JP6750930B6 - Sewage purification system - Google Patents

Description

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

Decomposing and processing organic matter such as feces (hereinafter simply referred to as "organic matter") is extremely important.
In other words, if organic matter is left unattended, it becomes environmentally unsanitary, and it is necessary to treat it appropriately. As a treatment of organic matter, it can be considered as a method of flushing it into sewage, but it cannot be flushed into sewage in an environment where sewage facilities are not equipped. For this reason, in such an environment, it becomes necessary to decompose and process organic matter on the spot.
However, in an environment where sewage facilities are not well-equipped, other facilities such as electricity and water supply are not well-equipped, and the energy and water supply required for treatment is often insufficient. For this reason, it is preferable that the method for disassembling and processing is a self-contained method as much as possible. For example, Patent Document 1 discloses a technique relating to such a self-contained sewage purification system.

Japanese Unexamined Patent Publication No. 2015-127039

The technique disclosed in Patent Document 1 (prior art) is a technique developed by the inventor of the present application, and is a useful technique in that the system can be made compact and an economical water-free circulating toilet device can be realized. Is.
However, there were still issues with 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 there is a relatively large distance between the tanks, the positional relationship between the tanks will be distorted due to shaking and vibration during transportation and daily use. As a result, the pipes arranged through the gap may be misaligned, or the joint between the pipe and the tank may be cracked, leading to failure. As described above, the prior art has a problem that the entire system has poor durability and maintainability.

Against the background of the above circumstances, it is an object of the present invention to develop a self-contained sewage purification system by evolving the technique of Patent Document 1, further improving durability and maintainability, and further improving the resolution. ..

As a result of diligent research, the inventor came up with a sewage purification system in which the tanks for purification treatment were placed close to each other to shorten the length of the pipes as much as possible, and the accelerated oxidation tank was provided to further improve the resolution. However, the invention was completed.

That is, in the sewage purification system of the present invention, by arranging the tanks close to each other, it is possible to almost eliminate the displacement of the positions 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 the piping is extremely unlikely to be displaced or distorted.
In addition, the sewage purification system of the present invention is configured to decompose organic matter by oxidation in the accelerated oxidation tank, float the solid matter that has flowed in and generated in the tank, and return it by a scum pump. It 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 sewage supplied from a sewage source with anaerobic bacteria,
An oxygen-free tank that purifies the sewage that has been purified in the anaerobic tank with denitrifying bacteria, and
An aerobic tank that purifies the sewage that has been purified in the oxygen-free tank with nitrifying bacteria, and
An accelerated oxide tank that purifies the sewage purified in the aerobic tank by oxidative decomposition.
With
A sewage purification system in which each of these tanks is placed close to one or more of the other tanks and the water level in each tank is kept the same.
A submersible pump that starts intermittently is installed in the anaerobic tank.
One end of the first transfer pipe whose other end is connected to the inflow port of the solid-liquid separator is connected to the submersible pump.
One end of a second transfer pipe whose other end is located in the oxygen-free tank is connected to the outlet of the solid-liquid separator.
A scum pump is floated in the accelerated oxidation tank.
The scum pump is a sewage purification system characterized in that the other end is connected to one end of a return pipe located in the anaerobic tank.

The second configuration of the present invention is that the oxidative decomposition in the accelerated oxidation tank is a combination of hydrogen peroxide supply, high molecular weight organic acid (high electron density organic acid) supply, ozone supply, or a combination of two or more. The sewage purification system according to the first configuration, characterized in that it is carried out.
The third configuration of the present invention is the stain according to the second configuration, wherein the high molecular weight organic acid contains at least one or more of fulvic acid and humic acid. It is a wastewater purification system.
The fourth configuration of the present invention is the sewage purification system according to the second or third configuration, wherein the oxidative decomposition in the accelerated oxidation tank is further performed by combining electrolysis.
The fifth configuration of the present invention is the sewage purification system according to the fourth configuration, wherein the accelerated oxidation tank is provided with an electrolysis tank at the center thereof.
The sixth configuration of the present invention further comprises a microbubble generator, and the first to fifth configurations are characterized in that solid matter is suspended by generating microbubbles at the bottom of the accelerated oxidation tank. The sewage purification system described.
The seventh configuration of the present invention is the sewage 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
The first membrane separation tank that purifies the sewage purified in the accelerated oxidation tank by membrane separation, and
An ozone contact tank that purifies the sewage purified in the first membrane separation tank with ozone, and
The sewage purification system according to the first to seventh configurations, further comprising a biologically activated carbon tank that purifies the sewage purified by the ozone contact tank with biologically activated carbon.
The sewage according to the eighth configuration, wherein the ninth configuration of the present invention further includes a second membrane separation tank for purifying the sewage purified in the bioactivated carbon tank by membrane separation. It is a purification system.
The tenth configuration of the present invention is a biological aeration tank that purifies the sewage purified in the accelerated oxidation tank by biological treatment, and a biological aeration tank that purifies the sewage purified in the biological aeration tank by membrane separation. A first membrane separation tank, an ozone contact tank that purifies the sewage purified in the first membrane separation tank with ozone, and an organism that purifies the sewage purified in the ozone contact tank with bioactive charcoal. The sewage purification system according to the first to seventh configurations, which further comprises an activated coal tank.
The eleventh configuration of the present invention is the eleventh configuration in which a treated water tank for storing sewage purified in a bioactivated carbon tank and the treated water stored in the treated water tank are transferred and the treated water is purified by membrane separation. The sewage purification system according to the tenth configuration, which further comprises a two membrane separation tank.
In the twelfth configuration of the present invention, the membranes used in the first membrane separation tank or the second membrane separation tank are MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), and NF membrane (nanofiltration). The sewage purification system according to the ninth or eleventh configuration, which is selected from one or a plurality of membranes) or RO membranes (reverse osmosis membranes).

INDUSTRIAL APPLICABILITY According to the present invention, it has become possible to provide a self-contained sewage purification system with improved resolution as well as improved durability and maintainability by evolving the technique of Patent Document 1.

Conceptual diagram showing the configuration and flow of the sewage purification system according to the first embodiment of the present invention. Elevation view showing the overall configuration of the sewage purification system according to the first embodiment of the present invention. A plan view showing the overall configuration of the sewage purification system according to the first embodiment of the present invention. The figure which shows the accelerated oxidation tank which constitutes the sewage purification system in Embodiment 1 of this invention ((a) is an elevation view, (b) is a plan view) Elevation view showing an accelerated oxidation circulation device (micro bubble generator) constituting the sewage purification system according to the first embodiment of the present invention. Conceptual diagram showing another configuration and flow of the sewage purification system according to the first embodiment of the present invention. Conceptual diagram showing the configuration and flow of the sewage purification system according to the second embodiment of the present invention. Elevation view showing the overall configuration of the sewage purification system according to the second embodiment of the present invention. A plan view showing the overall configuration of the sewage purification system according to the second embodiment of the present invention. The figure which shows the accelerated oxidation tank which constitutes the sewage purification system in Embodiment 2 of this invention ((a) is an elevation view, (b) is a plan view). An elevational view showing an accelerated oxidation circulation device (microbubble generator) constituting the sewage purification system according to the second embodiment of the present invention ((a) is a mixed injection type of ozone gas and hydrogen peroxide solution, and (b) is ozone. Water and hydrogen peroxide solution separate injection type) The figure for demonstrating the effect caused by the structure of the accelerated oxidation tank which constitutes the sewage purification system in Embodiment 2 of this invention (the 1). FIG. 2 for explaining the effect caused by the structure of the accelerated oxidation tank constituting the sewage purification system according to the second embodiment of the present invention (No. 2). Elevation showing the overall configuration of the sewage purification system in the prior art

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, the following embodiments are merely examples that embody the present invention, and the present invention is not limited thereto.

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

That is, in the sewage purification system of the present invention, by arranging the tanks close to each other, it is possible to almost eliminate the displacement of the positions between the tanks and to shorten the length of the pipe as much as possible. It is a thing.
With these configurations, the sewage purification system of the present invention has a structure in which the piping is extremely unlikely to be displaced or distorted.
In the present invention, "proximity arrangement" means that the tanks are in contact with each other, or that the displacement between the tanks during movement or daily use is so close that it does not lead to a failure. Defined.

In addition, the accelerated oxidation tank decomposes organic matter by oxidation, floats the solid matter that has flowed into and generated in the tank, and returns it to the anaerobic tank by a scum pump. Decomposition by oxidation and floating separation of solid matter Is possible.

The sewage 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 sewage purification system, mainly responsible for the decomposition of sewage and the removal of solids from the system.
The sewage purification system of the present invention may be provided with other components. Examples of such an arbitrary component 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 providing these components, the sewage that has been purified up to the accelerated oxidation tank can be further purified and purified to the extent that it can clear legal regulations or can be used as drinking water or washing water. Therefore, it is possible to obtain the effect that the usefulness of the sewage purification system of the present invention can be improved.

Each of the essential and optional components of the present invention is placed in close proximity to one or more other tanks. In addition, each tank is directly connected at the top or bottom of the tank, or a transfer pipe or a return pipe is arranged as appropriate, which enables the movement of treated water between the tanks. Furthermore, the water level in each tank is kept the same. And, 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 sewage purification system with the minimum energy for movement. Be done.
In the present invention, "holding the same water level" may be the same as long as the treated water can move due to gravity, and in this sense, it does not necessarily have 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 illustrated in FIG. 6, it can be used for various purposes related to the decomposition of organic matter, such as manure treatment in a livestock barn or a simple toilet, manure treatment in a simple house, and domestic wastewater treatment.

Hereinafter, the configuration of each tank in the sewage purification system of the present invention will be described.
[Aerobic tank]
The anaerobic tank functions to purify the sewage supplied from the sewage source with anaerobic bacteria. In addition, the anaerobic tank is connected to a solid-liquid separator, and by supplying raw water or treated water to this, it functions to assist the 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 has anaerobic bacteria inside, and is solid-liquid by a submersible pump and a transfer pipe connected to the submersible pump. The configuration may be connected to the separator.

[Oxygen tank]
The oxygen-free tank has the function of purifying the nitrogen component in the sewage supplied from the anaerobic tank by denitrifying bacteria. The oxygen-free 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 oxygen-free tank may typically have a cylindrical shape and may be configured to have denitrifying bacteria inside.

[Aerobic tank]
The aerobic tank functions to purify organic matter by aerobic bacteria from the sewage supplied from the anoxic tank. 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 bacterium (PAO), nitrifying bacterium described later, and the like can be used.
As shown in FIGS. 2 and 3, the aerobic tank may typically have a cylindrical shape and may have an aerobic bacterium inside.

[Promoted oxidation tank]
The accelerated oxide tank has the function of purifying the sewage supplied from the aerobic tank by oxidative decomposition and the function of returning the solid matter flowing into and generated in the tank to the anaerobic tank by a scum pump. The accelerated oxide tank is not particularly limited as long as it fulfills 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 carried out, so it is preferable to use a material having high resistance to radical reactions, for example. , It is preferable to use 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, supply of ozone (O ₃ ), supply of hydrogen peroxide (H ₂ O ₂ ), supply of high molecular weight organic acid (high electron density organic acid), UV irradiation, ultrasonic equipment, etc. Can be used alone or in combination of two or more. As a result, the effect that accelerated oxidation can be effectively performed can be obtained.
The high molecular weight 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, and various high molecular weight organic acids. Can be used. As such a high molecular weight organic acid, fulvic acid and humic acid can be typically used, and it is preferable that at least one or more of these is contained.
As exemplified by the following formula, the high molecular weight organic acid can generate radicals such as hydroxyl radical through an electron transfer reaction with ozone to promote the oxidation reaction in the accelerated oxidation tank.

(Equation 1) O ₃ + high electron density organic acid → O ₃・ Organic acid (ozone adduct organic acid)
(Equation 2) O ₃ · organic acid (ozone adduct organic acid) → O ₃ ^- + organic acid ⁺
(Equation ^{_{3) O 3 - + H +}} → HO 3 → OH + O 2

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

In the present invention, it is preferable to further include a microbubble generator 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 easily 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 of being able to do 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 those having various performances can be adopted and installed at various positions. be able to. The microbubble generator can typically be installed above the accelerated oxidation tank, as shown in FIGS. 2 and 4.

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

Through these series of accelerated oxidation, hydroxyl radicals can be intentionally generated to improve and promote the oxidizing power.
That is, by using ozone, hydrogen peroxide, and ultraviolet rays (UV) as shown in FIG. 5 in combination, hydroxyl radical, which is a strong oxidizing agent, is generated to decompose persistent pollutants in water. It can be removed. In particular, it can be expected to exert an excellent effect on the decomposition and removal of fine pollutants such as dioxins, environmental hormones, and pesticides.
Further, since the main products after decomposition by ozone, hydrogen peroxide, UV, etc. are oxygen and water, the effect that secondary waste is hardly generated can be obtained.
In addition, by using hydroxyl radicals generated in the accelerated oxidation tank, it is possible to simultaneously bring about effects such as decolorization, deodorization, COD reduction, and sterilization in sewage.

[First membrane separation tank]
The first membrane separation tank functions to purify the sewage 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 those having various configurations can be adopted.
Further, the first membrane separation tank has the property of so-called coarse separation as compared with the second membrane separation tank described later, and the membrane used in the first membrane separation tank or the second membrane separation tank is An MF membrane (microfiltration membrane), a UF membrane (ultrafiltration membrane), an NF membrane (nanofiltration membrane) or an RO membrane (reverse osmosis membrane) may be used in an appropriate combination. In the first membrane separation tank, a UF membrane may typically be used.

[Ozone contact tank]
The ozone contact tank functions to purify the sewage 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 those having various configurations can be adopted.

[Bioactivated carbon tank]
The bioactivated carbon tank has the function of purifying the sewage supplied from the ozone contact tank with the bioactivated 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 sewage supplied from the bioactivated carbon tank by membrane separation. The second membrane separation tank is not particularly limited as long as it fulfills such a function, and those having 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 sewage purification system according to the first embodiment 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 the sewage purification system according to the first embodiment of the present invention, FIG. 2 is an elevation view showing the overall configuration of the sewage purification system, and FIG. 3 is the sewage purification system of the sewage purification system. A plan view showing the overall configuration, FIG. 4 is a view showing an accelerated oxide tank constituting the sewage purification system ((a) is an elevation view, (b) is a plan view), and FIG. 5 is a sewage purification system. It is an elevation view which shows the accelerated oxidation circulation apparatus (micro bubble generator) which constitutes.

As shown in FIGS. 1 to 3, the sewage purification system 1 of the present embodiment is arranged in order from the upstream side (sewage source side) and is supplied from the sewage source (raw water). Purification treatment in the raw water collection tank 2 (not shown in FIGS. 2 and 3), the anaerobic tank 3 in which the sewage purified in the raw water collection tank 2 is purified by anaerobic bacteria, and the anaerobic tank 3 Anoxic tank 4 that purifies the sewage that has been purified by denitrifying bacteria, aerobic tank 5 that purifies the sewage that has been purified in the anoxic tank 4 with aerobic bacteria, and aerobic tank 5. The accelerated oxide tank 6 purifies the wastewater by oxidative decomposition, the first film separation tank 7 that purifies the sewage purified in the accelerated oxide tank 6 by film separation, and the first film separation tank 7. The ozone contact tank 8 that purifies the treated sewage with ozone, the bioactive coal tank 9 that purifies the sewage that has been purified in the ozone contact tank 8 with bioactive charcoal, and the bioactive coal tank 9 that purifies the treated sewage. A second film separation tank 10 (not shown in FIGS. 2 and 3) that purifies sewage by membrane separation and a treated water storage tank that stores the treated water obtained by purification treatment in the second film separation tank 10. 11 (not shown in FIG. 2) and.
The raw water collection 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 arranged vertically.
Further, 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 square cylinder tank, which is also vertically placed.
The materials of these cylindrical tanks and square cylinder tanks need not be particularly limited, and those made of PVC (polyvinyl chloride) may be typically 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 reactions and the like, and typically, a stainless steel material or the like may be used.

Each of these tanks is located in close proximity to one or more of the other tanks. The anaerobic tank 3 and the oxygen-free tank 4, and the oxygen-free tank 4 and the aerobic tank 5 are directly connected to each other at the bottom via communication holes 12 and 13, respectively. In addition, aerobic tank 5 and accelerated oxide tank 6, accelerated oxide tank 6 and first membrane separation tank 7, ozone contact tank 8 and bioactivated carbon tank 9, bioactivated carbon tank 9 and second membrane separation tank 10, and second membrane separation tank 5. 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, respectively. Here, the communication pipes 14, 15, 16 and the like are provided at positions 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, the treated water can be moved by the principle of natural flow according to gravity, and it can function as a self-contained sewage 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 displacement of the positions between the tanks and to shorten the length of the pipe as much as possible. With such a configuration, it is possible to realize a sewage purification system in which piping deviation and distortion are extremely unlikely to occur.

In the sewage purification system 1 of the present embodiment, when a certain amount of sewage (raw water) is accumulated in the raw water collection tank 2, the sewage pump (not shown) is automatically started and the sewage in the raw water collection tank 2 is discharged. Is configured to be pumped to the anaerobic tank 3 via the transfer pipe 17. The sewage pumped into the anaerobic tank 3 is discharged in the order of anoxic tank 4, aerobic tank 5, accelerated oxidation tank 6, and first membrane separation tank 7 through communication holes 12, 13 and communication pipes 14, 15. Moving. In this way, when the water level of the sewage in the raw water collection tank 2 rises, the sewage 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 a flow control tank is not provided separately, no problem will occur in the flow of sewage. As a result, the sewage purification system can be made compact.
Further, the sewage 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. Then, the sewage pumped up to the ozone contact tank 8 moves in the order of the biological activated carbon tank 9, the second membrane separation tank 10, and the treated water storage tank 11 via the communication pipe 16 and the like. In this way, the sewage 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 No problem will occur in the flow of sewage even if it is not provided separately. As a result, the sewage purification system can be made compact.
In this case, the case where the sewage 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, but such a configuration is not always applicable. It is not limited. For example, a communication hole (not shown) for moving the sewage after the first membrane separation treatment to the ozone contact tank 8 according to gravity may be provided at the bottom.

The raw water collection tank 2 has a screen function for removing contaminant solids from the sewage (raw water) supplied from the sewage source. After the contaminants are removed, the sewage is purified by undergoing anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria, etc. in the anaerobic tank 3, anoxic tank 4, and aerobic tank 5. Will be done.

Anaerobic bacteria are charged into the anaerobic tank 3. Then, the sewage pumped 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 and purified.
Further, a submersible pump 19 that starts intermittently is installed in the anaerobic tank 3. Then, one end of the first transfer pipe 21 whose other end is connected to the inflow port of the solid-liquid separator (decanter) 20 is connected to the submersible pump 19, and the other end is connected to the outlet of the solid-liquid separator 20. 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 sewage pumped into the anaerobic tank 3 can be discharged from the discharge port of the solid-liquid separator 20 and removed.
In FIG. 2, reference numeral 23 indicates a stirring pump that agitates the inside of the anaerobic tank 3 in order to promote the anaerobic decomposition treatment of organic matter 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 sewage purified in the anaerobic tank 3 is moved to the oxygen-free tank 4 via the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed above the oxygen-free tank 4. Then, one end of the first return pipe 25 whose other end is located in the aerobic tank 5 at the subsequent stage is connected to the inflow port of the self-priming pump 24, and the other end is connected to the outflow port of the self-priming pump 24. Is connected to one end of the second return pipe 26 located on the water surface of the oxygen-free tank 4. As a result, nitrifying nitrogen was nitrified by the nitrifying bacteria grown in the aerobic tank 5 to return nitrate nitrogen and nitrite nitrogen to the oxygen-free tank 4, and they were grown in the oxygen-free tank. Contact with denitrifying bacteria in anoxic condition. Then, the denitrifying bacteria denitrify the organic matter component in the sewage using the hydrogen donor as a hydrogen donor, so that the nitrate nitrogen in the sewage is changed to nitrogen gas and removed.
In FIG. 2, reference numeral 27 indicates a stirring pump that agitates the inside of the oxygen-free tank 4 in order to accelerate the nitrogen removal treatment in the oxygen-free tank 4.

The sewage purified in the oxygen-free tank 4 is moved to the aerobic tank 5 through the communication hole 13. Nitrifying bacteria, which are aerobic bacteria, are charged into the aerobic tank 5. Then, the sewage purified in the anoxic tank 4 is aerated in the aerobic tank 5, and the organic matter is oxidatively decomposed by the aerobic bacteria charged and cultured in the aerobic tank 5, and ammonia is ammonia. Oxidizing bacteria and nitrite Oxidizing bacteria carry out a nitrification reaction to nitric acid and nitrite.
A self-priming pump 28 is installed above the oxygen-free tank 4. One end of the 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 the fourth return pipe 30 located directly above the water surface of the tank 3 is connected. As a result, 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 treatment can be improved.
The aerobic tank 5 is composed of an aerobic tank 5a on the upstream side and an aerobic tank 5b on the downstream side. Then, the oxygen-free tank 4 and the aerobic tank 5a on the upstream side 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 aerobic tank 5a on the upstream side. The other end of the third return pipe 29 is located in the aerobic tank 5b on the downstream side.
Further, the anaerobic tank 3, the oxygen-free tank 4, and the aerobic tank 5 are devised so as to enhance the activation of microorganisms and the heat-retaining and heat-insulating effect through far infrared rays.

The sewage purified in the aerobic tank 5 is moved to the accelerated oxidation tank 6 via the communication pipe 14. Then, the sewage purified in 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 is a 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 is returned to the anaerobic tank 3 and discharged from the discharge port of the solid-liquid separator 20 so that it can be removed.

As shown in FIGS. 2 to 5, the sewage purification system 1 of the present embodiment includes the accelerated oxidation circulation device (microbubble generator) 34, and generates microbubbles at the bottom of the accelerated oxidation tank 6. It is designed to be able to. According to this configuration, the fine solids that have flowed in and generated in the accelerated oxidation tank 6 are suspended 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 (micro bubble generator) 34 is installed in the accelerated oxidation circulation device main body 35 and the accelerated oxidation tank 6, and one end of the accelerated oxidation circulation device main body 35 via the pumping pipe 36. It is provided with a submersible pump 37 connected to the above, and a discharge tube 38 connected to the other end of the accelerated oxidation circulation device main body 35 and having a microbubble discharge portion 38a at the tip arranged at the bottom of the accelerated oxidation tank 6. ..
The main body 35 of the accelerated oxidation circulation device includes a UV lamp 40 and a TiO ₂ ball 41 arranged in order between the fine bubble generating nozzle 39 connected to the pumping pipe 36 and the fine bubble generating nozzle 39 and the discharge pipe 38. It is equipped with an enclosed quartz tube 42 and a gas-liquid mixing tube 43, and hydrogen peroxide (H ₂ O ₂ ), high molecular weight organic acid (fulvic acid, humic acid, etc.), ozone are provided in the fine bubble generation nozzle 39. (O ₃₎ is to be able to a feeding singly or a plurality.
In the accelerated oxidation tank 6, electrolysis tanks 33 made of a cylindrical tank made of PVC (polyvinyl chloride) are 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 a 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.

The accelerated oxidation tank 6 having the above configuration can intentionally generate OH radicals to improve and promote the oxidizing power. In other words, by using ozone, hydrogen peroxide, and even ultraviolet rays (UV) in combination, it is possible to generate hydroxyl radicals, which are powerful oxidizing agents, and decompose and remove persistent pollutants in water. Become. In particular, it can be expected to exert an excellent effect on the decomposition and removal of fine pollutants such as dioxins, environmental hormones, and pesticides. In addition, the combination of ozone, hydrogen peroxide, and high molecular weight organic acid has the effect of generating almost no secondary waste because the main products after decomposition are oxygen and water. Furthermore, by using ozone or the like, it is possible to simultaneously bring about effects such as decolorization, deodorization, COD reduction, and sterilization in sewage.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, by further combining the 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 purified in the accelerated oxidation tank 6 is moved to the first membrane separation tank 7 via the communication pipe 15. Then, the sewage purified in the accelerated oxidation tank 6 is purified by membrane separation in the first membrane separation tank 7.
The first membrane separation tank 7 has properties as so-called coarse separation as compared with the second membrane separation tank 10 described later, and a UF membrane (ultrafiltration membrane) 49 is used as the membrane (membrane). Has been done.
In FIG. 2, reference numeral 50 indicates an air diffuser, and the air diffuser 50 functions to supply oxygen to activated sludge and clean the membrane surface by an ascending flow of bubbles.
The solid matter captured in the first membrane separation tank 7 and the peeled biofilm are transferred to the anaerobic tank 3 as backwash water.

The sewage 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 sewage 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 submersible pump type nano-micro bubble inject, and the nano-micro bubble inject 51 generates nano-micro bubbles containing ozone to generate a first membrane separation tank 7 It is possible to further purify the sewage that has been purified in.

The sewage purified in the ozone contact tank 8 is moved to the bioactivated carbon tank 9 via the communication pipe 16. Then, the sewage purified in 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 sewage purified in the bioactivated carbon tank 9 is moved to the second membrane separation tank 10. Then, the sewage purified in the bioactivated carbon tank 9 is purified by membrane separation in the second membrane separation tank 10.
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 obtained 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 into a river or the like as long as the water quality conforms to the technical standards specified by Cabinet Order. In addition, it may be treated on the premises without being discharged into a river or the like (reuse).

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

[Embodiment 2]
Next, the configuration of the sewage purification system according to 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 sewage purification system according to the second embodiment of the present invention, FIG. 8 is an elevation view showing the overall configuration of the sewage purification system, and FIG. 9 is the sewage purification system of the sewage purification system. A plan view showing the overall configuration, FIG. 10 is a view showing an accelerated oxide tank constituting the sewage purification system ((a) is an elevation view, (b) is a plan view), and FIG. 11 is a sewage purification system. Elevation view showing the accelerated oxidation device (micro bubble generator) to be 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. 12 and FIG. 13 is a diagram for explaining the effect caused by the structure of the accelerated oxide tank constituting the sewage purification system.

As shown in FIGS. 7 to 9, the sewage purification system 53 of the present embodiment is arranged in order from the upstream side (sewage source side) and is supplied from the sewage source (raw water). The raw water collection tank 2 (not shown in FIG. 8) that purifies the wastewater, the anaerobic tank 3 that purifies the sewage purified in the raw water collection tank 2 with anaerobic bacteria, and the sewage that has been purified in the anaerobic tank 3. Anoxic tank 4 that purifies wastewater with denitrifying bacteria, aerobic tank 5 that purifies sewage purified in anoxic tank 4 with aerobic bacteria, and sewage that has been purified in aerobic tank 5. The accelerated oxide tank 6 that purifies the wastewater by oxidative decomposition, the biological aeration tank 54 that purifies the sewage purified in the accelerated oxide tank 6 by biological treatment, and the sewage that has been purified in the biological aeration tank 54 is coated with a film. The first film separation tank 7 that is purified by separation, the ozone contact tank 8 that purifies the sewage that has been purified in the first film separation tank 7 with ozone, and the sewage that has been purified in the ozone contact tank 8 It is provided with a bioactive charcoal tank 9 for purification treatment with bioactive charcoal.
The sewage purified in the bioactivated carbon tank 9 is stored in the 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) by 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 conforms to 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. Further, the treated water obtained by purification treatment by membrane separation using an 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 The 10 and the purified water tank 56 are each composed of a square cylinder tank, and these are arranged vertically.
Further, 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 square cylinder tanks is not particularly limited, but typically those made of 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 reactions and the like, and typically, a stainless steel material or the like may be used.

Each of these tanks is located in close proximity to one or more of the other 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 at the bottom through communication holes 12, 13, and 57, respectively. 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, treatment 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 upper part, respectively. Here, the communication pipes 14, 15, 16 and the like are provided at positions 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, the treated water can be moved according to gravity, and it can function as a self-contained sewage 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 displacement of the positions between the tanks and to shorten the length of the pipe as much as possible. With such a configuration, it is possible to realize a sewage purification system in which piping deviation and distortion are extremely unlikely to occur.

In the sewage purification system 53 of the present embodiment, when a certain amount of sewage (raw water) is accumulated in the raw water collection tank 2, the sewage pump (not shown) is automatically started and the sewage in the raw water collection tank 2 is discharged. Is configured to be pumped to the anaerobic tank 3 via the transfer pipe 17. Then, the sewage pumped up to 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 is anoxic tank 4, aerobic tank 5, accelerated oxidation tank 6, biological aeration. The tank 54 and the first membrane separation tank 7 move in this order. In this way, when the water level of the 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, and so on. Since the single membrane separation tank 7 is moved in this order, no problem occurs in the flow of sewage even if a flow rate adjusting tank is not separately provided. As a result, the sewage purification system can be made compact.
Further, the sewage 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. Then, the sewage pumped up to the ozone contact tank 8 moves in the order of the biological activated carbon tank 9, the treated water tank 55, the second membrane separation tank 10, and the refined water tank 56 via the communication pipe 16 and the like. In this way, the sewage 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 purification water tank 56. Even if a separate regulating tank is not provided, no problem will occur in the flow of sewage. As a result, the sewage purification system can be made compact.
In this case, the case where the sewage 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, but such a configuration is not always applicable. It is not limited. For example, a communication hole (not shown) for moving the sewage after the first membrane separation treatment to the ozone contact tank 8 according to gravity may be provided at the bottom.

The raw water collection tank 2 is provided with a drum screen (not shown) and functions to remove contaminant solids from the sewage (raw water) supplied from the sewage source. After the contaminants are removed, the sewage is purified by undergoing anaerobic decomposition by anaerobic bacteria, aerobic decomposition by aerobic bacteria, etc. in the anaerobic tank 3, anoxic tank 4, and aerobic tank 5. Will be done.

Anaerobic bacteria are charged into the anaerobic tank 3. In FIG. 8, reference numeral 58 indicates a microbial carrier on which anaerobic bacteria are immobilized. Then, the sewage pumped 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 and purified.
Further, a submersible pump 19 that starts intermittently is installed in the anaerobic tank 3. Then, one end of the first transfer pipe 21 whose other end is connected to the inflow port of the solid-liquid separator 20 is connected to the submersible pump 19, and the other end is absent at the outlet of the solid-liquid separator 20. 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 sewage pumped into the anaerobic tank 3 can be discharged from the discharge port of the solid-liquid separator 20 and removed.

The sewage purified in the anaerobic tank 3 is moved to the oxygen-free tank 4 via the solid-liquid separator 20 and the communication hole 12.
A self-priming pump 24 is installed above the oxygen-free tank 4. Then, one end of the first return pipe 25 whose other end is located in the aerobic tank 5 at the subsequent stage is connected to the inflow port of the self-priming pump 24, and the other end is connected to the outflow port of the self-priming pump 24. Is connected to one end of the 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 oxygen-free tank 4, and the sewage purified in the anaerobic tank 3 and the denitrifying bacteria come into contact with each other in an oxygen-free state. Then, the sewage purified in the anaerobic tank 3 is denitrified by the denitrifying bacteria growing in the anoxic tank using the organic component in the sewage as a hydrogen donor, so that the nitrate nitrogen in the sewage is removed. It changes to nitrogen gas and is removed.
In FIG. 2, reference numeral 59 indicates a microbial carrier on which nitrifying bacteria are immobilized. Reference numeral 60 indicates a downward-type stirring pump that agitates the inside of the oxygen-free tank 4 in order to make the concentration of activated sludge in the oxygen-free tank 4 uniform.

The sewage purified in the oxygen-free tank 4 is moved to the aerobic tank 5 through the communication hole 13. Nitrifying bacteria, which are aerobic bacteria, are charged into the aerobic tank 5. Then, the sewage purified in the anoxic tank 4 is aerated in the aerobic tank 5, and the organic matter is oxidatively decomposed by the aerobic bacteria charged and cultured in the aerobic tank 5, and ammonia is ammonia. Oxidizing bacteria and nitrite Oxidizing bacteria carry out a nitrification reaction to nitric acid and nitrite.
In FIG. 2, reference numeral 61 indicates a microbial carrier on which nitrifying bacteria are immobilized.
A self-priming pump 28 is installed above the oxygen-free tank 4. One end of the 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 the fourth return pipe 30 located directly above the water surface of the tank 3 is connected. As a result, 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 treatment can be improved.
The aerobic tank 5 is composed of an aerobic tank 5a on the upstream side and an aerobic tank 5b on the downstream side. Then, the oxygen-free tank 4 and the aerobic tank 5a on the upstream side 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 aerobic tank 5a on the upstream side. The other end of the third return pipe 29 is located in the aerobic tank 5b on the downstream side.
Further, in the oxygen-free tank 4 and the aerobic tank 5, the far-infrared lamp is devised so as to enhance the activation of microorganisms and the heat-retaining and heat-insulating effect.

The sewage purified in the aerobic tank 5 is moved to the accelerated oxidation tank 6 via the communication pipe 14. Then, the sewage purified in 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 a 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 is returned to the anaerobic tank 3 and discharged from the discharge port of the solid-liquid separator 20 so that it can be removed.

As shown in FIGS. 8 to 11 (a), the sewage purification system 53 of the present embodiment includes an in-line accelerated oxidation device (micro bubble generator) 62, and creates micro bubbles in the accelerated oxidation tank 6. It is designed to be able to occur. Then, according to such a configuration, the fine solid matter that has flowed in 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 matter from the system is promoted. Can be done.

More specifically, the in-line accelerated oxidizing device (micro bubble generator) 62 is installed in the accelerated oxidizing device main body 63 and the accelerated oxidizing tank 6, and is connected to one end of the accelerated oxidizing device main body 63 via a pump pipe 64. It is provided with a submersible pump 65 and a discharge pipe 66 connected to the other end of the accelerated oxidation device main body 63.
The accelerator oxidizer main body 63 includes an injected type nano-micro bubble generation nozzle 67 connected to the pumping pipe 64, and a gas-liquid mixing pipe 68 arranged in order between the nano-micro bubble generation nozzle 67 and the discharge pipe 66. , Cylindrical ultrasonic injection transducer 69, and ozone (O ₃ ) gas and hydrogen peroxide solution (H ₂ O ₂ ) can be sent to the nano-micro bubble generation nozzle 67 part alone or in combination. It has been made.
The electrolysis tanks 33 made of cylindrical tanks are concentrically arranged in the accelerated oxidation tank 6, and the TiO2 positive 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 a communication hole 47. The submersible pump 65 of the in-line accelerated oxidation device (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 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 a PVC (polyvinyl chloride) material may be typically used.

The accelerated oxidation tank 6 having the above configuration can intentionally generate hydroxyl radicals to improve and promote the oxidizing power. In other words, by using ozone, hydrogen peroxide, and even ultraviolet rays (UV) in combination, it is possible to generate OH radicals, which are powerful oxidizing agents, and decompose and remove persistent pollutants in water. Become. In particular, it can be expected to exert an excellent effect on the decomposition and removal of fine pollutants such as dioxins, environmental hormones, and pesticides. 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 there is almost no secondary waste. Is obtained. Furthermore, by using ozone or the like, it is possible to simultaneously bring about effects such as decolorization, deodorization, COD reduction, and sterilization in sewage.
Further, in the oxidative decomposition in the accelerated oxidation tank 6, by further combining the 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 accelerated oxidation tank 6 and the electrolysis tank 33 and the in-line accelerated oxidation device 62, the nanomicrobubble generating nozzle 67 and the gas and liquid The spiral flow generated by the mixing tube 68 and the cylindrical ultrasonic injection oscillator 69 becomes a swirling flow and promotes the reaction. That is, according to the configuration of the accelerated oxidation tank (whirlpool type accelerated oxide tank) 6 of the present embodiment provided with the cylindrical electrolysis tank 33 and the in-line accelerated oxidation device 62, the conventional accelerated oxide tank Compared to this, it can be stirred more efficiently, so (1) the reaction efficiency with organic substances is good, (2) the reaction rate is fast, (3) there is no reaction blind spot, (4) the amount of ozone required is small, (5). The effect of low running cost can be obtained.
In this case, the nanomicrobubbles (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 millibubbles having a diameter of about 1 to 10 mm. That is, according to the configuration of the accelerated oxidation tank (whirlpool type accelerated oxidation tank) 6 of the present embodiment provided with the cylindrical electrolysis tank 33 and the in-line accelerated oxidation device 62, for dissolving ozone gas. The dissolution rate can be increased without using a pressurized dissolution tank.

As shown in FIGS. 7 to 9, the sewage purified in the accelerated oxidation tank 6 is moved to the biological aeration tank 54 through the communication hole 57. Then, the sewage 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 immobilized.

The sewage purified in the biological aeration tank 54 is moved to the first membrane separation tank 7 via the communication pipe 15. Then, the sewage purified in the biological aeration tank 54 is purified by membrane separation in the first membrane separation tank 7.
The first membrane separation tank 7 has properties as so-called coarse separation as compared with the second membrane separation tank 10 described later, and a UF membrane (ultrafiltration membrane) 49 is used as the membrane (membrane). Has been done.
In FIG. 8, reference numeral 50 indicates an air diffuser, and the air diffuser 50 functions to supply oxygen to activated sludge and clean the membrane surface by an ascending flow of bubbles.

The sewage 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 sewage 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 type nano-micro bubble inject, and the nano-micro bubble inject 51 generates nano-micro bubbles containing ozone to generate a first membrane separation tank 7 It is possible to further purify the sewage that has been purified in. Further, reference numeral 72 indicates a TiO ₂ ball which is a photocatalyst, and the sterilization treatment can be performed only by irradiating the TiO ₂ ball with ultraviolet rays.

The sewage purified in the ozone contact tank 8 is moved to the bioactivated carbon tank 9 via the communication pipe 16. Then, the sewage purified in 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 sewage purified in the bioactivated 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., and the treated water tank 55 Will be returned to. If the water quality conforms to 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. Further, the treated water obtained by purification treatment by membrane separation using an 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 sewage purification system 53 of the present embodiment can also be applied to, for example, purification treatment of sewage supplied from a sewage tank (sewage generation source) in a toilet room.

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

As described above, the present invention has been described, but the usefulness of the present invention will be supplementarily explained.
In recent years, the following have become important technical issues regarding the treatment of organic substances.
(1) Eliminate chemicals such as polymer flocculants and reduce the amount of industrial waste treated.
(2) In order to solve the problem of global water resource shortage, it is possible to decompose and purify sewage to the extent that it can be reused as industrial water, as well as discharge treatment of sewage.
(3) Compact and economical.
(4) It is possible to purify persistent substances such as decolorization of livestock manure treatment and removal of trace chemical substances and pathogenic microorganisms.

For the treatment of contaminated water, the microbial treatment method has been conventionally adopted. 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 a huge amount of equipment, and there is a problem that it cannot decompose persistent substances and is not a perfect treatment method. Therefore, in order to decompose persistent substances that cannot be treated by microbial treatment alone into easily degradable substances that are easy to biodegrade, a new treatment method that can be combined with the biodegradation method has been developed. 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 extremely useful for microbial treatment methods that require dissolved oxygen because it does not generate secondary waste such as sludge during 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 some substances have low reactivity with ozone and decompose. It has a problem in that there are substances that are difficult to use.

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

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

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

1. 1. Anaerobic tank (A) + anoxic 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 provided again after accelerated oxidation treatment from the biological treatment method of the A2O method. By locating the anaerobic tank in front of the solid-liquid separator, the PAO bacteria that have overdose the floating slatch and phosphorus are returned to the raw water anaerobic tank for treatment. In addition, the injection of methanol can be omitted by providing an oxygen-free tank before the accelerated oxidation tank, removing biological nitrogen and phosphorus, and using an organic substance as the carbon source required for removing nitrogen. Furthermore, by providing an accelerated oxidation tank and combining it with a biological treatment method, it has the following advantages or technical features.
(1) Conventional biological treatments such as the activated sludge method require precipitation and dehydration after aeration, but the floating treatment of sludges with nanomicrobubbles in the accelerated oxidation tank eliminates the need for precipitation and dehydration.
(2) In addition to biologically treating hydrogen peroxide in the accelerated oxidation tank, ozone and hydrogen peroxide eventually become oxygen and can maintain a high oxygen concentration in the treated water, so this is biologically treated (treatment with aerobic bacteria). ) Is available.
(3) It provides a new method of hydroxyl radical generation called ozone + high molecular weight organic acid catalyst. That is, humic acid and fulvic acid are released by suspending humus in the accelerated oxidation tank. Alternatively, liquid humic acid (Humic Acid) and fulvic acid (Fulvic Acid) are directly supplied, thereby catalyzing the generation of hydroxyl radicals.
(4) Since the slatch can be levitated by using nanomicrobubbles in the accelerated oxidation tank and separated by the scum pump, the settling tank and dehydration process are not required.
(5) Development of an integrated in-line accelerated oxidation device optimized for the accelerated oxidation tank.
(6) Development of an integrated gas-liquid injection method with an injector.
(7) As a structural feature of the accelerated oxidation tank, a cylindrical shape is used to create a swirling flow.
(8) Since the nano-micro bubble generation nozzle enables efficient dissolution, a conventional high-pressure tank for increasing the ozone dissolution rate is not required.

Further, according to the present invention, the system can be made compact and the purification capacity can be improved, and has the following advantages or technical features.
(1) Compactness such as aeration tank capacity, aeration time, and omission of piping.
(2) No secondary waste such as purification treatment by-products and sediments.
(3) Reduce the amount of industrial waste and eliminate the global shortage of water resources.
(4) Optimal as industrial water because it eliminates chemicals such as polymer flocculants (for eliminating bulking, defoaming agents, etc.) and leaves no chemical components in the final treated water.
(5) The quality of organic fertilizer is improved for solids after solid-liquid separation of livestock manure.
(6) Cohesive agent Development and use of cohesive biopolymer (microbial flocculant) when necessary.

1,53 Sewage purification system 3 Anaerobic tank 4 Anoxic tank 5 Aerobic tank 6 Accelerated oxidation tank 12,13 Communication hole 14 Communication pipe 19 Submersible pump 20 Solid-liquid separator (decanter)
21 1st transfer pipe 22 2nd transfer pipe 31 Scum pump 32 5th return pipe

Claims (11)

An anaerobic tank that purifies sewage supplied from a sewage source with anaerobic bacteria,
An oxygen-free tank that purifies the sewage that has been purified in the anaerobic tank with denitrifying bacteria, and
An aerobic tank that purifies the sewage that has been purified in the oxygen-free tank with aerobic bacteria,
An accelerated oxide tank that purifies the sewage purified in the aerobic tank by oxidative decomposition.
With
A sewage purification system in which each of these tanks is placed close to one or more of the other tanks and the water level in each tank is kept the same.
A submersible pump that starts intermittently is installed in the anaerobic tank.
One end of the first transfer pipe whose other end is connected to the inflow port of the solid-liquid separator is connected to the submersible pump.
One end of a second transfer pipe whose other end is located in the oxygen-free tank is connected to the outlet of the solid-liquid separator.
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,
The first membrane separation tank that purifies the sewage purified in the accelerated oxidation tank by membrane separation, and
An ozone contact tank that purifies the sewage purified in the first membrane separation tank with ozone, and
A bioactivated carbon tank that purifies the sewage purified in the ozone contact tank with bioactivated carbon, and
A sewage purification system characterized by being equipped with. An anaerobic tank that purifies sewage supplied from a sewage source with anaerobic bacteria,
An oxygen-free tank that purifies the sewage that has been purified in the anaerobic tank with denitrifying bacteria, and
An aerobic tank that purifies the sewage that has been purified in the oxygen-free tank with aerobic bacteria,
An accelerated oxide tank that purifies the sewage purified in the aerobic tank by oxidative decomposition.
With
A sewage purification system in which each of these tanks is placed close to one or more of the other tanks and the water level in each tank is kept the same.
A submersible pump that starts intermittently is installed in the anaerobic tank.
One end of the first transfer pipe whose other end is connected to the inflow port of the solid-liquid separator is connected to the submersible pump.
One end of a second transfer pipe whose other end is located in the oxygen-free tank is connected to the outlet of the solid-liquid separator.
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 that purifies the sewage purified in the accelerated oxidation tank by biological treatment.
The first membrane separation tank that purifies the sewage purified in the biological aeration tank by membrane separation and
An ozone contact tank that purifies the sewage purified in the first membrane separation tank with ozone, and
A bioactivated carbon tank that purifies the sewage purified in the ozone contact tank with bioactivated carbon, and
A sewage purification system characterized by being equipped with. The first or second claim, wherein the oxidative decomposition in the accelerated oxidation tank is performed by any or a combination of ozone supply, hydrogen peroxide supply, high molecular weight organic acid supply, UV irradiation, and ultrasonic injection. Sewage purification system. The sewage purification system according to claim 3 , wherein the high molecular weight organic acid contains at least one or more of fulvic acid and humic acid. The sewage purification system according to claim 3 or 4 , wherein the oxidative decomposition in the accelerated oxidation tank is further combined with electrolysis. The sewage purification system according to claim 5 , wherein the accelerated oxidation tank includes an electrolysis tank at the center thereof. The sewage purification system according to any one of claims 1 to 6, further comprising a micro-bubble generator and generating micro-bubbles at the bottom of the accelerated oxidation tank to suspend solid matter. The sewage 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 sewage purification system according to claim 1 , further comprising a second membrane separation tank for purifying the sewage purified in the bioactivated carbon tank by membrane separation. A treated water tank that stores sewage purified by a biological activated carbon tank,
The sewage purification system according to claim 2, further comprising a second membrane separation tank in which the treated water stored in the treated water tank is transferred and the treated water is purified by membrane separation. The 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 sewage purification system according to claim 9 or 10, which is selected from any one or more of the above.