JP6750930B2 - Wastewater purification system - Google Patents

Description

The present invention relates to a wastewater purification system. More specifically, the present invention relates to a self-contained sewage/wastewater purification system capable of decomposing organic matter such as feces and the like, which is less likely to malfunction and has improved resolution.

It is extremely important to decompose and treat organic matter such as feces (hereinafter simply referred to as “organic matter”).
In other words, if organic matter is left untreated, it becomes environmentally unsanitary, so it is necessary to properly treat it. As a method of treating organic substances, it is possible to use sewage as a method, but in an environment where sewage facilities are not in place, it cannot be sewage. Therefore, in such an environment, it is necessary to decompose and process organic matter on the spot.
However, in an environment without sewage facilities, other facilities such as electricity and water are not available, and the energy and water required for treatment are often insufficient. From this, it is preferable that the method of disassembling and treating is as self-contained as possible. For example, Patent Document 1 discloses a technique related to such a self-contained wastewater purification system.

JP, 2005-127039, A

The technology disclosed in Patent Document 1 (prior art) is a technology developed by the inventor of the present application, and is useful in that the system can be made compact and an economical unpaid water circulating toilet device can be realized. Is.
However, there are still problems in such prior art. That is, in the prior art, as shown in FIG. 14, each tank constituting the system is connected by a pipe. 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. Therefore, the pipes arranged through the gap may be displaced or the joint between the pipe and the tank may be cracked, leading to a failure or the like. As described above, the prior art has a problem that the entire system is poor in durability and maintainability.

Against the background described above, the present invention aims to develop the technique of Patent Document 1 to develop a self-contained wastewater purification system that further improves durability and maintainability, and further improves resolution. ..

As a result of diligent research, the inventor has conceived a wastewater purification system in which the tanks for purification treatment are arranged in close proximity to each other to shorten the length of the pipe as much as possible, and an accelerated oxidation tank is provided to further improve the resolution. And completed the invention.

That is, in the sewage and wastewater purification system of the present invention, by arranging the tanks close to each other, it is possible to almost eliminate the positional deviation between the tanks and to shorten the length of the pipe as much as possible. .. As a result, the sewage purification system of the present invention has a structure in which displacement and distortion of piping are extremely unlikely to occur.
In addition, the sewage purification system of the present invention is configured such that the organic matter is decomposed by oxidation in the accelerated oxidation tank, and the solid matter that has flowed in/generated in the tank is suspended and returned by the scum pump. It enables the floating separation of solid matter.

The present invention has the following configurations.
The first configuration of the present invention is
An anaerobic tank for purifying sewage discharged from a sewage generation source with anaerobic bacteria,
An oxygen-free tank for purifying the wastewater purified by the anaerobic tank with denitrifying bacteria,
An aerobic tank for purifying the wastewater purified by the oxygen-free tank with nitrifying bacteria;
An accelerated oxidation tank for purifying the wastewater purified by the aerobic tank by oxidative decomposition;
Equipped with
A wastewater purification system in which each of these tanks is placed in proximity to any one or more of the other tanks, and the water level in each tank is kept the same,
An intermittent submersible pump is installed in the anaerobic tank,
One end of a first transfer pipe, the other end of which is connected to the inlet of the solid-liquid separator, is connected to the submersible pump,
The solid-liquid separator has an outlet connected to one end of a second transfer pipe, the other end of which is located in the oxygen-free tank.
A scum pump is floated in the accelerated oxidation tank,
The scum pump is connected to one end of a return pipe whose other end is located inside the anaerobic tank.

In the second configuration of the present invention, the oxidative decomposition in the accelerated oxidation tank is performed by any one or a combination of hydrogen peroxide supply, high molecular organic acid (high electron density organic acid) supply, and ozone supply. The wastewater purification system according to the first configuration is characterized by being performed.
In the third constitution of the present invention, the high molecular organic acid contains at least one or more of fulvic acid and humic acid, and the second constitution is the pollution. It is a 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 performed by further combining electrolysis.
A fifth structure of the present invention is the wastewater purification system according to the fourth structure, wherein the accelerated oxidation tank is provided with an electrolysis tank at the center thereof.
A sixth configuration of the present invention further comprises a micro-bubble generator, wherein the solid matter is suspended by generating micro-bubbles at the bottom of the accelerated oxidation tank. It is the wastewater purification system described.
A seventh structure of the present invention is the wastewater purification system according to the fifth or sixth structure, 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 by the accelerated oxidation tank by membrane separation;
An ozone contact tank for purifying the wastewater purified by the first membrane separation tank with ozone,
The biological waste carbon purification system according to any one of the first to seventh configurations, further comprising: a biological activated carbon tank that purifies the waste water purified by the ozone contact tank with biological activated carbon.
The ninth constitution of the present invention further comprises a second membrane separation tank for purifying the wastewater purified by the biological activated carbon tank by membrane separation, and the wastewater described in the eighth constitution. It is a purification system.
A tenth configuration of the present invention is a biological aeration tank for purifying the wastewater purified by the accelerated oxidation tank by biological treatment and a wastewater discharged by the biological aeration tank for purification by membrane separation. A first membrane separation tank, an ozone contact tank for purifying the wastewater purified by the first membrane separation tank with ozone, and an organism for purifying the wastewater purified by 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.
An eleventh configuration of the present invention is that a treated water tank for storing dirty wastewater purified by a biological activated carbon tank and the treated water stored in the treated water tank are transferred to purify the treated water by membrane separation. The wastewater purification system according to the tenth configuration, further comprising a two-membrane separation tank.
In a twelfth configuration of the present invention, 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) to RO membrane (reverse osmosis membrane) or a plurality of them are provided in the wastewater purification system according to the ninth or eleventh configuration.

According to the present invention, it is possible to provide a self-contained sewage and effluent purification system that has evolved the technology of Patent Document 1 to further improve durability and maintainability and further improve resolution.

The conceptual diagram which shows the structure and flow of the wastewater purification system in Embodiment 1 of this invention. The elevation view which shows the whole structure of the wastewater purification system in Embodiment 1 of this 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 accelerated oxidation tank which comprises the wastewater purification system in Embodiment 1 of this invention ((a) is an elevation view, (b) is a top view) The elevation view which shows the accelerated oxidation circulation apparatus (micro bubble generator) which comprises the wastewater purification system in Embodiment 1 of this 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 the present invention. The elevation view which shows the whole structure of the waste water purification system in Embodiment 2 of this invention. The top view which shows the whole structure of the wastewater purification system in Embodiment 2 of this invention. The figure which shows the accelerated oxidation tank which comprises the wastewater purification system in Embodiment 2 of this invention ((a) is an elevation view, (b) is a top view) The elevation view ((a) is an ozone gas and hydrogen peroxide water mixed injection type, (b) is ozone) which shows the accelerated oxidation circulation apparatus (micro bubble generator) which comprises the waste water purification system in Embodiment 2 of this invention. Water and hydrogen peroxide water separate injection type) The figure for demonstrating the effect resulting from the structure of the accelerated 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 accelerated oxidation tank which comprises the waste-water purification system in Embodiment 2 of this invention (the 2). An elevation view showing the overall configuration of a wastewater purification system in the prior art

Hereinafter, the present invention will be described more specifically by using preferred embodiments. However, the following embodiments are merely examples embodying the present invention, and the present invention is not limited thereto.

<<I. Overview of dirty water purification system＞＞
The sewage and wastewater purification system of the present invention is characterized by arranging the respective tanks for purification treatment in close proximity to each other to shorten the length of the pipe as much as possible, and further providing an accelerated oxidation tank to further improve the resolution.

That is, in the sewage and wastewater purification system of the present invention, by arranging the tanks close to each other, it is possible to almost eliminate the positional deviation between the tanks and to shorten the length of the pipe as much as possible. It is a thing.
With these configurations, the sewage and wastewater purification system of the present invention has a structure in which pipe displacement and distortion are extremely unlikely to occur.
In the present invention, “arranged in close proximity” means that the respective tanks are in contact with each other, or that they are so close that the positional deviation between the respective tanks during movement or daily use does not lead to a failure. Is defined.

In addition, the accelerated oxidation tank is configured to decompose organic matter by oxidation, suspend the solid matter that flows into and is generated in the tank, and return it to the anaerobic tank by a scum pump. Decomposition by oxidation and floating separation of solid matter Is possible.

The wastewater purification system of the present invention includes an anaerobic tank, anoxic tank, aerobic tank, and accelerated oxidation tank as essential components. These essential components play a major role in the wastewater purification system for decomposing wastewater and removing solids from the system.
The sewage and drainage purification system of the present invention may include other components. 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 following the accelerated oxidation tank. By including these components, the sewage and wastewater that has been purified by the accelerated oxidation tank is further purified so that it can pass legal regulations or be used as drinking water or wash water. Therefore, it is possible to improve the usefulness of the wastewater purification system of the present invention.

Each tank, which is an essential and optional component in the present invention, is arranged in proximity 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 appropriately arranged, whereby the treated water can be moved between the tanks. Furthermore, the water level is kept the same in each tank. Further, 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 a minimum amount of energy for movement. To be
In the present invention, “holding the same water level” means that the water is the same to the extent that gravity can cause the treated water to move, and in this sense, it does not necessarily mean that the water is strictly the same. Absent.

The polluted water purification system of the present invention can be used for various purposes.
That is, as illustrated in FIG. 6 and the like, it can be used for various applications related to decomposition of organic substances, such as manure treatment in livestock sheds and simple toilets, manure and domestic wastewater treatment in simple houses.

The configuration of each tank in the wastewater purification system of the present invention will be described below.
[Anaerobic tank]
The anaerobic tank functions to purify the sewage discharged from the wastewater generation source by anaerobic bacteria. The anaerobic tank is connected to a solid-liquid separator, and by supplying raw water or treated water to the solid-liquid separator, the anaerobic tank fulfills a function of assisting removal of solids from the system. The anaerobic tank is not particularly limited as long as it fulfills these functions, and various configurations can be adopted.
The anaerobic tank typically has a cylindrical shape, as shown in FIGS. 2 and 3, and is provided with anaerobic bacteria therein, and a submersible pump and a transfer pipe connected to the anaerobic tank are used to form a solid-liquid tank. It may be configured to be connected to the separator.

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

[Aerobic tank]
The aerobic tank functions to purify the wastewater supplied from the anoxic tank with organic substances by aerobic bacteria. The aerobic tank is not particularly limited as long as it performs such a function, and various configurations can be adopted. As such aerobic bacteria, for example, Bacillus subtilis, polyphosphate accumulating bacteria (PAO), nitrifying bacteria described below, 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.

[Promoted oxidation tank]
The accelerated oxidation tank has a function of purifying the wastewater supplied from the aerobic tank by oxidative decomposition and a function of returning the solid matter flowing into and generated in the tank to the anaerobic tank by a scum pump. The accelerated oxidation tank is not particularly limited as long as it performs such a function, and various configurations can be adopted.
Further, in the accelerated oxidation tank, various reactions such as OH Radical (simply abbreviated as “hydroxyl radical”) are performed, so it is preferable to use a material having high resistance 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 the oxidative decomposition is possible, and various methods can be adopted.
Regarding the method of accelerated oxidation, ozone (O ₃ ) supply, hydrogen peroxide (H ₂ O ₂ ) supply, high molecular organic acid (high electron density organic acid) supply, UV irradiation, ultrasonic equipment, etc. Can be used alone or in combination. As a result, the effect that the accelerated oxidation can be effectively performed is obtained.
The high molecular 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 reacting with ozone, and various high molecular organic acids can be used. Can be used. As such a high molecular organic acid, typically, fulvic acid and humic acid can be used, and it is preferable to contain at least one of them.
As shown in the following formula, the high molecular weight organic acid can generate radicals such as hydroxyl radicals through an electron transfer reaction with ozone to 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 this preferable configuration, the effect that the oxidative decomposition in the accelerated oxidation tank can be performed more efficiently can be obtained.
In this case, the accelerated oxidation tank is preferably provided with an electrolysis tank for performing electrolysis at the center thereof. According to such a preferable configuration, it is possible to separate the function of decomposition by the accelerated oxidation in the central part and the function of floating separation in the outside, so that the oxidative decomposition of wastewater and the removal of solid matter can be efficiently performed. The effect that can be obtained is obtained.

In the present invention, it is preferable that a microbubble generator is further provided to generate microbubbles at the bottom of the accelerated oxidation tank. According to such a preferable configuration, it is possible to suspend the solid matter that has flowed in and generated in the accelerated oxidation tank and return it to the anaerobic tank by the scum pump, so that the removal of the solid matter from the system is promoted. The effect that can be obtained is obtained.
The microbubble generator is not particularly limited as long as the generation of microbubbles at the bottom of the accelerated oxidation tank is possible, and various performances can be adopted and installed at various positions. be able to. The micro-bubble generator can be typically 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 this preferable configuration, the water flow to the upper part due to the microbubbles generated at the bottom of the accelerated oxidation tank can reach the upper part with less resistance, so that the floating separation of solid matter can be promoted. The effect that can be obtained is obtained.

By this series of accelerated oxidation, it becomes possible to intentionally generate hydroxyl radicals and improve/promote the oxidizing power.
That is, by using ozone, hydrogen peroxide, and also ultraviolet rays (UV) as shown in FIG. 5 in combination, hydroxyl radicals, which are strong oxidizers, are generated to decompose and decompose persistent pollutants in water. It can be removed. In particular, it can be expected to exert an excellent effect in decomposing/removing minute pollutants such as dioxins, environmental hormones, and agricultural chemicals.
Furthermore, since the main products after being decomposed by ozone, hydrogen peroxide, UV, etc. are oxygen and water, it is possible to obtain the effect that almost no secondary waste is generated.
In addition, by using hydroxyl radicals generated in the accelerated oxidation tank, it is possible to simultaneously bring about effects such as decolorization and deodorization in wastewater and wastewater, COD reduction, and sterilization.

[First membrane separation tank]
The first membrane separation tank performs the function of purifying the wastewater discharged 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.
Further, the first membrane separation tank has a so-called rough separation property as compared with a second membrane separation tank described later, and as a membrane used in the first membrane separation tank or the second membrane separation tank, MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), NF membrane (nanofiltration membrane) or RO membrane (reverse osmosis membrane) may be used in appropriate combination. A UF membrane may be typically used in the first membrane separation tank.

[Ozone contact tank]
The ozone contact tank has the function of purifying the wastewater discharged 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 carbon tank]
The biological activated carbon tank has the function of purifying the sewage and 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 fulfills the function of purifying the wastewater discharged 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 intended use of the discharged treated water.

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

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 elevational view showing the overall configuration of the wastewater purification system, and FIG. 3 is a view of the wastewater purification system. FIG. 4 is a plan view showing the entire structure, 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 elevation view which shows the accelerated oxidation circulation device (micro bubble generator) which comprises.

As shown in FIG. 1 to FIG. 3, the wastewater purification system 1 of the present embodiment has wastewater (raw water) supplied from the wastewater source arranged in order from the upstream side (wastewater source side). Raw water collection tank 2 (not shown in FIGS. 2 and 3) for purifying water, anaerobic tank 3 for purifying sewage and wastewater purified by raw water collection tank 2 with anaerobic bacteria, and purification processing for anaerobic tank 3 Anoxic tank 4 that purifies the treated wastewater by denitrifying bacteria, aerobic tank 5 that purifies the wastewater that has been purified by anoxic tank 4 by aerobic bacteria, and that is purified by aerobic tank 5. The accelerated oxidation tank 6 for purifying the treated wastewater by oxidative decomposition, the first membrane separation tank 7 for purifying the wastewater purified by the accelerated oxidation tank 6 by membrane separation, and the first membrane separation tank 7 for purification An ozone contact tank 8 for purifying the treated wastewater treated with ozone, a biological activated carbon tank 9 for purifying the wastewater treated by the ozone contact tank 8 with bioactive carbon, and a biological activated carbon tank 9 were used for purification. A second membrane separation tank 10 (not shown in FIGS. 2 and 3) for purifying dirty wastewater by membrane separation, and a treated water storage tank for storing the treated water obtained by the purification treatment in the second membrane separation tank 10. 11 (not shown in FIG. 2).
The raw water collection tank 2, the anaerobic tank 3, the oxygen-free tank 4, the aerobic tank 5, and the accelerated oxidation tank 6 each consist of a cylindrical tank, which are vertically arranged.
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 formed of a rectangular cylinder tank, and these are also arranged vertically.
There is no particular limitation on the material of the cylindrical tank and the rectangular tube tank, and typically, a material made of PVC (polyvinyl chloride) may be used.
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 and the like, and typically, a stainless material or the like may be used.

Each of these tanks is arranged close to any one or a plurality of other tanks. The anaerobic tank 3 and the anoxic tank 4, and the anoxic tank 4 and the aerobic tank 5 are directly connected to each other through communication holes 12 and 13 at the bottom. Further, the aerobic tank 5 and the accelerated oxidation tank 6, the accelerated oxidation tank 6 and the first membrane separation tank 7, the ozone contact tank 8 and the biological activated carbon tank 9, the biological activated carbon tank 9 and 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 top. Here, the communication pipes 14, 15, 16 and the like are provided at substantially the same height from the bottom surface of each tank, whereby the water level in each tank is kept the same.
With the above configuration, it is possible to move the treated water according to the principle of natural load according to gravity, and it is possible 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, it is possible to almost eliminate the positional deviation between the tanks and to shorten the length of the pipe as much as possible. With such a configuration, it becomes possible to realize a wastewater purification system in which displacement and distortion of the piping are extremely unlikely to occur.

In the wastewater purification system 1 of the present embodiment, when a certain amount of wastewater (raw water) is collected in the raw water collection tank 2, a wastewater pump (not shown) is automatically activated, and the wastewater in the raw water collection tank 2 is discharged. Is pressure-fed to the anaerobic tank 3 via the transfer pipe 17. Then, the wastewater discharged into 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 oxygen-free tank 4, the aerobic tank 5, the accelerated oxidation tank 6, and the first membrane separation tank 7. Moving. Thus, when the water level of the wastewater in the raw water collection tank 2 rises, the wastewater automatically moves in the order of the anaerobic tank 3, the oxygen-free tank 4, the aerobic tank 5, and the first membrane separation tank 7. Even if the flow rate adjusting tank is not provided separately, there will be no problem in the flow of sewage. As a result, the wastewater purification system can be made compact.
Further, the waste water in the first membrane separation tank 7 is pumped up to the ozone contact tank 8 by the self-priming pump 18. Then, the dirty wastewater pumped up to the ozone contact tank 8 moves to the biological activated carbon tank 9, the second membrane separation tank 10, and the treated water storage tank 11 in this order through the communication pipe 16 and the like. In this way, 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 second membrane separation tank 10, and the treated water storage tank 11, so that the flow rate adjustment tank Even if it is not provided separately, there will be no problem in the flow of wastewater. As a result, the wastewater purification system can be made compact.
In addition, 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) may be provided at the bottom for moving the wastewater after the first membrane separation process to the ozone contact tank 8 according to gravity.

The raw water collection tank 2 has a screen function of removing contaminant solids from the wastewater (raw water) supplied from the wastewater generation source. Then, the sewage drainage after the contaminant solids are removed is subjected to anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria in the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5 to be purified. To be done.

Anaerobic bacteria are put in the anaerobic tank 3. Then, the wastewater drained from the raw water collection tank 2 to the anaerobic tank 3 is subjected to anaerobic decomposition (reduction reaction) by anaerobic bacteria in the anaerobic tank 3 to be purified.
A submersible pump 19 that is intermittently activated is installed in the anaerobic tank 3. The submersible pump 19 is connected to one end of a first transfer pipe 21 whose other end is connected to the inlet of a solid-liquid separator (decanter) 20, and the outlet of the solid-liquid separator 20 to another. One end of the second transfer pipe 22 whose end is located in the oxygen-free tank 4 is connected. As a result, the fine solid matter contained in the wastewater pumped up to 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 is a stirring pump that stirs the inside of the anaerobic tank 3 in order to promote anaerobic decomposition treatment of organic substances by anaerobic bacteria in the anaerobic tank 3 and phosphorus treatment by PAO bacteria returned from the aerobic tank Is shown.

The wastewater purified by the anaerobic tank 3 is moved to the oxygen-free tank 4 through the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed above the oxygen-free tank 4. The self-priming pump 24 has an inlet connected to one end of a first return pipe 25, the other end of which is located in the rear aerobic tank 5, and the self-priming pump 24 has an outlet connected to the other end. Is connected to one end of a second return pipe 26 located on the water surface of the oxygen-free tank 4. As a result, nitrate nitrogen and nitrite nitrogen were returned to the anoxic tank 4 by nitrifying the ammonia nitrogen by the nitrifying bacteria grown in the aerobic tank 5, and they were propagated in the anoxic tank. Contact with denitrifying bacteria in anoxic condition. Then, the denitrifying bacteria perform denitrification by using the organic component in the wastewater as a hydrogen donor, whereby the nitrate nitrogen in the wastewater is converted into nitrogen gas and removed.
In FIG. 2, reference numeral 27 indicates a stirring pump for stirring the inside of the oxygen-free tank 4 in order to accelerate the nitrogen removal processing in the oxygen-free tank 4.

The wastewater purified by the oxygen-free 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. Then, the wastewater purified by the anoxic tank 4 is aerated in the aerobic tank 5, and the oxidative decomposition of the organic substances by the aerobic bacteria introduced and cultured in the aerobic tank 5 is performed. Nitrification reaction to form nitric acid and nitrite is performed by oxidizing bacteria and nitrite oxidizing bacteria.
A self-priming pump 28 is installed above the oxygen-free tank 4. The other end is connected to the inflow port of the self-priming pump 28, and the other end is anaerobic at the outflow port of the self-priming pump 28. One end of the fourth return pipe 30 located directly above the water surface of the tank 3 is connected. Thus, a series of purification treatments in the anaerobic tank 3, the oxygen-free tank 4, and the aerobic tank 5 can be repeatedly performed, so that the quality of the purification processing can be improved.
The aerobic tank 5 is composed of an upstream aerobic tank 5a and a downstream aerobic tank 5b. The anoxic tank 4 and the aerobic tank 5a on the upstream side are directly connected to each other at the bottom via the communication hole 13. 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 inside the aerobic tank 5b on the downstream side.
Further, in the anaerobic tank 3, the oxygen-free tank 4, and the aerobic tank 5, it is devised so that the activation of microorganisms and the heat insulation effect can be enhanced through far infrared rays.

The dirty waste water purified in the aerobic tank 5 is moved to the accelerated oxidation tank 6 via the communication pipe 14. Then, the wastewater purified by the aerobic tank 5 is purified by oxidative decomposition in the accelerated oxidation tank 6.
As shown in FIGS. 2 to 4, a scum pump 31 is floated in the accelerated oxidation tank 6, and the other end of the scum pump 31 of the fifth return pipe 32 located directly above the water surface of the anaerobic tank 3. One end is connected. As a result, the fine solid matter that has flowed into and generated in the accelerated oxidation tank 6 can be returned to the anaerobic tank 3 and discharged from the discharge port of the solid-liquid separator 20 to be removed.

As shown in FIGS. 2 to 5, the sewage and wastewater purification system 1 of the present embodiment is provided with the accelerated oxidation circulation device (micro bubble generator) 34, and generates micro bubbles at the bottom of the accelerated oxidation tank 6. Has been made possible. According to this structure, the fine solid matter that has flowed into and generated in the accelerated oxidation tank 6 can be suspended and easily returned to the anaerobic tank 3 by the scum pump 31, so that the removal of the fine solid material from the system can be promoted. ..

More specifically, the accelerated oxidation circulation device (microbubble generator) 34 is installed in the accelerated oxidation circulation device body 35 and the accelerated oxidation tank 6, and one end of the accelerated oxidation circulation device body 35 is provided via a pumping pipe 36. And a submersible pump 37 connected to the main body 35 of the accelerated oxidation circulation device, and a discharge pipe 38 connected to the other end of the main body 35 of the accelerated oxidation circulation device and having a microbubble discharging portion 38a at the tip disposed at the bottom of the accelerated oxidation tank 6. ..
The main body 35 of the accelerated oxidation circulation device 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 order between the fine bubble generating nozzle 39 and the discharge pipe 38. A quartz tube 42 and a gas-liquid mixing tube 43, which are enclosed, are provided, and hydrogen peroxide (H ₂ O ₂ ), high molecular organic acid (fulvic acid, humic acid, etc.), ozone are provided in the fine bubble generating nozzle 39. (O ₃ ) can be sent alone or in combination.
Inside the accelerated oxidation tank 6, an electrolysis tank 33 composed of a cylindrical tank made of PVC (polyvinyl chloride) is concentrically arranged, and on the inner peripheral surface of the electrolysis tank 33, a TiO2 positive cathode plate 46a, 46b is arranged. The accelerated oxidation tank 6 and the electrolysis tank 33 are directly connected to each other at the bottom via the communication hole 47. 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-mentioned communication pipes 14, 15, 16 and the like.

With the accelerated oxidation tank 6 having the above configuration, it is possible to intentionally generate OH radicals and improve/promote the oxidizing power. In other words, it is possible to decompose and remove persistent pollutants in water by generating hydroxyl radicals, which are strong oxidizers, by using ozone, hydrogen peroxide, and ultraviolet (UV) in combination. Become. In particular, it can be expected to exert an excellent effect in decomposing/removing minute pollutants such as dioxins, environmental hormones, and agricultural chemicals. Also, due to the combination of ozone, hydrogen peroxide, and high molecular weight organic acid, the main products after decomposition are oxygen and water, so that the effect that almost no secondary waste is generated is obtained. Furthermore, by using ozone, it is possible to bring about effects such as decolorization and deodorization in wastewater, COD reduction, and sterilization at the same time.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, by further combining electrolysis as described above, the oxidative decomposition in the accelerated oxidation tank 6 can be performed more efficiently.

As shown in FIGS. 1 to 3, the sewage drainage purified by the accelerated oxidation tank 6 is transferred to the first membrane separation tank 7 via the communication pipe 15. Then, the dirty 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 so-called rough separation property as compared with a second membrane separation tank 10 described later, and a UF membrane (ultrafiltration membrane) 49 is used as a membrane (membrane). Has been.
In FIG. 2, reference numeral 50 indicates an air diffusing tube, and the air diffusing tube 50 performs the function of supplying oxygen to the activated sludge and cleaning the membrane surface by the upward flow of bubbles.
The solid matter captured in the first membrane separation tank 7 and the separated biofilm are transferred to the anaerobic tank 3 as backwash water.

The wastewater that has been purified in the first membrane separation tank 7 is pumped to the ozone contact tank 8 by the self-priming pump 18. Then, the wastewater purified by the first membrane separation tank 7 is purified by ozone in the ozone contact tank 8.
In FIG. 2, reference numeral 51 indicates a submersible pump type nano-micro bubble injector, and the nano-micro bubble injector 51 generates ozone-containing nano micro-bubbles to generate the first membrane separation tank 7 The sewage and wastewater that has been purified by the above method can be further purified.

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

As shown in FIG. 1, the wastewater purified by the biological activated carbon tank 9 is moved to the second membrane separation tank 10. Then, the wastewater that has been 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 depending on the intended use of the treated water.

As shown in FIGS. 1 and 3, the treated water obtained by the purification treatment 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 to a river or the like as long as the quality of the water conforms to the technical standards specified by the Cabinet Order. In addition, it may be disposed on site without being discharged to rivers (reuse).

The wastewater purification system 1 of the present embodiment can be applied to, for example, a purification process of wastewater supplied from a wastewater tank (sewage source) in a toilet room. Further, as shown in FIG. 6, it can also be applied to the purification treatment of dirty wastewater supplied from a livestock house, and in this case, contaminant solids removed in the raw water collection tank 2 or fine solids removed in the anaerobic tank 3 Things can be composted.

[Second Embodiment]
Next, the configuration of the wastewater purification system in the second embodiment of the present invention will be described with reference to FIGS. 7 to 13.

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 elevational view showing the overall configuration of the wastewater purification system, and FIG. 9 is the wastewater purification system. 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 and an elevation view showing a constituent accelerated oxidizer (micro bubble generator) ((a) is a mixture injection type of ozone gas and hydrogen peroxide solution, (b) is a separate injection type of ozone water and hydrogen peroxide solution). FIG. 13 is a diagram for explaining the effect resulting from the structure of the accelerated oxidation tank that constitutes the wastewater purification system.

As shown in FIG. 7 to FIG. 9, the wastewater purification system 53 of the present embodiment is a wastewater (raw water) supplied from the wastewater generation source, which is arranged in order from the upstream side (sewage generation source side). Raw water collection tank 2 (not shown in FIG. 8) for purifying the water, anaerobic tank 3 for purifying the wastewater purified by the raw water collection tank 2 with anaerobic bacteria, and dirt purified by the anaerobic tank 3. Anoxic tank 4 for purifying wastewater with denitrifying bacteria, aerobic tank 5 for purifying dirty wastewater purified with anoxic tank 4 with aerobic bacteria, and dirty wastewater purified with aerobic tank 5. Oxidation oxidization tank 6 for purifying sewage by oxidative decomposition, biological aeration tank 54 for purifying effluent wastewater purified by accelerated oxidization tank 6 by biological treatment, and sewage wastewater purified by biological aeration tank 54 The first membrane separation tank 7 for purification treatment by separation, the ozone contact tank 8 for purifying the wastewater wastewater purified by the first membrane separation tank 7 with ozone, and the wastewater wastewater purified by the ozone contact tank 8 And a biological activated carbon tank 9 for purification treatment with biological activated carbon.
The wastewater that has been purified by 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 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. If the water quality meets the technical standards specified by the Cabinet Order, it will be discharged into rivers. On the other hand, if the water quality does not meet the technical standards specified by the Cabinet Order, it will be used as industrial water without being discharged into rivers. The treated water obtained by the purification treatment by the membrane separation using the RO membrane (reverse osmosis membrane) in the second membrane separation tank 10 is stored in the purified water tank 56 and is used as the 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 Each of 10 and the purified water tank 56 is composed of a rectangular tube tank, and these are arranged vertically.
The accelerated oxidation tank 6 is composed of a cylindrical tank, and this cylindrical tank is also placed vertically.
The material of these cylindrical tanks and rectangular cylinder tanks is not particularly limited, but typically, PVC (polyvinyl chloride) may be used.
Further, in the accelerated oxidation tank 6, it is necessary to use a material having high resistance to radical reaction and the like, and typically, a stainless material or the like may be used.

Each of these tanks is arranged close to any one or a plurality of other tanks. The anaerobic tank 3 and the anoxic tank 4, the anoxic tank 4 and 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, and 57 at the bottom. ing. In addition, aerobic tank 5 and accelerated oxidation tank 6, biological aeration tank 54 and first membrane separation tank 7, ozone contact tank 8 and biological activated carbon tank 9, treated water tank 55 and second membrane separation tank 10, and 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 top. Here, the communication pipes 14, 15, 16 and the like are provided at substantially the same height from the bottom surface of each tank, whereby 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 it is possible 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, it is possible to almost eliminate the positional deviation between the tanks and to shorten the length of the pipe as much as possible. With such a configuration, it becomes possible to realize a wastewater purification system in which displacement and distortion of the piping are extremely unlikely to occur.

In the wastewater purification system 53 of the present embodiment, when a certain amount of wastewater (raw water) is accumulated in the raw water collection tank 2, a wastewater pump (not shown) is automatically activated, and the wastewater in the raw water collection tank 2 is discharged. Is pressure-fed to the anaerobic tank 3 via the transfer pipe 17. Then, the sewage discharged into the anaerobic tank 3 passes through the communication holes 12, 13, the communication pipe 14, the communication hole 57 and the communication pipe 15, and the oxygen-free tank 4, the aerobic tank 5, the accelerated oxidation tank 6, the biological aeration. The tank 54 and the first membrane separation tank 7 are moved in this order. In this way, when the water level of the sewage drainage in the raw water collection tank 2 rises, the sewage drainage automatically becomes anaerobic tank 3, anoxic tank 4, aerobic tank 5, accelerated oxidation tank 6, biological aeration tank 54, Since the one membrane separation tank 7 is moved in this order, no problem occurs in the flow of the waste water without the need of separately providing the flow rate adjusting tank. As a result, the wastewater purification system can be made compact.
Further, the waste water in the first membrane separation tank 7 is pumped up to the ozone contact tank 8 by the self-priming pump 18. Then, the dirty waste water pumped up to the ozone contact tank 8 moves to the biological activated carbon tank 9, the treated water tank 55, the second membrane separation tank 10, and the purified water tank 56 in this order through the communication pipe 16 and the like. In this way, 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, so the flow rate is Even if the adjusting tank is not provided separately, there will be no problem in the flow of wastewater. As a result, the wastewater purification system can be made compact.
In addition, 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) may be provided at the bottom for moving the wastewater after the first membrane separation process to the ozone contact tank 8 according to gravity.

The raw water collection tank 2 is provided with a drum screen (not shown) and has a function of removing contaminant solids from the waste water (raw water) supplied from the waste water generation source. Then, the sewage drainage after the contaminant solids are removed is subjected to anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria in the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5 to be purified. To be done.

Anaerobic bacteria are put in the anaerobic tank 3. In FIG. 8, reference numeral 58 indicates a microbial carrier on which anaerobic bacteria are fixed. Then, the wastewater drained from the raw water collection tank 2 to the anaerobic tank 3 is subjected to anaerobic decomposition (reduction reaction) by anaerobic bacteria in the anaerobic tank 3 to be purified.
A submersible pump 19 that is intermittently activated is installed in the anaerobic tank 3. 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. As a result, the fine solid matter contained in the wastewater pumped up to the anaerobic tank 3 can be discharged and removed from the discharge port of the solid-liquid separator 20.

The wastewater purified by the anaerobic tank 3 is moved to the oxygen-free tank 4 through the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed above the oxygen-free tank 4. The self-priming pump 24 has an inlet connected to one end of a first return pipe 25, the other end of which is located in the rear aerobic tank 5, and the self-priming pump 24 has an outlet connected to the other end. Is connected to one end of a second return pipe 26 located in the oxygen-free tank 4. As a result, the nitrifying bacteria that have proliferated in the aerobic tank 5 are also returned to the anoxic tank 4, and the wastewater that has been purified in the anaerobic tank 3 and the denitrifying bacteria come into contact with each other in an anoxic state. Then, the sewage drainage purified in the anaerobic tank 3 is denitrified by the denitrifying bacteria grown in the anoxic tank using the organic component in the sewage drainage 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 microbial carrier on which nitrifying bacteria are fixed. Further, reference numeral 60 indicates 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 wastewater purified by the oxygen-free 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. Then, the wastewater purified by the anoxic tank 4 is aerated in the aerobic tank 5, and the oxidative decomposition of the organic substances by the aerobic bacteria introduced and cultured in the aerobic tank 5 is performed. Nitrification reaction to form nitric acid and nitrite is performed by oxidizing bacteria and nitrite oxidizing bacteria.
In FIG. 2, reference numeral 61 indicates a microbial carrier on which nitrifying bacteria are fixed.
A self-priming pump 28 is installed above the oxygen-free tank 4. The other end is connected to the inflow port of the self-priming pump 28, and the other end is anaerobic at the outflow port of the self-priming pump 28. One end of the fourth return pipe 30 located directly above the water surface of the tank 3 is connected. Thus, a series of purification treatments in the anaerobic tank 3, the oxygen-free tank 4, and the aerobic tank 5 can be repeatedly performed, so that the quality of the purification processing can be improved.
The aerobic tank 5 is composed of an upstream aerobic tank 5a and a downstream aerobic tank 5b. The anoxic tank 4 and the aerobic tank 5a on the upstream side are directly connected to each other at the bottom via the communication hole 13. 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 inside the aerobic tank 5b on the downstream side.
Further, in the oxygen-free tank 4 and the aerobic tank 5, far-infrared lamps are devised so as to enhance the activation of microorganisms and the heat insulation effect.

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

As shown in FIG. 8 to FIG. 11A, the sewage and wastewater purification system 53 of the present embodiment includes an in-line accelerated oxidation device (micro bubble generator) 62, and generates micro bubbles in the accelerated oxidation tank 6. It can be generated. Further, according to such a configuration, the fine solid matter that has flowed into and generated in the accelerated oxidation tank 6 is suspended and easily returned to the anaerobic tank 3 by the scum pump 31, so that the removal of the fine solid material from the system is promoted. You can

More specifically, the in-line accelerated oxidizer (micro bubble generator) 62 is installed in the accelerated oxidizer main body 63 and the accelerated oxidization tank 6, and is connected to one end of the accelerated oxidizer main body 63 via the pumping pipe 64. The submersible pump 65 and the discharge pipe 66 connected to the other end of the accelerated oxidation device main body 63 are provided.
The accelerated oxidizer main body 63 includes an injected nano-micro-bubble generating nozzle 67 connected to the pumping pipe 64, and a gas-liquid mixing pipe 68 arranged in order between the nano-micro-bubble generating nozzle 67 and the discharge pipe 66. , A cylindrical ultrasonic jet oscillator 69, and ozone (O ₃ ) gas and hydrogen peroxide solution (H ₂ O ₂ ) can be sent alone or in combination to the nano-micro bubble generating nozzle 67 portion. Is being done.
An electrolysis tank 33 composed of a cylindrical tank is concentrically arranged in the accelerated oxidation tank 6, and TiO2 positive and negative cathode plates 46a and 46b are arranged on the inner peripheral surface of the electrolysis tank 33. The accelerated oxidation tank 6 and the electrolysis tank 33 are directly connected to each other at the bottom via the communication hole 47. The submersible pump 65 of the in-line accelerated oxidizer (micro bubble generator) 62 is installed at the bottom of the electrolysis tank 33, and the discharge pipe 66 is arranged outside the electrolysis tank 33. Further, in FIGS. 8 and 10, reference numeral 70 indicates humus soil in which humic acid which is an organic acid is eluted 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 configuration, it is possible to intentionally generate hydroxyl radicals and improve/promote the oxidizing power. That is, it is possible to decompose and remove persistent pollutants in water by generating OH radicals, which are strong oxidizers, by using ozone, hydrogen peroxide, and ultraviolet (UV) in combination. Become. In particular, it can be expected to exert an excellent effect in decomposing/removing minute pollutants such as dioxins, environmental hormones, and agricultural chemicals. In addition, since ozone, hydrogen peroxide, ultraviolet rays (UV), ultrasonic waves, nano-microbubbles, etc. are used, the main products after decomposition are oxygen and water, so secondary waste is hardly generated. Is obtained. Furthermore, by using ozone, it is possible to bring about effects such as decolorization and deodorization in wastewater, COD reduction, and sterilization at the same time.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, by further combining electrolysis as described above, the oxidative decomposition in the accelerated oxidation tank 6 can be performed more efficiently.

Further, as shown in FIGS. 11, 12, and 13, according to the combination of the concentric cylindrical promoted oxidation tank 6 and the electrolysis tank 33 and the in-line promoted oxidation apparatus 62, the nano/micro bubble generating nozzle 67 and the gas/liquid are used. The spiral flow generated by the mixing pipe 68 and the cylindrical ultrasonic jet oscillator 69 becomes a swirling flow, which promotes the reaction. That is, according to the configuration of the accelerated oxidation tank (swirl type (accelerated flow type) accelerated oxidation tank) 6 of the present embodiment, which includes the cylindrical electrolysis tank 33 and the in-line accelerated oxidation device 62, the conventional accelerated oxidation tank is Compared to the other, because 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 required ozone amount is small, (5) Effects such as low running cost are 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 have a higher dissolution rate than the milli bubbles of about 1 to 10 mm. That is, according to the configuration of the accelerated oxidation tank (swirl flow (vortex) type accelerated oxidation tank) 6 of the present embodiment, which is provided with the cylindrical electrolysis tank 33 and the in-line accelerated oxidation device 62, it is possible to dissolve ozone gas. The dissolution rate can be increased without using a pressure dissolution tank.

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

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

The wastewater that has been purified in the first membrane separation tank 7 is pumped to the ozone contact tank 8 by the self-priming pump 18. Then, the wastewater purified by 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-type nano-micro bubble injector, and the nano-micro bubble injector 51 generates ozone-containing nano-micro bubbles, and the first membrane separation tank 7 The sewage and wastewater that has been purified by the above method can be further purified. Further, reference numeral 72 indicates a TiO ₂ ball which is a photocatalyst, and sterilization can be performed only by irradiating the TiO ₂ ball with ultraviolet rays.

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

Next, as described above, the sewage drainage 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), an NF membrane (nanofiltration membrane), etc. Will be returned to. If the water quality meets the technical standards specified by the Cabinet Order, it will be discharged into rivers. On the other hand, if the water quality does not meet the technical standards specified by the Cabinet Order, it will be used as industrial water without being discharged into rivers. The treated water obtained by the purification treatment by the membrane separation using the RO membrane (reverse osmosis membrane) in the second membrane separation tank 10 is stored in the purified water tank 56 and is used as the purified water (drinking water). ..

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

In the present embodiment, the case where the ozone gas/hydrogen peroxide solution mixed injection type in-line accelerated oxidation device is used has been described as an example, but the invention is not necessarily limited to the accelerated oxidation device having such a configuration. For example, an ozone water/hydrogen peroxide solution separate injection type in-line promoted oxidation device 73 as shown in FIG. 11B may be used.
More specifically, the in-line accelerated oxidizer 73 includes an accelerated oxidizer main body 74, a submersible pump 65 installed in the accelerated oxidizer tank 6 and connected to one end of the accelerated oxidizer main body 74 via a pumping pipe 64. , A discharge pipe 66 connected to the other end of the accelerated oxidation device main body 74.
The accelerated oxidizer main body 74 includes a nano-micro bubble generating nozzle 67 connected to the pumping pipe 64, an injector 75 arranged in order between the nano-micro bubble generating nozzle 67 and the discharge pipe 66, and a cylindrical type. The ultrasonic injection oscillator 69 is provided so that ozone water can be sent to the nano-micro bubble generating nozzle 67 and hydrogen peroxide water can be sent to the injector 75.

Although the present invention has been described above, the usefulness of the present invention will be supplementarily described.
Recently, the following technical issues have become important as regards organic matter treatment.
(1) Eliminate chemicals such as polymer flocculants to reduce the amount of industrial waste processed.
(2) In order to solve the global water resource shortage problem, not only the discharge treatment of sewage and wastewater, but also the decomposition and purification treatment to the extent that it can be reused as industrial water.
(3) Be compact and economical.
(4) Decontamination of livestock manure treatment and removal of trace chemicals and pathogenic microorganisms and purification of persistent substances are possible.

For treating contaminated water, a microbial treatment method has been conventionally used. That is, the microbial treatment method is useful in that the wastewater treatment cost is relatively low. However, the microbial treatment method has a problem that the equipment tends to be enormous and that the hardly decomposable substance cannot be decomposed so that it is not a thorough treatment method. Therefore, in the microbial treatment method, in order to decompose difficult-to-degrade substances that cannot be treated only by microbial treatment into easily degradable substances that are easily biodegradable, it is necessary to develop a new treatment method that can be combined with the biological treatment method. 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 technology for microbial treatment methods that require dissolved oxygen, because secondary waste such as sludge is not generated along with the treatment and ozone becomes harmless oxygen after the reaction. is there.
However, in the ozone treatment method using ozone alone, reducing substances such as nitrite nitrogen and organic substances in the treated water react with ozone and disappear, while there are also substances that have low reactivity with ozone, and are decomposed. However, there is a problem in that some substances are difficult to obtain.

On the other hand, hydroxyl radicals have a wider range of substances that can be decomposed and have higher decomposing power than ozone, and so-called accelerated oxidation method (AOP) utilizing these hydroxyl radicals has been developed.
However, various methods have been tried in order to stably generate the hydroxyl radical, which is the basis of the accelerated oxidation method (AOP), but this has not been reached and the research is still in progress. ..

The present invention overcomes the above-mentioned technical problems in the treatment of organic substances, and develops and puts into practical use a device necessary for stable generation of hydroxyl radicals and their use.

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

1. Anaerobic tank (A) + Anoxic tank (A) + Aerobic tank (O) + (Promoted oxidation tank) + Biological aeration tank (O)
The A2O2 method is a treatment method in which a biological aeration tank is newly installed after accelerated oxidation treatment from the biological treatment method of the A2O method. By positioning the anaerobic tank at the front stage of the solid-liquid separation device, PAO bacteria that have excessively ingested floating slatch and phosphorus are returned to the raw water anaerobic tank. Further, by providing an oxygen-free tank in front of the accelerated oxidation tank to remove biological nitrogen and phosphorus and utilize organic matter as a carbon source required for nitrogen removal, injection of methanol can be omitted. Furthermore, by providing an accelerated oxidation tank and combining it with a biological treatment system, the following advantages and technical characteristics are provided.
(1) Although conventional biological treatments such as the activated sludge method required sedimentation and dehydration treatments after aeration, the sedimentation and dehydration treatments are no longer necessary due to the flotation treatment of slats by nano-micro bubbles in the accelerated oxidation tank.
(2) As the hydrogen peroxide in the accelerated oxidation tank is biologically treated, ozone and hydrogen peroxide eventually become oxygen, and a high oxygen concentration can be maintained in the treated water, so this is treated as a biological treatment (treatment by aerobic bacteria). ) Is available.
(3) It provides a new method of generating hydroxyl radicals, which is ozone + polymer organic acid catalyst. That is, humic acid (Humic Acid) and fulvic acid (Fulvic Acid) are released by suspending humus in the accelerated oxidation tank. Alternatively, liquid humic acid and fulvic acid are directly supplied, and by these, the catalytic action of hydroxyl radical generation is performed.
(4) Since the slats can be floated by utilizing nano-micro bubbles in the accelerated oxidation tank and separated by the scum pump, the precipitation tank and the dehydration process are not required.
(5) Development of integrated in-line accelerated oxidation equipment optimized for accelerated oxidation tank.
(6) Development of a gas-liquid injection method integrated with the injector.
(7) As a structural feature of the accelerated oxidation tank, it has a cylindrical shape and creates a swirling flow.
(8) Efficient dissolution is possible with the nano-micro bubble generation nozzle, so the conventional high-pressure tank for increasing the ozone dissolution rate is not required.

Further, according to the present invention, it is possible to make the system compact and improve the purifying ability, and have the following advantages and technical features.
(1) Compact size such as aeration tank capacity, aeration time, and omission of piping.
(2) No secondary waste such as purification by-products and sediments.
(3) Reduction of industrial waste and elimination of global water resource shortage.
(4) Ideal for industrial water because it removes chemicals such as polymer flocculants (for bulking elimination, defoaming agents, etc.) and leaves no chemical components in the final treated water.
(5) The quality of organic fertilizer is improved by the solid matter after solid-liquid separation of livestock manure.
(6) Flocculant When necessary, develop and use flocculating biopolymer (microbial flocculant).

1,53 Wastewater purification system 3 Anaerobic tank 4 Oxygen-free tank 5 Aerobic tank 6 Accelerated 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 (11)

An anaerobic tank for purifying sewage discharged from a sewage generation source with anaerobic bacteria,
An oxygen-free tank for purifying the wastewater purified by the anaerobic tank with denitrifying bacteria,
An aerobic tank for purifying dirty wastewater purified by the anoxic tank with aerobic bacteria;
An accelerated oxidation tank for purifying the wastewater purified by the aerobic tank by oxidative decomposition;
Equipped with
A wastewater purification system in which each of these tanks is placed in proximity to any one or more of the other tanks, and the water level in each tank is kept the same,
An intermittent submersible pump is installed in the anaerobic tank,
One end of a first transfer pipe, the other end of which is connected to the inlet of the solid-liquid separator, is connected to the submersible pump,
The solid-liquid separator has an outlet connected to one end of a second transfer pipe, the other end of which is located in the oxygen-free tank.
A scum pump is floated in the accelerated oxidation tank, and one end of a return pipe whose other end is located in the anaerobic tank is connected to the scum pump,
further,
A first membrane separation tank for purifying the wastewater purified by the accelerated oxidation tank by membrane separation;
An ozone contact tank for purifying the wastewater purified by the first membrane separation tank with ozone,
A biological activated carbon tank for purifying the wastewater purified by the ozone contact tank with biological activated carbon;
A sewage and wastewater purification system comprising: An anaerobic tank for purifying sewage discharged from a sewage generation source with anaerobic bacteria,
An oxygen-free tank for purifying the wastewater purified by the anaerobic tank with denitrifying bacteria,
An aerobic tank for purifying dirty wastewater purified by the anoxic tank with aerobic bacteria;
An accelerated oxidation tank for purifying the wastewater purified by the aerobic tank by oxidative decomposition;
Equipped with
A wastewater purification system in which each of these tanks is placed in proximity to any one or more of the other tanks, and the water level in each tank is kept the same,
An intermittent submersible pump is installed in the anaerobic tank,
One end of a first transfer pipe, the other end of which is connected to the inlet of the solid-liquid separator, is connected to the submersible pump,
The solid-liquid separator has an outlet connected to one end of a second transfer pipe, the other end of which is located in the oxygen-free tank.
A scum pump is floated in the accelerated oxidation tank, and one end of a return pipe whose other end is located in the anaerobic tank is connected to the scum pump,
further,
A biological aeration tank for purifying the wastewater purified by the accelerated oxidation tank by biological treatment;
A first membrane separation tank for purifying the wastewater purified by the biological aeration tank by membrane separation;
An ozone contact tank for purifying the wastewater purified by the first membrane separation tank with ozone,
A biological activated carbon tank for purifying the wastewater purified by the ozone contact tank with biological activated carbon ;
A sewage and wastewater purification system comprising: The oxidative decomposition in the accelerated oxidation tank is performed by any one or combination of ozone supply, hydrogen peroxide supply, high molecular weight organic acid supply, UV irradiation, and ultrasonic spraying. Sewage purification system. The wastewater purification system according to claim 3 , wherein the polymer organic acid contains at least one or more of fulvic acid and humic acid. The wastewater purification system according to claim 3 or 4 , wherein the oxidative decomposition in the accelerated oxidation tank is performed by further combining electrolysis. The wastewater purification system according to claim 5 , wherein the accelerated oxidation tank is provided with an electrolysis tank at the center thereof. The wastewater purification system according to any one of claims 1 to 6, further comprising a microbubble generator, wherein the solid matter is suspended by generating microbubbles at the bottom of the accelerated oxidation tank. The wastewater purification system according to claim 6 or 7 , wherein the accelerated oxidation tank and the electrolysis tank are formed in a concentric cylindrical shape. The wastewater purification system according to claim 1 , further comprising a second membrane separation tank that purifies the wastewater purified by the biological activated carbon tank by membrane separation. A treated water tank that stores the wastewater purified by the biological activated carbon tank,
The wastewater purification system according to claim 2, 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. Membranes used in the first membrane separation tank or the second membrane separation tank are 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 10, which is selected from any one or a plurality of the above.