact tank for purifying the wastewater purified in the first membrane separation tank with ozone;
The wastewater purification system according to any one of claims 1 to 7, further comprising a biological activated carbon tank that purifies the wastewater purified in the ozone contact tank with biological activated carbon. A treated water tank for storing the wastewater purified in the biological activated carbon tank;
The wastewater purification system according to claim 10, further comprising a second membrane separation tank for transferring the treated water stored in the treated water tank and purifying the treated water by membrane separation. The membrane used in the first membrane separation tank or the second membrane separation tank is MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), NF membrane (nanofiltration membrane) or RO membrane (reverse osmosis membrane). The wastewater purification system according to claim 9 or 11, wherein any one or a plurality of the wastewater purification systems is selected.