Catalytic oxidation equipment and method in coking wastewater recycling process

Abstract

The invention discloses catalytic oxidation equipment and a catalytic oxidation method in a coking wastewater recycling process. The catalytic oxidation equipment comprises a base platform, a reaction mechanism, a pretreatment mechanism, a controller, a sedimentation tank, filter pressing equipment and storage equipment, the reaction mechanism is arranged on the rear side of the top end of the base platform; the pretreatment mechanism is arranged on the left side of the top end of the base platform; the sedimentation tank is arranged at the top end of the base platform and is positioned on the right front side of the reaction mechanism; the filter pressing equipment is arranged at the top end of the base platform and is positioned on the right side of the sedimentation tank. Emulsified oil is accurately captured through a special oil removal system, the pH is adjusted while the oil content of the wastewater is reduced, the basic condition adaptability of the subsequent catalytic oxidation reaction is greatly improved, and the mixing uniformity of the agent and the wastewater is improved by adopting a liquid agent multi-point adding technology and a solid agent gas-solid two-phase flow time sequence multi-point adding technology, so that the oil removal efficiency of the wastewater is improved. The problems of agent waste and insufficient reaction caused by overhigh local concentration are avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a catalytic oxidation device and method for a coking wastewater reuse process. Background Technology

[0002] Coking wastewater is a type of industrial wastewater with complex composition and high pollution intensity generated during the high-temperature dry distillation, gas purification, and coking product recovery of coal. Its water quality has significant unique characteristics. On the one hand, it contains high concentrations of recalcitrant organic matter, including phenols, benzene compounds, polycyclic aromatic hydrocarbons, and heterocyclic compounds. These substances have stable chemical structures, poor biodegradability, and some are even biotoxic. On the other hand, it also contains high concentrations of inorganic pollutants, such as ammonia nitrogen, cyanide, thiocyanate, and heavy metal ions. Furthermore, the wastewater exhibits large pH fluctuations, high temperatures, and is accompanied by oily substances and suspended solids. Direct discharge or reuse without effective treatment will not only severely pollute water bodies and soil, threatening aquatic life and human health, but also cause equipment corrosion and pipeline blockage during reuse due to substandard water quality, affecting the normal production of coking enterprises. In the existing technology field, coking wastewater after biological treatment still retains emulsified oil. When traditional processes directly enter the catalytic oxidation unit, a stable oil film forms on the liquid surface, hindering oxygen transfer. The oil film adsorbs hydroxyl radicals and encapsulates catalyst particles, affecting treatment efficiency. Furthermore, in the catalytic oxidation stage, existing processes often discharge ferrous sulfate and hydrogen peroxide directly into the reaction tank through a single pipe, forming a jet impact zone that results in excessively high local concentrations. Excessive ferrous sulfate in a localized area can cause quenching reactions between iron ions and hydroxyl radicals, while excessive hydrogen peroxide in a localized area can lead to ineffective decomposition. In addition, the traditional method of adding sodium hydroxide using a screw conveyor for direct feeding is prone to deliquescence and agglomeration, causing pipe blockage. Moreover, single-point addition creates a pH gradient in the reaction tank, resulting in inconsistent precipitate morphologies, with some forming colloids that are difficult to separate. Summary of the Invention

[0003] The purpose of this invention is to provide a catalytic oxidation device and method for coking wastewater reuse processes, so as to at least solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a catalytic oxidation device for coking wastewater reuse, comprising: Base platform; The reaction mechanism is located at the rear top of the base platform; A pretreatment mechanism is located on the top left side of the base platform; The controller is mounted on the top of the base platform and located to the right of the reaction mechanism; A sedimentation tank is located at the top of the base platform and to the right front of the reaction mechanism; A filter press is installed at the top of the base platform and on the right side of the sedimentation tank. The inlet pipe of the filter press extends into the inner cavity of the sedimentation tank. The filter press and the controller are electrically connected. A storage device is located at the top of the base platform and to the right front of the reaction mechanism. The liquid outlet of the filter press is connected to the liquid inlet of the storage device, and the storage device is electrically connected to the controller.

[0005] Preferably, the reaction mechanism includes: a reaction tank, a high-level platform, a liquid delivery machine, a solid delivery component, spray pipes, trusses, and a first stirring device; the reaction tank is installed on the rear side of the top of the base platform in a left-right direction, the liquid outlet pipe of the reaction tank extends into the inner cavity of the sedimentation tank, and the reaction tank and the controller are electrically connected; the high-level platform is installed on the top of the base platform and located on the right side of the reaction tank; the liquid delivery machine is installed on the front side of the top of the high-level platform, and the liquid delivery machine and the controller are electrically connected; the solid delivery component is located on the rear side of the top of the high-level platform; there are several spray pipes, which are installed at intervals from left to right at the top of the inner cavity of the reaction tank, and the spray pipes and the outlet of the liquid delivery machine are connected by pipes; there are several trusses, which are installed at intervals in a front-back direction at the top of the reaction tank; there are several first stirring devices, which are fixedly installed inside the several trusses, and the stirring paddle in the first stirring device extends into the inner cavity of the reaction tank, and the first stirring device and the controller are electrically connected.

[0006] Preferably, the solid feeding component includes: a housing shell, a solid conveying device, an axial flow fan, a conveying cylinder, a beam pipe, a connecting cover, a centrifugal fan, a connecting duct, a filter plate, a feeding channel, and a solenoid valve; the housing shell is installed at the rear top of the high-rise platform along the left-right direction; the solid conveying device is installed at the top of the housing shell, and the solid conveying device and the controller are electrically connected; the axial flow fan is installed inside the right opening of the housing shell, and the axial flow fan and the controller are electrically connected; the conveying cylinder is installed on the left side of the bottom of the inner cavity of the housing shell along the left-right direction via a bracket; the beam pipe is installed inside the right opening of the inner cavity of the conveying cylinder; the connecting cover is installed on the left side of the outlet of the axial flow fan, and the outlet of the connecting cover is connected to the inlet of the beam pipe; the centrifugal fan is installed on the front exterior of the housing shell. The centrifugal fan and controller are electrically connected; a connecting duct is installed at the bottom of the conveying cylinder and below the top feed inlet of the conveying cylinder, the top end of the connecting duct communicates with the inner cavity of the conveying cylinder, the front side of the connecting duct extends out of the outer shell of the housing and connects with the air outlet of the centrifugal fan; a filter plate is installed on the inner side of the top end of the connecting duct; a feeding channel is installed on the left side of the housing, the left end of the feeding channel extends to the top of the reaction tank, the right end of the feeding channel extends into the inner cavity of the housing and communicates with the left side of the inner cavity of the conveying cylinder; a solenoid valve is installed above the inner cavity of the top feed inlet of the conveying cylinder, the top feed inlet of the solenoid valve is connected to the bottom discharge outlet of the solid conveying device, and the solenoid valve and controller are electrically connected; wherein, discharge units are arranged at intervals from left to right inside the feeding channel.

[0007] Preferably, the outlet of the beam pipe is conical.

[0008] Preferably, the discharge unit includes: a limiting telescopic rod, a first electric telescopic rod, a U-shaped frame, a second electric telescopic rod, a rotating seat, a gear set, a miniature electric telescopic rod, a feeding trough, and a sealing plate; the number of the limiting telescopic rods is two, and the two limiting telescopic rods are respectively embedded inside the openings on the front and rear sides of the top of the feeding channel; the first electric telescopic rod is installed at the top of the feeding channel and located inside the front and rear limiting telescopic rods, the telescopic end of the first electric telescopic rod extends into the inner cavity of the feeding channel, and the first electric telescopic rod is electrically connected to the controller; the U-shaped frame is installed at the bottom of the telescopic end of the first electric telescopic rod, and the front and rear sides of the top of the U-shaped frame are respectively connected to the bottom of the telescopic ends of the front and rear limiting telescopic rods; the number of the second electric telescopic rods is two, and one end of each of the two second electric telescopic rods is rotatably connected to the top of the front and rear sides of the U-shaped frame through a rotating shaft, and the second electric telescopic rods are electrically connected to the controller. The system comprises two rotating seats, each rotatably connected to the front and rear ends of the inner side of the U-shaped frame via a rotating shaft. The shaft of each rotating seat extends outward from the U-shaped frame. Two gear sets are also included, with the lower gears of each gear set connected to the outer ends of the rotating seats via a key. The upper gears of each gear set are rotatably connected to the front and rear top ends of the U-shaped frame via a rotating shaft. The telescopic ends of the two second electric telescopic rods are rotatably connected to the outer sides of the upper gears of the front and rear gear sets via rotating shafts. Two miniature electric telescopic rods are also included, each installed inside the front and rear rotating seats. The miniature electric telescopic rods are electrically connected to the controller. A feeding trough is located at the bottom of the inner cavity of the feeding channel and below the U-shaped frame. A sealing plate is located inside the feeding trough, with the front and rear top ends of the feeding trough connected to the bottom of the telescopic ends of the two miniature electric telescopic rods.

[0009] Preferably, the pretreatment mechanism includes: a water tank shell, a partition, a connecting pipe, a feeding device, a second stirring device, a first pump body, a second pump body, a storage tank, a third pump body, and a buoyancy net cylinder; the water tank shell is installed on the top left side of the base platform in a front-rear direction; the partition is disposed in the inner cavity of the water tank shell, dividing the inner cavity of the water tank shell into front and rear parts; the connecting pipe is installed on the outer left front end of the water tank shell, and the connecting pipe is connected to the top left front of the front part of the inner cavity of the water tank shell; the feeding device is installed on the top left rear of the water tank shell, and the discharge port of the feeding device is connected to the feeding port at the top of the rear part of the inner cavity of the water tank shell, and the feeding device is electrically connected to the controller; the second stirring device is installed on the top of the water tank shell, and the stirring paddle of the second stirring device extends into the interior of the rear part of the inner cavity of the water tank shell, and the second stirring device is electrically connected to the controller; the first pump body is mounted on a bracket. The first pump body is installed on the outer rear side of the water tank shell. Its inlet is connected to the outlet of the rear portion of the inner cavity of the water tank shell, and its outlet pipe is connected to the inlet of the reaction tank. The first pump body and the controller are electrically connected. The second pump body is installed at the top of the water tank shell. Its inlet pipe extends into the front portion of the inner cavity of the water tank shell, and its outlet pipe extends into the rear portion of the inner cavity of the water tank shell. The second pump body and the controller are electrically connected. A storage tank is installed at the top right front of the water tank shell. A third pump body is installed at the top of the water tank shell and located to the right of the storage tank. Its inlet pipe extends into the front portion of the inner cavity of the water tank shell, and its outlet pipe is connected to the inlet of the storage tank. The third pump body and the controller are electrically connected. Two buoyancy nets are installed, one on the front and one on the rear of the inlet pipe of the third pump body.

[0010] A catalytic oxidation method for coking wastewater reuse includes the following steps: S1. Preprocessing: After biological treatment, the coking wastewater flows through a connecting pipe into the front area of ​​the pretreatment unit's water tank shell, and the relevant equipment is activated via a controller. Oil removal: The third pump body generates negative pressure and uses a buoyancy net to adsorb the oil film on the surface of the wastewater and transport it to the storage tank for separate storage, so as to avoid the oil film from hindering the subsequent reagent mixing and mass transfer; pH adjustment: The second pump pumps the oil-removed wastewater to the rear area of ​​the water tank shell. The feeding device adds sulfuric acid solution according to the preset dosage. The second stirring device continuously stirs to fully mix the solution with the wastewater and adjust the pH to 2-4. Wastewater transport: The first pump pumps the treated wastewater to the reaction tank of the reaction mechanism, where it will enter the catalytic oxidation stage; S2, catalytic oxidation: The catalytic oxidation is completed in three steps by starting the reaction-related equipment via a controller: Fenton reaction preparation: The temperature control equipment of the reaction tank is started to adjust the wastewater temperature to 20-40℃; the liquid delivery machine delivers ferrous sulfate solution to several spray pipes according to the preset flow rate, and sprays it evenly on the surface of the wastewater through the nozzles; the first stirring device stirs to make the solution and wastewater initially mixed. Fenton reaction start-up: The liquid delivery machine switches to hydrogen peroxide delivery mode, quantitatively delivering hydrogen peroxide to the spray pipe for uniform spraying. The first stirring device continuously stirs, promoting the reaction of hydrogen peroxide with ferrous ions to generate hydroxyl radicals, which degrade recalcitrant organic matter and reduce COD and toxicity. Neutralization and iron removal: The solid conveying device delivers sodium hydroxide powder to the solenoid valve according to the preset dosage. The powder falls onto the filter plate of the conveying cylinder. The centrifugal fan starts and blows the powder loose for a second before shutting off. The axial flow fan starts to form a high-speed airflow, which adsorbs and disperses the powder into a gas-solid two-phase flow and sends it into the feeding channel. The discharge unit in the feeding channel starts sequentially from right to left. Through the cooperation of the first electric telescopic rod, the second electric telescopic rod and the gear set, the sealing plate is tilted and a discharge gap is reserved, so that the gas-solid two-phase flow falls evenly into the reaction tank. The first stirring device continues to stir, so that sodium hydroxide and wastewater are mixed and the pH is adjusted to 8-9, so that ferrous ions are converted into ferric hydroxide flocculent precipitate. S3. Solid-liquid separation and purified water storage: Preliminary sedimentation: The mixed liquid in the reaction tank is discharged into the sedimentation tank through the outlet pipe and allowed to settle for 30-60 minutes; Deep separation: The controller starts the filter press equipment, extracts the supernatant from the sedimentation tank, and desludges it through the filter cloth to separate residual fine particles. The sludge is discharged through the sludge discharge port and sent to a professional hazardous waste treatment facility. Storage and reuse: Purified water is transported to a storage device for temporary storage through a filter press. The device monitors the water quality in real time and then transports it to the next treatment unit as needed.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. The oil film in the coking wastewater is drawn into the storage tank through the buoyancy net by the third pump. The second stirring device draws out the coking wastewater from the front part of the inner cavity of the tank and discharges it into the rear part of the inner cavity of the tank. The feeding device quantitatively adds sulfuric acid solution into the rear part of the inner cavity of the tank. The second stirring device stirs the sulfuric acid solution and coking wastewater in the rear part of the inner cavity of the tank to make them fully mixed, thereby adjusting the pH of the coking wastewater in the rear part of the inner cavity of the tank. The first pump draws out the treated coking wastewater in the rear part of the inner cavity of the tank and discharges it into the reaction tank.

[0012] 2. A liquid feeder sequentially and evenly sprays the internal ferrous sulfate solution and hydrogen peroxide onto the surface of the coking wastewater inside the reaction tank via spray pipes, avoiding localized over-dispensing. The first stirring device agitates the liquid inside the reaction tank to ensure thorough mixing. After the reaction, the solid conveying device quantitatively delivers the stored sodium hydroxide solid particles into the inner cavity of the conveying cylinder, where they fall onto the filter screen surface. A centrifugal fan generates a high-pressure airflow that blows the sodium hydroxide particles upwards from the filter screen surface. An axial flow fan generates a high-pressure airflow, which, under the beam of the converging pipe, produces a high-speed airflow that draws in the sodium hydroxide particles from inside the conveying cylinder and disperses them in the airflow, forming a uniform gas-solid two-phase flow before entering the feeding channel. The corresponding discharge unit shortens the U-shaped feeding channel. The frame moves upward, driving the lower sealing plate to detach from the inner cavity of the feeding trough. The second electric telescopic rods on the front and rear sides shorten, driving the upper gear of the gear set at the corresponding position to rotate. The gear below the gear set drives the rotating seat at the corresponding position to rotate the micro electric telescopic rod, so that the sealing plate is rotated to an inclined state through the micro electric telescopic rods on the front and rear sides. The micro electric telescopic rods shorten, driving the sealing plate to move to the left on the feeding trough to reserve the discharge position. The gas-solid two-phase flow impacts the surface of the sealing plate and is fed into the reaction tank through the lower feeding trough along the inclined surface formed by the sealing plate. The discharge unit is activated sequentially from right to left to achieve uniform feeding of sodium hydroxide. The first stirring device continues to stir to ensure a full reaction, thereby causing ferrous ions to form ferric hydroxide precipitate.

[0013] This allows for the precise capture of emulsified oil through a specialized oil removal system, reducing the oil content in wastewater while simultaneously adjusting the pH. This significantly improves the compatibility of the basic conditions for subsequent catalytic oxidation reactions. Furthermore, by employing multi-point dosing technology for liquid reagents and sequential multi-point dosing technology for solid reagents in a gas-solid two-phase flow, the uniformity of reagent mixing with wastewater is improved, avoiding problems such as reagent waste and incomplete reaction caused by excessively high local concentrations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Magnified view of the reaction mechanism; Figure 3 for Figure 2 Exploded view of the solid delivery component; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 for Figure 3 Enlarged view of point B; Figure 6 for Figure 1 Exploded view of the pretreatment facility.

[0015] In the diagram: 1. Base platform; 2. Reaction mechanism; 21. Reaction tank; 22. High-level platform; 23. Liquid delivery machine; 24. Spray pipe; 25. Truss; 26. First stirring device; 3. Solid delivery component; 31. Shell; 32. Solid conveying device; 33. Axial flow fan; 34. Conveying cylinder; 35. Flow duct; 36. Connecting cover; 37. Centrifugal fan; 38. Connecting air duct; 39. Filter plate; 310. Feeding channel; 311. Limiting telescopic rod; 312. First electric telescopic rod; 313. 314. U-shaped frame, 315. Second electric telescopic rod, 316. Rotating seat, 317. Gear set, 318. Miniature electric telescopic rod, 319. Feeding trough, 320. Sealing plate, 411. Solenoid valve, 42. Pretreatment mechanism, 43. Water tank shell, 44. Partition plate, 45. Connecting pipe, 46. Feeding device, 47. Second stirring device, 48. First pump body, 49. Second pump body, 40. Storage tank, 410. Third pump body, 5. Buoyancy net cylinder, 6. Controller, 7. Sedimentation tank, 8. Filter press equipment, 9. Storage equipment. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-6This invention provides a technical solution: a catalytic oxidation device for coking wastewater reuse, comprising: a base platform 1, a reaction mechanism 2, a pretreatment mechanism 4, a controller 5, a sedimentation tank 6, a filter press 7, and a storage device 8; the reaction mechanism 2 is located at the top rear side of the base platform 1; the pretreatment mechanism 4 is located at the top left side of the base platform 1; the controller 5 is installed at the top of the base platform 1 and located to the right of the reaction mechanism 2, the controller 5 adopts a PLC control cabinet, and achieves full-process automation through preset programs, eliminating the need for manual start-up of each device, and can display the operating status, water quality parameters, and liquid level of each device in real time; the sedimentation tank 6 is located at the top of the base platform 1 and to the right front of the reaction mechanism 2, the sedimentation tank 6 is an inclined tube sedimentation tank, filled with honeycomb inclined tubes, with a conical sludge collection hopper at the bottom, and equipped with an electric sludge discharge valve and a liquid level gauge, the sedimentation tank 6 receives the wastewater mixture discharged from the reaction tank 21, and utilizes the shallow sedimentation principle of the inclined tubes to significantly shorten the particle settling distance, allowing the ferric hydroxide flocs to quickly settle to the sludge collection hopper at the bottom of the tank, for subsequent filter press equipment. 7. To reduce the processing load, the sludge is temporarily stored in the sludge collection hopper. The controller 5, based on the sludge level feedback from the level gauge, opens the electric sludge discharge valve to coordinate with manual processing. The filter press 7 is located at the top of the base platform 1 and to the right of the sedimentation tank 6. The inlet pipe of the filter press 7 extends into the inner cavity of the sedimentation tank 6. The filter press 7 and the controller 5 are electrically connected. The filter press 7 integrates a pneumatic diaphragm pump and an automatic filter press. The pneumatic diaphragm pump pressurizes the liquid inside the sedimentation tank 6 and sends it into the filter plate chamber of the automatic filter press. The liquid passes through the filter cloth... To clarify the liquid, suspended solids are trapped and form a filter cake, which is then pressed to reduce the amount of sludge to be treated later. The storage device 8 is located at the top of the base platform 1 and to the right front of the reaction mechanism 2. The outlet pipe of the filter press 7 is connected to the inlet of the storage device 8. The storage device 8 is electrically connected to the controller 5. The storage device 8 is a vertical PE storage tank. A breather valve is installed on the top of the tank to prevent negative or overpressure inside the tank, and a manhole is provided for regular maintenance. A magnetic level gauge and a drain valve are installed on the side of the tank. Electric gate valves are installed at both the inlet and outlet.

[0018] As a preferred option, further, such as Figure 2As shown, the reaction mechanism 2 includes: a reaction tank 21, a high-level platform 22, a liquid delivery machine 23, a solid delivery component 3, a spray pipe 24, a truss 25, and a first stirring device 26. The reaction tank 21 is installed on the rear side of the top of the base platform 1 in a left-right direction. The outlet pipe of the reaction tank 21 extends into the inner cavity of the sedimentation tank 6. The reaction tank 21 is electrically connected to the controller 5. The reaction tank 21 is a corrosion-resistant reaction tank made of homopolymer polypropylene, which is resistant to strong acids and alkalis. It has a built-in temperature control system and is equipped with a temperature sensor. As the main container for the homogeneous Fenton reaction, it contains pretreated coking wastewater, ensuring that the wastewater is fully mixed and reacted with ferrous sulfate and hydrogen peroxide. A stainless steel outlet pipe with an electric valve is installed at the bottom of the tank. After the reaction, the mixture containing ferric hydroxide precipitate is automatically discharged into the sedimentation tank 6. The high-level platform 22 is installed at the top of the base platform 1 and located to the right of the reaction tank 21. The high-level platform 22 is a steel structure auxiliary platform, ensuring the equipment height matches the feeding requirements of the reaction tank 21. The platform has a reserved maintenance staircase passage, facilitating regular checks of the device's operating status, replenishment of reagents, or replacement of vulnerable parts by staff. The liquid delivery machine 23 is installed at the top front of the high-level platform 22. The liquid delivery machine 23 is electrically connected to the controller 5. The liquid delivery machine 23 uses a corrosion-resistant metering pump combined with a storage tank. The storage tank is made of PE material and stores ferrous sulfate solution and hydrogen peroxide separately to prevent premature mixing and reaction. The built-in level gauge provides real-time feedback on reagent levels and sends an alarm signal to the controller 5 when the level is low, reminding the user to replenish the reagent. A diaphragm metering pump is selected to precisely control the reagent dosage, preventing waste from excessive additions or insufficient additions that could lead to substandard treatment. The solid delivery component 3 is located at the top rear of the high-level platform 22. Several spray pipes 24 are installed at intervals from left to right at the top of the inner cavity of the reaction tank 21. The spray pipes 24 are connected to the outlet of the liquid delivery machine 23 via pipes. Each spray pipe 24 is a multi-nozzle pipe with multiple fan-shaped nozzles, evenly spraying the ferrous sulfate or hydrogen peroxide from the liquid delivery machine 23 onto the wastewater surface through the fan-shaped nozzles, avoiding single-dose spraying. Point dosing leads to excessively high local reagent concentrations; there are several trusses 25, which are installed at intervals along the front-to-back direction at the top of the reaction tank 21; there are several first stirring devices 26, which are fixedly installed inside the several trusses 25. The stirring paddle in the first stirring device 26 extends into the inner cavity of the reaction tank 21. The first stirring device 26 is electrically connected to the controller 5. The first stirring device 26 adopts a vertical stirrer with a propeller-type stirring paddle. The propeller-type stirring paddle generates axial flow, which drives the wastewater to circulate up and down, thereby providing the turbulent environment required for the Fenton reaction, so that the reagent and wastewater are fully mixed, ensuring that hydroxyl radicals come into contact with organic matter.

[0019] As a preferred option, further, such as Figure 3 , Figure 4 and Figure 5As shown, the solid feeding component 3 includes: a housing 31, a solid conveying device 32, an axial flow fan 33, a conveying cylinder 34, a convection pipe 35, a connecting cover 36, a centrifugal fan 37, a connecting air duct 38, a filter plate 39, a feeding channel 310, and a solenoid valve 320. The housing 31 is installed on the rear top of the high-rise platform 22 along the left-right direction. The solid conveying device 32 is installed on the top of the housing 31 and is electrically connected to the controller 5. The solid conveying device 32 uses a hopper and a screw conveyor to quantitatively convey sodium hydroxide solid particles from the hopper to the solenoid valve 320. The controller 5 adjusts the motor speed to achieve precise control of the feeding amount. The axial flow fan 33 is installed inside the opening on the right side of the housing 31. The axial flow fan 33 and controller 5 are electrically connected. The axial flow fan 33 is a corrosion-resistant axial flow fan, which generates high-pressure airflow that enters the beam duct 35 through the connecting cover 36, forming a high-speed airflow field to provide conveying power for the sodium hydroxide particles. The conveying cylinder 34 is installed on the left side of the bottom of the inner cavity of the housing shell 31 along the left-right direction via a bracket. The conveying cylinder 34 serves as a temporary storage and mixing chamber for the sodium hydroxide particles. The inner wall is mirror-polished to reduce powder adhesion and accumulation. The beam duct 35 is installed inside the opening on the right side of the inner cavity of the conveying cylinder 34. The outlet of the beam duct 35 is conical. The beam duct 35 accelerates the airflow from the axial flow fan 33 and uses the Venturi effect to generate negative pressure at the outlet, drawing the sodium hydroxide particles from the conveying cylinder 34 into the air. The airflow is dispersed to form a uniform gas-solid two-phase flow. A connecting hood 36 is installed on the left side of the outlet of the axial flow fan 33. The outlet of the connecting hood 36 is connected to the inlet of the beam duct 35. The connecting hood 36 has a tapered flared shape, connecting the axial flow fan 33 and the beam duct 35, reducing airflow resistance loss, and simultaneously rectifying the airflow to ensure uniform and stable airflow entering the beam duct 35. A centrifugal fan 37 is installed on the front exterior of the housing 31. The centrifugal fan 37 is electrically connected to the controller 5. The centrifugal fan 37 generates high-pressure airflow that enters the conveying cylinder 34 through the connecting duct 38, blowing up and loosening the sodium hydroxide particles on the filter plate 39 to prevent clumping and bridging, preparing for subsequent conveying by the axial flow fan 33. The connecting duct 38 is installed on the conveying cylinder. The bottom of body 34 is located below the top feed inlet of conveying cylinder 34. The top end of connecting air duct 38 communicates with the inner cavity of conveying cylinder 34. The front side of connecting air duct 38 extends out of the outer shell 31 of the box and connects to the air outlet of centrifugal fan 37. Filter plate 39 is installed on the inner side of the top end of connecting air duct 38. Filter plate 39 supports sodium hydroxide particles, allows airflow from centrifugal fan 37 to pass through, and prevents large particles that have not been blown away from entering the airflow system. Filter plate 39 is removable for cleaning. Feeding channel 310 is installed on the left side of outer shell 31 of the box. The left end of feeding channel 310 extends to the top of reaction tank 21, and the right end of feeding channel 310 extends into the inner cavity of outer shell 31 of the box and communicates with the left side of the inner cavity of conveying cylinder 34.Solenoid valve 320 is installed above the inner cavity of the top feed inlet of conveying cylinder 34. The top feed inlet of solenoid valve 320 is connected to the bottom discharge outlet of solid conveying device 32. Solenoid valve 320 is electrically connected to controller 5. Solenoid valve 320 controls the opening and closing of the material channel between solid conveying device 32 and conveying cylinder 34. Controller 5 precisely controls the opening time according to the required feeding amount. The feeding channel 310 has discharge units spaced from left to right. Each discharge unit includes: a limiting telescopic rod 311, a first electric telescopic rod 312, a U-shaped frame 313, a second electric telescopic rod 314, a rotating seat 315, a gear set 316, a miniature electric telescopic rod 317, a feeding trough 318, and a sealing plate 319. The number of limiting telescopic rods 311 is... There are two limiting telescopic rods 311, which are respectively embedded inside the openings on the front and rear sides of the top of the feeding channel 310. The first electric telescopic rod 312 is installed at the top of the feeding channel 310 and is located inside the front and rear limiting telescopic rods 311. The telescopic end of the first electric telescopic rod 312 extends into the inner cavity of the feeding channel 310. The first electric telescopic rod 312 is electrically connected to the controller 5. The first electric telescopic rod 312 drives the U-shaped frame 313 to move up and down by its own extension and retraction, so as to realize the separation and contact between the sealing plate 319 and the feeding trough 318. It is equipped with a position sensor, which can provide real-time feedback of the telescopic position to the controller 5. The U-shaped frame 313 is installed at the bottom of the telescopic end of the first electric telescopic rod 312. The front and rear sides of the top of the U-shaped frame 313 are respectively connected to the front and rear... The bottom ends of the two limiting telescopic rods 311 are connected together; there are two second electric telescopic rods 314, one end of which is rotatably connected to the front and rear top ends of the U-shaped frame 313 via a rotating shaft. The second electric telescopic rods 314 are electrically connected to the controller 5. The second electric telescopic rods 314 drive the gear set 316 to rotate through the telescopic movement, thereby controlling the rotation angle of the rotating seat 315 and realizing the tilt angle adjustment of the sealing plate 319; there are two rotating seats 315, which are rotatably connected to the front and rear ends of the inner side of the U-shaped frame 313 via a rotating shaft. The axis of the rotating seat 315 extends out of the U-shaped frame 313; there are two gear sets 316, with gear keys below the two gear sets 316. The upper gears of the two gear sets 316 are rotatably connected to the front and rear top ends of the U-shaped frame 313 via a rotating shaft, and the telescopic ends of the two second electric telescopic rods 314 are rotatably connected to the outer sides of the upper gears of the front and rear gear sets 316 via a rotating shaft; there are two miniature electric telescopic rods 317, which are installed on the inner sides of the front and rear rotating seats 315 respectively. The miniature electric telescopic rods 317 are electrically connected to the controller 5. The miniature electric telescopic rods 317 drive the sealing plate 319 to move horizontally by extending and shortening themselves, thereby adjusting the size of the discharge port and controlling the amount of sodium hydroxide granules added; the feeding trough 318 is opened at the bottom of the inner cavity of the feeding channel 310 and is located below the U-shaped frame 313;A sealing plate 319 is disposed inside the feeding trough 318, and the top front and rear sides of the feeding trough 318 are respectively connected to the bottom of the telescopic ends of two miniature electric telescopic rods 317.

[0020] As a preferred option, further, such as Figure 6As shown, the pretreatment mechanism 4 includes: a water tank shell 41, a partition 42, a connecting pipe 43, a feeding device 44, a second stirring device 45, a first pump body 46, a second pump body 47, a storage tank 48, a third pump body 49, and a buoyancy net cylinder 410; the water tank shell 41 is installed on the top left side of the base platform 1 along the front-to-back direction, and a water tank level gauge and a pH sensor are installed inside the water tank shell 41 as needed; the partition 42 is set in the inner cavity of the water tank shell 41, dividing the inner cavity of the water tank shell 41 into front and rear parts, so that the front part of the water tank shell 41 focuses on oil removal to avoid the oil film affecting the mass transfer of the Fenton reaction, and the rear part focuses on pH adjustment to precisely control the acidic environment and realize the optimized process of first removing impurities and then adjusting parameters; the connecting pipe 43 is installed in the water tank shell 41. The connecting pipe 43 is located on the front left side of the outer shell 41 and connects to the top left front of the inner cavity of the front part of the outer shell 41. The connecting pipe 43 is connected to external equipment and equipped with a PVC ball valve to introduce the biologically treated coking wastewater into the front cavity of the outer shell 41. The water level is controlled by adjusting the inlet flow rate through the ball valve to prevent the tank from overflowing or running out of water. The feeding device 44 is installed at the top left rear of the outer shell 41. The outlet of the feeding device 44 is connected to the feeding port at the top rear of the inner cavity of the outer shell 41. The feeding device 44 is electrically connected to the controller 5. The feeding device 44 is a combination of a storage tank and a metering pump. The storage tank is made of FRP material and has a sealed cover to prevent sulfuric acid from volatilizing and generating acid mist. It has a built-in corrosion-resistant level gauge. The metering pump is a plunger-type metering pump resistant to concentrated sulfuric acid corrosion. The pump, a metering pump, automatically adjusts the dosage based on pH feedback; the second stirring device 45 is installed at the top of the water tank shell 41, and the stirring paddle of the second stirring device 45 extends into the rear part of the inner cavity of the water tank shell 41. The second stirring device 45 is electrically connected to the controller 5. The second stirring device 45 is a vertical stirrer with an anchor-type stirring paddle that fits against the bottom of the rear cavity of the water tank, driving the flow of wastewater throughout the cavity. This adapts to the flat structure of the rear part of the water tank, preventing local accumulation of sulfuric acid that could lead to uneven pH; the first pump body 46 is installed on the rear side of the water tank shell 41 via a bracket. The inlet of the first pump body 46 is connected to the outlet of the rear part of the inner cavity of the water tank shell 41, and the outlet pipe of the first pump body 46 is connected to the inlet of the reaction tank 21. The first pump body 46 is electrically connected to the controller 5. The first pump body 46 is a corrosion-resistant centrifugal pump with a built-in frequency converter. It transports the wastewater after oil removal and pH adjustment in the rear part of the water tank shell 41 to the reaction tank 21. The frequency converter automatically adjusts the pump speed according to the liquid level in the reaction tank 21 to avoid overflow or emptying of the reaction tank 21. The second pump body 47 is installed at the top of the water tank shell 41. The inlet pipe of the second pump body 47 extends into the front part of the inner cavity of the water tank shell 41, and the outlet pipe of the second pump body 47 extends into the rear part of the inner cavity of the water tank shell 41. The second pump body 47 is electrically connected to the controller 5. The second pump body 47 is a corrosion-resistant centrifugal pump with a low head setting. It pumps the wastewater after oil removal in the front part of the water tank shell 41 to the rear part and avoids excessive water flow impact and foaming caused by high head.The storage tank 48 is installed at the top right front of the water tank shell 41. The storage tank 48 is equipped with a manual drain valve and stores the oil film sucked in by the third pump body 49, preventing the oil film from flowing back into the wastewater system. When the oil residue in the storage tank accumulates to a threshold, it is discharged through the manual drain valve and transported to a professional institution for treatment to prevent the oil residue from deteriorating. The third pump body 49 is installed at the top of the water tank shell 41 and located to the right of the storage tank 48. The inlet pipe of the third pump body 49 extends into the front part of the inner cavity of the water tank shell 41, and the outlet pipe of the third pump body 49 is connected to the inlet of the storage tank 48. The third pump body 49 is electrically connected to the controller 5 and is self-priming. The centrifugal pump is equipped with an anti-clogging filter to prevent large impurities from entering the pump body. It utilizes a self-priming function to generate negative pressure, adsorbing the oil film on the surface of the water tank's front chamber through a buoyancy mesh cylinder 410, and then transporting it to the storage tank 48. Two buoyancy mesh cylinders 410 are used, installed on the front and rear sides of the inlet pipe of the third pump body 49, respectively. Each buoyancy mesh cylinder 410 has an outer layer of oleophilic-hydrophobic membrane, allowing it to float on the wastewater surface. The oleophilic-hydrophobic membrane only adsorbs oil and not water, ensuring high purity of the pumped oil film. The buoyancy mesh cylinder 410 is detachable, allowing for periodic removal and high-pressure water rinsing to remove surface impurities and restore adsorption efficiency.

[0021] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, and the specific work is as follows: Step 1: The coking wastewater after biological treatment flows automatically into the front area of ​​the inner cavity of the water tank shell 41 of the pretreatment mechanism 4 along the connecting pipe 43. The operator controls the controller 5 to start the third pump 49, the second stirring device 45, the feeding device 44, the second stirring device 45 and the first pump 46. The third pump 49 generates negative pressure, which sucks the oil film in the wastewater in the front area through the buoyancy net cylinder 410 and finally transports it to the storage tank 48 for separate storage and unified treatment of oil residue, thereby preventing the oil film from covering the wastewater surface and hindering the subsequent reagent mixing and mass transfer. The second pump 47 pumps the wastewater after oil removal in the front area to the rear area of ​​the water tank shell 41. The second stirring device 45 continuously stirs to fully mix the sulfuric acid and wastewater and adjust the pH of the wastewater in the rear area to 2-4. The first pump 46 pumps the qualified wastewater after oil removal and pH adjustment to the reaction tank 21 of the reaction mechanism 2, waiting to enter the catalytic oxidation stage. Step 2: The operator starts the liquid delivery machine 23, reaction tank 21, and first stirring device 26 via controller 5, activating the relevant equipment in sequence. The temperature control device built into the reaction tank 21 is activated, adjusting the wastewater temperature to 20-40℃. This temperature range balances the reaction rate and hydrogen peroxide utilization. The liquid delivery machine 23 pre-stores ferrous sulfate solution and delivers it to several spaced spray pipes 24 at a preset flow rate. The spray pipes 24, through multiple nozzles, evenly spray the ferrous sulfate solution onto the wastewater surface, avoiding single-point addition that could lead to problems. When the local ferrous ion concentration is too high, the first stirring device 26 stirs the liquid inside the reaction tank 21 to make it fully mixed. After the ferrous sulfate solution and wastewater are initially mixed, the liquid delivery machine 23 switches to the hydrogen peroxide delivery mode and delivers the pre-stored hydrogen peroxide quantitatively to the spray pipe 24. Similarly, it is sprayed evenly through multiple sets of nozzles. The first stirring device 26 continues to stir. The hydroxyl radicals generated by the rapid reaction of hydrogen peroxide and ferrous ions under acidic conditions can efficiently degrade polycyclic aromatic hydrocarbons, heterocyclic compounds and other difficult-to-degrade organic matter in coking wastewater, and reduce COD and toxicity. Step 3: After the reaction is complete, the operator activates the solid conveying device 32, solenoid valve 320, centrifugal fan 37, axial fan 33, feeding channel 310, second electric telescopic rod 314, and miniature electric telescopic rod 317 via controller 5. Dry sodium hydroxide powder stored in the solid conveying device 32 is conveyed to the solenoid valve 320 according to a preset dosage. The solenoid valve 320 opens, and the powder falls into the conveying cylinder 34 and onto the filter plate 39 at the bottom. The solenoid valve 320 closes, and the centrifugal fan 37 generates... High-pressure airflow enters the conveying cylinder 34 through the connecting duct 38, blowing the sodium hydroxide powder on the filter plate 39 upwards to loosen the powder and prevent clumping. After 10-15 seconds, the centrifugal fan 37 is turned off, and the axial flow fan 33 starts simultaneously. The resulting high-pressure airflow enters the beam pipe 35 through the connecting cover 36, forming a high-speed airflow. The high-speed airflow generates negative pressure inside the conveying cylinder 34, drawing in the loosened sodium hydroxide powder and dispersing it in the airflow, forming a gas-solid two-phase flow. Subsequently, the two-phase flow enters the feeding channel 310. The discharge unit in 10 is activated sequentially from right to left. The first electric telescopic rod 312 shortens, causing the U-shaped frame 313 to move upward under the constraint of the limiting telescopic rod 311, thereby pulling the lower sealing plate 319 away from the feeding trough 318 and releasing the sealing state of the feeding trough 318. The second electric telescopic rods 314 on the front and rear sides shorten, driving the upper gear of the corresponding gear set 316 to rotate, driving the lower gear and the rotating seat 315 to rotate, so that the miniature electric telescopic rod 317 connected to the rotating seat 315 and the sealing plate 319 are activated. The sealing plate 319 rotates to an inclined state, the micro electric telescopic rod 317 shortens, and pulls the sealing plate 319 to move to the left on the feeding trough 318, leaving a discharge gap; the gas-solid two-phase flow impacts the inclined sealing plate 319, slides into the feeding trough 318 along the inclined surface, and finally falls evenly into the reaction tank 21. The first stirring device 26 continues to stir to fully mix sodium hydroxide with wastewater and adjust the pH to 8-9: at this time, ferrous ions are completely converted into ferric hydroxide flocculent precipitate, while neutralizing the acidic substances in the wastewater; Step 4: After the catalytic oxidation stage, the mixed liquid in reaction tank 21 is discharged into sedimentation tank 6 through the bottom outlet pipe for preliminary settling. The staff starts the filter press 7 and storage device 8 through the controller 5. The filter press 7 extracts the supernatant after preliminary settling and filters it through the internal filter cloth to remove sludge, separating the fine iron hydroxide particles remaining in the supernatant to ensure that the effluent is clear. The separated sludge is discharged through the sludge discharge port of the filter press 7, collected and transported to a professional hazardous waste treatment facility for disposal. The separated purified water is transported to the storage device 8 through the outlet pipe of the filter press for temporary storage. The storage device 8 will monitor the water quality in real time and will then be transported to the next treatment unit according to the reuse requirements.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A catalytic oxidation device for coking wastewater reuse, characterized in that, include: Base platform (1); The reaction mechanism (2) is located on the rear side of the top of the base platform (1); The pretreatment mechanism (4) is located on the top left side of the base platform (1); The controller (5) is installed at the top of the base platform (1) and located to the right of the reaction mechanism (2); The sedimentation tank (6) is located at the top of the base platform (1) and to the right front of the reaction mechanism (2); A filter press (7) is set at the top of the base platform (1) and located on the right side of the sedimentation tank (6). The inlet pipe of the filter press (7) extends into the inner cavity of the sedimentation tank (6). The filter press (7) and the controller (5) are electrically connected. The storage device (8) is located at the top of the base platform (1) and in front of the right side of the reaction mechanism (2). The outlet pipe of the filter press (7) is connected to the inlet of the storage device (8). The storage device (8) is electrically connected to the controller (5).

2. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 1, characterized in that, The reaction mechanism (2) includes: The reaction tank (21) is installed on the rear side of the top of the base platform (1) in the left-right direction. The liquid outlet pipe of the reaction tank (21) extends into the inner cavity of the sedimentation tank (6). The reaction tank (21) and the controller (5) are electrically connected. The high-level platform (22) is installed at the top of the base platform (1) and located to the right of the reaction tank (21); A liquid delivery machine (23) is installed on the front side of the top of the high-rise platform (22), and the liquid delivery machine (23) is electrically connected to the controller (5); Solid delivery component (3) is located at the rear top of the high-rise platform (22); Spray pipe (24), the number of spray pipes (24) is several, and several spray pipes (24) are installed at intervals from left to right at the top of the inner cavity of the reaction tank (21). The spray pipes (24) and the discharge port of the liquid delivery machine (23) are connected by pipes. A truss (25), the number of which is several, and several of the trusses (25) are installed at intervals along the front-back direction at the top of the reaction tank (21); The first stirring device (26) is a plurality of the first stirring devices (26), and the plurality of the first stirring devices (26) are fixedly installed inside the plurality of trusses (25). The stirring paddle in the first stirring device (26) extends into the inner cavity of the reaction tank (21). The first stirring device (26) and the controller (5) are electrically connected.

3. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 2, characterized in that, The solid delivery component (3) includes: The outer casing (31) is installed on the rear top of the high-rise platform (22) in the left-right direction; A solid conveying device (32) is installed on the top of the outer shell (31) of the box, and the solid conveying device (32) is electrically connected to the controller (5); An axial flow fan (33) is installed inside the right opening of the housing (31), and the axial flow fan (33) is electrically connected to the controller (5); The conveying cylinder (34) is installed on the left side of the bottom of the inner cavity of the outer shell (31) of the box along the left and right direction via a bracket; The beam pipe (35) is installed inside the opening on the right side of the inner cavity of the conveying cylinder (34); A connecting cover (36) is installed on the left side of the air outlet of the axial flow fan (33), and the outlet of the connecting cover (36) is connected to the inlet of the beam pipe (35); A centrifugal fan (37) is installed on the front side of the outer casing (31) of the housing, and the centrifugal fan (37) is electrically connected to the controller (5).

4. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 3, characterized in that, The solid delivery component (3) also includes: A connecting air duct (38) is installed at the bottom of the conveying cylinder (34) and located below the top feed inlet of the conveying cylinder (34). The top end of the connecting air duct (38) communicates with the inner cavity of the conveying cylinder (34). The front side of the connecting air duct (38) extends out of the outer shell (31) of the box and connects to the air outlet of the centrifugal fan (37). A filter screen (39) is installed on the inner side of the top of the connecting air duct (38); Feeding channel (310) is installed on the left side of the outer shell (31) of the box. The left end of the feeding channel (310) extends to the top of the reaction tank (21), and the right end of the feeding channel (310) extends into the inner cavity of the outer shell (31) and is connected to the left side of the inner cavity of the conveying cylinder (34). The solenoid valve (320) is installed above the inner cavity of the top feed inlet of the conveying cylinder (34). The top feed inlet of the solenoid valve (320) is connected to the bottom discharge port of the solid conveying device (32). The solenoid valve (320) and the controller (5) are electrically connected. The feeding channel (310) is provided with discharge units spaced from left to right inside.

5. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 4, characterized in that, The outlet of the beam pipe (35) is conical.

6. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 5, characterized in that, The discharge unit includes: Limiting telescopic rods (311), the number of the limiting telescopic rods (311) is two, and the two limiting telescopic rods (311) are respectively embedded in the openings on the front and rear sides of the top of the feeding channel (310); The first electric telescopic rod (312) is installed at the top of the feeding channel (310) and located inside the front and rear limiting telescopic rods (311). The telescopic end of the first electric telescopic rod (312) extends into the inner cavity of the feeding channel (310). The first electric telescopic rod (312) is electrically connected to the controller (5). The U-shaped frame (313) is installed at the bottom of the telescopic end of the first electric telescopic rod (312), and the top front and rear sides of the U-shaped frame (313) are respectively connected to the bottom of the telescopic ends of the front and rear limit telescopic rods (311). The second electric telescopic rod (314) has two parts. One end of each of the two electric telescopic rods (314) is rotatably connected to the top of the front and rear sides of the U-shaped frame (313) through a rotating shaft. The second electric telescopic rod (314) is electrically connected to the controller (5). Rotary seat (315), there are two rotating seats (315), and the two rotating seats (315) are respectively rotatably connected to the front and rear ends of the inner side of the U-shaped frame (313) through a rotating shaft. The axis of the rotating seat (315) extends out of the U-shaped frame (313). The gear set (316) consists of two gear sets (316). The gear keys of the two gear sets (316) are connected to the outer end of the shaft of the rotating seat (315). The upper gears of the two gear sets (316) are rotatably connected to the top of the front and rear sides of the U-shaped frame (313) through a rotating shaft. The telescopic ends of the two second electric telescopic rods (314) are respectively rotatably connected to the outer side of the upper gears of the front and rear gear sets (316) through a rotating shaft. The miniature electric telescopic rod (317) has two components. The two miniature electric telescopic rods (317) are respectively installed on the inner side of the front and rear rotating seats (315). The miniature electric telescopic rod (317) is electrically connected to the controller (5). The feeding trough (318) is located at the bottom of the inner cavity of the feeding channel (310) and below the U-shaped frame (313); A sealing plate (319) is provided on the inner side of the feeding trough (318), and the top front and rear sides of the feeding trough (318) are respectively connected to the bottom of the telescopic ends of two miniature electric telescopic rods (317).

7. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 6, characterized in that, The pretreatment mechanism (4) includes: The water tank shell (41) is installed on the top left side of the base platform (1) in the front-rear direction; A partition (42) is provided in the inner cavity of the water tank shell (41), and the partition (42) divides the inner cavity of the water tank shell (41) into front and rear parts; A connecting pipe (43) is installed on the outer left front end of the water tank shell (41), and the connecting pipe (43) is connected to the top left front of the inner cavity of the front part of the water tank shell (41); Feeding device (44) is installed at the top left rear of the water tank shell (41). The outlet of the feeding device (44) is connected to the feeding port at the top of the rear part of the inner cavity of the water tank shell (41). The feeding device (44) and the controller (5) are electrically connected. The second stirring device (45) is installed at the top of the water tank shell (41). The stirring paddle of the second stirring device (45) extends into the rear part of the inner cavity of the water tank shell (41). The second stirring device (45) and the controller (5) are electrically connected.

8. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 7, characterized in that, The pretreatment mechanism (4) further includes: The first pump body (46) is mounted on the rear side of the outer shell (41) of the water tank by a bracket. The inlet of the first pump body (46) is connected to the outlet of the rear part of the inner cavity of the water tank shell (41). The outlet pipe of the first pump body (46) is connected to the inlet of the reaction tank (21). The first pump body (46) and the controller (5) are electrically connected. The second pump body (47) is installed at the top of the water tank shell (41). The inlet pipe of the second pump body (47) extends into the front part of the inner cavity of the water tank shell (41), and the outlet pipe of the second pump body (47) extends into the rear part of the inner cavity of the water tank shell (41). The second pump body (47) and the controller (5) are electrically connected. The liquid storage tank (48) is installed at the top right front of the outer shell of the water tank (41); The third pump body (49) is installed at the top of the water tank shell (41) and located on the right side of the storage tank (48). The inlet pipe of the third pump body (49) extends into the front part of the inner cavity of the water tank shell (41). The outlet pipe of the third pump body (49) is connected to the inlet of the storage tank (48). The third pump body (49) and the controller (5) are electrically connected. Two buoyancy net cylinders (410) are installed on the front and rear sides of the inlet pipe of the third pump body (49), respectively.

9. A catalytic oxidation method for coking wastewater reuse, applied in a catalytic oxidation device for coking wastewater reuse as described in claim 8, characterized in that, The steps are as follows: S1. Preprocessing: After biological treatment, the coking wastewater flows through the connecting pipe (43) into the front area of ​​the water tank shell (41) of the pretreatment unit (4), and the relevant equipment is started by the controller (5): Oil removal: The third pump body (49) generates negative pressure and uses the buoyancy net cylinder (410) to adsorb the oil film on the surface of the wastewater and transport it to the storage tank (48) for separate storage to avoid the oil film from hindering the subsequent reagent mixing and mass transfer; pH adjustment: The second pump (47) pumps the degreased wastewater to the area behind the tank shell (41), the feeding device (44) adds sulfuric acid solution according to the preset dosage, and the second stirring device (45) continuously stirs to fully mix the solution with the wastewater and adjust the pH to 2-4. Wastewater transport: The first pump (46) pumps the treated wastewater to the reaction tank (21) of the reaction mechanism (2) for catalytic oxidation. S2, catalytic oxidation: The reaction-related equipment is started by the controller (5), and the catalytic oxidation is completed in three steps: Fenton reaction preparation: The temperature control equipment of the reaction tank (21) is started to adjust the wastewater temperature to 20-40℃; the liquid delivery machine (23) delivers ferrous sulfate solution to several spray pipes (24) according to the preset flow rate, and sprays it evenly on the surface of the wastewater through the nozzles; the first stirring device (26) stirs to make the solution and wastewater initially mixed. Fenton reaction start-up: The liquid delivery machine (23) switches to hydrogen peroxide delivery mode and delivers hydrogen peroxide quantitatively to the spray pipe (24) for uniform spraying. The first stirring device (26) continuously stirs, which promotes the reaction of hydrogen peroxide and ferrous ions to generate hydroxyl radicals, degrades recalcitrant organic matter and reduces COD and toxicity. Neutralization and iron removal: The solid conveying device (32) conveys sodium hydroxide powder to the solenoid valve (320) according to the preset dosage. The powder falls onto the filter plate (39) of the conveying cylinder (34). The centrifugal fan (37) starts for 10-15 seconds to loosen the powder and then shuts off. The axial flow fan (33) starts to form a high-speed airflow, which adsorbs and disperses the powder into a gas-solid two-phase flow and sends it into the feeding channel (310). The discharge unit in the feeding channel (310) starts from right to left. Through the cooperation of the first electric telescopic rod (312), the second electric telescopic rod (314) and the gear set (316), the sealing plate (319) is tilted and a discharge gap is reserved, so that the gas-solid two-phase flow falls evenly into the reaction tank (21). The first stirring device (26) continues to stir, so that the sodium hydroxide and wastewater are mixed and the pH is adjusted to 8-9, so that the ferrous ions are converted into ferric hydroxide flocculent precipitate. S3. Solid-liquid separation and purified water storage: Preliminary sedimentation: The mixed liquid in the reaction tank (21) is discharged into the sedimentation tank (6) through the outlet pipe and allowed to settle for 30-60 minutes; Deep separation: The controller (5) starts the filter press (7), extracts the supernatant from the sedimentation tank (6), and desludges it through the filter cloth to separate the residual fine particles. The sludge is discharged through the sludge discharge port and sent to a professional hazardous waste treatment institution. Storage and reuse: The purified water is transported to the storage device (8) through the filter press (7) for temporary storage. The device monitors the water quality in real time and then transports it to the next treatment unit as needed.

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