An ozone advanced oxidation system for in-situ and extraction treatment of groundwater

Abstract

The present invention discloses an ozone advanced oxidation system for in-situ and extraction treatment of groundwater, comprising an ozone preparation device and an oxidation reaction device. The ozone prepared by the ozone preparation device can be switched to be introduced into an injection well at an anti-backflow tank of the oxidation reaction device for in-situ ozone oxidation or introduced into an ozone reaction tower of the oxidation reaction device. The ozone reaction tower is filled with a catalyst filler. Under the catalysis of the catalyst, the ozone reacts with sewage extracted to the ozone reaction tower to remove pollutants. The ozone advanced oxidation system of the present invention has a reasonable structure and is easy to operate. It can flexibly switch between the treatment methods of in-situ injection and extraction treatment according to different site conditions, thereby significantly improving the treatment efficiency of the ozone oxidation process for repairing groundwater pollution.

Description

Technical Field

[0001] The invention belongs to the field of environmental protection and relates to an ozone advanced oxidation system for in-situ extraction treatment of groundwater. Background Art

[0002] With the development of society, the discharge of organic waste is increasing day by day. Pollutants infiltrate vertically along the aeration zone and migrate and diffuse with groundwater flow, resulting in increasingly serious soil and groundwater pollution. Since the 1960s, groundwater pollution has gradually intensified, and groundwater remediation technology has also developed accordingly. Foreign countries have made great progress in groundwater pollution control, and gradually developed a relatively systematic groundwater pollution control technology. Common groundwater remediation technologies are roughly divided into three types: in-situ remediation technology, ex-situ remediation technology and natural attenuation remediation.

[0003] In-situ groundwater remediation technology refers to a method of restoring and treating pollution sources and polluted water bodies on site. Common forms include in-situ chemical oxidation, biological remediation, and permeable reaction wall remediation technology.

[0004] Patent CN111825222A relates to a tube-simulated in-situ bioremediation device, including an in-situ bioremediation test tube, an ex-situ treated water regulating tank connected to the in-situ bioremediation test tube, and a high-level carbon source supply tank. The interior of the in-situ bioremediation test tube is uniformly filled with simulated mineral-bearing aquifer ore, and both ends of the in-situ bioremediation test tube are blocked and have multiple sampling and monitoring ports. Patent CN109775862A involves the repair of reaction walls. The repair well is placed in the main well of groundwater reaction. The repair well includes a pumping well and an aeration well. The aeration well is provided with an aeration pipe, which is connected to the air compressor on the ground. The aeration pipe is installed at the bottom of the center of the repair well. The aeration well is equipped with an automatic sample collection device. The repair well and the main well of groundwater reaction are filled with filter material. The permeable reaction treatment unit includes a plurality of sandwich structure reaction unit components. Positioning connection grooves are provided between adjacent single reaction units. The connected reaction units are placed in the repair well pipe, and the mixed biological filler is loaded in the interlayer space of the reaction unit. The permeable reaction unit is equipped with a water quality analysis probe. The two-wing anti-seepage walls are placed on both sides of the repair well. The operation longitudinal depth of the two-wing anti-seepage walls penetrates the first layer of phreatic aquifer. The effluent monitoring pool is set below the ground, and the effluent monitoring pool is equipped with a water quality and water level automatic monitoring system. The automatic control system adopts a PLC control system. The chemical oxidation method by injecting Fenton reagent, persulfate, etc. is widely used in organic polluted sites in my country.

[0005] Fenton's reagent has a high redox potential and can oxidize most organic matter with a rapid reaction, but its reaction pH needs to be controlled at around 3, which can easily lead to damage to the natural ecosystem of groundwater.

[0006] When sodium persulfate is used as an oxidant, its decomposition can generate new active substances, sulfate free radicals. Under strong alkaline conditions, SO4 - ·Can be used with OH - The reaction generates more hydroxyl radicals ·OH, so sodium hydroxide solution is needed to adjust the pH of the sodium persulfate oxidation system. The addition of sodium hydroxide solution will cause the pH of groundwater and soil environment to drop, destroying the acid-base balance. In addition, the study on the generation mechanism of nitro byproducts in the advanced oxidation process of sulfate radicals pointed out that the strong oxidizing property of sulfate radicals allows it to effectively degrade organic pollutants while also oxidizing nitrite (NO2 - ), generating nitrogen dioxide free radicals (NO2·). As an electrophilic free radical, nitrogen dioxide free radicals can quickly react with humus in the environmental medium and transform into a series of nitroaromatic compounds such as nitrophenol and dinitrophenol. This type of pollutant has persistent and "three-hazard" toxicity of lethality, teratogenicity and mutagenicity, posing potential risks to the ecosystem and human health. In addition, SO4 2- , leading to groundwater SO4 2- Exceeding the standard makes it difficult to handle and also causes secondary pollution.

[0007] Ozone is an allotrope of oxygen with a redox potential of 2.07eV. It can oxidize a variety of organic pollutants in water to achieve the purpose of water purification. There are two main ways: one is the direct oxidation between ozone molecules and organic pollutants, and the other is the decomposition of ozone to produce hydroxyl radicals, which indirectly react with organic pollutants in water. The indirect effect of ozone on organic pollutants is non-selective. Hydroxyl radicals have extremely strong oxidizing properties (redox potential 2.8eV) and can react with a variety of organic matter in water to achieve the purpose of removing pollutants without secondary pollution.

[0008] Therefore, there is an urgent need to design an ozone advanced oxidation system for in-situ extraction treatment of groundwater to solve the current technical problems. Summary of the invention

[0009] The purpose of the present invention is to solve the above-mentioned technical problems and to provide an ozone advanced oxidation system for in-situ and extraction treatment of groundwater. The system has a reasonable structure and is easy to operate. It can flexibly switch between in-situ injection and extraction treatment methods according to different site conditions, thereby significantly improving the treatment efficiency of the ozone oxidation process.

[0010] In order to solve the above technical problems, the present invention provides an ozone advanced oxidation system for in-situ and extraction treatment of groundwater, comprising an ozone preparation device and an oxidation reaction device, wherein the ozone prepared by the ozone preparation device can be switched to be introduced into an injection well at the anti-backflow tank of the oxidation reaction device for ozone in-situ oxidation or introduced into an ozone reaction tower of the oxidation reaction device, the ozone reaction tower is filled with a catalyst filler, and under the catalysis of the catalyst, the ozone reacts with the sewage extracted to the ozone reaction tower to remove pollutants;

[0011] The ozone preparation device comprises an ozone generator, an air compressor, a cold dryer and an oxygen generator. The compressed air obtained by the air compressor is filtered in two stages, dried by the cold dryer and stored in a compressed air storage tank. The compressed air in the compressed air storage tank is sent to the oxygen generator. The adsorber of the oxygen generator adsorbs nitrogen and carbon dioxide, so that oxygen is enriched in the gas phase. The oxygen prepared by the oxygen generator is stored in an oxygen buffer tank. The oxygen in the oxygen buffer tank enters the ozone generator to produce ozone.

[0012] The oxidation reaction device includes a sewage inlet pump, a bag filter, and an ozone reaction tower. Groundwater enters a sewage regulating tank from a pumping well, and the effluent from the sewage regulating tank enters the ozone reaction tower through an inlet pump and a bag filter inlet pump. The ozone reaction tower is filled with catalyst fillers.

[0013] As a preferred embodiment, the ozone generator generates ozone by medium-frequency high-voltage discharge of oxygen prepared by the oxygen generator, and the discharge tube of the ozone generator is made of high-borosilicate quartz glass material.

[0014] As a preferred embodiment, the ozone preparation device further comprises a water chiller, a circulating cooling water jacket is arranged on the outer side of the discharge tube, and a pipeline of the circulating cooling water jacket is connected to the water chiller.

[0015] As a preferred embodiment, the ozone gas supply pipeline is arranged at the upper end of the anti-backflow tank, and the anti-backflow tank is equipped with a magnetic flap level gauge and a vent solenoid valve. The magnetic flap level gauge monitors the liquid level in the tank, and the vent solenoid valve automatically opens to discharge the stored water that reaches the set height.

[0016] As a preferred embodiment, the compressed air prepared by the air compressor of the ozone preparation device and the ozone are alternately introduced into the injection well to enhance the diffusion capacity of the ozone.

[0017] As a preferred embodiment, the oxidation reaction device further comprises a reagent box, in which the reagent is hydrogen peroxide, which can be switched and added to the ozone reaction tower or the injection well as required. Hydrogen peroxide can promote the generation of hydroxyl radicals to degrade organic matter into carbon dioxide and water.

[0018] As a preferred embodiment, there are multiple ozone reaction towers, which are arranged in series; a microporous aeration head is arranged inside the ozone reaction tower, and the microbubbles generated by the microporous aeration head can increase the mass transfer rate of ozone and enhance the oxidation capacity of ozone.

[0019] As a preferred embodiment, the filler filled in the ozone reaction tower is an ozone catalyst, which is selected according to the different pollutants to be removed and the reaction conditions. 2+ , Fe 3+ , Mn 2+ 、Ni 2+ , NiO or Al2O3, etc.

[0020] As a preferred embodiment, the oxidation reaction device further comprises an ozone destroyer connected to the ozone reaction tower. The ozone destroyer utilizes the catalyst MnO2 to heat at a high temperature of 105°C to destroy the unused ozone in the ozone reaction tower.

[0021] As a preferred embodiment, when the ozone produced by the ozone production device is passed through the anti-backflow tank of the oxidation reaction device into the injection well for in-situ ozone oxidation, the pressure of the outlet pipe of the ozone production device is set at 0.3MPa. Specifically, the pressure of the outlet pipe of the ozone generator is set at 0.3MPa through the interlocking effect of the pressure transmitter and the electric regulating valve to overcome the pressure loss of groundwater and soil during ozone injection.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention can switch between in-situ injection and extraction treatment according to different site conditions, is easy to operate, and significantly improves the efficiency of groundwater remediation by ozone oxidation process.

[0024] (2) To enhance the diffusion range of ozone, compressed air is alternately injected into the injection well to disturb the environment, and hydrogen peroxide is injected simultaneously to synergistically catalyze and enhance the efficiency, thereby accelerating the oxidation of pollutants in the groundwater by ozone, and achieving the best treatment effect.

[0025] (3) Ozone is passed through the anti-backflow tank into the ozone reaction tower, the water inlet pump is started, and the sewage passes through the bag filter and enters the three-stage reaction tower in series in turn; the ozone and sewage in the reaction tower are mixed and react under the catalysis of the catalyst to remove pollutants; the treated sewage flows out from the outlet of the 3# reaction tower into the outlet tank, and is recharged into the groundwater or discharged externally through the outlet pump; the ozone that has not been fully reacted in the reaction tower enters the ozone destructor from the top and is discharged into the atmosphere after meeting the standards.

[0026] (4) To prevent the catalyst from being blocked, three branches are connected from the compressed air storage tank of the ozone preparation device to each stage of the ozone reaction tower. Compressed air is introduced from the bottom of the reaction tower. A manual ball valve is installed on each branch, which can be adjusted according to the actual operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0028] Figure 1 It is a plan view of an ozone preparation device of an ozone advanced oxidation system for in-situ and extraction treatment of groundwater according to the present invention;

[0029] Figure 2 It is a plan view of an oxidation reaction device of an ozone advanced oxidation system for in-situ extraction treatment of groundwater according to the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0031] 1. Ozone generator; 2. Chiller; 3. Oxygen generator; 4. Air compressor; 5. Cold dryer; 6. Power distribution cabinet; 7. Anti-backflow tank; 8. Water inlet pump; 9. Bag filter; 10. 1# ozone reaction tower; 11. 2# ozone reaction tower; 12. 3# ozone reaction tower; 13. Outlet storage tank; 14. Outlet pump; 15. Chemical box; 16. Metering pump; 17. Ozone destroyer; 18. Electric control cabinet; 19. Ozone air inlet; 20. Water inlet; 21. Water outlet; 22. Ozone air outlet; 23. Compressed air outlet; 24. Compressed air inlet. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0033] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0034] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0035] The ozone advanced oxidation system for in-situ extraction treatment of groundwater described in the present application includes an ozone preparation device and an oxidation reaction device, and its schematic diagram is as follows: Figure 1 and Figure 2It includes an ozone preparation device and an oxidation reaction device. The ozone prepared by the ozone preparation device can be switched to be introduced into an injection well at the anti-backflow tank of the oxidation reaction device for in-situ ozone oxidation or introduced into an ozone reaction tower of the oxidation reaction device. The ozone reaction tower is filled with a catalyst filler. Under the catalysis of the catalyst, the ozone reacts with the sewage pumped into the ozone reaction tower to remove pollutants.

[0036] The ozone preparation device includes an ozone generator 1, an air compressor 4, a cold dryer 5, an oxygen generator 3 and a chiller 2. After the compressed air is filtered at two stages and dried by the cold dryer, nitrogen and carbon dioxide are adsorbed by the adsorber of the oxygen generator, so that oxygen is enriched in the gas phase. The oxygen prepared by the oxygen generator is stored in an oxygen buffer tank.

[0037] The device of the present invention uses a pressure swing adsorption (PSA) oxygen generator to prepare oxygen. The raw material used in the ozone preparation device is air. Under normal temperature conditions, the compressed air is filtered through a two-stage filter, dehydrated and dried by a cold dryer 5, and then enters the 1# adsorber. The PSA technology is used to make nitrogen, carbon dioxide and other impurities in the air adsorbed by the molecular sieve, and oxygen is enriched in the gas phase, flows out from the outlet of the oxygen generator and is stored in the oxygen buffer tank. When the adsorber runs to a certain extent and reaches a saturated state, the molecular sieve is rapidly depressurized to analyze the adsorbed components. The 1# adsorber and the 2# adsorber are operated alternately to obtain oxygen with a purity of about 90-94%.

[0038] Qualified gaseous oxygen enters the air inlet pipe of the ozone generator 1 after being filtered at 0.01μm level. Electric regulating valves and pressure transmitters are respectively set at the inlet and outlet pipes, and the pipe pressure is controlled at a given value. If the actual pressure is different from the given pressure, the regulator outputs a signal to adjust the valve opening. The outlet pipe pressure of the ozone generator 1 in the present invention is set to 0.3MPa to meet the requirements of in-situ injection. Compared with conventional ozone generators, the pressure is significantly increased, and the generator shell container adopts a pressure vessel design. The stabilized oxygen enters the ozone generating chamber, and the mature double-gap discharge method is used to generate ozone through medium-frequency (400-1,000Hz) high-voltage discharge in the ozone generating chamber. The discharge tube is the key to the ozone generator. The discharge tube of the device of the present invention is made of high borosilicate quartz glass, and the electrode is made of stainless steel 316. Because the reaction pressure increases, the discharge reaction elements are also optimized accordingly to improve the reliability of the long-term operation of the system.

[0039] The ozone generator 1 generates a large amount of heat energy when in operation. To ensure the safe operation of the system, the ozone generator 1 is provided with a circulating cooling water jacket on the outside of the discharge tube; the cooling water flows through the jacket to take away the heat generated by the ozone generator 1, so as to achieve the purpose of discharging the heat energy. In addition, the present invention is provided with a chiller 2, and the circulating water flows out through the chiller 2, and returns to the chiller 2 through the cooling water upper water pipe after exchanging heat energy, forming a circulation system. The circulating liquid is normally deionized water, and antifreeze can also be used to consider winter antifreeze.

[0040] Figure 2 In the illustrated embodiment, the oxidation reaction device further comprises a sewage inlet pump, a bag filter 9, an ozone reaction tower, an ozone destroyer 17 and a reagent box 15. Groundwater enters the sewage regulating tank from the pumping well, and sewage enters the ozone reaction tower through the inlet pump via the bag filter inlet pump. The ozone reaction tower is filled with catalyst fillers. Figure 2 Three ozone reaction towers are connected in series, namely, 1# ozone reaction tower 11, 2# ozone reaction tower 12 and 3# ozone reaction tower 13.

[0041] As an embodiment of the present invention, the technical solution corresponding to the groundwater extraction treatment is as follows: groundwater is extracted from the extraction well into the sewage regulating tank, and enters the three-stage ozone reaction tower through the water inlet pump 8. In order to intercept suspended matter in the sewage, a bag filter 9 with a filtration accuracy of 5μm is set after the pump. The ozone reaction tower is a cylindrical vertical structure, 3 stages are connected in series, and the carbon steel anti-corrosion material. A titanium steel microporous aeration head is correspondingly set in each reaction tower. The microbubbles can not only increase the mass transfer rate of ozone, but also enhance the oxidation capacity of ozone.

[0042] Ozone enters the ozone reaction tower through the air supply pipeline from the outlet of the ozone generator 1. In order to prevent polluted water from flowing back into the ozone generator, a gas-liquid separation anti-backflow tank 7 is set between the ozone generator 1 and the reaction tower, and is equipped with a magnetic flap level gauge and a venting solenoid valve. The air supply pipeline is set at the upper end of the anti-backflow tank. If sewage flows back during operation, it will flow back to the anti-backflow tank. The magnetic flap level gauge monitors the liquid level in the tank. When it reaches a certain height, the venting solenoid valve automatically opens to discharge the stored water. After passing through the anti-backflow tank, ozone enters the three reaction towers respectively, and is released from the aeration disk to contact with water. Because the microbubble particle size is small, the bubble rises slowly, exists for a long time, has a large impact range, and has a good mass transfer effect.

[0043] At the same time, the tower is filled with ozone catalysts. Ozone catalytic technology also uses a large number of hydroxyl radicals generated during the reaction process to oxidize and decompose organic matter in the water. The addition of catalysts can accelerate and strengthen the oxidation reaction. The three reaction towers are selected according to the removal of different pollutants and reaction conditions. 2+ , Fe 3+ , Mn 2+ 、Ni 2+, NiO or Al2O3 and other catalysts to achieve the best removal effect of pollutants.

[0044] The catalyst filling amount can be determined by a small test based on the water quality. In order to prevent the catalyst filler from being blocked, the present invention arranges three branches behind the compressed air storage tank of the ozone preparation device and connects them to each stage of the ozone reaction tower respectively. Compressed air is introduced from the bottom of the reaction tower for backwashing. A manual ball valve is configured on each branch, which can be regulated according to the actual operating conditions.

[0045] Due to the multiple influences of water quality and diffusion device, the ozone absorption rate in the reaction tower cannot reach 100%, so the device of the present invention adopts heating catalysis method to perform secondary treatment on the tail gas discharged from the reaction tower. Ozone can be decomposed within 2S at 350℃, but it will produce large energy consumption. The ozone destroyer is used to continuously heat the tail gas and use the catalyst MnO2 to enhance the decomposition effect. When the temperature reaches 105℃, the ozone structure can be destroyed, so that the tail gas can meet the discharge standard.

[0046] Furthermore, the effluent from the tertiary reaction tower enters the effluent storage tank 13, and then is discharged or pumped to the groundwater re-injection well by the effluent pump 14. The effluent storage tank is provided with a magnetic flap level gauge for low liquid level stop protection of the effluent pump and restarting the pump after the water level in the tank rises to a preset liquid level.

[0047] As another embodiment of the present invention, when performing ozone in-situ injection treatment, the technical solution is as follows: a separate pipeline is set behind the ozone backflow prevention tank and connected to each injection well respectively, and released into the saturated water zone through the aeration pipe in the injection well for diffusion. In order to better diffuse ozone in the soil and groundwater, the outlet pressure of the ozone generator is set at 0.3MPa through the interlocking action of the pressure transmitter and the electric regulating valve to overcome the pressure loss of groundwater and soil during ozone injection.

[0048] In order to make ozone diffuse evenly in the saturated water zone and ensure a certain influence radius, the present invention adopts the method of passing compressed air to the injection well. A branch is set on the rear side of the compressed air storage tank of the ozone preparation device to connect to the air supply pipeline behind the anti-backflow tank. Compressed air and ozone are injected alternately, and the diffusion range of ozone is enhanced by the disturbance of compressed air.

[0049] In the present invention, a reagent box 15 and a metering pump are arranged in the oxidation reaction device. The reagent in the reagent box is preferably hydrogen peroxide. Ozone and hydrogen peroxide are used in synergistic oxidation. The addition of hydrogen peroxide promotes the generation of hydroxyl radicals. Compared with a single ozone oxidation process, the final degradation products of organic matter are carbon dioxide and water, and the degradation rate can be significantly improved without causing secondary pollution.

[0050] Inlet pump In the present invention, the ozone preparation device is integrated into a separate container, and the oxidation reaction device is integrated onto a skid-mounted platform to improve the convenience of operation.

[0051] Compared with the shortcomings and deficiencies of the prior art, the present invention provides an ozone advanced oxidation system for in-situ and extraction treatment of groundwater, which has a reasonable structure and is easy to operate. It can flexibly switch between in-situ injection and extraction treatment methods according to different site conditions, thereby significantly improving the treatment efficiency of the ozone oxidation process for remediating groundwater pollution.

[0052] The present invention is not limited to the above-mentioned embodiments. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present invention.

Claims

1. An ozone advanced oxidation system for in-situ extraction treatment of groundwater, characterized in that: It includes an ozone preparation device and an oxidation reaction device. The ozone prepared by the ozone preparation device can be switched to be introduced into an injection well at the anti-backflow tank of the oxidation reaction device for in-situ ozone oxidation or introduced into an ozone reaction tower of the oxidation reaction device. The ozone reaction tower is filled with a catalyst filler. Under the catalysis of the catalyst, the ozone reacts with the sewage pumped into the ozone reaction tower to remove pollutants. The ozone preparation device includes an ozone generator, an air compressor, a cold dryer and an oxygen generator. The compressed air obtained by the air compressor is filtered in two stages, dried by the cold dryer and stored in a compressed air storage tank. The compressed air in the compressed air storage tank is sent to the oxygen generator, and the adsorber of the oxygen generator adsorbs nitrogen and carbon dioxide, so that oxygen is enriched in the gas phase. The oxygen prepared by the oxygen generator is stored in an oxygen buffer tank, and the oxygen in the oxygen buffer tank enters the ozone generator to produce ozone; The compressed air and ozone prepared by the air compressor of the ozone preparation device are alternately introduced into the injection well to enhance the diffusion capacity of the ozone; When the ozone prepared by the ozone preparation device is passed through the anti-backflow tank of the oxidation reaction device into the injection well for in-situ ozone oxidation, the pressure of the ozone preparation device outlet pipeline is set at 0.3MPa to overcome the pressure loss of groundwater and soil during ozone injection; The shell container of the ozone generator adopts a pressure vessel design, the discharge tube of the ozone generator is made of high borosilicate quartz glass, and the electrode is made of stainless steel 316.

2. The ozone advanced oxidation system according to claim 1, characterized in that: The oxidation reaction device comprises an inlet pump, a bag filter, and an ozone reaction tower. Groundwater enters a sewage regulating tank from a pumping well, and effluent from the sewage regulating tank enters the ozone reaction tower through the inlet pump and the bag filter. The ozone reaction tower is filled with catalyst fillers.

3. The ozone advanced oxidation system according to claim 2, characterized in that: The ozone generator generates ozone by discharging oxygen prepared by the oxygen generator through medium-frequency high-voltage discharge. The discharge tube of the ozone generator is made of high-borosilicate quartz glass material.

4. The ozone advanced oxidation system according to claim 3, characterized in that: The ozone preparation device also includes a water chiller. A circulating cooling water jacket is arranged on the outer side of the discharge tube. The pipeline of the circulating cooling water jacket is connected to the water chiller.

5. The ozone advanced oxidation system according to claim 1, 2 or 3, characterized in that: The ozone gas supply pipeline is set at the upper end of the anti-backflow tank. The anti-backflow tank is equipped with a magnetic flap level gauge and a vent solenoid valve. The magnetic flap level gauge monitors the liquid level in the tank, and the vent solenoid valve automatically opens to discharge the stored water that reaches the set height.

6. The ozone advanced oxidation system according to claim 1, 2 or 3, characterized in that: The oxidation reaction device also includes a reagent box, in which the reagent is hydrogen peroxide. The reagent can be switched and added to the ozone reaction tower or the injection well as required.

7. The ozone advanced oxidation system according to claim 1, 2 or 3, characterized in that: There are multiple ozone reaction towers, which are arranged in series; a microporous aeration head is arranged inside the ozone reaction tower, and the microbubbles generated by the microporous aeration head can increase the mass transfer rate of ozone and enhance the oxidation capacity of ozone.

8. The ozone advanced oxidation system according to claim 1, 2 or 3, characterized in that: The filler filled in the ozone reaction tower is an ozone catalyst, which is selected according to the different pollutants to be removed and the reaction conditions. 2+ , Fe 3+ , Mn 2+ 、Ni 2+ , NiO or Al2O3, etc.

9. The ozone advanced oxidation system according to claim 1, 2 or 3, characterized in that: The oxidation reaction device also includes an ozone destroyer, which is connected to the ozone reaction tower. The ozone destroyer utilizes the catalyst MnO2 to heat at a high temperature of 105° C. to destroy the unused ozone in the ozone reaction tower.

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