A superoxide photocatalytic oxidation tail vegetable wastewater treatment device and treatment method

Abstract

The present invention discloses a superoxide photocatalytic oxidation wastewater treatment device and a treatment method, which relates to the technical field of sewage treatment, and includes the following steps: S1: inputting wastewater into an ME micro-electrolysis reactor, adding acid for stirring reaction, and then performing intermittent aeration, and the wastewater contacts the filler inside the ME micro-electrolysis reactor under the action of airflow to generate a micro-electrolysis reaction; S2: inputting the wastewater after the micro-electrolysis reaction into a sedimentation tank, and adding alkali for stirring reaction. The present invention uses micro-electrolysis to decolorize, break chains and rings, destroy molecular structures, and turn difficult to degrade into easy to degrade, superoxide photocatalytic oxidation for oxidative decolorization, removes odors, and oxidizes macromolecules into small molecules at the same time, and the ecological composite bed finally converts small molecules and nitrogen and phosphorus into carbon dioxide, water, nitrogen and other inorganic substances, which plays an important role in developing the vegetable industry, solving the environmental pollution problems caused by industrial development, and realizing the recycling of freshwater resources.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a device and method for treating wastewater by photocatalytic oxidation of wastewater with superoxide. Background Art

[0002] One of the problems facing the world today is the disposal of various types of waste and the energy crisis. With the rapid development of the crop industry, the amount of agricultural waste is also increasing. Due to the high moisture content, perishability and poor storage resistance of vegetables, a large amount of waste will be generated during the harvest and sales process, also known as "tail vegetables". The main methods of treating vegetable waste include crushing and direct discharge, landfill, incineration, composting, feed and anaerobic fermentation. The solid content of vegetable waste is 10%, and the moisture content is as high as 90%. Due to the high content of organic components, the stacking or landfill of vegetable waste will produce a large amount of leachate, causing serious environmental pollution.

[0003] At present, the tail water generated by vegetable waste treatment can only meet the water quality standards for discharge into urban sewers. However, vegetable waste disposal sites are generally far away from towns and cities, and longer discharge pipes need to be laid to collect them. At the same time, vegetable planting around vegetable waste disposal sites requires a large amount of irrigation water, and surface water or groundwater needs to be extracted for irrigation, resulting in a huge waste of water resources. Laying pipelines also requires occupying land and increasing investment.

[0004] After the wastewater from the tail vegetable is biochemically treated, cellulose, lignin, anthocyanin, long-chain fatty compounds and a small amount of alkaloids that are extremely difficult for microorganisms to degrade exist in the water. Lignin is a complex and tough polymer that is difficult for microorganisms to decompose. Anthocyanin is a water-soluble pigment that exists in the tail water of the tail vegetable. It is not easily metabolized and utilized by microorganisms, making the tail water appear brownish yellow. Long-chain fatty compounds are difficult to be completely decomposed by microorganisms. These substances cause the COD and total salt content in the effluent to be high, brownish yellow, and poor biodegradability. If they are not deeply treated, they cannot be utilized as resources for agricultural irrigation.

[0005] Therefore, the resource utilization of tail water after wastewater disposal, the environmental pollution caused by industrial development, and the recycling of freshwater resources are issues that need to be addressed urgently. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to propose a superoxide photocatalytic oxidation tail water wastewater treatment device and treatment method which can make use of tail water resources, reduce environmental pollution problems and realize the recycling of fresh water resources.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for treating wastewater from vegetable waste by photocatalytic oxidation of superoxide, comprising the following steps:

[0009] S1: The wastewater is input into the ME micro-electrolysis reactor, and the acid is added for stirring reaction, followed by intermittent aeration. Under the action of the airflow, the wastewater contacts the filler inside the ME micro-electrolysis reactor to cause micro-electrolysis reaction;

[0010] S2: The wastewater after micro-electrolysis reaction is input into the sedimentation tank, alkali is added for stirring reaction, and then mud and water are separated;

[0011] S3: The supernatant after the mud-water separation is input into the superoxide photocatalytic oxidation reactor, and the superoxide photocatalytic oxidation reactors connected in series react step by step. Under the action of ultraviolet light and catalyst, the pollutants in the wastewater are oxidized and decomposed into hydroxyl free radicals by superoxide;

[0012] S4: The wastewater treated by the superoxide photocatalytic oxidation reactor is input into the ecological composite bed, and the reaction is carried out step by step through the ecological composite beds connected in series.

[0013] Furthermore, in S1, the ME micro-electrolysis reactor uses iron and carbon to form tiny primary cells to electrolyze the wastewater.

[0014] Furthermore, in S3, superoxide is input into a superoxide photocatalytic oxidation reactor, the wastewater contacts the superoxide, and then the particulate matter in the wastewater is intercepted by a water distribution screen. Finally, the wastewater contacts the superoxide on the surface of the catalyst, and the catalyst adsorbs the pollutants in the wastewater, intercepts the pollutants, provides a reaction medium for the reaction, and accelerates the reaction rate of the pollutants and the superoxide.

[0015] Furthermore, when sewage contacts superoxide on the catalyst surface, superoxide decomposes to produce hydroxyl radicals through the synergistic effect of ultraviolet light, so that the oxidation reaction in water, which is mainly the direct reaction of superoxide with organic matter, is transformed into an oxidation reaction mainly the direct reaction of free radicals with organic matter.

[0016] Furthermore, in S3, the wastewater treated by the superoxide photocatalytic oxidation reactor is input into the intermediate pool, and the wastewater in the intermediate pool is input into the superoxide photocatalytic oxidation reactor again through a water pump for circulation treatment.

[0017] Furthermore, in S4, the roots of floating plants in the ecological composite bed absorb nitrogen and phosphorus pollutants in the wastewater, and at the same time, the algae in the ecological composite bed release oxygen through photosynthesis to provide oxygen and nutrients for the bacteria in the bacterial bags for aerobic reactions, and the small molecular organic matter, nitrogen and phosphorus decomposed by the bacteria are absorbed by the algae.

[0018] In view of the above-mentioned superoxide photocatalytic oxidation tail vegetable wastewater treatment method, the present invention also provides a superoxide photocatalytic oxidation tail vegetable wastewater treatment device, comprising a ME micro-electrolysis reactor, a sedimentation tank, a superoxide photocatalytic oxidation reactor and an ecological composite bed connected in sequence;

[0019] The inside of the ME micro-electrolysis reactor is provided with a sieve plate, an aeration pipe, a filler and an acid stirring chamber from bottom to top. The acid stirring chamber is connected to a water pump to allow wastewater to enter the acid stirring chamber. The acid stirring chamber is connected to an acid tank;

[0020] The sedimentation tank is connected to the ME micro-electrolysis reactor through an overflow pipe. The sedimentation tank is provided with an inclined pipe and an alkaline stirring chamber from bottom to top, and the alkaline stirring chamber is connected to an alkali tank.

[0021] The superoxide photocatalytic oxidation reactor includes a superoxide generator and a plurality of reactors connected in series, wherein each reactor is provided with a micro-nano bubble releaser, a water distribution screen, a catalyst and an ultraviolet lamp in sequence from bottom to top, and the superoxide generator is connected to each micro-nano bubble releaser;

[0022] The ecological composite bed includes a plurality of reaction modules connected in series. The interior of each reaction module is provided with planting expanded clay, activated carbon, volcanic stone and floating plate from bottom to top. The floating plate is provided with a plurality of floating plant planting holes for planting floating plants. A fungus bag is provided at the bottom of the floating plate.

[0023] Further, the filler is arranged on the top of the sieve plate, and the aeration pipe is arranged between the filler and the sieve plate;

[0024] A mud hopper is provided at the bottom of the ME micro-electrolysis reactor and the sedimentation tank, a mud discharge pipe is provided at the bottom of the mud hopper, a guide pipe is provided at the bottom of the acidic stirring chamber and the alkaline stirring chamber, the two guide pipes respectively penetrate to the bottom of the filler and the bottom of the inclined tube, and a reflector is provided at the bottom of the two guide pipes, which is conical.

[0025] Furthermore, the reactor of the superoxide photocatalytic oxidation reactor is a columnar tubular structure, each reactor is provided with a bracket on the outside, each reactor is provided with a water inlet at the bottom, an overflow port and a water outlet at the top, the water outlet of one reactor is connected to the water inlet of another reactor, the ultraviolet lamp is in the shape of a long strip, and the ultraviolet lamp extends into the catalyst, the catalyst is a granular catalyst with a large specific surface area, and each reactor is provided with an exhaust port on the top.

[0026] Furthermore, the reaction modules of the ecological composite bed are arranged vertically and spaced apart, and a downpipe is provided between the reaction modules, and a water level control valve is provided on the downpipe, the topmost reaction module is provided with a water inlet, and the bottommost reaction module is provided with a water outlet;

[0027] The ecological composite bed also includes a circulation pump, the water inlet of the circulation pump is connected to the bottommost reaction module, and the water outlet is connected to the topmost reaction module, so that water circulates through each reaction module.

[0028] The beneficial effects of the present invention are:

[0029] In the present invention, micro-electrolysis is used for decolorization, chain and ring breaking, and molecular structure destruction, so that the difficult-to-degrade substances become easily degradable. Superoxide photocatalytic oxidation is used for oxidative decolorization and odor removal, and at the same time, macromolecules are oxidized into small molecules. The ecological composite bed finally converts small molecules and nitrogen and phosphorus into carbon dioxide, water, nitrogen and other inorganic substances.

[0030] It can effectively remove chromaticity, reduce the content of cellulose and lignin, break the long-chain fatty compounds, reduce COD concentration, and reuse the tail water of vegetable processing wastewater after treatment to achieve resource utilization of wastewater. It adopts physical, biological and ecological methods without generating secondary pollution. It is environmentally friendly, green, has low processing cost and high efficiency. It plays an important role in developing the vegetable industry, solving the environmental pollution problems caused by industrial development, and realizing the recycling of freshwater resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a process for treating vegetable wastewater by photocatalytic oxidation of superoxide proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a ME micro-electrolysis reactor and a sedimentation tank of a superoxide photocatalytic oxidation tail vegetable wastewater treatment device proposed by the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a superoxide photocatalytic oxidation reactor of a superoxide photocatalytic oxidation tail vegetable wastewater treatment device proposed by the present invention;

[0034] Figure 4 This is a schematic diagram of the ecological composite bed structure of a superoxide photocatalytic oxidation tail vegetable wastewater treatment device proposed by the present invention;

[0035] Figure 5 This is a schematic diagram of the top view of the ecological composite bed of a superoxide photocatalytic oxidation tail vegetable wastewater treatment device proposed by the present invention;

[0036] Figure 6 This is a table of effluent quality and pollutant removal rate after treatment by a superoxide photocatalytic oxidation tail vegetable wastewater treatment device proposed in the present invention.

[0037] In the figure: 1 superoxide generator, 2 ultraviolet lamp, 3 reactor, 4 catalyst, 5 bracket, 6 water screen, 7 micro-nano bubble releaser, 8 reaction module, 9 downpipe, 10 volcanic stone, 11 activated carbon, 12 planting ceramsite, 13 floating plants, 14 bacteria bag, 15 floating plate, 16 circulation pump, 17 floating plant planting hole, 18 water level control valve, 19 ME micro-electrolysis reactor, 20 filler, 21 sieve plate, 22 acid tank, 23 acid mixing chamber, 24 alkali tank, 25 alkaline mixing chamber, 26 guide pipe, 27 inclined pipe, 28 reflection plate, 29 sedimentation tank. DETAILED DESCRIPTION

[0038] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0041] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0042] Example 1

[0043] Reference Figure 1 A superoxide photocatalytic oxidation method for treating tail water is applied to sewage treatment in order to make resource utilization of tail water, reduce environmental pollution problems and realize the recycling of fresh water resources.

[0044] The superoxide photocatalytic oxidation method for treating wastewater from vegetable wastewater comprises the following steps:

[0045] S1: Wastewater is pumped from the sump through a water pump into the acidic stirring chamber in the ME micro-electrolysis reactor, and acid is added for stirring reaction to adjust the pH value of the wastewater to 3. The stirred wastewater is then directed to the bottom of the filler through a diversion tube and intermittently aerated through an aeration tube. Under the action of the airflow, the wastewater contacts the filler inside the ME micro-electrolysis reactor to cause a micro-electrolysis reaction. The micro-electrolysis reaction uses iron and carbon to form tiny primary cells to electrolyze the wastewater, destroy the chromophores, and reduce the chromaticity of the wastewater. At the same time, cellulose is decomposed into polysaccharides or monosaccharides, lignin is decomposed into aromatic compounds, and long-chain fatty compounds are broken to form low-molecular organic matter. The reaction time is 1-3h, which reduces the chromaticity of the wastewater, increases the pH to 7.8, and increases the COD.

[0046] S2: After the micro-electrolysis reaction, the wastewater enters the sedimentation tank through the overflow weir at the top of the ME micro-electrolysis reactor. Alkali is added for stirring reaction to adjust the pH value of the wastewater to 7. Then the wastewater is allowed to enter the bottom of the sedimentation tank through the diversion pipe for water distribution. The wastewater of the mud-water mixture passes through the inclined pipe under the action of gravity. The heavier mud sinks into the mud hopper and is discharged. The water passes through the inclined pipe and is discharged from the upper water outlet weir of the sedimentation tank, completing the mud-water separation. The supernatant enters the next treatment unit.

[0047] S3: The supernatant after mud-water separation enters the superoxide photocatalytic oxidation reactor, and reacts step by step through the superoxide photocatalytic oxidation reactors connected in series. The superoxide generator produces superoxide, which first contacts the wastewater, and the wastewater is evenly distributed through the water distribution screen to intercept particulate matter. Then the sewage contacts the superoxide on the catalyst surface. The catalyst adsorbs pollutants in the wastewater, intercepts pollutants, provides a reaction medium for the reaction, and accelerates the reaction rate of pollutants and superoxide. Under the synergistic effect of ultraviolet light, superoxide decomposes to produce hydroxyl free radicals, so that the oxidation reaction in the water, which is mainly the direct reaction of superoxide with organic matter, is transformed into the oxidation reaction which is mainly the direct reaction of free radicals with organic matter. The oxidation potential is increased, and the anthocyanin and carotene chromophores are rapidly oxidized and decomposed. Aromatic organic matter and unsaturated compounds in the wastewater absorb ultraviolet light, and hydroxyl radicals are more likely to react with aromatic compounds and unsaturated compounds to remove organic matter in the wastewater. Under the action of ultraviolet light and particulate catalysts, pollutants in the water are superoxide-generated hydroxyl radicals to oxidize and decompose organic matter and chromophores. The wastewater becomes clear and transparent in 5-10 minutes, and complete decolorization is achieved. The B / C increases to 0.28 at 60 minutes and to 0.36 at 120 minutes. The COD removal rate is 30%-65%. The wastewater treated by the superoxide photocatalytic oxidation reactor is input into the intermediate tank, and the wastewater in the intermediate tank is again input into the superoxide photocatalytic oxidation reactor through a water pump for circulation treatment to improve the wastewater treatment effect.

[0048] S4: After the wastewater is circulated and treated in the superoxide photocatalytic oxidation reactor, it enters the ecological composite bed with an area of ​​2m 2 The bed thickness is 200mm, and the reaction is carried out step by step through the ecological composite beds connected in series. The hydraulic retention time is 10h and the surface load is 10L / m 2 ·d, circulation rate 100%, the plant roots in the ecological composite bed absorb nitrogen and phosphorus pollutants in the wastewater, and at the same time, the algae in the ecological composite bed release oxygen through photosynthesis to provide oxygen and nutrients for bacteria to carry out aerobic reactions. The small molecular organic matter, nitrogen and phosphorus decomposed by bacteria will be used by the algae.

[0049] Example 2

[0050] In view of the above-mentioned method for treating wastewater from vegetable waste by photocatalytic oxidation of superoxide, this embodiment provides a device for treating wastewater from vegetable waste by photocatalytic oxidation of superoxide;

[0051] Reference Figure 2-5 The superoxide photocatalytic oxidation tail vegetable wastewater treatment device comprises a ME micro-electrolysis reactor 19, a sedimentation tank 29, a superoxide photocatalytic oxidation reactor and an ecological composite bed connected in sequence.

[0052] The interior of the ME micro-electrolysis reactor 19 is provided with a sieve plate 21, an aeration pipe, a filler 20 and an acidic stirring chamber 23 from bottom to top. The filler 20 is arranged on the top of the sieve plate 21 to ensure support for the filler 20 and to ensure that pollutants can be precipitated through the sieve plate 21 on the mud bucket at the bottom of the ME micro-electrolysis reactor 19. The aeration pipe is arranged between the filler 20 and the sieve plate 21. The aeration pipe is connected to an external fan. The aeration pipe is intermittently aerated to effectively reduce the disturbance of pollutant precipitation. The acidic stirring chamber 23 is connected to a water pump to allow wastewater to enter the acidic stirring chamber 23. The acidic stirring chamber 23 is connected to an acid tank 22. Acid is added to the wastewater through the acid tank 22 to adjust the pH value of the wastewater.

[0053] The sedimentation tank 29 is connected to the ME micro-electrolysis reactor 19 through an overflow pipe, so that the wastewater after the micro-electrolysis reaction enters the sedimentation tank 29. The sedimentation tank 29 is provided with an inclined tube 27 and an alkaline stirring chamber 25 from bottom to top. The inclined tube 27 can separate mud and water, thereby performing wastewater sedimentation treatment. The alkaline stirring chamber 25 is connected to an alkali tank 24, and alkali is added to the wastewater through the alkali tank 24 to adjust the pH value of the wastewater.

[0054] The bottom of the ME micro-electrolysis reactor 19 and the sedimentation tank 29 are both provided with a mud bucket, and the bottom of the mud bucket is provided with a mud discharge pipe to facilitate the discharge of pollutant precipitation. The bottom of the acidic stirring chamber 23 and the alkaline stirring chamber 25 are both provided with a guide pipe 26, and the two guide pipes 26 respectively penetrate the bottom of the filler 20 and the bottom of the inclined tube 27. One guide pipe 26 facilitates the wastewater to reach the bottom of the filler to facilitate the micro-electrolysis reaction, and the other guide pipe 26 facilitates the wastewater to reach the bottom of the inclined tube 27 for mud and water separation. The bottom of the two guide pipes 26 is provided with a reflector 28, and the reflector 28 is conical, so as to evenly distribute water and avoid disturbing the pollutant precipitation.

[0055] The superoxide photocatalytic oxidation reactor comprises a superoxide generator 1 and a plurality of reactors 3 connected in series. A micro-nano bubble releaser 7, a water distribution screen 6, a catalyst 4 and an ultraviolet lamp 2 are arranged in sequence from bottom to top inside each reactor 3. The superoxide generator 1 is connected to each micro-nano bubble releaser 7. The reactor 3 of the superoxide photocatalytic oxidation reactor is a columnar tubular structure. A bracket 5 is arranged outside each reactor 3. A water inlet is arranged at the bottom of each reactor 3, and an overflow port and a water outlet are arranged at the top. The water outlet of one reactor 3 is connected to the water inlet of another reactor 3. The ultraviolet lamp 2 is in a long strip shape, and the ultraviolet lamp 2 extends into the catalyst 4. The catalyst 4 is a granular catalyst with a large specific surface area. An exhaust port is arranged at the top of each reactor 3. The superoxide photocatalytic oxidation reactor can effectively remove organic matter in wastewater and improve the biodegradability of wastewater. The reactors 3 can be operated in series to achieve sewage purification by decomposing pollutants in wastewater step by step.

[0056] The ecological composite bed includes a circulation pump 16 and a plurality of reaction modules 8. The interior of each reaction module 8 is provided with planting expanded clay 12, activated carbon 11, volcanic rock 10 and a floating plate 15 from bottom to top. The floating plate 15 is provided with a plurality of floating plant planting holes 17. The floating plant planting holes 17 are used to plant floating plants 13. A bacterial bag 14 is provided at the bottom of the floating plate 15. The roots of the floating plants 13 will be implanted in the bed layer to absorb pollutants such as nitrogen and phosphorus in the wastewater. At the same time, an algae-bacteria symbiotic system will be formed under the floating plate 15. The algae release oxygen through photosynthesis to provide oxygen and nutrients for bacteria for aerobic reactions. The small molecular organic matter, nitrogen and phosphorus decomposed by the bacteria will be used by the algae, thereby reducing the pollutants in the sewage.

[0057] The reaction modules 8 of the ecological composite bed are arranged vertically at intervals and connected in series, so that each reaction module 8 decomposes pollutants in the wastewater step by step, and the wastewater is purified step by step through the ecological composite bed. Downpipes 9 are provided between the reaction modules 8, and a water level control valve 18 is provided on the downpipe 9. The topmost reaction module 8 is provided with a water inlet, and the bottommost reaction module 8 is provided with a water outlet. The water inlet of the circulation pump 16 is connected to the bottommost reaction module 8, and the water outlet is connected to the topmost reaction module 8, so that the water flow circulates through each reaction module 8. Each reaction module 8 has a relatively complete ecosystem, so the treatment efficiency is high and the system is stable. At the same time, it can also be circulated through the circulation pump 16, which has a dilution and buffering effect even when the water inlet load is high, ensuring that the system is more stable. The internal circulation and the downpipe 9 can reoxygenate the wastewater to increase the oxygen content in the water, thereby improving the purification effect.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for treating wastewater from vegetable waste by photocatalytic oxidation of superoxide, characterized in that: The steps include: S1: The wastewater is input into the ME micro-electrolysis reactor, and the acid is added for stirring reaction, followed by intermittent aeration. Under the action of the airflow, the wastewater contacts the filler inside the ME micro-electrolysis reactor to cause micro-electrolysis reaction; S2: The wastewater after micro-electrolysis reaction is input into the sedimentation tank, alkali is added for stirring reaction, and then mud and water are separated; S3: The supernatant after the mud-water separation is input into the superoxide photocatalytic oxidation reactor, and the superoxide photocatalytic oxidation reactors connected in series react step by step. Under the action of ultraviolet light and catalyst, the pollutants in the wastewater are oxidized and decomposed into hydroxyl free radicals by superoxide; S4: The wastewater treated by the superoxide photocatalytic oxidation reactor is input into the ecological composite bed, and the reaction is carried out step by step through the ecological composite beds connected in series.

2. A method for treating vegetable wastewater by photocatalytic oxidation of superoxide according to claim 1, characterized in that: In S1, the ME micro-electrolysis reactor uses iron and carbon to form a tiny primary cell to electrolyze the wastewater.

3. A method for treating vegetable wastewater by photocatalytic oxidation of superoxide according to claim 1, characterized in that: In S3, superoxide is input into the superoxide photocatalytic oxidation reactor, wastewater contacts with superoxide, and then particulate matter in the wastewater is intercepted by a water distribution screen. Finally, the wastewater contacts with superoxide on the surface of the catalyst, and the catalyst adsorbs pollutants in the wastewater, intercepts pollutants, provides a reaction medium for the reaction, and accelerates the reaction rate of pollutants and superoxide.

4. A method for treating vegetable wastewater by photocatalytic oxidation of superoxide according to claim 3, characterized in that: When sewage comes into contact with superoxide on the catalyst surface, superoxide decomposes to produce hydroxyl radicals through the synergistic effect of ultraviolet light, which transforms the oxidation reaction in water that is mainly the direct reaction of superoxide with organic matter into an oxidation reaction that is mainly the direct reaction of free radicals with organic matter.

5. The method for treating vegetable wastewater by photocatalytic oxidation of superoxide according to claim 1, characterized in that: In S3, the wastewater treated by the superoxide photocatalytic oxidation reactor is input into the intermediate pool, and the wastewater in the intermediate pool is input into the superoxide photocatalytic oxidation reactor again through a water pump for circulation treatment.

6. A method for treating vegetable wastewater by photocatalytic oxidation of superoxide according to claim 1, characterized in that: In S4, the roots of the floating plants in the ecological composite bed absorb nitrogen and phosphorus pollutants in the wastewater, and at the same time, the algae in the ecological composite bed release oxygen through photosynthesis to provide oxygen and nutrients for the bacteria in the bacteria bags to carry out aerobic reactions, and the small molecular organic matter, nitrogen and phosphorus decomposed by the bacteria are absorbed by the algae.

7. A superoxide photocatalytic oxidation tail vegetable wastewater treatment device, characterized in that: It includes a ME micro-electrolysis reactor (19), a sedimentation tank (29), a superoxide photocatalytic oxidation reactor and an ecological composite bed connected in sequence; The ME micro-electrolysis reactor (19) is provided with a sieve plate (21), an aeration pipe, a filler (20) and an acid stirring chamber (23) in order from bottom to top. The acid stirring chamber (23) is connected to a water pump so that wastewater enters the acid stirring chamber (23). The acid stirring chamber (23) is connected to an acid tank (22); The sedimentation tank (29) is connected to the ME micro-electrolysis reactor (19) via an overflow pipe, and the sedimentation tank (29) is provided with an inclined tube (27) and an alkaline stirring chamber (25) in order from bottom to top, and the alkaline stirring chamber (25) is connected to an alkali tank (24); The superoxide photocatalytic oxidation reactor comprises a superoxide generator (1) and a plurality of reactors (3) connected in series, wherein each of the reactors (3) is provided with a micro-nano bubble releaser (7), a water distribution screen (6), a catalyst (4) and an ultraviolet lamp (2) in order from bottom to top, and the superoxide generator (1) is connected to each of the micro-nano bubble releasers (7); The ecological composite bed comprises a plurality of reaction modules (8) connected in series, wherein each reaction module (8) is provided with planting ceramsite (12), activated carbon (11), volcanic rock (10) and a floating plate (15) in order from bottom to top, wherein the floating plate (15) is provided with a plurality of floating plant planting holes (17), wherein the floating plant planting holes (17) are used to plant floating plants (13), and a fungus bag (14) is provided at the bottom of the floating plate (15).

8. The superoxide photocatalytic oxidation wastewater treatment device according to claim 7 is characterized in that: The filler (20) is arranged on the top of the sieve plate (21), and the aeration pipe is arranged between the filler (20) and the sieve plate (21); The bottoms of the ME micro-electrolysis reactor (19) and the sedimentation tank (29) are both provided with a mud bucket, and the bottoms of the mud bucket are provided with a mud discharge pipe. The bottoms of the acidic stirring chamber (23) and the alkaline stirring chamber (25) are both provided with a flow guide pipe (26), and the two flow guide pipes (26) respectively penetrate to the bottom of the filler (20) and the bottom of the inclined tube (27). The bottoms of the two flow guide pipes (26) are both provided with a reflection plate (28), and the reflection plate (28) is conical.

9. The superoxide photocatalytic oxidation wastewater treatment device according to claim 7 is characterized in that: The reactor (3) of the superoxide photocatalytic oxidation reactor is a columnar tubular structure. A bracket (5) is provided outside each reactor (3). Each reactor (3) is provided with a water inlet at the bottom, an overflow port and a water outlet at the top. The water outlet of one reactor (3) is connected to the water inlet of another reactor (3). The ultraviolet lamp (2) is in the shape of a long strip and extends into the catalyst (4). The catalyst (4) is a granular catalyst with a large specific surface area. An exhaust port is provided at the top of each reactor (3).

10. The superoxide photocatalytic oxidation wastewater treatment device according to claim 7 is characterized in that: The reaction modules (8) of the ecological composite bed are arranged vertically at intervals, and the reaction modules (8) are connected by downpipes (9), the downpipes (9) are provided with water level control valves (18), the topmost reaction module (8) is provided with a water inlet, and the bottommost reaction module (8) is provided with a water outlet; The ecological composite bed further comprises a circulation pump (16), the water inlet of the circulation pump (16) being connected to the reaction module (8) at the bottom, and the water outlet being connected to the reaction module (8) at the top, so that water circulates through each of the reaction modules (8).

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