A treatment system for wastewater containing volatile organic pollutants

Abstract

The invention relates to a treatment system for wastewater containing volatile organic pollutants. The treatment system for wastewater containing volatile organic pollutants comprises a pre-treatment unit, a main reactor and a post-treatment unit which are connected in sequence. The water inlet at the bottom of the main reactor is connected to the pre-treatment unit, the water outlet at the top is connected to the post-treatment unit, and the gas outlet at the top and the reflux port at the top are both connected to a circulating dosing unit; the circulating dosing unit comprises an exhaust gas treatment device, a fan and at least one dosing tank, the gas outlet of the main reactor is connected to the exhaust gas treatment device, the fan and the dosing tank in sequence, and is used to extract gas in the main reactor and treat it through the exhaust gas treatment device, and the treated gas is used to stir a solution in the dosing tank; the reflux port of the main reactor is connected to the dosing tank, and is used to replenish the dosing tank with liquid; the outlet of the dosing tank is connected to the reagent inlet of the main reactor.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment system for wastewater containing volatile organic pollutants. Background Art

[0002] The rapid development of my country's industry has also brought about the generation of a large amount of organic wastewater. Among them, some volatile organic pollutants in wastewater are difficult to remove. These volatile organic pollutants mainly come from two sources: one is that volatile pollutants generated during industrial production enter the wastewater, and the other is that some intermediate products in the treatment process of organic wastewater are volatile. Volatile substances in wastewater will be released into the atmosphere, polluting the atmosphere, and at the same time causing harm to wastewater treatment operation and maintenance personnel, treatment facilities and surrounding residents.

[0003] At present, volatile organic wastewater is mainly treated by evaporation and concentration, and the concentrated liquid and distillate are treated separately. Patent 200410045343.6 discloses a volatile organic wastewater concentration treatment system, which heats volatile organic wastewater through an evaporator to obtain a distillate containing boiling point organic matter and concentrated high-boiling point organic wastewater. Among them, the low-boiling point distillate is discharged after being treated by a reverse osmosis filter, a photocatalyst decomposer, or ozone oxidation; and the concentrated liquid is treated by incineration or other methods.

[0004] Evaporation concentration technology cannot produce pure distilled water. Low-boiling-point organic matter will enter the distillate, which still requires cumbersome subsequent treatment processes. At the same time, some organic matter will corrode the evaporation reactor or cause scaling of the treatment equipment. The concentrated liquid after evaporation contains more volatile organic matter with a higher boiling point. Incineration heating treatment is generally used, and it is generally heated to above 730 or 800°C to decompose the organic matter, which consumes a lot of energy. Summary of the invention

[0005] In order to solve one of the above technical problems, the present invention provides a treatment system for wastewater containing volatile organic pollutants, which uses a main reactor capable of negative pressure aeration to carry out catalytic oxidation reaction. Under the condition that the oxidant and the wastewater are fully in contact, the undegraded volatile organic matter is removed from the wastewater, and then adsorbed by the waste gas treatment device. The treated exhaust gas can also be used to stir the solution in the reagent pool, thereby efficiently utilizing energy and improving the treatment effect.

[0006] The treatment system for wastewater containing volatile organic pollutants comprises a pre-treatment unit, a main reactor and a post-treatment unit which are connected in sequence, wherein the water inlet at the bottom of the main reactor is connected to the pre-treatment unit, the water outlet at the top is connected to the post-treatment unit, and the air outlet at the top and the reflux port at the top are both connected to the circulation dosing unit;

[0007] The circulating dosing unit includes an exhaust gas processor, a fan and at least one dosing tank. The gas outlet of the main reactor is connected to the exhaust gas processor, the fan and the dosing tank in sequence, and is used to extract the gas in the main reactor and process it through the exhaust gas processor. The treated gas is used to stir the solution in the dosing tank; the reflux port of the main reactor is connected to the dosing tank, and is used to replenish the dosing tank with liquid; the outlet of the dosing tank is connected to the reagent inlet of the main reactor.

[0008] Optionally, the pretreatment unit includes a water inlet pump, a pretreatment tank and a jet pump connected in sequence, and the outlet of the jet pump is connected to the water inlet of the main reactor;

[0009] The water inlet side of the pre-treatment tank is provided with a grid, the top is provided with an automatic scraper, the bottom is provided with a mud discharge port, the middle is provided with a drain port, and the drain port is connected to the inlet of the jet pump.

[0010] Optionally, the main reactor comprises a water inlet zone, a reaction zone and a water outlet zone from bottom to top, the water inlet zone is an inverted cone and has a water inlet and at least one reagent inlet at the bottom, and the water inlet zone is used to mix the wastewater with the reagent solution;

[0011] The reaction zone is provided with a water distribution plate, a fluidized carrier and a screen from bottom to top. The water distribution plate is provided with evenly distributed through holes, so that the mixed water in the water inlet area can enter the reaction zone evenly; the aperture of the screen is smaller than the particle size of the fluidized carrier, so as to intercept the fluidized carrier; the wastewater and the reagent react fully in the reaction zone to degrade organic matter;

[0012] The water outlet area is conical, which is conducive to gas collection. The water outlet area is provided with a water outlet weir, and both sides of the water outlet weir are respectively provided with a water outlet and a reflux outlet, and the top of the water outlet area is provided with an air outlet.

[0013] Further, optionally, a plurality of one-way air inlet valves are evenly arranged on the two side walls of the water inlet area. When the fan exhausts the main reactor through the air outlet, negative pressure is formed in the main reactor, and the external air enters the water inlet area through the one-way air inlet valve and mixes with the inlet water and the reagent. When passing through the water distribution plate, the inlet water and the inlet air are cut and dispersed to make the reagent and the wastewater fully contact. Each one-way air inlet valve is provided with its own control valve, so that the one-way air inlet valve can also be manually forced to be closed or opened.

[0014] Further optionally, a lining is provided in the water outlet area, and the lining is also conical, adapted to the shape of the inner wall of the water outlet area and arranged along the inner wall of the water outlet area, so as to protect the inner wall of the water outlet area from being corroded by the volatilized gas pollutants;

[0015] The top of the liner is provided with a first opening, and the conical side of the liner is evenly provided with 3-5 second openings, the heights of the second openings are the same, and the air outlet is connected in parallel with the first opening and the second opening through an air pipe with a valve.

[0016] Further optionally, the screen is made of a flexible material and can float naturally with the water flow.

[0017] Further optionally, a pH detection probe and an ORP detection probe are provided below the outlet weir and are connected to an external control device for real-time monitoring of the pH and ORP of the outlet water.

[0018] Further optionally, a cross-flow outlet and a cross-flow inlet are respectively provided on both sides of the middle of the reaction zone, and both the cross-flow outlet and the cross-flow inlet are provided with partitions for blocking the fluidized carrier; a cross-flow pipe is provided on the outside of the main reactor for connecting the cross-flow outlet and the cross-flow inlet, and the cross-flow channel is provided with a water pump for extracting the fluid in the reaction zone from the cross-flow outlet and then inputting it into the reaction zone from the cross-flow inlet.

[0019] Optionally, the circulating dosing unit includes an exhaust gas processor, a fan, an oxidant dosing tank and a catalyst dosing tank, the gas outlet of the main reactor is connected to the exhaust gas processor and the fan in sequence, and the outlet of the fan is connected to the bottom air inlets of the oxidant dosing tank and the catalyst dosing tank in parallel through an air pipe;

[0020] The reflux port is connected in parallel to the upper liquid inlets of the oxidant dosing tank and the catalyst dosing tank through a pipeline, and the lower liquid outlets of the oxidant dosing tank and the catalyst dosing tank are respectively connected to the two reagent inlets of the main reactor.

[0021] Optionally, the post-processing unit comprises a water outlet pump, a post-processing tank and a water production pump connected in sequence, the water outlet of the main reactor is connected to the post-processing tank through the water outlet pump, and the water production pump is used to discharge the produced water;

[0022] The post-treatment tank is also provided with a dosing box connected to a dosing pump for inputting treatment reagents into the post-treatment tank to further treat the effluent of the main reactor to ensure that the produced water meets the standards.

[0023] The beneficial effects of the processing system of the present invention are as follows:

[0024] 1. High treatment efficiency: The present invention generates negative pressure to allow air to pass through a one-way air inlet valve, and forms fine bubbles under the cutting of a porous water distribution plate and a fluidized carrier, thereby increasing the contact area between pollutants and treatment agents and gas-liquid phases. While the degradation reaction is more thorough, more volatile organic compounds are transferred from the water phase to the gas phase, making the removal of volatile organic compounds in wastewater more efficient and thorough;

[0025] 2. Energy saving and cost reduction: Compared with the traditional evaporation and concentration technology, the present invention does not require heating evaporation and high-temperature treatment of the concentrated liquid. The main energy consumption is the use of a fan to generate negative pressure aeration, and the air drawn out by the fan can also blow and stir the reagent, saving the energy consumption of the mixer in the reagent pool; and while achieving good treatment effects, it reduces operating energy consumption and costs;

[0026] 3. Wide application scope: The present invention mainly adopts chemical oxidation and physical adsorption (or photocatalytic oxidation) to remove volatile organic pollutants. After double treatment, almost all volatile organic compounds can be removed from water. The treatment of organic compounds is not selective, and single or complex organic polluted wastewater can be treated. The application scope is very wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic diagram of the structure of a treatment system for wastewater containing volatile organic pollutants;

[0028] Figure 2 is a schematic diagram of the structure of the cross-flow channel;

[0029] Figure 3 This is a schematic diagram of the structure of the lining of the water outlet area.

[0030] In the figure, pretreatment unit 1; water inlet pump 11; pretreatment tank 12; jet pump 13; main reactor 2; water inlet area 21; one-way air inlet valve 211; reaction area 22; water distribution plate 221; fluidized carrier 222; screen 223; pH detection probe 224; ORP detection probe 225; water outlet weir 226; cross-flow pipeline 227; water outlet area 23; liner 24; first opening 241; first Two openings-242; circulating dosing unit-3; exhaust gas processor-31; PID gas detector-311; fan-32; oxidant dosing tank-33; catalyst dosing tank-34; oxidant reflux water pump-35; oxidant jet pump-36; catalyst reflux water pump-37; catalyst jet pump-38; post-treatment unit-4; water outlet pump-41; post-treatment tank-42; dosing box-43; dosing pump-431; water production pump-44. DETAILED DESCRIPTION

[0031] This embodiment provides a system for treating wastewater containing volatile organic pollutants, such as Figure 1-Figure 3 As shown, it includes a pre-treatment unit 1, a main reactor 2 and a post-treatment unit 4 connected in sequence, the water inlet at the bottom of the main reactor 2 is connected to the pre-treatment unit 1, the water outlet at the top is connected to the post-treatment unit 4, and the air outlet at the top and the upper reflux port are both connected to the circulating dosing unit 3;

[0032] The circulating dosing unit 3 includes a waste gas processor 31, a fan 32 and at least one dosing tank. The gas outlet of the main reactor 2 is connected to the waste gas processor 31, the fan 32 and the dosing tank in sequence, and is used to extract the gas in the main reactor 2 and treat it through the waste gas processor 31. The treated gas is used to stir the solution in the dosing tank; the reflux port of the main reactor 2 is connected to the dosing tank, which is used to replenish the dosing tank with liquid; the outlet of the dosing tank is connected to the reagent inlet of the main reactor 2.

[0033] Optionally, the pretreatment unit 1 includes a water inlet pump 11, a pretreatment tank 12 and a jet pump 13 connected in sequence, and the outlet of the jet pump 13 is connected to the water inlet of the main reactor 2;

[0034] The water inlet side of the pre-treatment tank 12 is provided with a grid, the top is provided with an automatic scraper, the bottom is provided with a mud outlet, and the middle is provided with a drain outlet, which is connected to the inlet of the jet pump 13. The wastewater enters the pre-treatment tank 12 for filtration, oil removal and sand settling pretreatment, and the water volume and water quality can also be adjusted. The automatic scraper scrapes off the oil phase and scum on the top of the tank body, and the wastewater settles naturally in the tank. The solid impurities sink to the bottom and are discharged from the mud outlet, and the middle water phase is input into the main reactor 2. The automatic scraper can use the conventional scraper used in the flotation tank on the market.

[0035] In order to prevent the volatilization of pollutants, a top cover may be provided above the pretreatment tank 12 .

[0036] Optionally, the main reactor 2 includes a water inlet area 21, a reaction area 22 and a water outlet area 23 from bottom to top, the water inlet area 21 is an inverted cone and has a water inlet and at least one reagent inlet at the bottom, and the water inlet area 21 is used to mix the wastewater and the reagent solution;

[0037] The reaction zone 22 is provided with a water distribution plate 221, a fluidized carrier 222 and a screen 223 from bottom to top. The water distribution plate 221 is provided with evenly distributed through holes, so that the mixed water in the water inlet zone 21 can evenly enter the reaction zone 22; the aperture of the screen 223 is smaller than the particle size of the fluidized carrier 222, so as to intercept the fluidized carrier 222; the wastewater and the reagent fully react in the reaction zone 22 to degrade organic matter;

[0038] The water outlet area 23 is conical, which is conducive to gas collection. The water outlet area 23 is provided with a water outlet weir 226. The two sides of the water outlet weir 226 are respectively provided with a water outlet and a reflux port. The top of the water outlet area 23 is provided with a gas outlet. The main reactor 2 can degrade organic pollutants in the wastewater, and at the same time, the negative pressure formed by the exhaust of the fan 32 is used to transfer the undegraded volatile organic pollutants from the water phase to the gas phase.

[0039] Further optionally, a plurality of one-way air inlet valves 211 are evenly arranged on the two side walls of the water inlet area 21. When the fan 32 exhausts the main reactor 2 through the air outlet, a negative pressure is formed in the main reactor 2, and the external air enters the water inlet area 21 through the one-way air inlet valve 211 and mixes with the incoming water and the reagent. When passing through the water distribution plate 221, the incoming water and the incoming air are cut and dispersed, so that the reagent and the wastewater are fully in contact. Each one-way air inlet valve 211 is provided with its own control valve, so that the one-way air inlet valve 211 can also be manually forced to control closing or opening.

[0040] Further optionally, the water inlet area 21 and the reaction area 22 can be integrally formed or welded together, and the reaction area 22 and the water outlet area 23 can be detachably connected to facilitate inspection and maintenance.

[0041] Further optionally, a lining 24 is provided in the water outlet area 23, and the lining 24 is also conical, adapted to the shape of the inner wall of the water outlet area 23 and arranged along the inner wall of the water outlet area 23, so as to protect the inner wall of the water outlet area 23 from being corroded by the volatilized gas pollutants;

[0042] The top of the liner 24 is provided with a first opening 241, and the conical side of the liner 24 is evenly provided with 3-5 second openings 242, the heights of the second openings 242 are the same, and the gas outlet is connected in parallel with the first opening 241 and the second opening 242 through a gas pipe with a valve. The present invention provides the liner 24 in the water outlet area 23, which can prevent the top cover of the water outlet area 23 from being corroded by gas, and the water outlet area 23 is detachable, which is convenient for cleaning and replacing the liner 24. In addition, it is easier and more flexible to make structural improvements (such as opening holes) on the liner 24 than on the side wall of the main reactor 2, saving a lot of economic and time costs. Compared with only one first opening 241, a plurality of second openings 242 are provided on the side of the liner 24, so that the gas in the water zone 23 can be more evenly sucked out. When bias flow, dead zone or uneven distribution of the fluidized carrier 222 or accumulation at a certain place occurs in the reaction zone 22, resulting in poor water and air inlet from the water inlet zone 21 to the reaction zone 22, or other phenomena affecting the uniform flow of the fluid in the main reactor 2, opening or closing the second openings 242 in different directions can be accompanied by opening or closing the one-way air inlet valves 211 in different directions. In this way, the upper and lower openings cooperate to form an oblique aeration airflow in the main reactor 2, which can impact the accumulated carriers or adjust the uneven water flow.

[0043] For example, when a dead zone is formed in the upper right corner of the reaction zone 22 and the water flow there is blocked, the one-way air intake valve 211 on the right side wall of the water inlet zone 21 is temporarily closed, and the one-way air intake valve 211 on the left side wall is fully opened, forming an air intake that is tilted to the right. However, the water distribution plate 221 has a uniform effect on the water and air intake, so that the directionality of the oblique air intake is not particularly obvious. At this time, the second opening 242 on the right side of the liner 24 is opened, and at the same time, the second opening 242 on the left side of the liner 24 is temporarily closed, cooperating with the one-way air intake valve 211 on the left side wall of the water inlet zone 21 to strengthen the air flow and water flow that are tilted to the right in the reaction zone 22 and the water outlet zone 23, thereby dispersing the dead zone in the upper right corner of the reaction zone 22.

[0044] Further optionally, the screen 223 is made of a flexible material and can float naturally with the water flow. For example, the screen 223 can be similar to a rope net, so that the screen 223 can not only intercept the fluidized carrier 222, but also float with the water flow, and the fluidized carrier 222 on the screen 223 can be thrown off in time, thereby self-cleaning the screen 223 in real time.

[0045] Further optionally, the fluidized carrier 222 is quartz sand. Under the action of water flow, the quartz sand forms a fluidized state in the reaction zone 22, plays a role in mixing and stirring, and makes the reaction more complete.

[0046] Further optionally, a pH detection probe 224 and an ORP detection probe 225 are provided below the outlet weir 226 and are connected to an external control device for real-time monitoring of the pH and ORP of the outlet water.

[0047] Further optionally, a cross-flow outlet and a cross-flow inlet are respectively provided on both sides of the middle of the reaction zone 22, and both the cross-flow outlet and the cross-flow inlet are provided with a partition net for blocking the fluidized carrier 222; a cross-flow pipeline 227 is provided outside the main reactor 2 for connecting the cross-flow outlet and the cross-flow inlet, and a water pump is provided in the cross-flow channel for pumping the fluid in the reaction zone 22 out of the cross-flow outlet and then inputting the fluid into the reaction zone 22 from the cross-flow inlet. The cross-flow pipeline 227 surrounds the main reactor once or half a circle.

[0048] On the basis of the traditional fluidized bed, the above design can add a cross-flow channel in the reaction zone 22. The cross-flow can not only cooperate with the second opening 242 and the one-way air inlet valve 211 to disturb the water flow in the reaction zone 22, but the inventors also unexpectedly found that in the sewage treatment process, timely starting the cross-flow channel can improve the sewage treatment effect. The specific reason is not clear yet, but it may be related to the different fluid flow directions and their combined effects on gas, water, and fluidized carrier 222.

[0049] Optionally, the circulating dosing unit 3 includes an exhaust gas processor 31, a fan 32, an oxidant dosing tank 33 and a catalyst dosing tank 34, the gas outlet of the main reactor 2 is connected to the exhaust gas processor 31 and the fan 32 in sequence, and the outlet of the fan 32 is connected to the bottom air inlets of the oxidant dosing tank 33 and the catalyst dosing tank 34 in parallel through an air pipe;

[0050] The reflux port is connected in parallel to the upper liquid inlets of the oxidant dosing tank 33 and the catalyst dosing tank 34 through a pipeline, and the lower liquid outlets of the oxidant dosing tank 33 and the catalyst dosing tank 34 are connected to the two reagent inlets of the main reactor 2 respectively.

[0051] The main function of the circulating dosing unit 3 is to process the gas containing volatile organic compounds collected by the main reactor 2, and to utilize the treated gas and the reaction liquid refluxed from the main reactor 2. The fan 32 exhausts the main reactor 2 through the waste gas processor 31, forms a negative pressure in the main reactor 2, and aerates through the one-way air inlet valve 211 to promote the mixing of wastewater with the catalyst and the oxidant, saving energy while improving the treatment effect. The present invention cleverly utilizes the suction and air delivery functions of the fan 32 through the setting of a fan 32. By sucking the gas in the main reactor 2, the gas containing pollutants is recovered and a negative pressure is formed in the main reactor 2. The negative pressure is used as the power for aeration of the one-way air inlet valve 211, maintaining the air pressure safety while promoting the mixing of materials in the main reactor 2 and assisting in maintaining a good fluidized state. On the other hand, the fan 32 supplies gas to the dosing tank and uses the gas energy to promote the stirring and mixing of the reagents. If the gas still contains a small amount of pollutants, it can be returned to the main reactor 2 with the reagents to continue degradation treatment, thereby realizing closed-loop treatment of polluted gases without generating obvious or large amounts of tail gas.

[0052] Further optionally, an oxidant reflux water pump 35 is provided on the pipeline connected to the upper liquid inlet of the oxidant dosing tank 33, and an oxidant jet pump 3613 is provided on the pipeline connected to the lower liquid outlet of the oxidant dosing tank 33; a catalyst reflux water pump 37 is provided on the pipeline connected to the upper liquid inlet of the catalyst dosing tank 34, and a catalyst jet pump 3813 is provided on the pipeline connected to the lower liquid outlet of the catalyst dosing tank 34.

[0053] The oxidant dosing tank 33 and the catalyst dosing tank 34 may be provided with vents, or the dosing tanks may not be sealed to avoid excessive pressure in the dosing tanks. A stirrer may be provided inside the oxidant dosing tank 33 and the catalyst dosing tank 34 to enhance the stirring effect.

[0054] The oxidant can be sodium persulfate or hydrogen peroxide, and the catalyst can be ferroferric oxide or ferrous sulfate. The oxidant and the catalyst are added to their respective dosing tanks in advance, and can be added to the clean water to prepare the solution or suspension. After the main reactor 2 is started, the water outlet area 23 will overflow the treated water body, which contains a small amount of oxidant and catalyst, and is input into each dosing tank through the reflux port, which not only saves the water used to prepare the reagents, but also makes full use of the reagents.

[0055] The waste gas processor 31 can treat volatile organic compounds in the waste gas in a common manner in the art, such as activated carbon adsorption and photocatalytic oxidation. The waste gas processor 31 can also be equipped with facilities and reagents required by the corresponding treatment method. Further optionally, a PID gas detector 311 and a gas branch pipe with a valve are provided on the pipeline connected to the gas outlet of the waste gas processor 31. The gas branch pipe is connected to the gas inlet of the waste gas processor 31. The PID gas detector 311 is used to monitor the content of volatile organic compounds in the gas after passing through the waste gas processor 31 in real time. When the content exceeds the standard, the gas branch pipe sends the gas back to the waste gas processor 31 for further treatment.

[0056] Optionally, the post-processing unit 4 includes a water outlet pump 41, a post-processing tank 42 and a water production pump 44 connected in sequence, the water outlet of the main reactor 2 is connected to the post-processing tank 42 through the water outlet pump 41, and the water production pump 44 is used to discharge the produced water;

[0057] The post-treatment tank 42 is also provided with a dosing box 43 connected to the dosing pump 431 for inputting treatment reagents into the post-treatment tank 42 to further treat the effluent of the main reactor 2 to ensure that the produced water meets the standards.

[0058] The dosing box 43 may contain coagulants or flocculants commonly used in the market.

Claims

1. A system for treating wastewater containing volatile organic pollutants, characterized in that: The treatment system for wastewater containing volatile organic pollutants comprises a pre-treatment unit, a main reactor and a post-treatment unit which are connected in sequence, wherein the water inlet at the bottom of the main reactor is connected to the pre-treatment unit, the water outlet at the top is connected to the post-treatment unit, and the air outlet at the top and the reflux port at the top are both connected to the circulation dosing unit; The circulating dosing unit includes an exhaust gas processor, a blower, an oxidant dosing tank and a catalyst dosing tank. The gas outlet of the main reactor is connected to the exhaust gas processor, the blower and the dosing tank in sequence, and is used to extract the gas in the main reactor and process it through the exhaust gas processor. The treated gas is used to stir the solution in the dosing tank; the reflux port of the main reactor is connected to the dosing tank, and is used to replenish the dosing tank with liquid; The main reactor includes a water inlet area, a reaction area and a water outlet area from bottom to top. The water inlet area is an inverted cone and has a water inlet and at least one reagent inlet at the bottom. The water inlet area is used to mix wastewater and reagent solution. The reaction zone is provided with a water distribution plate, a fluidized carrier and a screen from bottom to top. The water distribution plate is provided with evenly distributed through holes, so that the mixed water in the water inlet area can enter the reaction zone evenly; the aperture of the screen is smaller than the particle size of the fluidized carrier, so as to intercept the fluidized carrier; the wastewater and the reagent react fully in the reaction zone to degrade organic matter; The water outlet area is conical, which is conducive to gas collection. The water outlet area is provided with a water outlet weir, and the two sides of the water outlet weir are respectively provided with a water outlet and a return outlet, and the top of the water outlet area is provided with a gas outlet; A number of one-way air inlet valves are evenly arranged on the two side walls of the water inlet area. When the fan exhausts air from the main reactor through the air outlet, negative pressure is formed in the main reactor. External air enters the water inlet area through the one-way air inlet valve and mixes with the incoming water and reagent. When passing through the water distribution plate, the incoming water and air are cut and dispersed to make the reagent and wastewater fully contact. Each one-way air intake valve is equipped with its own control valve, so that the one-way air intake valve can be manually forced to close or open; A lining is provided in the water outlet area, and the lining is conical, adapted to the shape of the inner wall of the water outlet area and arranged along the inner wall of the water outlet area, so as to protect the inner wall of the water outlet area from being corroded by volatilized gas pollutants; The top of the liner is provided with a first opening, and the conical side of the liner is evenly provided with 3-5 second openings, the heights of the second openings are the same, and the air outlet is connected in parallel with the first opening and the second opening through an air pipe with a valve; The outlet of the fan is connected in parallel to the bottom air inlets of the oxidant dosing tank and the catalyst dosing tank through an air pipe; The reflux port is connected in parallel to the upper liquid inlets of the oxidant dosing tank and the catalyst dosing tank through a pipeline, and the lower liquid outlets of the oxidant dosing tank and the catalyst dosing tank are respectively connected to the two reagent inlets of the main reactor.

2. The processing system according to claim 1, characterized in that The pretreatment unit comprises a water inlet pump, a pretreatment tank and a jet pump connected in sequence, and the outlet of the jet pump is connected to the water inlet of the main reactor; The water inlet side of the pre-treatment tank is provided with a grid, the top is provided with an automatic scraper, the bottom is provided with a mud discharge port, the middle is provided with a drain port, and the drain port is connected to the inlet of the jet pump.

3. The processing system according to claim 1, characterized in that The screen is made of flexible material and can float naturally with the water flow.

4. The processing system according to claim 1, characterized in that A pH detection probe and an ORP detection probe are arranged below the water outlet weir.

5. The processing system according to claim 1, characterized in that A cross-flow outlet and a cross-flow inlet are respectively provided on both sides of the middle of the reaction zone, and both the cross-flow outlet and the cross-flow inlet are provided with partitions for blocking the fluidized carrier; a cross-flow pipeline is provided on the outside of the main reactor for connecting the cross-flow outlet and the cross-flow inlet, and the cross-flow pipeline is provided with a water pump for extracting the fluid in the reaction zone from the cross-flow outlet and then inputting it into the reaction zone from the cross-flow inlet.

6. The processing system according to claim 1, characterized in that The post-processing unit comprises a water outlet pump, a post-processing tank and a water production pump connected in sequence, the water outlet of the main reactor is connected to the post-processing tank through the water outlet pump, and the water production pump is used to discharge the produced water; The post-treatment tank is also provided with a dosing box connected by a dosing pump, which is used to input treatment reagents into the post-treatment tank to further treat the effluent from the main reactor to ensure that the produced water meets the standards.

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