Method for treating high-concentration organic wastewater and device therefor

Abstract

The application discloses a high-concentration organic wastewater treatment method and device, relates to the treatment technology of high-concentration organic wastewater, and realizes the coupling of micro-electrolysis, Fenton oxidation, ozone catalytic oxidation and micro-flocculation filtration technologies through multiple steps such as water supply, micro-electrolysis treatment, Fenton reaction and three-stage sedimentation filtration, so that the reaction processes are complementary and synergistic, the treatment efficiency is improved, and the equipment and reagent input are reduced; and the application further discloses a treatment device for realizing the above method, mainly comprising a water supply device, a micro-electrolysis cell, a Fenton reactor and a three-stage sedimentation filtration device. The application has the advantages of high treatment efficiency, convenient operation, low operation cost, good industrial application prospect and efficient treatment of high-concentration organic wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and particularly to a technology for treating high-concentration organic wastewater. Background Technology

[0002] High-concentration organic wastewater has long been a recognized technical challenge in wastewater treatment, primarily originating from industries such as coking, electroplating, pharmaceuticals, printing and dyeing, leather, and papermaking. This wastewater exhibits high concentrations of organic matter, with COD values ​​exceeding 2000 mg / L; it is also difficult to biodegrade, with a BOD5 / COD ratio below 0.3, indicating poor biodegradability. Due to its complex composition, high organic matter concentration, and strong toxicity, single physical, chemical, or biological methods are insufficient to achieve satisfactory treatment results. Therefore, a combination of various process methods is necessary for synergistic effects to meet discharge standards.

[0003] Advanced oxidation methods (such as electrolytic oxidation, Fenton oxidation, ozone oxidation, ultrasonic oxidation, photocatalytic oxidation, wet oxidation, etc.) have become the most ideal technology for treating high-concentration organic wastewater due to their advantages such as strong oxidation capacity, high treatment efficiency, fast reaction speed, and easy control.

[0004] Currently, there are reports on the use of a combination of advanced oxidation processes or in combination with other processes to treat high-concentration organic wastewater. For example, the invention patent "A device and method for purifying organic wastewater by nano-aeration iron-carbon micro-electrolysis" (Chinese Patent No.: CN 104230096 B) discloses a device and method for treating organic wastewater by combining a micro-electrolysis cell, an aerobic biofilm reactor, a flocculation device, and a backwash filtration device.

[0005] The invention patent "Integrated Toxic and Recalcitrant Wastewater Treatment Device and Method" (Chinese Patent No.: CN111908722 A) discloses a device and method for treating toxic and recalcitrant wastewater by combining an equalization tank, a primary micro-electrolysis reactor, a secondary Fenton reactor, a tertiary micro-electrolysis reactor, a coagulation sedimentation tank, and a biochemical reaction tank.

[0006] Existing technologies are limited in their widespread adoption due to either cumbersome and lengthy process combinations, large equipment footprint, and complex operation; or they suffer from problems such as easy packing material caking, low reagent utilization, and low reaction efficiency, resulting in unsatisfactory treatment effects on certain suspended solids and high-color organic wastewater (such as dyeing and printing wastewater). Therefore, it is urgent to develop a high-concentration organic wastewater treatment method and device that is highly efficient, low-cost, and easy to operate. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a device and method for efficiently treating high-concentration organic wastewater that integrates micro-electrolysis oxidation, Fenton oxidation, ozone catalytic oxidation and micro-flocculation filtration technologies.

[0008] To solve the above-mentioned technical problems, the technical concept of the present invention is as follows:

[0009] By coupling micro-electrolysis, Fenton reaction, and three-stage sedimentation filtration technologies through multiple steps such as water supply, micro-electrolysis, Fenton oxidation, ozone catalytic oxidation, and micro-flocculation filtration, the various reaction processes complement each other and synergistically enhance each other, thereby improving treatment efficiency and reducing equipment and reagent input. The high-concentration organic wastewater treatment device includes a water supply device, a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation filtration device to realize the aforementioned wastewater treatment method.

[0010] Specifically, by optimizing the design of the process flow, a coupled technology of micro-electrolysis oxidation, Fenton oxidation, and ozone catalytic oxidation is formed, enabling multiple oxidation technologies to complement each other and achieve synergistic effects, reducing the amount of reagents used, and achieving efficient removal of recalcitrant organic matter. This is further enhanced by combining micro-flocculation filtration technology to remove ammonia nitrogen and Fe. 2+ Fe 3+ And other impurities, ultimately achieving deep treatment of high-concentration organic wastewater.

[0011] By designing a multi-level packing layer track structure for the micro-electrolysis cell, the filtration channel is extended, improving space utilization and filtration efficiency. It also avoids packing loss and solves the problems of packing passivation and caking.

[0012] By adding a micro-nano ozone (O3) aerator, the efficiency of the Fenton reaction is enhanced and the energy consumption of the reaction is reduced.

[0013] By adding an internal circulation pipeline, the efficiency of the Fenton reaction and the utilization rate of the reagents can be improved.

[0014] By adding a three-stage sedimentation filtration device, the filtration accuracy is improved. The design of adding inclined plate sedimentation in the filtration device can not only extend the filtration channel, but also accelerate the sedimentation rate of particulate matter, so as to exert multiple functions such as micro-flocculation, filtration, adsorption, interception and sedimentation.

[0015] The overall process flow of this invention is complementary and mutually supportive, resulting in high treatment efficiency, wide applicability, simple equipment structure, and low operating costs. Compared with existing processes, it has significant technical advantages and is very suitable for the efficient and in-depth treatment of high-concentration organic wastewater.

[0016] To solve the above-mentioned technical problems, the technical solution of the present invention is described below.

[0017] The present invention provides a method for treating high-concentration organic wastewater using the following technical solution:

[0018] A method for treating high-concentration organic wastewater, wherein the high-concentration organic wastewater treatment device used in the wastewater treatment method includes a water supply device, which is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0019] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0020] Alternatively, the interior of the multi-stage packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0021] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0022] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0023] In the aforementioned micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0024] It has the following steps:

[0025] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0026] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 before entering the micro-electrolysis cell.

[0027] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater.

[0028] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined first baffle to the multi-stage packing layer track.

[0029] The multi-stage packing layer contains multiple iron-carbon packing materials that are spaced apart from each other and fixed by a filter steel mesh.

[0030] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0031] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0032] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0033] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubbles of ozone (O3), which are then introduced into the Fenton reactor through the air distribution holes.

[0034] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again.

[0035] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow. Then, it enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0036] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0037] Wastewater enters the inlet of the three-stage sedimentation and filtration device, is filtered by the packing material filled in the first reaction zone, and then enters the next reaction zone through the water distribution holes on the filter plate. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite.

[0038] After being treated by the three-stage sedimentation and filtration device, the wastewater that meets the standards overflows through the outlet pipe of the three-stage sedimentation and filtration device; the wastewater that does not meet the standards returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device.

[0039] A method for treating high-concentration organic wastewater, wherein the high-concentration organic wastewater treatment device used in the wastewater treatment method includes a water supply device, which is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0040] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0041] Alternatively, the interior of the multi-stage packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0042] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0043] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0044] In the aforementioned micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0045] It has the following steps:

[0046] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0047] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 before entering the micro-electrolysis cell.

[0048] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater.

[0049] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track;

[0050] The multi-stage packing layer contains multiple iron-carbon packing materials that are spaced apart from each other and fixed by a filter steel mesh.

[0051] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0052] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0053] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0054] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubbles of ozone (O3), which are then introduced into the Fenton reactor through the air distribution holes.

[0055] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again.

[0056] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0057] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0058] Wastewater enters the inlet of the three-stage sedimentation and filtration device, is filtered by the packing material filled in the first reaction zone, and then enters the next reaction zone through the water distribution holes on the filter plate. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite.

[0059] After the wastewater is treated by the three-stage sedimentation and filtration device, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device for recirculation.

[0060] Furthermore, in step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

[0061] A method for treating high-concentration organic wastewater, wherein the high-concentration organic wastewater treatment device used in the wastewater treatment method includes a water supply device, which is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0062] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0063] Alternatively, the interior of the multi-stage packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0064] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0065] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0066] In the aforementioned micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0067] It has the following steps:

[0068] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0069] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 before entering the micro-electrolysis cell.

[0070] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater.

[0071] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined first baffle to the multi-stage packing layer track.

[0072] The multi-stage packing layer contains multiple iron-carbon packing materials that are spaced apart from each other and fixed by a filter steel mesh.

[0073] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0074] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0075] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0076] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubbles of ozone (O3), which are then introduced into the Fenton reactor through the air distribution holes.

[0077] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again.

[0078] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0079] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0080] Wastewater enters the inlet of the three-stage sedimentation and filtration device, is filtered by the packing material filled in the first reaction zone, and then enters the next reaction zone through the water distribution holes on the filter plate. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite.

[0081] After the wastewater is treated by the three-stage sedimentation and filtration device, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device for recirculation.

[0082] In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

[0083] Furthermore, in step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0.

[0084] A method for treating high-concentration organic wastewater, wherein the high-concentration organic wastewater treatment device used in the wastewater treatment method includes a water supply device, which is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0085] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0086] Alternatively, the interior of the multi-stage packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0087] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0088] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0089] In the aforementioned micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0090] It has the following steps:

[0091] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0092] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 before entering the micro-electrolysis cell.

[0093] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater.

[0094] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined first baffle to the multi-stage packing layer track.

[0095] The multi-stage packing layer contains multiple iron-carbon packing materials that are spaced apart from each other and fixed by a filter steel mesh.

[0096] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0097] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0098] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0099] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubbles of ozone (O3), which are then introduced into the Fenton reactor through the air distribution holes.

[0100] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again.

[0101] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0102] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0103] Wastewater enters the inlet of the three-stage sedimentation and filtration device, is filtered by the packing material filled in the first reaction zone, and then enters the next reaction zone through the water distribution holes on the filter plate. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite.

[0104] After the wastewater is treated by the three-stage sedimentation and filtration device, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device for recirculation.

[0105] In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

[0106] In step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0;

[0107] Furthermore, in step ③, the hydraulic retention time of the wastewater in the Fenton reactor is 20-60 minutes.

[0108] In step ④, the hydraulic retention time of the wastewater in the three-stage sedimentation and filtration device is 20-60 minutes.

[0109] A method for treating high-concentration organic wastewater, wherein the high-concentration organic wastewater treatment device used in the wastewater treatment method includes a water supply device, which is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0110] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0111] Alternatively, the interior of the multi-stage packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0112] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0113] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0114] In the aforementioned micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0115] It has the following steps:

[0116] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0117] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 before entering the micro-electrolysis cell.

[0118] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater.

[0119] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined first baffle to the multi-stage packing layer track.

[0120] The multi-stage packing layer contains multiple iron-carbon packing materials that are spaced apart from each other and fixed by a filter steel mesh.

[0121] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0122] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0123] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0124] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubbles of ozone (O3), which are then introduced into the Fenton reactor through the air distribution holes.

[0125] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again.

[0126] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0127] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0128] Wastewater enters the inlet of the three-stage sedimentation and filtration device, is filtered by the packing material filled in the first reaction zone, and then enters the next reaction zone through the water distribution holes on the filter plate (402). It passes through three stages of filtration from top to bottom: anthracite, quartz sand and modified zeolite.

[0129] After the wastewater is treated by the three-stage sedimentation and filtration device, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device for recirculation.

[0130] In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

[0131] In step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0;

[0132] In step ③, the hydraulic retention time of the wastewater in the Fenton reactor is 20-60 minutes.

[0133] In step ④, the hydraulic retention time of the wastewater in the three-stage sedimentation and filtration device is 20-60 minutes.

[0134] Furthermore, in step ③, the ratio of the air volume of the micro-nano aerator to the water volume of the Fenton reactor is 2:1-6:1.

[0135] In step ③, the mass concentration ratio of hydrogen peroxide (H2O2) added by the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline of the Fenton reactor to the COD of the wastewater is 1:1-3:1.

[0136] In step ③, the flow rate ratio of the internal circulation reflux of the Fenton reactor to the influent flow rate of the Fenton reactor is 1:5 to 1:3.

[0137] The present invention provides a high-concentration organic wastewater treatment device, which is achieved by the following technical solution:

[0138] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device, wherein:

[0139] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0140] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0141] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0142] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates; each reaction zone has multiple parallel inclined second baffles; the fillers in the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0143] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device, wherein:

[0144] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0145] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0146] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0147] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates; each reaction zone has multiple parallel inclined second baffles; the fillers in the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0148] Furthermore, the sulfuric acid (H2SO4) dosing device in the water supply device is connected to a pipeline mixer at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and a booster pump at the other end.

[0149] The micro-electrolysis cell has a micro-electrolysis cell inlet at the top, which is connected to a multi-stage packing layer track, and a sludge discharge port at the bottom.

[0150] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device, wherein:

[0151] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0152] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0153] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0154] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates; each reaction zone has multiple parallel inclined second baffles; the fillers in the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0155] The sulfuric acid (H2SO4) dosing device in the water supply device is connected to a pipeline mixer at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and a booster pump at the other end.

[0156] The micro-electrolysis cell is provided with a micro-electrolysis cell inlet at the top, which is connected to a multi-stage packing layer track, and a sludge discharge port at the bottom.

[0157] Furthermore, the micro-electrolysis cell has a multi-level packing layer track consisting of 3, 4, or 5 parallel and staggered tracks, used to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material wrapped and fixed by a filter steel mesh.

[0158] The Fenton reactor is equipped with a micro-nano aerator at the bottom. The micro-nano bubbles generated by the micro-nano aerator are sent into the Fenton reactor through the air distribution holes at the bottom of the Fenton reactor.

[0159] The Fenton reactor is equipped with an internal circulation pump and valves in the internal circulation pipeline for regulating the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device in the internal circulation pipeline.

[0160] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device, wherein:

[0161] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0162] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0163] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0164] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates; each reaction zone has multiple parallel inclined second baffles; the fillers in the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0165] The sulfuric acid (H2SO4) dosing device in the water supply device is connected to a pipeline mixer at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and a booster pump at the other end.

[0166] The micro-electrolysis cell is provided with a micro-electrolysis cell inlet at the top, which is connected to a multi-stage packing layer track, and a sludge discharge port at the bottom.

[0167] The micro-electrolysis cell has a multi-level packing layer track consisting of 3, 4, or 5 parallel and staggered tracks to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0168] The Fenton reactor is equipped with a micro-nano aerator at the bottom. The micro-nano bubbles generated by the micro-nano aerator are sent into the Fenton reactor through the air distribution holes at the bottom of the Fenton reactor.

[0169] The Fenton reactor is equipped with an internal circulation pump and valves in the internal circulation pipeline for regulating the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device in the internal circulation pipeline.

[0170] Furthermore, the Fenton reactor has an internal circulation pipeline located outside the Fenton reactor; the upper end of the internal circulation pipeline is connected to the upper part of the Fenton reactor, and the lower end is connected to the internal circulation inlet at the bottom of the Fenton reactor.

[0171] The three-stage sedimentation and filtration device has an inlet at the top, an outlet at the bottom, and a return pipe with a valve on the return pipe.

[0172] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device, wherein:

[0173] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0174] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles. The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing. The bottom of the micro-electrolysis cell is provided with a micro-electrolysis cell outlet, which is connected to the Fenton reactor.

[0175] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0176] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates; each reaction zone has multiple parallel inclined second baffles; the fillers in the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0177] The water supply device has a sulfuric acid (H2SO4) dosing device with a booster pump at one end and a pipeline mixer at the other end, which is used to quickly and evenly mix wastewater with sulfuric acid (H2SO4).

[0178] The micro-electrolysis cell is provided with a micro-electrolysis cell inlet at the top, which is connected to a multi-stage packing layer track, and a sludge discharge port at the bottom;

[0179] The micro-electrolysis cell has a multi-level packing layer track consisting of 3, 4, or 5 parallel and staggered tracks to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material that is wrapped and fixed by a filter steel mesh.

[0180] The Fenton reactor is equipped with a micro-nano aerator at the bottom, and the micro-nano bubbles (302) generated by the micro-nano aerator are sent into the Fenton reactor through the air distribution holes at the bottom of the Fenton reactor.

[0181] The Fenton reactor is equipped with an internal circulation pump and valves in the internal circulation pipeline for regulating the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device in the internal circulation pipeline.

[0182] The Fenton reactor has an internal circulation pipeline located outside the reactor; the upper end of the internal circulation pipeline is connected to the upper part of the Fenton reactor, and the lower end is connected to the internal circulation inlet at the bottom of the Fenton reactor.

[0183] The three-stage sedimentation and filtration device is provided with an inlet at the top, an outlet at the bottom, and a return pipe with a valve on the return pipe.

[0184] Furthermore, in the micro-electrolysis cell, the tilt angle between the inclined first baffle and the horizontal line is 30°-45°, and the highest point of the first baffle is lower than the water inlet of the micro-electrolysis cell.

[0185] In the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell;

[0186] In the micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region.

[0187] The Fenton reactor described above uses ozone (O3) as the air intake for the aeration head of the micro-nano aerator to generate micro-nano bubble ozone (O3) and enhance the generation of hydroxyl radicals (·OH) during the Fenton reaction.

[0188] The three-stage sedimentation filtration device has an inclined second baffle with an angle of 60°-75° to the horizontal line;

[0189] In the aforementioned three-stage sedimentation filtration device, the particle size of the three types of packing materials decreases sequentially from top to bottom: anthracite has a particle size of 1.2-1.5 mm, quartz sand has a particle size of 0.8-1.0 mm, and modified zeolite has a particle size of 0.4-0.6 mm, with a uniformity coefficient of 2 for each.

[0190] Alternatively, the present invention provides a method for treating high-concentration organic wastewater using the following technical solution:

[0191] A method for treating high-concentration organic wastewater includes the following steps:

[0192] ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment;

[0193] High-concentration organic wastewater enters the inlet pipeline via a booster pump, where it is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device through a pipeline mixer. The pH value is adjusted to 2.0-3.0 (or 2.0-2.3 or 2.3-2.6 or 2.6-3.0), and then enters the micro-electrolysis cell.

[0194] ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where a micro-electrolysis reaction occurs through the iron-carbon packing material inside. This breaks down and opens the chains of large chain and ring-shaped organic molecules in the wastewater, decomposing them into easily biodegradable small-molecule organic molecules. This process degrades the organic matter in the wastewater and kills the microorganisms within it.

[0195] Wastewater from the preceding steps enters through the inlet of the micro-electrolysis cell and flows by gravity along the inclined baffle to the multi-stage packing layer track. The multi-stage packing layer track structure can extend the filtration channel, improve space utilization and filtration efficiency.

[0196] The multi-stage packing layer contains multiple iron-carbon packings that are spaced apart and fixed by a filter steel mesh. The structure design of the iron-carbon packings being fixed by the filter steel mesh can prevent the packings from being lost with the water flow and clogging the equipment and pipelines. In addition, the structure design of the spacing between any two adjacent iron-carbon packing areas can reduce the filtration resistance, increase the water permeability rate, and also prevent the packings from becoming passivated and caking.

[0197] The micro-electrolysis cell is equipped with a sludge discharge port at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor.

[0198] ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater;

[0199] The wastewater from the previous steps enters the Fenton reactor, where it, together with the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline, forms the Fenton oxidation system.

[0200] The micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubble ozone (O3), which is then introduced into the Fenton reactor through air distribution holes. The strong oxidizing properties of ozone (O3) can oxidize not only inorganic substances in wastewater but also recalcitrant organic matter. Furthermore, the catalytic oxidation of ozone (O3) can synergistically work with the Fenton oxidation reaction, generating more hydroxyl radicals (·OH), thereby enhancing the degradation process of organic matter by the Fenton reaction. In addition, the micro-nano bubble ozone (O3) can also intensify the turbulence of the wastewater, acting as a mixing agent.

[0201] The internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter the Fenton reactor with the action of the internal circulation pump, mix with the influent and treat it again. The internal circulation pipeline can not only intensify the swirling motion of the wastewater in the Fenton reactor and improve the efficiency of the Fenton reaction, but also allow ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) to be reused, thereby improving the utilization rate of the reagents.

[0202] The wastewater treated by the Fenton reactor overflows to the outlet of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device under the action of the hydraulic pump.

[0203] ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater.

[0204] Wastewater enters the inlet of the three-stage sedimentation and filtration device. After being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes on the filter plate (402). From top to bottom, it passes through three stages of filtration: anthracite, quartz sand, and modified zeolite, completing the micro-flocculation, filtration, adsorption, interception, and sedimentation process of the wastewater, effectively removing suspended solids, ammonia nitrogen, and Fe from the wastewater. 2+ Fe 3+ To remove other impurities, achieving the purpose of deep wastewater treatment;

[0205] After being treated by the three-stage sedimentation and filtration device, the wastewater that meets the standards overflows through the outlet pipe of the three-stage sedimentation and filtration device; the wastewater that does not meet the standards returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device.

[0206] The present invention provides a method for treating high-concentration organic wastewater, which can also be implemented using the following technical solutions:

[0207] Furthermore, in step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

[0208] Furthermore, in step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0.

[0209] Furthermore, in step ③, the hydraulic retention time of the wastewater in the Fenton reactor is 20-60 minutes.

[0210] Furthermore, in step ③, the ratio of the air volume of the micro-nano aerator to the water volume of the Fenton reactor is 2:1 to 6:1.

[0211] Furthermore, in step ③, the mass concentration ratio of hydrogen peroxide (H2O2) added by the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline of the Fenton reactor to the COD of the wastewater is 1:1-3:1.

[0212] Furthermore, in step ③, the flow rate ratio of the internal circulation reflux of the Fenton reactor to the influent flow rate of the Fenton reactor is 1:5 to 1:3.

[0213] Furthermore, in step ④, the hydraulic retention time of the wastewater in the three-stage sedimentation and filtration device is 20-60 minutes.

[0214] This invention discloses a high-concentration organic wastewater treatment device, which is implemented using the following technical solution:

[0215] A high-concentration organic wastewater treatment device, used in any of the aforementioned high-concentration organic wastewater treatment methods, includes a water supply device, wherein the water supply device is sequentially connected to a micro-electrolysis cell, a Fenton reactor, and a three-stage sedimentation and filtration device.

[0216] The water supply device is equipped with a sulfuric acid (H2SO4) dosing device, which is used to adjust the pH value of high-concentration organic wastewater before sending it into the micro-electrolysis cell.

[0217] The micro-electrolysis cell is equipped with a multi-stage packing layer track, which includes multiple parallel inclined baffles. The outlets on both sides of the baffles are staggered, and a packing layer is provided between adjacent baffles. The packing layer is filled with iron-carbon packing material, which is used to break and open the chains and rings of large chain and cyclic organic molecules in the micro-electrolysis reaction, decomposing them into easily biodegradable small organic molecules. The bottom of the micro-electrolysis cell is equipped with a micro-electrolysis cell outlet, which is connected to a Fenton reactor.

[0218] The Fenton reactor is equipped with an internal circulation pipeline, which includes a ferrous sulfate (FeSO4) dosing device and a hydrogen peroxide (H2O2) dosing device. The top of the Fenton reactor has a Fenton reactor outlet, which is connected to a three-stage sedimentation and filtration device via a hydraulic pump.

[0219] The three-stage sedimentation filtration device has three identical reaction zones, with filter plates between them and water distribution holes on the filter plates. Each reaction zone has multiple parallel inclined baffles. The packing materials filling the three reaction zones, from top to bottom, are anthracite, quartz sand, and modified zeolite.

[0220] The high-concentration organic wastewater treatment device of the present invention can also be implemented by the following technical solutions:

[0221] Furthermore, the water supply device and the sulfuric acid (H2SO4) dosing device are connected to a booster pump at one end and a pipeline mixer at the other end, for quickly and evenly mixing wastewater with sulfuric acid (H2SO4).

[0222] Furthermore, the micro-electrolysis cell has a micro-electrolysis cell inlet at the top, which is connected to the multi-stage packing layer track, and a sludge discharge port at the bottom.

[0223] Furthermore, in the micro-electrolysis cell, the multi-level packing layer track is a parallel and staggered track of 3, 4, or 5 levels, used to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material wrapped and fixed by a filter steel mesh.

[0224] Furthermore, the Fenton reactor is equipped with a micro-nano aerator at the bottom, and the micro-nano bubbles generated by the micro-nano aerator are sent into the interior of the Fenton reactor through the air distribution holes at the bottom of the Fenton reactor.

[0225] Furthermore, the Fenton reactor is equipped with an internal circulation pump and valves in the internal circulation pipeline for regulating the ferrous sulfate (FeSO4) dosing device and the hydrogen peroxide (H2O2) dosing device in the internal circulation pipeline.

[0226] Furthermore, in the Fenton reactor, the internal circulation pipeline is located outside the Fenton reactor; the upper end of the internal circulation pipeline is connected to the upper part of the Fenton reactor, and the lower end is connected to the internal circulation inlet at the bottom of the Fenton reactor.

[0227] Furthermore, the three-stage sedimentation and filtration device is provided with an inlet at the top, an outlet at the bottom, and a return pipe with a valve on the return pipe.

[0228] Furthermore, in the aforementioned micro-electrolysis cell, the inclined baffle has an angle of inclination of 30°-45° with the horizontal line, and the highest point of the baffle is lower than the inlet of the micro-electrolysis cell.

[0229] Furthermore, in the aforementioned microelectrolysis cell, the volume of the iron-carbon packing material accounts for 10%-25% of the effective volume of the microelectrolysis cell.

[0230] Furthermore, in the micro-electrolysis cell, the volume between any two adjacent iron-carbon filler regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler region.

[0231] Furthermore, in the Fenton reactor, the aeration head of the micro-nano aerator is supplied with ozone (O3) to generate micro-nano bubble ozone (O3), thereby enhancing the generation of hydroxyl radicals (·OH) during the Fenton reaction.

[0232] Furthermore, in the aforementioned three-stage sedimentation filtration device, the inclined baffle has an angle of inclination of 60°-75° with the horizontal line.

[0233] Furthermore, in the aforementioned three-stage sedimentation filtration device, the particle size of the three types of packing materials decreases sequentially from top to bottom: the particle size of anthracite is 1.2-1.5 mm, the particle size of quartz sand is 0.8-1.0 mm, and the particle size of modified zeolite is 0.4-0.6 mm, with a uniformity coefficient of 2 for each.

[0234] The beneficial effects of this invention are as follows:

[0235] 1. This invention couples micro-electrolysis, Fenton oxidation, and ozone catalytic oxidation technologies to fully leverage the synergistic effect of multiple oxidation technologies, thereby improving the treatment efficiency of high-concentration organic wastewater, reducing reagent dosage, and achieving efficient degradation of recalcitrant organic matter; further, it combines micro-flocculation filtration technology to further remove suspended solids, ammonia nitrogen, and Fe. 2+ Fe 3+ And other impurities, ultimately achieving deep treatment of high-concentration organic wastewater.

[0236] ① The pH value of the micro-electrolysis reaction is 2.0-3.0. The wastewater consumes H₂ under the action of micro-electrolysis. + This raises the pH value, which perfectly meets the suitable pH value of 3.0-5.0 for the subsequent Fenton reaction, thus eliminating the need for pH adjustment reagents and effectively reducing reagent costs.

[0237] ② In the micro-electrolysis reaction, the iron-carbon filler utilizes the 1.2V electrode potential difference generated between iron and carbon to form numerous micro-galvanic cells, degrading organic matter through redox reactions. The Fe generated at the anode... 2+ The [H] generated at the cathode is highly reactive and can further undergo redox reactions with organic matter, breaking down and opening the chains and rings of recalcitrant macromolecular chain and cyclic organic compounds, decomposing them into easily biodegradable small-molecule organic compounds, and killing the microorganisms within them; simultaneously, Fe... 2+ The hydrolysis products continue to degrade organic matter through flocculation, Fe 2+ It can also provide Fe for the subsequent Fenton reaction. 2+ Catalyst, reducing Fe content 2+ The amount of salt added.

[0238] ③ In the Fenton reaction, hydrogen peroxide (H2O2) reacts with Fe in an acidic environment. 2+ The catalyst forms the Fenton reaction, generating highly oxidizing hydroxyl radicals (·OH), which can efficiently and non-selectively degrade organic pollutants, breaking down large organic molecules into smaller ones or directly mineralizing them into inorganic substances CO2 and H2O. As the reaction proceeds, the Fe in the system... 2+ H + Gradually consumed, some Fe 2+ Oxidized by hydrogen peroxide (H2O2) to Fe 3+ Fe 2+ Fe 3+ Both are excellent inorganic flocculants. Their hydrolysis products act on suspended solids and recalcitrant organic matter in wastewater through flocculation and adsorption, with particularly significant effects on organic wastewater containing chromophores and auxochromes. Furthermore, the synergistic treatment of high-concentration organic wastewater by ozone catalytic oxidation and Fenton oxidation can promote the generation of more hydroxyl radicals (·OH), thereby enhancing the treatment effect on recalcitrant organic matter.

[0239] ④ In a three-stage sedimentation and filtration device, pollutant particles in wastewater are separated into Fe... 2+ Fe 3+ Under the flocculation effect, the pollutants are coagulated into micro-flocculated particles, which are then filtered sequentially through anthracite, quartz sand, and modified zeolite. This completes the micro-flocculation, filtration, adsorption, interception, and sedimentation process of pollutants in the wastewater, effectively removing suspended solids, ammonia nitrogen, and Fe from the wastewater. 2+ Fe 3+ It removes impurities and other impurities, achieving the goal of deep wastewater treatment.

[0240] 2. The parallel and interlaced multi-level packing layer track structure of the micro-electrolysis cell of this invention, compared with the existing simple packing stacking method, can not only extend the filtration channel, improve space utilization and filtration efficiency, but also avoid the passivation and caking of the packing. Among them, the inclined baffle structure design allows wastewater to flow along the track to the packing layer to participate in the reaction, which helps to reduce power consumption and extend the filtration channel. At the same time, the structure design of the iron-carbon packing being wrapped and fixed by the filter steel mesh can prevent the packing from being lost with the water flow, clogging the equipment and pipelines, and can also prevent the secondary pollution of water quality caused by the loss of packing, thereby affecting subsequent treatment processes. In addition, the structural design of the spacing between any two adjacent iron-carbon packing areas can reduce filtration resistance, improve water permeability, and also avoid the passivation and caking of the packing.

[0241] 3. In this invention, a micro / nano aerator is used in the Fenton reactor to improve the reaction process of the Fenton process. The function of the micro / nano aerator is:

[0242] ① The micro-nano bubble ozone O3 generated by the micro-nano aerator has a large specific surface area and slow movement speed, which is conducive to gas-liquid mass transfer and prolongs the reaction time of ozone O3 in wastewater; ozone catalytic oxidation and Fenton oxidation can play a synergistic promoting role. When the micro-nano bubble ozone O3 breaks, the chemical energy accumulated at the gas-liquid interface is also released instantly, thereby stimulating the generation of more highly oxidizing hydroxyl radicals (·OH), which enhances the degradation process of organic matter by Fenton.

[0243] ② The micro-nano bubbles generated by the micro-nano aerator can intensify the turbulence of the cutting wastewater, thereby rapidly mixing the wastewater with ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) agents, promoting the Fenton reaction process, and eliminating the need for stirring equipment.

[0244] 4. The internal circulation pipeline of the Fenton reactor of the present invention not only promotes the mass transfer process in the Fenton reactor and improves the efficiency of the Fenton reaction, but also allows the ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) in the refluxed wastewater to be reused, thereby improving the utilization rate of the reagents and reducing the cost of the reagents.

[0245] 5. The three-stage filtration device of the present invention improves the filtration device by incorporating an inclined plate sedimentation design. The function of the three-stage filtration device is:

[0246] ① The three types of packing materials used in the three-stage filtration system have decreasing particle size and increasing density from top to bottom. This structure not only improves the filter layer's ability to hold pollutants, but the heavier, smaller-particle-size lower layer of packing material also ensures the quality of the filtered water. Pollutant particles in wastewater... 2+ Fe 3+ Under the flocculation effect, the particles are agglomerated into micro-flocculated particles. Through the adsorption and interception of the first-stage anthracite packing, some particles are removed. Due to the large particle size of anthracite and the large pores between the anthracite packing, the particles that are not adsorbed and intercepted by the anthracite enter the second-stage quartz sand packing. Through the adsorption and interception of the quartz sand, most of the particles are removed. Among them, the third-stage modified zeolite packing, due to its smaller particle size, plays a role in fine filtration during the filtration process, ensuring the quality of the effluent. At the same time, the modified zeolite also has an adsorption effect on ammonia nitrogen in the wastewater.

[0247] ② The addition of inclined plate sedimentation to the filtration device not only extends the filtration channel but also accelerates the sedimentation rate of particulate matter. Three-stage filtration and inclined plate sedimentation are achieved within a single device, leveraging multiple functions such as micro-flocculation, filtration, adsorption, interception, and sedimentation.

[0248] The present invention proposes an apparatus and method for treating high-concentration organic wastewater, which employs a process coupling of micro-electrolysis, Fenton oxidation, ozone catalytic oxidation, and micro-flocculation filtration to reduce the amount of Fenton ferrous salt used, eliminate the need for flocculant addition, lower operating costs, and efficiently treat high-concentration organic wastewater. Through a rationally designed reactor structure, it achieves reduced power consumption, improved space and reagent utilization, avoids packing blockage, and enhances reaction efficiency. It boasts advantages such as high treatment efficiency, fast reaction speed, simple operation, and low operating costs.

[0249] This invention represents a significant contribution and advancement compared to existing technologies, and is indeed a novel, inventive, and practical technology. Attached Figure Description

[0250] Figure 1 is a schematic diagram of the high-concentration organic wastewater treatment device according to an embodiment of the present invention;

[0251] The markings in the diagram have the following meanings:

[0252] 001 - Valve;

[0253] 100-Water supply device, 101-Boost pump, 102-Sulfuric acid (H2SO4) dosing device, 103-Pipeline mixer;

[0254] 200-Micro electrolysis cell, 201-Micro electrolysis cell inlet, 202-Baffle, also known as the first baffle, 203-Iron-carbon packing, 204-Sludge discharge port, 205-Micro electrolysis cell outlet;

[0255] 300-Fenton reactor, 301-Micro-nano aerator, 302-Micro-nano bubbles, 303-Air distribution holes, 304-Internal circulation pipeline, 305-Ferrous sulfate (FeSO4) dosing device, 306-Hydrogen peroxide (H2O2) dosing device, 307-Internal circulation pump, 308-Internal circulation inlet, 309-Fenton reactor outlet, 310-Hydraulic pump;

[0256] 400 - Three-stage sedimentation and filtration device; 401 - Inlet of three-stage sedimentation and filtration device; 402 - Filter plate; 403 - Water distribution hole; 404 - Baffle, also known as second baffle; 405 - Anthracite; 406 - Quartz sand; 407 - Modified zeolite; 408 - Outlet pipe of three-stage sedimentation and filtration device; 409 - Return pipe. Detailed Implementation

[0257] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0258] Example 1: A method for treating high-concentration organic wastewater

[0259] An embodiment of the present invention provides a method for treating high-concentration organic wastewater, employing a treatment device for high-concentration organic wastewater as described in the embodiment. The wastewater's water quality characteristics are: COD... Cr With a concentration of 5000 mg / L, ss ≤ 100 mg / L, and a color intensity of 5000 times, the treatment steps are as follows:

[0260] ① High-concentration organic wastewater enters the inlet pipeline via booster pump 101, and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by sulfuric acid (H2SO4) dosing device 102 via pipeline mixer 103. The pH value is adjusted to 2.0, and then it enters the micro-electrolysis cell 200.

[0261] ② The wastewater from the previous step enters the inlet 201 of the micro-electrolysis cell and flows by gravity along the inclined baffle 202 to the multi-stage packing layer track. The multi-stage packing layer is equipped with multiple iron-carbon packing materials 203 that are spaced apart and fixed by filter steel mesh. The hydraulic retention time of the wastewater is 20 minutes, and then it flows to the Fenton reactor 300.

[0262] ③ The wastewater from the previous step enters the Fenton reactor 300, where it mixes with the ferrous sulfate (FeSO4) dosing device 305 and the hydrogen peroxide (H2O2) dosing device 306 pumped from the internal circulation pipeline 304. The hydrogen peroxide (H2O2) then reacts with the COD of the wastewater. Cr The mass concentration ratio is 1:1, and the hydraulic retention time of the wastewater is 20 min. The micro-nano aerator 301 connected to the bottom of the Fenton reactor 300 generates micro-nano bubble ozone O3302, which is sent into the interior of the Fenton reactor 300 through the air distribution hole 303. The ratio of the micro-nano bubble ozone O3302 aeration rate to the water volume of the Fenton reactor 300 is 2:1. The internal circulation pipeline 304 connected to the outside of the Fenton reactor 300 has an internal circulation return flow rate to the influent flow rate of the Fenton reactor 300 of 1:5.

[0263] The wastewater treated by the Fenton reactor 300 overflows to the Fenton reactor outlet 309 at the top under the combined action of the buoyancy of micro-nano bubble ozone O33O2 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device 400 under the action of the hydraulic pump 310.

[0264] ④ The wastewater from the previous step enters the inlet 401 of the three-stage sedimentation and filtration device. After being filtered by the packing material filled in the reaction zone, it enters the next reaction zone through the water distribution holes 403 on the filter plate 402. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite. The hydraulic retention time of the wastewater is 20 minutes. After the wastewater is treated by the three-stage sedimentation and filtration device 400, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device. If it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device 400 for recirculation.

[0265] COD of treated effluent Cr ≤40mg / L, ss≤50mg / L, color ≤50 times.

[0266] Example 2: A method for treating high-concentration organic wastewater

[0267] An embodiment of the present invention provides a method for treating high-concentration organic wastewater, employing a treatment device for high-concentration organic wastewater as described in the embodiment. The wastewater's water quality characteristics are: COD... Cr The concentration is 10000 mg / L, ss ≤ 300 mg / L, and the color intensity is 10000 times. The treatment steps are as follows:

[0268] ① High-concentration organic wastewater enters the inlet pipeline via booster pump 101, and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by sulfuric acid (H2SO4) dosing device 102 via pipeline mixer 103 to adjust the pH value to 2.5, and then enters the micro-electrolysis cell 200.

[0269] ② The wastewater from the previous step enters the inlet 201 of the micro-electrolysis cell and flows by gravity along the inclined baffle 202 to the multi-stage packing layer track. The multi-stage packing layer is equipped with multiple iron-carbon packing materials 203 that are spaced apart and fixed by filter steel mesh. The hydraulic retention time of the wastewater is 30 minutes, and then it flows to the Fenton reactor 300.

[0270] ③ The wastewater from the previous step enters the Fenton reactor 300, where it mixes with the ferrous sulfate (FeSO4) dosing device 305 and the hydrogen peroxide (H2O2) dosing device 306 pumped from the internal circulation pipeline 304. The hydrogen peroxide (H2O2) then reacts with the COD of the wastewater. CrThe mass concentration ratio is 2:1, and the hydraulic retention time of the wastewater is 40 min. The micro-nano aerator 301 connected to the bottom of the Fenton reactor 300 generates micro-nano bubble ozone O3302, which is sent into the interior of the Fenton reactor 300 through the air distribution hole 303. The ratio of the micro-nano bubble ozone O3302 aeration rate to the water volume of the Fenton reactor 300 is 4:1. The internal circulation pipeline 304 connected to the outside of the Fenton reactor 300 has an internal circulation return flow rate to the influent flow rate of the Fenton reactor 300 of 1:4.

[0271] The wastewater treated by the Fenton reactor 300 overflows to the Fenton reactor outlet 309 at the top under the combined action of the buoyancy of micro-nano bubble ozone O33O2 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device 400 under the action of the hydraulic pump 310.

[0272] ④ The wastewater from the previous step enters the inlet 401 of the three-stage sedimentation and filtration device. After being filtered by the packing material filled in the reaction zone, it enters the next reaction zone through the water distribution holes 403 on the filter plate 402. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite. The hydraulic retention time of the wastewater is 40 minutes. After the wastewater is treated by the three-stage sedimentation and filtration device 400, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device. If it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device 400 for recirculation.

[0273] COD of treated effluent Cr ≤70mg / L, ss≤100mg / L, color ≤80 times.

[0274] Example 3: A method for treating high-concentration organic wastewater

[0275] An embodiment of the present invention provides a method for treating high-concentration organic wastewater, employing a treatment device for high-concentration organic wastewater as described in the embodiment. The wastewater's water quality characteristics are: COD... Cr The concentration is 25000 mg / L, ss ≤ 500 mg / L, and the color intensity is 30000 times. The treatment steps are as follows:

[0276] ① High-concentration organic wastewater enters the inlet pipeline via booster pump 101, and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by sulfuric acid (H2SO4) dosing device 102 via pipeline mixer 103 to adjust the pH value to 3.0, and then enters the micro-electrolysis cell 200.

[0277] ② The wastewater from the previous step enters the inlet 201 of the micro-electrolysis cell and flows by gravity along the inclined baffle 202 to the multi-stage packing layer track. The multi-stage packing layer is equipped with multiple iron-carbon packing materials 203 that are spaced apart and fixed by filter steel mesh. The hydraulic retention time of the wastewater is 60 minutes, and then it flows to the Fenton reactor 300.

[0278] ③ The wastewater from the previous step enters the Fenton reactor 300, where it mixes with the ferrous sulfate (FeSO4) dosing device 305 and the hydrogen peroxide (H2O2) dosing device 306 pumped from the internal circulation pipeline 304. The hydrogen peroxide (H2O2) then reacts with the COD of the wastewater. Cr The mass concentration ratio is 3:1, and the hydraulic retention time of the wastewater is 60 min. The micro-nano aerator 301 connected to the bottom of the Fenton reactor 300 generates micro-nano bubble ozone O3302, which is sent into the interior of the Fenton reactor 300 through the air distribution hole 303. The ratio of the micro-nano bubble ozone O3302 aeration rate to the water volume of the Fenton reactor 300 is 6:1. The internal circulation pipeline 304 connected to the outside of the Fenton reactor 300 has an internal circulation return flow rate to the influent flow rate of the Fenton reactor 300 of 1:3.

[0279] The wastewater treated by the Fenton reactor 300 overflows to the Fenton reactor outlet 309 at the top under the combined action of the buoyancy of micro-nano bubble ozone O33O2 and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device 400 under the action of the hydraulic pump 310.

[0280] ④ The wastewater from the previous step enters the inlet 401 of the three-stage sedimentation and filtration device. After being filtered by the packing material filled in the reaction zone, it enters the next reaction zone through the water distribution holes 403 on the filter plate 402. It passes through three stages of filtration from top to bottom: anthracite, quartz sand, and modified zeolite. The hydraulic retention time of the wastewater is 60 minutes. After the wastewater is treated by the three-stage sedimentation and filtration device 400, if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device. If it does not meet the standard, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device 400 for recirculation.

[0281] COD of treated effluent Cr ≤100mg / L, ss≤160mg / L, color ≤100 times.

[0282] Example: A device for treating high-concentration organic wastewater, an example of the aforementioned wastewater treatment method.

[0283] An embodiment of the present invention provides a treatment device for high-concentration organic wastewater, the structure of which is as follows: the device mainly includes a water supply device 100, a micro-electrolysis cell 200, a Fenton reactor 300, and a three-stage sedimentation and filtration device 400.

[0284] The water supply device 100 includes a booster pump 101, a sulfuric acid (H2SO4) dosing device 102, and a pipeline mixer 103, which adjusts the pH value of high-concentration organic wastewater and sends it into the micro-electrolysis cell 200.

[0285] The micro-electrolysis cell 200 has a micro-electrolysis cell inlet 201 at its top; multiple parallel and intersecting inclined baffles 202 are arranged inside the micro-electrolysis cell 200, with the inclination angle of the baffles 202 to the horizontal line being 30°-45°, and the highest point of the baffles 202 being lower than the micro-electrolysis cell inlet; a packing layer is arranged between the baffles 202, forming a multi-level packing layer track of 3, 4, or 5 levels of parallel and intersecting packing layers; the packing layer is filled with iron-carbon packing 203 wrapped and fixed by a filter steel mesh, and the volume of the iron-carbon packing 203 accounts for 10%-25% of the effective volume of the micro-electrolysis cell 200; the volume between any two adjacent iron-carbon packing 203 areas in each packing layer accounts for 30%-60% of the volume of each iron-carbon packing 203 area; the bottom of the micro-electrolysis cell 200 has a sludge discharge port 204 and a micro-electrolysis cell outlet 205.

[0286] The Fenton reactor 300 has a micro-nano aerator 301 at its bottom, with ozone (O3) entering through the aerator head. The micro-nano bubbles 302 generated by the micro-nano aerator 301 are sent into the interior of the Fenton reactor 300 through the air distribution holes 303 at the bottom of the Fenton reactor 300. An internal circulation pipeline 304 is provided on the outside of the Fenton reactor 300. The internal circulation pipeline 304 mainly includes a ferrous sulfate (FeSO4) dosing device 305, a hydrogen peroxide (H2O2) dosing device 306, an internal circulation pump 307, and a valve 001. The upper end of the internal circulation pipeline 304 is connected to the upper part of the Fenton reactor 300, and the lower end is connected to the internal circulation inlet 308 at the bottom of the Fenton reactor 300. The top of the Fenton reactor 300 has a Fenton reactor outlet 309, which is connected to a three-stage sedimentation and filtration device 400 through a hydraulic pump 310.

[0287] A three-stage sedimentation and filtration device 400 has an inlet 401 at the top; it has three identical reaction zones, with filter plates 402 between them, each with water distribution holes 403; each reaction zone has multiple parallel inclined baffles 404, with an inclination angle of 60°-75° to the horizontal; the packing materials in the three reaction zones, from top to bottom, are 1.2-1.5mm anthracite 405, 0.8-1.0mm quartz sand 406, and 0.4-0.6mm modified zeolite 407, all with a uniformity coefficient of 2; an outlet pipe 408 is located at the bottom of the device; a return pipe 409 is also located at the bottom, with a valve 001 on it.

[0288] The aforementioned high-concentration organic wastewater treatment device, through optimized process design, incorporates a coupled technology of micro-electrolysis oxidation, Fenton oxidation, and ozone catalytic oxidation. This synergistic effect of multiple oxidation technologies reduces reagent usage and achieves highly efficient removal of recalcitrant organic matter. Furthermore, micro-flocculation filtration technology further removes ammonia nitrogen and Fe. 2+ Fe 3+ The process removes impurities and achieves advanced treatment of high-concentration organic wastewater. By rationally designing the packing structure inside the micro-electrolysis cell and incorporating parallel, staggered multi-stage filtration layers, space utilization is improved, and the problems of packing passivation and caking are solved. The addition of a micro-nano ozone (O3) aerator enhances the Fenton reaction efficiency and reduces reaction power consumption. The addition of an internal circulation pipeline improves Fenton reaction efficiency and reagent utilization. The addition of a three-stage sedimentation filtration device improves filtration accuracy. The design of inclined plate sedimentation in the filtration device not only extends the filtration channel but also accelerates the sedimentation rate of particulate matter, leveraging multiple functions including micro-flocculation, filtration, adsorption, interception, and sedimentation. The overall process flow is complementary and mutually reinforcing, resulting in high treatment efficiency, wide applicability, simple equipment structure, and low operating costs. Compared to existing processes, it has significant technical advantages and is highly suitable for the efficient and advanced treatment of high-concentration organic wastewater.

[0289] Example: A high-concentration organic wastewater treatment device, wherein the micro-electrolysis cell 200 has the following structure: The micro-electrolysis cell 200 has a micro-electrolysis cell inlet 201 at its top; the micro-electrolysis cell 200 has multiple parallel inclined baffles 202 inside, with outlets on both sides of the baffles 202 staggered left and right, the inclination angle of the baffles 202 to the horizontal line being 30°-45°, and the highest point of the baffles 202 being lower than the micro-electrolysis cell inlet; a packing layer is provided between adjacent baffles 202, forming a 3-stage... The micro-electrolysis cell 200 has a multi-level packing layer track with 4 or 5 parallel and staggered levels. The packing layer is filled with iron-carbon packing 203 wrapped and fixed by a filter steel mesh. The volume of the iron-carbon packing 203 accounts for 10%-25% of the effective volume of the micro-electrolysis cell 200. The volume between any two adjacent iron-carbon packing 203 areas in each packing layer accounts for 30%-60% of the volume of each iron-carbon packing 203 area. The bottom of the micro-electrolysis cell 200 is provided with a sludge discharge port 204 and a micro-electrolysis cell outlet 205.

[0290] The aforementioned micro-electrolysis cell breaks down and opens the chains and rings of large chain and cyclic organic molecules through micro-electrolysis reactions, decomposing them into easily biodegradable small organic molecules. This effectively degrades organic matter in wastewater and kills microorganisms. The multi-stage filtration layer's parallel and staggered structure not only slows down the passivation and caking of the filter media, improving filtration efficiency, but also extends the filtration channels, increasing space utilization. The iron-carbon filter media, secured by a steel mesh, prevents the media from being lost with the water flow, clogging equipment and pipelines, and also avoids secondary water pollution caused by media loss, which could affect subsequent treatment processes.

[0291] Example: A high-concentration organic wastewater treatment device, wherein the Fenton reactor 300 has the following structure: a micro-nano aerator 301 is provided at the bottom of the Fenton reactor 300, the aerator head is equipped with ozone (O3) for air intake, and the micro-nano bubbles 302 generated by the micro-nano aerator 301 are sent into the interior of the Fenton reactor 300 through the air distribution holes 303 at the bottom of the Fenton reactor 300; an internal circulation pipeline 304 is provided on the outside of the Fenton reactor 300, which mainly includes a ferrous sulfate (FeSO4) dosing device 305, a hydrogen peroxide (H2O2) dosing device 306, an internal circulation pump 307, and a valve 001; the upper end of the internal circulation pipeline 304 is connected to the upper part of the Fenton reactor 300, and the lower end is connected to the internal circulation inlet 308 at the bottom of the Fenton reactor 300; the top of the Fenton reactor 300 is equipped with a Fenton reactor outlet 309, which is connected to a three-stage sedimentation and filtration device 400 through a hydraulic pump 310.

[0292] The aforementioned Fenton reactor uses ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2) pumped out by the ferrous sulfate (FeSO4) dosing device and hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline to form a Fenton oxidation system, generating highly oxidizing hydroxyl radicals (·OH), thereby efficiently and non-selectively degrading organic matter.

[0293] The aforementioned micro-nano aerator connected to the bottom of the Fenton reactor generates micro-nano bubble ozone (O3), which is then introduced into the Fenton reactor through air distribution holes. The strong oxidizing properties of ozone (O3) can not only oxidize inorganic matter in wastewater but also oxidize organic matter that is difficult to biodegrade. At the same time, the catalytic oxidation effect of ozone (O3) can also play a synergistic promoting role with the Fenton oxidation reaction, stimulating the generation of more hydroxyl radicals (·OH), thereby strengthening the degradation process of organic matter by the Fenton reaction. In addition, micro-nano bubble ozone (O3) can also aggravate the turbulence of wastewater, playing a role in stirring and mixing.

[0294] The aforementioned internal circulation pipeline connected to the outside of the Fenton reactor is used to re-enter a portion of the treated wastewater into the Fenton reactor under the action of the internal circulation pump, mix it with the influent, and treat it again. The internal circulation pipeline can intensify the swirling motion of the wastewater in the Fenton reactor, thereby improving the Fenton reaction efficiency. It can also allow FeSO4 and H2O2 to be reused, improving the utilization rate of the reagents and reducing the cost of the reagents.

[0295] Example: A high-concentration organic wastewater treatment device, comprising a three-stage sedimentation and filtration device 400, the structure of which is as follows: the three-stage sedimentation and filtration device 400 has a three-stage sedimentation and filtration device inlet 401 at the top; the three-stage sedimentation and filtration device 400 has three identical reaction zones, with filter plates 402 between the reaction zones, and water distribution holes 403 on the filter plates 402; each reaction zone has multiple parallel inclined baffles 404, with the inclination angle between the baffles 404 and the horizontal line being 60°-75°; the packing materials of the three reaction zones, from top to bottom, are 1.2-1.5mm anthracite 405, 0.8-1.0mm quartz sand 406, and 0.4-0.6mm modified zeolite 407, all with a non-uniformity coefficient of 2; the three-stage sedimentation and filtration device 400 has a three-stage sedimentation and filtration device outlet pipe 408 at the bottom; the three-stage sedimentation and filtration device 400 also has a return pipe 409 at the bottom, with a valve 001 on the return pipe 409.

[0296] The aforementioned three-stage sedimentation and filtration device, through the sequential filling of anthracite, quartz sand, and modified zeolite, completes the processes of micro-flocculation, filtration, adsorption, interception, and sedimentation of pollutants in wastewater, effectively removing suspended solids, ammonia nitrogen, and Fe from the wastewater. 2+ Fe 3+ The wastewater is treated by a three-stage sedimentation and filtration device to remove impurities and achieve deep wastewater treatment. If the effluent meets the standards after treatment, it overflows through the outlet pipe of the three-stage sedimentation and filtration device. If it does not meet the standards, it returns to the inlet pipe through the return pipe at the bottom of the three-stage sedimentation and filtration device for recirculation.

Claims

1. A method for treating high-concentration organic wastewater, wherein, The wastewater treatment method uses a high-concentration organic wastewater treatment device, which includes a water supply device (100) connected in sequence to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). Alternatively, the filler layer of the multi-stage filler layer track is filled with iron-carbon filler (203) that is wrapped and fixed by a filter steel mesh; Furthermore, in the micro-electrolysis cell (200), the inclined first baffle (202) has an inclination angle of 30°-45° with the horizontal line, and the highest point of the first baffle is lower than the inlet (201) of the micro-electrolysis cell. In the microelectrolysis cell (200), the volume of iron-carbon filler (203) accounts for 10%-25% of the effective volume of the microelectrolysis cell (200); In the micro-electrolysis cell (200), the volume between any two adjacent iron-carbon filler (203) regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region. It has the following steps: ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment; High-concentration organic wastewater enters the inlet pipeline via a booster pump (101), and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device (102) via a pipeline mixer (103) to adjust the pH value to 2.0-3.0, and then enters the micro-electrolysis cell (200). ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater. Wastewater from the preceding steps enters through the micro-electrolysis cell inlet (201) and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track; The multi-stage packing layer contains multiple iron-carbon packing materials (203) that are spaced apart from each other and fixed by a filter steel mesh; The micro-electrolysis cell (200) is equipped with a sludge discharge port (204) at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor (300); ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater; The wastewater from the previous step enters the Fenton reactor (300), and together with the ferrous sulfate (FeSO4) dosing device (305) and hydrogen peroxide (H2O2) dosing device (306) on the internal circulation pipeline (304), they form the Fenton oxidation system. The micro-nano aerator (301) connected to the bottom of the Fenton reactor (300) generates micro-nano bubble ozone O3 (302), which is sent into the interior of the Fenton reactor (300) through the air distribution hole (303); The internal circulation pipeline (304) connected to the outside of the Fenton reactor (300) is used to re-enter the Fenton reactor through the internal circulation pipeline (304) under the action of the internal circulation pump (307), mix with the influent and treat it again; The wastewater treated by the Fenton reactor (300) overflows to the outlet (309) of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 (302) and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device (400) under the action of the hydraulic pump (310). ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater. Wastewater enters the inlet (401) of the three-stage sedimentation and filtration device, and after being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes (403) on the filter plate (402), and passes through the three-stage filtration of anthracite, quartz sand and modified zeolite from top to bottom. After the wastewater is treated by the three-stage sedimentation and filtration device (400), if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device (400).

2. A method for treating high-concentration organic wastewater, wherein, The wastewater treatment method uses a high-concentration organic wastewater treatment device, which includes a water supply device (100) connected in sequence to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). Alternatively, the filler layer of the multi-stage filler layer track is filled with iron-carbon filler (203) that is wrapped and fixed by a filter steel mesh; Furthermore, in the micro-electrolysis cell (200), the inclined first baffle (202) has an inclination angle of 30°-45° with the horizontal line, and the highest point of the first baffle is lower than the inlet (201) of the micro-electrolysis cell. In the microelectrolysis cell (200), the volume of iron-carbon filler (203) accounts for 10%-25% of the effective volume of the microelectrolysis cell (200); In the micro-electrolysis cell (200), the volume between any two adjacent iron-carbon filler (203) regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region. It has the following steps: ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment; High-concentration organic wastewater enters the inlet pipeline via a booster pump (101), and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device (102) via a pipeline mixer (103) to adjust the pH value to 2.0-3.0, and then enters the micro-electrolysis cell (200). ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater. Wastewater from the preceding steps enters through the micro-electrolysis cell inlet (201) and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track; The multi-stage packing layer contains multiple iron-carbon packing materials (203) that are spaced apart from each other and fixed by a filter steel mesh; The micro-electrolysis cell (200) is equipped with a sludge discharge port (204) at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor (300); ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater; The wastewater from the previous step enters the Fenton reactor (300), and together with the ferrous sulfate (FeSO4) dosing device (305) and hydrogen peroxide (H2O2) dosing device (306) on the internal circulation pipeline (304), they form the Fenton oxidation system. The micro-nano aerator (301) connected to the bottom of the Fenton reactor (300) generates micro-nano bubble ozone O3 (302), which is sent into the interior of the Fenton reactor (300) through the air distribution hole (303); The internal circulation pipeline (304) connected to the outside of the Fenton reactor (300) is used to re-enter the Fenton reactor through the internal circulation pipeline (304) under the action of the internal circulation pump (307), mix with the influent and treat it again; The wastewater treated by the Fenton reactor (300) overflows to the outlet (309) of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 (302) and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device (400) under the action of the hydraulic pump (310). ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater. Wastewater enters the inlet (401) of the three-stage sedimentation and filtration device, and after being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes (403) on the filter plate (402), and passes through the three-stage filtration of anthracite, quartz sand and modified zeolite from top to bottom. After the wastewater is treated by the three-stage sedimentation and filtration device (400), if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device (400). Furthermore, in step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes.

3. A method for treating high-concentration organic wastewater, wherein, The wastewater treatment method uses a high-concentration organic wastewater treatment device, which includes a water supply device (100) connected in sequence to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). Alternatively, the filler layer of the multi-stage filler layer track is filled with iron-carbon filler (203) that is wrapped and fixed by a filter steel mesh; Furthermore, in the micro-electrolysis cell (200), the inclined first baffle (202) has an inclination angle of 30°-45° with the horizontal line, and the highest point of the first baffle is lower than the inlet (201) of the micro-electrolysis cell. In the microelectrolysis cell (200), the volume of iron-carbon filler (203) accounts for 10%-25% of the effective volume of the microelectrolysis cell (200); In the micro-electrolysis cell (200), the volume between any two adjacent iron-carbon filler (203) regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region. It has the following steps: ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment; High-concentration organic wastewater enters the inlet pipeline via a booster pump (101), and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device (102) via a pipeline mixer (103) to adjust the pH value to 2.0-3.0, and then enters the micro-electrolysis cell (200). ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater. Wastewater from the preceding steps enters through the micro-electrolysis cell inlet (201) and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track; The multi-stage packing layer contains multiple iron-carbon packing materials (203) that are spaced apart from each other and fixed by a filter steel mesh; The micro-electrolysis cell (200) is equipped with a sludge discharge port (204) at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor (300); ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater; The wastewater from the previous step enters the Fenton reactor (300), and together with the ferrous sulfate (FeSO4) dosing device (305) and hydrogen peroxide (H2O2) dosing device (306) on the internal circulation pipeline (304), they form the Fenton oxidation system. The micro-nano aerator (301) connected to the bottom of the Fenton reactor (300) generates micro-nano bubble ozone O3 (302), which is sent into the interior of the Fenton reactor (300) through the air distribution hole (303); The internal circulation pipeline (304) connected to the outside of the Fenton reactor (300) is used to re-enter the Fenton reactor through the internal circulation pipeline (304) under the action of the internal circulation pump (307), mix with the influent and treat it again; The wastewater treated by the Fenton reactor (300) overflows to the outlet (309) of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 (302) and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device (400) under the action of the hydraulic pump (310). ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater. Wastewater enters the inlet (401) of the three-stage sedimentation and filtration device, and after being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes (403) on the filter plate (402), and passes through the three-stage filtration of anthracite, quartz sand and modified zeolite from top to bottom. After the wastewater is treated by the three-stage sedimentation and filtration device (400), if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device (400). In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes. Furthermore, in step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.

0.

4. A method for treating high-concentration organic wastewater, wherein, The wastewater treatment method uses a high-concentration organic wastewater treatment device, which includes a water supply device (100) connected in sequence to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). Alternatively, the filler layer of the multi-stage filler layer track is filled with iron-carbon filler (203) that is wrapped and fixed by a filter steel mesh; Furthermore, in the micro-electrolysis cell (200), the inclined first baffle (202) has an inclination angle of 30°-45° with the horizontal line, and the highest point of the first baffle is lower than the inlet (201) of the micro-electrolysis cell. In the microelectrolysis cell (200), the volume of iron-carbon filler (203) accounts for 10%-25% of the effective volume of the microelectrolysis cell (200); In the micro-electrolysis cell (200), the volume between any two adjacent iron-carbon filler (203) regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region. It has the following steps: ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment; High-concentration organic wastewater enters the inlet pipeline via a booster pump (101), and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device (102) via a pipeline mixer (103) to adjust the pH value to 2.0-3.0, and then enters the micro-electrolysis cell (200). ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater. Wastewater from the preceding steps enters through the micro-electrolysis cell inlet (201) and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track; The multi-stage packing layer contains multiple iron-carbon packing materials (203) that are spaced apart from each other and fixed by a filter steel mesh; The micro-electrolysis cell (200) is equipped with a sludge discharge port (204) at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor (300); ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater; The wastewater from the previous step enters the Fenton reactor (300), and together with the ferrous sulfate (FeSO4) dosing device (305) and hydrogen peroxide (H2O2) dosing device (306) on the internal circulation pipeline (304), they form the Fenton oxidation system. The micro-nano aerator (301) connected to the bottom of the Fenton reactor (300) generates micro-nano bubble ozone O3 (302), which is sent into the interior of the Fenton reactor (300) through the air distribution hole (303); The internal circulation pipeline (304) connected to the outside of the Fenton reactor (300) is used to re-enter the Fenton reactor through the internal circulation pipeline (304) under the action of the internal circulation pump (307), mix with the influent and treat it again; The wastewater treated by the Fenton reactor (300) overflows to the outlet (309) of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 (302) and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device (400) under the action of the hydraulic pump (310). ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater. Wastewater enters the inlet (401) of the three-stage sedimentation and filtration device, and after being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes (403) on the filter plate (402), and passes through the three-stage filtration of anthracite, quartz sand and modified zeolite from top to bottom. After the wastewater is treated by the three-stage sedimentation and filtration device (400), if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device (400). In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes. In step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0; Furthermore, in step ③, the hydraulic retention time of the wastewater in the Fenton reactor is 20-60 minutes. In step ④, the hydraulic retention time of the wastewater in the three-stage sedimentation and filtration device is 20-60 minutes.

5. A method for treating high-concentration organic wastewater, wherein, The wastewater treatment method uses a high-concentration organic wastewater treatment device, which includes a water supply device (100) connected in sequence to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). Alternatively, the filler layer of the multi-stage filler layer track is filled with iron-carbon filler (203) that is wrapped and fixed by a filter steel mesh; Furthermore, in the micro-electrolysis cell (200), the inclined first baffle (202) has an inclination angle of 30°-45° with the horizontal line, and the highest point of the first baffle is lower than the inlet (201) of the micro-electrolysis cell. In the microelectrolysis cell (200), the volume of iron-carbon filler (203) accounts for 10%-25% of the effective volume of the microelectrolysis cell (200); In the micro-electrolysis cell (200), the volume between any two adjacent iron-carbon filler (203) regions in each filler layer accounts for 30%-60% of the volume of each iron-carbon filler (203) region. It has the following steps: ①Water supply: After the pH value of high-concentration organic wastewater is adjusted, it enters the micro-electrolysis treatment; High-concentration organic wastewater enters the inlet pipeline via a booster pump (101), and is rapidly and evenly mixed with sulfuric acid (H2SO4) added by the sulfuric acid (H2SO4) dosing device (102) via a pipeline mixer (103) to adjust the pH value to 2.0-3.0, and then enters the micro-electrolysis cell (200). ② Micro-electrolysis treatment: The wastewater from the previous steps passes through a multi-stage packing layer track, where it undergoes a micro-electrolysis reaction through the iron-carbon packing material inside, thus degrading the organic matter in the wastewater. Wastewater from the preceding steps enters through the micro-electrolysis cell inlet (201) and flows by gravity along the inclined first baffle (202) to the multi-stage packing layer track; The multi-stage packing layer contains multiple iron-carbon packing materials (203) that are spaced apart from each other and fixed by a filter steel mesh; The micro-electrolysis cell (200) is equipped with a sludge discharge port (204) at the bottom, which can periodically discharge the generated sludge; after the wastewater is treated by micro-electrolysis, it will flow to the Fenton reactor (300); ③ Fenton reaction: The wastewater from the previous step generates highly oxidizing hydroxyl radicals (·OH) through the Fenton oxidation reaction, and the strong oxidizing power of the hydroxyl radicals (·OH) is used to degrade the organic matter in the wastewater; The wastewater from the previous step enters the Fenton reactor (300), and together with the ferrous sulfate (FeSO4) dosing device (305) and hydrogen peroxide (H2O2) dosing device (306) on the internal circulation pipeline (304), they form the Fenton oxidation system. The micro-nano aerator (301) connected to the bottom of the Fenton reactor (300) generates micro-nano bubble ozone O3 (302), which is sent into the interior of the Fenton reactor (300) through the air distribution hole (303); The internal circulation pipeline (304) connected to the outside of the Fenton reactor (300) is used to re-enter the Fenton reactor through the internal circulation pipeline (304) under the action of the internal circulation pump (307), mix with the influent and treat it again; The wastewater treated by the Fenton reactor (300) overflows to the outlet (309) of the Fenton reactor under the combined action of the buoyancy of micro-nano bubble ozone O3 (302) and the thrust of the internal circulating water flow, and enters the three-stage sedimentation and filtration device (400) under the action of the hydraulic pump (310). ④ Three-stage sedimentation and filtration: The wastewater from the previous steps is filtered through three stages: anthracite, quartz sand, and modified zeolite, to complete the micro-flocculation, filtration, adsorption, interception, and sedimentation processes of the wastewater, thereby achieving deep treatment of the wastewater. Wastewater enters the inlet (401) of the three-stage sedimentation and filtration device, and after being filtered by the packing material filled in the first reaction zone, it enters the next reaction zone through the water distribution holes (403) on the filter plate (402), and passes through the three-stage filtration of anthracite, quartz sand and modified zeolite from top to bottom. After the wastewater is treated by the three-stage sedimentation and filtration device (400), if the effluent quality meets the standard, it overflows through the outlet pipe of the three-stage sedimentation and filtration device; if it does not meet the standard, it returns to the inlet pipe for recirculation through the return pipe at the bottom of the three-stage sedimentation and filtration device (400). In step ②, the hydraulic retention time of the wastewater in the micro-electrolysis cell is 20-60 minutes. In step ③, the pH value of the influent to the Fenton reactor is controlled to be 3.0-5.0; In step ③, the hydraulic retention time of the wastewater in the Fenton reactor is 20-60 minutes. In step ④, the hydraulic retention time of the wastewater in the three-stage sedimentation and filtration device is 20-60 minutes. Furthermore, in step ③, the ratio of the air volume of the micro-nano aerator to the water volume of the Fenton reactor is 2:1-6:

1. In step ③, the mass concentration ratio of hydrogen peroxide (H2O2) added by the hydrogen peroxide (H2O2) dosing device on the internal circulation pipeline of the Fenton reactor to the COD of the wastewater is 1:1-3:

1. In step ③, the flow rate ratio of the internal circulation reflux of the Fenton reactor to the influent flow rate of the Fenton reactor is 1:5 to 1:

3.

6. A high-concentration organic wastewater treatment device, used in the high-concentration organic wastewater treatment method according to any one of claims 1-5, comprising a water supply device (100), wherein the water supply device is sequentially connected to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400), characterized in that: The water supply device (100) is equipped with a sulfuric acid (H2SO4) dosing device (102) for adjusting the pH value of high-concentration organic wastewater and sending it into the micro-electrolysis cell (200). The Fenton reactor (300) is equipped with an internal circulation pipeline (304), which is equipped with a ferrous sulfate (FeSO4) dosing device (305) and a hydrogen peroxide (H2O2) dosing device (306); the top of the Fenton reactor (300) is equipped with a Fenton reactor outlet (309), which is connected to a three-stage sedimentation and filtration device (400) via a hydraulic pump (310); The three-stage sedimentation filtration device (400) has three identical reaction zones, with a filter plate (402) between the reaction zones and water distribution holes (403) on the filter plate (402); each reaction zone has multiple parallel inclined second baffles (404); the fillers in the three reaction zones are, from top to bottom, anthracite (405), quartz sand (406), and modified zeolite (407).

7. A high-concentration organic wastewater treatment device, used in the high-concentration organic wastewater treatment method according to any one of claims 1-5, comprising a water supply device (100), wherein the water supply device is sequentially connected to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400), characterized in that: The water supply device (100) is equipped with a sulfuric acid (H2SO4) dosing device (102) for adjusting the pH value of high-concentration organic wastewater and sending it into the micro-electrolysis cell (200). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). The Fenton reactor (300) is equipped with an internal circulation pipeline (304), which is equipped with a ferrous sulfate (FeSO4) dosing device (305) and a hydrogen peroxide (H2O2) dosing device (306); the top of the Fenton reactor (300) is equipped with a Fenton reactor outlet (309), which is connected to a three-stage sedimentation and filtration device (400) via a hydraulic pump (310); The three-stage sedimentation filtration device (400) has three identical reaction zones, with filter plates (402) between them. The filter plates (402) have water distribution holes (403). Each reaction zone has multiple parallel inclined second baffles (404). The packing materials filling the three reaction zones from top to bottom are anthracite (405), quartz sand (406), and modified zeolite (407). Furthermore, the sulfuric acid (H2SO4) dosing device (102) in the water supply device (100) is connected to a pipeline mixer (103) at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and to a booster pump (101) at the other end. The micro-electrolysis cell (200) is provided with a micro-electrolysis cell inlet (201) at the top, which is connected to the multi-stage packing layer track, and a sludge discharge port (204) at the bottom.

8. A high-concentration organic wastewater treatment device, used in the high-concentration organic wastewater treatment method according to any one of claims 1-5, comprising a water supply device (100), wherein the water supply device is sequentially connected to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400), characterized in that: The water supply device (100) is equipped with a sulfuric acid (H2SO4) dosing device (102) for adjusting the pH value of high-concentration organic wastewater and sending it into the micro-electrolysis cell (200). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). The Fenton reactor (300) is equipped with an internal circulation pipeline (304), which is equipped with a ferrous sulfate (FeSO4) dosing device (305) and a hydrogen peroxide (H2O2) dosing device (306); the top of the Fenton reactor (300) is equipped with a Fenton reactor outlet (309), which is connected to a three-stage sedimentation and filtration device (400) via a hydraulic pump (310); The three-stage sedimentation filtration device (400) has three identical reaction zones, with filter plates (402) between them. The filter plates (402) have water distribution holes (403). Each reaction zone has multiple parallel inclined second baffles (404). The packing materials filling the three reaction zones from top to bottom are anthracite (405), quartz sand (406), and modified zeolite (407). The sulfuric acid (H2SO4) dosing device (102) in the water supply device (100) is connected to a pipeline mixer (103) at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and to a booster pump (101) at the other end. The micro-electrolysis cell (200) is provided with a micro-electrolysis cell inlet (201) at the top, which is connected to the multi-stage packing layer track, and a sludge discharge port (204) at the bottom. Furthermore, the micro-electrolysis cell (200) has a multi-level packing layer track consisting of 3, 4, or 5 parallel staggered tracks, which is used to extend the filtration channel. The Fenton reactor (300) is equipped with a micro-nano aerator (301) at the bottom. The micro-nano bubbles (302) generated by the micro-nano aerator (301) are sent into the interior of the Fenton reactor (300) through the air distribution holes (303) at the bottom of the Fenton reactor (300). The Fenton reactor (300) is further equipped with an internal circulation pump (307) and a valve (001) in the internal circulation pipeline (304) for regulating the ferrous sulfate (FeSO4) dosing device (305) and the hydrogen peroxide (H2O2) dosing device (306) in the internal circulation pipeline (304).

9. A high-concentration organic wastewater treatment device, used in the high-concentration organic wastewater treatment method according to any one of claims 1-5, comprising a water supply device (100), wherein the water supply device is sequentially connected to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400), characterized in that: The water supply device (100) is equipped with a sulfuric acid (H2SO4) dosing device (102) for adjusting the pH value of high-concentration organic wastewater and sending it into the micro-electrolysis cell (200). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). The Fenton reactor (300) is equipped with an internal circulation pipeline (304), which is equipped with a ferrous sulfate (FeSO4) dosing device (305) and a hydrogen peroxide (H2O2) dosing device (306); the top of the Fenton reactor (300) is equipped with a Fenton reactor outlet (309), which is connected to a three-stage sedimentation and filtration device (400) via a hydraulic pump (310); The three-stage sedimentation filtration device (400) has three identical reaction zones, with filter plates (402) between them. The filter plates (402) have water distribution holes (403). Each reaction zone has multiple parallel inclined second baffles (404). The packing materials filling the three reaction zones from top to bottom are anthracite (405), quartz sand (406), and modified zeolite (407). The sulfuric acid (H2SO4) dosing device (102) in the water supply device (100) is connected to a pipeline mixer (103) at one end for quickly and evenly mixing wastewater with sulfuric acid (H2SO4), and to a booster pump (101) at the other end. The micro-electrolysis cell (200) is provided with a micro-electrolysis cell inlet (201) at the top, which is connected to the multi-stage packing layer track, and a sludge discharge port (204) at the bottom. The micro-electrolysis cell (200) has a multi-level packing layer track consisting of 3, 4, or 5 parallel and staggered tracks to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material (203) wrapped and fixed by a filter steel mesh. The Fenton reactor (300) is equipped with a micro-nano aerator (301) at the bottom. The micro-nano bubbles (302) generated by the micro-nano aerator (301) are sent into the interior of the Fenton reactor (300) through the air distribution holes (303) at the bottom of the Fenton reactor (300). The Fenton reactor (300) is further equipped with an internal circulation pump (307) and a valve (001) in the internal circulation pipeline (304) for regulating the ferrous sulfate (FeSO4) dosing device (305) and the hydrogen peroxide (H2O2) dosing device (306) in the internal circulation pipeline (304); Furthermore, the Fenton reactor (300) has an internal circulation pipeline (304) located outside the Fenton reactor (300); the upper end of the internal circulation pipeline (304) is connected to the upper part of the Fenton reactor (300), and the lower end is connected to the internal circulation inlet (308) at the bottom of the Fenton reactor (300). The three-stage sedimentation and filtration device (400) is provided with a three-stage sedimentation and filtration device inlet (401) at the top; a three-stage sedimentation and filtration device outlet pipe (408) and a return pipe (409) at the bottom, and a valve (001) is provided on the return pipe (409).

10. A high-concentration organic wastewater treatment device, used in the high-concentration organic wastewater treatment method according to any one of claims 1-5, comprising a water supply device (100), wherein the water supply device is sequentially connected to a micro-electrolysis cell (200), a Fenton reactor (300), and a three-stage sedimentation and filtration device (400), characterized in that: The water supply device (100) is equipped with a sulfuric acid (H2SO4) dosing device (102) for adjusting the pH value of high-concentration organic wastewater and sending it into the micro-electrolysis cell (200). The micro-electrolysis cell (200) is equipped with a multi-stage packing layer track, which includes multiple parallel inclined first baffles (202). The outlets on both sides of the first baffles are staggered. A packing layer is provided between adjacent first baffles, and the packing layer is filled with iron-carbon packing (203). The bottom of the micro-electrolysis cell (200) is provided with a micro-electrolysis cell outlet (205), which is connected to the Fenton reactor (300). The Fenton reactor (300) is equipped with an internal circulation pipeline (304), which is equipped with a ferrous sulfate (FeSO4) dosing device (305) and a hydrogen peroxide (H2O2) dosing device (306); the top of the Fenton reactor (300) is equipped with a Fenton reactor outlet (309), which is connected to a three-stage sedimentation and filtration device (400) via a hydraulic pump (310); The three-stage sedimentation filtration device (400) has three identical reaction zones, with filter plates (402) between them. The filter plates (402) have water distribution holes (403). Each reaction zone has multiple parallel inclined second baffles (404). The packing materials filling the three reaction zones from top to bottom are anthracite (405), quartz sand (406), and modified zeolite (407). The water supply device (100) and the sulfuric acid (H2SO4) dosing device (102) are connected to a booster pump (101) at one end and a pipeline mixer (103) at the other end, for quickly and evenly mixing wastewater with sulfuric acid (H2SO4); The micro-electrolysis cell (200) is provided with a micro-electrolysis cell inlet (201) at the top, which is connected to the multi-stage packing layer track, and a sludge discharge port (204) at the bottom. The micro-electrolysis cell (200) has a multi-level packing layer track consisting of 3, 4, or 5 parallel and staggered tracks to extend the filtration channel; the packing layer inside the multi-level packing layer track is filled with iron-carbon packing material (203) wrapped and fixed by a filter steel mesh. The Fenton reactor (300) is equipped with a micro-nano aerator (301) at the bottom. The micro-nano bubbles (302) generated by the micro-nano aerator (301) are sent into the interior of the Fenton reactor (300) through the air distribution holes (303) at the bottom of the Fenton reactor (300). The Fenton reactor (300) is further equipped with an internal circulation pump (307) and a valve (001) in the internal circulation pipeline (304) for regulating the ferrous sulfate (FeSO4) dosing device (305) and the hydrogen peroxide (H2O2) dosing device (306) in the internal circulation pipeline (304); The Fenton reactor (300) has an internal circulation pipeline (304) located outside the Fenton reactor (300); the upper end of the internal circulation pipeline (304) is connected to the upper part of the Fenton reactor (300), and the lower end is connected to the internal circulation inlet (308) at the bottom of the Fenton reactor (300). The three-stage sedimentation and filtration device (400) is provided with a three-stage sedimentation and filtration device inlet (401) at the top; a three-stage sedimentation and filtration device outlet pipe (408) and a return pipe (409) at the bottom, and a valve (001) is provided on the return pipe (409). The Fenton reactor (300) and the micro-nano aerator (301) have ozone (O3) as their air intake, which is used to generate micro-nano bubble ozone (O3) to enhance the generation of hydroxyl radicals (·OH) during the Fenton reaction. The three-stage sedimentation filtration device (400) has an inclined second baffle (404) with an inclination angle of 60°-75° to the horizontal line; The three-stage sedimentation filtration device (400) has three types of fillers with decreasing particle sizes from top to bottom: anthracite with a particle size of 1.2-1.5 mm, quartz sand with a particle size of 0.8-1.0 mm, and modified zeolite with a particle size of 0.4-0.6 mm, and all of them have a non-uniformity coefficient of 2.

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