Internal circulation rotating impingement flow electrocatalytic device and method for treating organic wastewater

Abstract

The present invention discloses an internal circulation rotating impinging flow electrocatalytic device and method for treating organic wastewater, which belongs to the technical field of sewage treatment equipment. The upper part of the inner cavity of the electrochemical reactor of the device is an electrochemical reaction zone, and the lower part is a vortex generating zone; the electrochemical reaction zone includes an outer ring anode, an annular mesh cathode, an inner ring anode and a central fixed shaft coaxially sleeved from the outside to the inside, and the vortex generating zone includes an inner spiral generator and an outer spiral generator sleeved on the spiral central shaft. The present invention combines the impinging flow technology with the electrocatalytic technology, and utilizes the vortex generating zone to realize the efficient treatment of organic wastewater by the internal circulation impinging flow, which has the advantages of high treatment efficiency, small footprint, low operating energy consumption, etc. It can solve the problem of bubble adhesion on the electrode surface, and form strong turbulence through impact, reduce the reaction dead zone, and strengthen the mass transfer in the electrochemical degradation device, so as to achieve the purpose of automatic operation and efficient degradation.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to an internal circulation rotating impact flow electrocatalytic device and method for treating organic wastewater. Background Art

[0002] Industrial wastewater often has complex composition and poor biodegradability, which can easily inhibit the growth of microorganisms, making it difficult to treat using conventional biochemical methods.

[0003] Over the past few decades, electrochemical technology has emerged as a solution to many environmental challenges due to its versatility, high efficiency, cost-effectiveness, automation, and ease of cleaning. The advantage of electrochemical oxidation technology for treating organic wastewater is that the electrons driving the electrochemical process are the cheapest and most readily available redox agents. Therefore, no additional reagents are required during the oxidation process, significantly reducing the potential for secondary pollution and highlighting its good environmental compatibility.

[0004] However, the current flow field distribution inside the electrochemical reactor is not uniform, and the turbulence is weak, which is not conducive to the oxidation and degradation of pollutants. In addition, the mass transfer efficiency and electrical conductivity of the electrode surface are low, resulting in low current efficiency and high energy consumption in the electrochemical process. At the same time, the problem of bubble curtains generated by the oxygen and hydrogen evolution reactions gathering on the electrode surface during the reaction process is difficult to be effectively solved. Targeted and reasonable design of reactors is one of the important ways to improve the current efficiency of the electrochemical reaction process, reduce costs and solve the problem of bubble aggregation. Therefore, how to design a new type of electrochemical reactor to achieve efficient mass transfer, reduce reaction dead zones, and eliminate bubble attachment on the electrode surface is the key to the application of electrochemical technology in actual complex industrial wastewater. Summary of the Invention

[0005] The present invention aims to address the problems of low wastewater degradation efficiency in existing electrochemical degradation equipment, such as bubbles adhering to the electrode surfaces and inefficient mass transfer within the equipment. The invention also provides an internal-circulation rotating impinging flow electrocatalytic device and method for treating organic wastewater. Targeting high-concentration organic wastewater, the present invention combines impinging flow technology with electrocatalytic technology, utilizing a swirl-generating device to achieve internal-circulation impinging flow. This device has the advantages of high treatment efficiency, small footprint, and low operating energy consumption. It can address the problem of bubble adhesion on the electrode surfaces, create strong turbulence through impact, reduce reaction dead zones, and enhance mass transfer within the electrochemical degradation device, achieving automated operation and efficient degradation.

[0006] The specific technical solutions adopted in the present invention are as follows:

[0007] In a first aspect, the present invention provides an internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater, comprising an electrochemical reactor, an inlet liquid storage tank, an outlet liquid storage tank, a water quality monitoring device, a power supply device, and a gas storage tank;

[0008] The electrochemical reactor is a cylindrical structure with a closed inner cavity, the upper portion of which is an electrochemical reaction zone and the lower portion is a vortex generation zone; the electrochemical reaction zone includes an outer ring anode, an annular mesh cathode, an inner ring anode, and a central fixed axis, which are coaxially arranged from the outside to the inside. The annular region between the outer ring anode and the mesh cathode constitutes the outer reaction zone, and the annular region between the mesh cathode and the inner ring anode constitutes the inner reaction zone. The outer and inner reaction zones are connected above and below; the outer ring anode, the annular mesh cathode, and the inner ring anode are all connected to a power supply device in a separately controlled manner;

[0009] The vortex generating area includes an inner spiral generator and an outer spiral generator sleeved on a spiral central shaft, and the spiral central shaft is coaxially connected to the bottom of the central fixed shaft; the inner spiral generator is located below the inner reaction area, and the outer spiral generator is located below the outer reaction area, and the inner and outer spiral generators are respectively connected to the spiral central shaft via spiral gears; the spiral central shaft is driven to rotate by a driving device, which can drive the two spiral gears to rotate in opposite directions, so that the blades of the inner and outer spiral generators stir the water flows in the inner and outer reaction areas in a coaxial counter-rotating manner, presenting counter-rotating vortices;

[0010] An automatic exhaust valve connected to the electrochemical reaction zone is provided on the top of the electrochemical reactor, and the automatic exhaust valve is connected to an external gas storage tank through a pipeline; the online monitoring probe of the water quality monitoring device extends below the liquid surface of the electrochemical reaction zone; a water inlet and outlet are provided on the side wall of the electrochemical reactor located in the vortex generating area, and the water inlet and outlet are respectively connected to the water inlet storage tank and the water outlet storage tank through pipelines.

[0011] Preferably, the electrochemical reactor is a hollow cylindrical structure consisting of an upper sealing cover, a lower sealing cover and an annular reactor shell; the outer ring anode is fitted with the reactor shell, and the inner ring anode is fitted with the central fixed axis.

[0012] Preferably, the outer ring anode, the annular mesh cathode and the inner ring anode are of the same height, and the upper and lower ends are respectively located at the same horizontal plane.

[0013] Preferably, the outer ring anode and the inner ring anode are plate anodes, and the porosity of the mesh cathode is 20% to 40%; the material of the outer ring anode and the inner ring anode is one of titanium, titanium-based oxide-plated compounds, nickel, and nickel-based oxide-plated compounds, and the material of the mesh cathode is stainless steel.

[0014] Preferably, the water quality monitoring device includes a display screen, a numerical control device and an online monitoring probe, which are used to measure the chemical oxygen demand, ammonia nitrogen content, total nitrogen content, total phosphorus content, pH value, water level and conductivity value of the water body; the numerical control device is used to feed back the water body index results measured by the online monitoring probe to the power supply device; the display screen is used to display the water body index results measured by the online monitoring probe.

[0015] Preferably, the inner spiral generator includes an inner propeller hub and inner propeller blades; the inner propeller hub is fixed on the spiral center axis, and inner propeller blades are continuously provided on the outside along the circumference, and the circumference where the outer end of the inner propeller blade is located is consistent in size with the circumference where the inner ring of the mesh cathode is located; the outer spiral generator includes outer propeller blades and an outer propeller hub; the outer propeller hub is fixed on the spiral center axis, and outer propeller blades are continuously provided on the outside along the circumference, and the circumference where the outer end of the outer propeller blade is located is consistent in size with the circumference where the outer ring anode is located, and the circumference where the inner end is located is consistent in size with the circumference where the outer ring of the mesh cathode is located.

[0016] Furthermore, the number of the inner propeller blades and the outer propeller blades is 3 to 6, and the axial inclination angle of the plane where the blade body is located relative to the central axis of the spiral is 35° to 40°, the rotation speed is 600 to 2000 rpm / min, the blade thickness is 1.5 to 3 mm, and the outer edge is curved.

[0017] Preferably, the power supply device includes a power supply and a relay; the power supply is in a constant current power supply mode with a current density of 2 to 100 , the cable is 150~300 mm 2 Single-core flexible wire; the relay is used to control the on / off time of the power supply.

[0018] Preferably, the water inlet and outlet are externally connected to a first pipeline and a second pipeline in parallel; the first pipeline is provided with a water inlet pump and a water inlet electric valve, which are connected to the water inlet storage tank; the second pipeline is provided with a water outlet pump and a water outlet electric valve, which are connected to the water outlet storage tank.

[0019] In a second aspect, the present invention provides a method for treating organic wastewater using any of the internal circulation rotating impinging flow electrocatalytic devices described in the first aspect, as follows:

[0020] High-concentration organic wastewater to be treated in the inlet reservoir is pumped through the inlet and outlet ports into the vortex generating zone. The wastewater then flows upward into the electrochemical reaction zone until it reaches a defined water level. An online monitoring probe is immersed in the water and transmits water level information to a display screen. A numerical control device regulates the switching of the inlet pump and the inlet electric valve. Simultaneously, the drive electrodes in the vortex generating zone are activated, causing the inner and outer spiral generators to rotate in opposite directions at speeds of 600 to 2000 rpm. The power supply connected to the outer ring anode, mesh cathode, and inner ring anode is also turned on.

[0021] By adjusting the inclination angle and inclination direction of the blades in the inner spiral generator and the outer spiral generator, the wastewater is caused to swirl in opposite directions in the inner reaction zone and the outer reaction zone, and the wastewater swirls upward in the inner reaction zone, pushes to the top of the electrochemical reactor, and then swirls downward along the outer reaction zone, thereby performing spiral internal circulation electrolysis in the inner and outer reaction zones; in this process, on the one hand, the formation of a reaction dead zone in the electrochemical reactor can be avoided, the concentration difference can be eliminated to a greater extent, and the treatment efficiency can be improved; on the other hand, the introduction of the cyclonic field can promote the disturbance around the electrode and the renewal process of the electrode surface components, and avoid the occurrence of bubble attachment on the electrode surface; at the same time, the outward swirl in the inner reaction zone and the inward swirl in the outer reaction zone collide at the mesh cathode in the middle, forming an impinging flow under high-speed flow, generating a strong turbulent zone, greatly promoting mass transfer, and at the same time, due to the collapse of cavitation bubbles formed by the impinging flow, generating active substances such as hydroxyl free radicals, oxygen free radicals, singlet oxygen, superoxide free radicals, hydrogen peroxide, etc., effectively removing difficult-to-degrade organic matter;

[0022] The waste gas generated in the electrochemical reaction zone during the electrolysis process is discharged from the electrochemical reactor through the automatic exhaust valve and enters the gas storage tank for pressurized collection; the water quality indicators of the sewage are monitored in real time by the water quality monitoring device. When the wastewater treatment is completed and reaches the specified indicators, the CNC device opens the water outlet pump and the water outlet electric valve and cuts off the power supply, and the waste gas is discharged to the water outlet storage tank through the water inlet and outlet and finally discharged.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The internal circulation rotating impinging stream reactor of the present invention is of tubular design, with alternating anode and cathode, having a large specific surface area and an internal cathode with a mesh structure, which significantly increases the active sites of the electrocatalytic reaction and improves the electrode stability.

[0025] 2) Under the action of the swirl generator, a swirl forms in the inner reaction zone, flowing from bottom to top and outward. Once at the top of the reactor, the external spiral generator creates a swirl from top to bottom and inward, forming an internal circulation fluid. This significantly enhances electrochemical mass transfer, promotes internal fluid turbulence, and avoids the formation of reaction dead zones. Compared to conventional reactors, the swirl design significantly increases the shear stress exerted by the fluid on the electrode plate surface, helping to prevent calcium and magnesium scaling and the formation of bubble curtains on the plate surface, improving current efficiency, and extending the service life of the electrodes.

[0026] 3) A cavitation impact flow is formed inside the reactor. The outward swirling force inside the reactor and the inward swirling force outside the reactor continuously impact and form hydraulic cavitation on the surface of the mesh cathode, thereby simultaneously realizing electrocatalysis and electrochemical processes. It is suitable for deep treatment of various wastewaters.

[0027] 4) The device is equipped with a water quality monitoring system and an automatic setting system to monitor the water quality online and automatically set the treatment time according to the treatment effect.

[0028] 5) The device is safe to operate, with an internal exhaust gas collection system. The automatic exhaust valve absorbs the chlorine and hydrogen generated during the reaction by means of negative pressure vacuum. The absorbed exhaust gas is collected and processed in the exhaust gas storage system to avoid explosions during the electrocatalytic process.

[0029] 6) The overall design facilitates easy processing, installation, maintenance, and repair, offering simple and flexible operation. The compact processing components within the reactor significantly reduce the equipment's footprint. This compact design simplifies construction and maintenance, reducing associated costs. The present invention allows for plug-and-play on-site assembly, eliminating the need for specialized reactor design. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0031] Figure 2 is a side view of the electrochemical reactor;

[0032] Figure 3 is a top view of the electrochemical reaction zone in the electrochemical reactor;

[0033] Figure 4 It is a top view of the swirl generating area in the electrochemical reactor;

[0034] In the above figures, 1-electrochemical reaction zone, 2-vortex generating zone, 3-power supply device, 4-power supply, 5-relay, 6-water quality monitoring device, 7-display screen, 8-NC device, 9-online monitoring probe, 10-reactor shell, 11-automatic exhaust valve, 12-gas storage tank, 13-upper sealing cover, 14-outer reaction zone, 15-outer ring anode, 16-mesh cathode, 17-inner reaction zone, 18-inner ring anode, 19-water inlet and outlet, 20-inner slurry hub, 21-inner propeller blade, 22-outer propeller blade, 23-outer slurry hub, 24-spiral gear, 25-spiral central shaft, 26-water inlet reservoir, 27-water inlet pump, 28-water outlet reservoir, 29-water outlet pump, 30-lower sealing cover, 31-central fixed shaft, 32-water inlet electric valve, 33-water outlet electric valve. DETAILED DESCRIPTION

[0035] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention may be combined accordingly, provided that there is no conflict between them.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0037] like Figure 1 As shown, an internal circulation rotating impact flow electrocatalytic device for treating organic wastewater provided by the present invention mainly includes an electrochemical reactor, an inlet liquid storage tank 26, an outlet liquid storage tank 28, a water quality monitoring device 6, a power supply device 3 and a gas storage tank 12.

[0038] The structure and connection method of each component will be described in detail below.

[0039] In the device of the present invention, Figure 2 As shown, the electrochemical reactor is a columnar structure with a closed inner cavity, the upper part of the inner cavity is the electrochemical reaction zone 1, the lower part of the inner cavity is the vortex generating zone 2, and the electrochemical reaction zone 1 and the vortex generating zone 2 are connected to each other. Figure 3 As shown, anode and cathode plates are arranged alternately in a concentric circular configuration within the electrochemical reaction zone 1. Specifically, an outer ring anode 15, an annular mesh cathode 16, an inner ring anode 18, and a central fixed shaft 31 are coaxially arranged within the electrochemical reaction zone 1 from the outside to the inside. There is a certain distance between the outer ring anode 15 and the mesh cathode 16, and a certain distance between the mesh cathode 16 and the inner ring anode 18. The annular region between the outer ring anode 15 and the mesh cathode 16 constitutes the outer reaction zone 14, while the annular region between the mesh cathode 16 and the inner ring anode 18 constitutes the inner reaction zone 17. The outer reaction zone 14 and the inner reaction zone 17 are connected both above and below. The outer ring anode 15, the annular mesh cathode 16, and the inner ring anode 18 are all individually controlled and connected to a power supply device 3 located outside the electrochemical reactor. The power supply device simultaneously supplies power to various electrical devices.

[0040] As a preferred embodiment of the present invention, the exterior of the electrochemical reactor is a hollow cylindrical structure consisting of an upper sealing cover 13, a lower sealing cover 30, and an annular reactor housing 10. Specifically, the top of the reactor housing 10 is sealed to the upper sealing cover 13, and the bottom of the reactor housing 10 is sealed to the lower sealing cover 30. The outer ring anode 15 is in close contact with the annular inner wall of the reactor housing 10, and the inner ring anode 18 is in close contact with the outer wall of the central fixed shaft 31.

[0041] As a preferred embodiment of the present invention, the outer ring anode 15, the annular mesh cathode 16 and the inner ring anode 18 are of the same height and are all cylindrical in structure, with the upper and lower ends being at the same horizontal plane.

[0042] In a preferred embodiment of the present invention, the outer anode 15 and the inner anode 18 are single-layer plate anodes; the mesh cathode 16 is a double-layer mesh electrode with a porosity of 20% to 40%. The outer anode 15 and the inner anode 18 are made of one of titanium, titanium-based oxide-plated compounds, nickel, or nickel-based oxide-plated compounds. Both anode plates can be made of the same material, or different materials can be selected based on actual conditions. In a reaction chamber using titanium-based lead dioxide-plated or titanium-based ruthenium-iridium-plated anodes, the anode electrocatalytically produces highly oxidizing hydroxyl radicals, while the cathode produces oxidizing hydrogen peroxide, which oxidizes organic matter and nitrogen adsorbed on the surface of the particle filler and in the wastewater, degrading pollutants and regenerating the particle filler. When the wastewater contains chloride ions, active chlorine can also form in the reactor to oxidize the pollutants, improving the efficiency of pollutant removal.

[0043] In a preferred embodiment of the present invention, the mesh cathode 16 is made of stainless steel. The outer ring anode 15 and the inner ring anode 18 are each independently controlled and connected to the positive electrode of the power supply device 3 located outside the electrochemical reactor. The mesh cathode 16 is also independently controlled and connected to the negative electrode of the power supply device 3 located outside the electrochemical reactor.

[0044] As a preferred embodiment of the present invention, all device housings are insulated and non-conductive to ensure safe use. The non-conductive material can be polytetrafluoroethylene, plexiglass, polycarbonate, etc., thereby avoiding the risk of conductive leakage from the device housing and extending its service life. To prevent rusting of the device, the housing where the vortex generating area is located and the spiral generator are made of stainless steel. The thickness of the stainless steel and plexiglass should be reasonably selected based on the actual operating water volume. In actual use, the electrochemical reaction area and the vortex generating area can be detachably connected as two devices.

[0045] In the device of the present invention, Figure 4As shown, the vortex generating area 2 is a coaxial reverse spiral structure. Two groups are set on the central fixed shaft, which are respectively connected with two groups of propeller blades arranged vertically to realize coaxial reverse spiral. Specifically as follows: the vortex generating area 2 includes an inner spiral generator and an outer spiral generator that are sleeved on the spiral central shaft 25, and the spiral central shaft 25 is coaxially connected below the central fixed shaft 31. The inner spiral generator is located below the inner reaction zone 17, and the outer spiral generator is located below the outer reaction zone 14. The inner spiral generator and the outer spiral generator are respectively connected to the spiral central shaft 25 through a spiral gear 24. The spiral central shaft 25 is driven to rotate by a driving device, which can drive the two spiral gears 24 to rotate in the opposite direction, so that the blades of the inner spiral generator and the outer spiral generator stir the water flow in the inner reaction zone 17 and the outer reaction zone 14 in the mode of coaxial reverse spiral and present reverse vortex. In actual use, the two spiral gears 24 are respectively connected with the inner slurry hub 20 of the inner spiral generator and the outer slurry hub 23 of the outer spiral generator.

[0046] As a preferred embodiment of the present invention, the inner spiral generator includes an inner propeller hub 20 and inner propeller blades 21. The inner propeller hub 20 is sleeved and fixed on the spiral central axis 25, and the inner propeller blades 21 are continuously arranged on the outer circumference. The circumference of the outer ends of the inner propeller blades 21 is consistent with the circumference of the inner ring of the mesh cathode 16, so that when the inner propeller blades 21 rotate, they mainly generate a disturbed vortex in the water of the inner reaction zone 17.

[0047] In actual use, the number of inner propeller blades 21 ranges from 3 to 6, evenly distributed around the outer circumference of the inner propeller hub 20. The plane of the inner propeller blades 21 is tilted at an angle of 35° to 40° relative to the axial direction of the propeller center axis 25. The drive device controls the rotational speed to 600 to 2000 rpm / min. The blade body of the inner propeller blades 21 is 1.5 to 3 mm thick, and the outer edge of the blade body is curved to reduce fluid resistance. The number of blades, the inclination angle of the blade body, the thickness, and the rotational speed can be adjusted according to actual conditions.

[0048] As a preferred embodiment of the present invention, the outer spiral generator includes outer propeller blades 22 and an outer propeller hub 23. The outer propeller hub 23 is fixedly mounted on the spiral central axis 25, and the outer propeller blades 22 are continuously arranged on the outer circumference. The outer ends of the outer propeller blades 22 are arranged on a circle with the same size as the outer ring anode 15, and the inner ends are arranged on a circle with the same size as the outer ring of the mesh cathode 16. When the outer propeller blades 22 rotate, they mainly generate a disturbed vortex in the water of the outer reaction zone 14.

[0049] In actual use, the number of outer propeller blades 22 ranges from 3 to 6, evenly distributed around the outer hub 23. The plane of the outer propeller blades 22 is tilted at an angle of 35° to 40° relative to the axial direction of the propeller center axis 25. The drive device controls the rotational speed to 600 to 2000 rpm / min. The blade body of the outer propeller blades 22 is 1.5 to 3 mm thick, and the outer edge of the blade body is curved to reduce fluid resistance. The number of blades, the inclination angle of the blade body, the thickness, and the rotational speed can be adjusted according to actual conditions.

[0050] Specifically, by adjusting the axial inclination angle and inclination direction of the inner and outer propeller blades 21 and 22 relative to the spiral center axis 25, the inner propeller blades 21 can be rotated under the action of the driving device to form a vortex that spirals upward and outward, and at the same time, the outer propeller blades 22 can form a vortex that spirals downward and inward, thereby forming an internal circulation impact flow inside the electrochemical reactor.

[0051] In the device of the present invention, Figure 1 As shown, an automatic exhaust valve 11 is provided on the top of the electrochemical reactor and is connected to the electrochemical reaction zone 1. The automatic exhaust valve 11 is connected to an external gas storage tank 12 through a pipeline, and then pressurized separation is performed to treat the waste gas as a resource.

[0052] In actual application, after the electrochemical reaction zone 1 is energized, hydrogen, chlorine and oxygen are generated inside the reactor due to the electrochemical reaction. An automatic exhaust valve 11 is provided on the upper part of the reactor to absorb the waste gas generated during the reaction process by means of negative pressure vacuum suction. The absorbed gas is collected and processed in a gas storage tank 12 to avoid air pollution and explosion. When in use, the automatic exhaust valve 11 is rotated to the top of the reactor and the switch is turned on. When not in use, it is rotated to the side of the reactor and the switch is turned off.

[0053] In the device of the present invention, Figure 1 As shown, the online monitoring probe 9 of the water quality monitoring device 6 extends below the liquid level in the electrochemical reaction zone 1. A water inlet and outlet 19 is provided on the side wall of the electrochemical reactor located in the vortex generating zone 2. The inlet and outlet water share a common inlet and outlet port, and the inlet and outlet 19 are connected to the inlet and outlet reservoirs 26 and 28 respectively through pipelines.

[0054] As a preferred embodiment of the present invention, the water quality monitoring device 6 mainly includes a display screen 7, a numerical control device 8 and an online monitoring probe 9, which are used to measure the chemical oxygen demand (COD) and ammonia nitrogen (NH4 + The numerical control device 8 is used to feed back the water quality index results measured by the online monitoring probe 9 to the power supply device 3. The display screen 7 is used to display the water quality index results measured by the online monitoring probe 9.

[0055] As a preferred embodiment of the present invention, the power supply device 3 includes a power supply 4 and a relay 5. The power supply 4 is in a constant current power supply mode with a current density of 2 to 100 Depending on the applied current, the cable is 150~300 mm 2 Single core soft wire can prevent the cable from overloading and heating due to high current. Relay 5 is used to control the on and off time of the power supply, thereby controlling the time and process of the reaction.

[0056] In a preferred embodiment of the present invention, the water inlet and outlet 19 is externally connected to a first pipeline and a second pipeline in parallel. The first pipeline is equipped with an inlet pump 27 and an electric inlet valve 32, which communicate with the inlet liquid reservoir 26. The second pipeline is equipped with an outlet pump 29 and an electric outlet valve 33, which communicate with the outlet liquid reservoir 28.

[0057] The present invention also provides a method for treating organic wastewater using the above-mentioned internal circulation rotating impact flow electrocatalytic device, which is specifically as follows:

[0058] High-concentration organic wastewater to be treated in the inlet reservoir 26 enters the vortex generating zone 2 through the inlet and outlet 19 via the inlet pump 27. The wastewater then flows upward into the electrochemical reaction zone 1 until it reaches the defined water level. An online monitoring probe 9 is submerged in the water and transmits water level information to the display screen 7. The numerical control device 8 regulates the opening and closing of the inlet pump 27 and the electric inlet valve 32. Simultaneously, the drive electrodes in the vortex generating zone 2 are activated, causing the inner and outer spiral generators to rotate in opposite directions at speeds of 600 to 2000 rpm. The power supply 4 of the power supply device 3, connected to the outer ring anode 15, mesh cathode 16, and inner ring anode 18, is also turned on.

[0059] By adjusting the inclination angle and direction of the blades in the inner and outer spiral generators, the wastewater swirls in opposite directions in the inner reaction zone 17 and the outer reaction zone 14. The wastewater swirls upward in the inner reaction zone 17, flows to the top of the electrochemical reactor, and then swirls downward along the outer reaction zone 14, thereby performing spiral internal circulation electrolysis in the inner and outer reaction zones 17 and 14. This process, on the one hand, avoids the formation of reaction dead zones in the electrochemical reactor, greatly eliminates concentration differences, and improves treatment efficiency. On the other hand, the introduction of the swirling field promotes disturbance around the electrodes and the renewal of electrode surface components, preventing the occurrence of bubbles adhering to the electrode surfaces. At the same time, the outward swirling flow of the inner reaction zone 17 and the inward swirling flow of the outer reaction zone 14 collide at the middle mesh cathode 16, forming an impact flow under high-speed flow, generating a strong turbulent zone, which greatly promotes mass transfer. At the same time, due to the collapse of cavitation bubbles formed by the impact flow, active substances such as hydroxyl free radicals, oxygen free radicals, singlet oxygen, superoxide free radicals, hydrogen peroxide, etc. are generated, which effectively remove difficult-to-degrade organic matter.

[0060] Waste gas generated during the electrolysis process in electrochemical reaction zone 1 is discharged from the electrochemical reactor through automatic exhaust valve 11 and enters gas storage tank 12 for pressurized collection. Water quality monitoring device 6 monitors the wastewater's water quality in real time. When wastewater treatment is complete and meets specified standards, numerical control device 8 activates outlet pump 29 and outlet electric valve 33, cuts off power supply 4, and discharges the wastewater through inlet and outlet 19 into outlet liquid storage tank 28 for final discharge.

[0061] During the electrolytic treatment of wastewater, bubbles are generated on the surfaces of the anode and cathode plates due to the hydrogen and oxygen evolution reactions and adhere to the plates. This reduces the number of active sites on the plates, which in turn increases the ohmic drop, increasing electrolysis energy consumption and reducing degradation efficiency. High-speed swirling flow allows bubbles attached to the plate surfaces to be quickly detached through shear force. This helps maintain maximum plate activity, increases the electrochemical reaction area, and enhances component and mass transfer within the reactor, ultimately strengthening the electrochemical oxidation process and improving degradation.

[0062] The present invention targets high-concentration industrial wastewater, combines impinging stream technology with electrocatalytic technology, and utilizes a vortex generating area to realize an internal circulation impinging stream. It has the advantages of high treatment efficiency, small footprint, and low operating energy consumption. It can solve the problem of bubble adhesion on the electrode surface, and form strong turbulence through impact, reduce the reaction dead zone, and enhance mass transfer in the electrochemical degradation device, thereby achieving the purpose of automated operation and efficient degradation. It is of great significance in the treatment of high-concentration organic wastewater.

[0063] The above embodiment is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent substitution or equivalent transformation falls within the scope of protection of the present invention.

Claims

1. An internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater, characterized in that: It includes an electrochemical reactor, a water inlet storage tank (26), a water outlet storage tank (28), a water quality monitoring device (6), a power supply device (3) and a gas storage tank (12); The electrochemical reactor is a columnar structure with a closed inner cavity, wherein the upper portion of the inner cavity is an electrochemical reaction zone (1) and the lower portion is a vortex generating zone (2); the electrochemical reaction zone (1) comprises an outer ring anode (15), an annular mesh cathode (16), an inner ring anode (18) and a central fixed shaft (31) which are coaxially sleeved from the outside to the inside; the annular region between the outer ring anode (15) and the mesh cathode (16) constitutes an outer reaction zone (14); the annular region between the mesh cathode (16) and the inner ring anode (18) constitutes an inner reaction zone (17); the outer reaction zone (14) and the inner reaction zone (17) are connected above and below; the outer ring anode (15), the annular mesh cathode (16) and the inner ring anode (18) are all connected to the power supply device (3) in a separately controlled manner; The vortex generating area (2) includes an inner spiral generator and an outer spiral generator sleeved on a spiral central shaft (25), and the spiral central shaft (25) is coaxially connected to the bottom of the central fixed shaft (31); the inner spiral generator is located below the inner reaction area (17), and the outer spiral generator is located below the outer reaction area (14), and the inner spiral generator and the outer spiral generator are respectively connected to the spiral central shaft (25) through spiral gears (24); the spiral central shaft (25) is driven to rotate by a driving device, which can drive the two spiral gears (24) to rotate in opposite directions, so that the blades of the inner spiral generator and the outer spiral generator stir the water flows in the inner reaction area (17) and the outer reaction area (14) in a coaxial reverse spiral manner, thereby presenting reverse vortexes; An automatic exhaust valve (11) communicating with the electrochemical reaction zone (1) is provided on the top of the electrochemical reactor, and the automatic exhaust valve (11) is connected to an external gas storage tank (12) through a pipeline; an online monitoring probe (9) of the water quality monitoring device (6) extends below the liquid surface of the electrochemical reaction zone (1); a water inlet and outlet (19) are provided on the side wall of the electrochemical reactor located in the vortex generating zone (2), and the water inlet and outlet (19) are respectively communicated with a water inlet storage tank (26) and a water outlet storage tank (28) through pipelines; The inner spiral generator comprises an inner propeller hub (20) and inner propeller blades (21); the inner propeller hub (20) is sleeved and fixed on the spiral central axis (25), and the inner propeller blades (21) are continuously provided on the outside along the circumference, and the circumference of the outer end of the inner propeller blade (21) is consistent in size with the circumference of the inner ring of the mesh cathode (16); the outer spiral generator comprises an outer propeller blade (22) and an outer propeller hub (23); the outer propeller hub (23) is sleeved and fixed on the spiral central axis (25), and the outer propeller blades (22) are continuously provided on the outside along the circumference, and the circumference of the outer end of the outer propeller blade (22) is consistent in size with the circumference of the outer ring anode (15), and the circumference of the inner end is consistent in size with the circumference of the outer ring of the mesh cathode (16).

2. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The electrochemical reactor is a hollow cylindrical structure consisting of an upper sealing cover (13), a lower sealing cover (30) and an annular reactor shell (10); the outer ring anode (15) is arranged in affixed relation to the reactor shell (10), and the inner ring anode (18) is arranged in affixed relation to the central fixed shaft (31).

3. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The outer ring anode (15), the annular mesh cathode (16) and the inner ring anode (18) are at the same height, and the upper and lower ends are respectively located at the same horizontal plane.

4. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The outer ring anode (15) and the inner ring anode (18) are plate anodes, and the porosity of the mesh cathode (16) is 20% to 40%. The outer ring anode (15) and the inner ring anode (18) are made of one of titanium, titanium-based oxide-plated compounds, nickel, and nickel-based oxide-plated compounds, and the mesh cathode (16) is made of stainless steel.

5. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The water quality monitoring device (6) comprises a display screen (7), a numerical control device (8) and an online monitoring probe (9), and is used to measure the chemical oxygen demand, ammonia nitrogen content, total nitrogen content, total phosphorus content, pH value, water level and conductivity value of the water body; the numerical control device (8) is used to feed back the water body index results measured by the online monitoring probe (9) to the power supply device (3); and the display screen (7) is used to display the water body index results measured by the online monitoring probe (9).

6. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The number of the inner propeller blades (21) and the outer propeller blades (22) is 3 to 6, the axial inclination angle of the plane where the blade body is located relative to the spiral center axis (25) is 35° to 40°, the rotation speed is 600 to 2000 rpm / min, the blade thickness is 1.5 to 3 mm, and the outer edge is curved.

7. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The power supply device (3) includes a power supply (4) and a relay (5); the power supply (4) is in a constant current power supply mode, and the current density is 2 to 100 , the cable is 150~300 mm 2 Single-core soft wire; the relay (5) is used to control the on / off time of the power supply.

8. The internal circulation rotating impinging flow electrocatalytic device for treating organic wastewater according to claim 1, characterized in that: The water inlet and outlet (19) are externally connected to a first pipeline and a second pipeline in parallel; the first pipeline is provided with a water inlet pump (27) and a water inlet electric valve (32), which is in communication with the water inlet liquid storage tank (26); the second pipeline is provided with a water outlet pump (29) and a water outlet electric valve (33), which is in communication with the water outlet liquid storage tank (28).

9. A method for treating organic wastewater using the internal circulation rotating impinging current electrocatalytic device according to any one of claims 1 to 8, characterized in that: The details are as follows: The high-concentration organic wastewater to be treated in the water inlet storage tank (26) enters the vortex generating area (2) from the water inlet and outlet (19) through the water inlet pump (27), and the wastewater enters the electrochemical reaction area (1) from bottom to top until it reaches the defined water level line; the online monitoring probe (9) is immersed in water and transmits the water level information to the display screen (7), and the water inlet pump (27) and the water inlet electric valve (32) are regulated by the numerical control device (8), and the driving electrode in the vortex generating area (2) is turned on at the same time to make the inner spiral generator and the outer spiral generator rotate in opposite directions at a speed of 600-2000 rpm / min respectively, and the power supply (4) of the power supply device (3) connected to the outer ring anode (15), the mesh cathode (16) and the inner ring anode (18) is turned on; By adjusting the inclination angle and inclination direction of the blades in the inner spiral generator and the outer spiral generator, the wastewater is caused to swirl in opposite directions in the inner reaction zone (17) and the outer reaction zone (14), and the wastewater swirls upward in the inner reaction zone (17), is pushed to the top of the electrochemical reactor, and then swirls downward along the outer reaction zone (14), thereby performing spiral internal circulation electrolysis in the inner reaction zone (17) and the outer reaction zone (14); in this process, on the one hand, the formation of a reaction dead zone in the electrochemical reactor can be avoided, the concentration difference can be eliminated to a greater extent, and the treatment efficiency can be improved; on the other hand, In terms of the above, the introduction of the vortex field can promote the disturbance around the electrode and the renewal process of the electrode surface components, thereby avoiding the occurrence of bubble attachment on the electrode surface; at the same time, the outward vortex of the inner reaction zone (17) and the inward vortex of the outer reaction zone (14) collide at the middle mesh cathode (16), forming an impact flow under high-speed flow, generating a strong turbulent zone, greatly promoting mass transfer, and at the same time, due to the collapse of the cavitation bubbles formed by the impact flow, hydroxyl free radicals, oxygen free radicals, singlet oxygen, superoxide free radicals, and hydrogen peroxide active substances are generated, effectively removing difficult-to-degrade organic matter; The waste gas generated in the electrochemical reaction zone (1) during the electrolysis process is discharged from the electrochemical reactor through the automatic exhaust valve (11) and enters the gas storage tank (12) for pressurized collection; the water quality index of the sewage is monitored in real time by the water quality monitoring device (6); when the wastewater treatment is completed and reaches the specified index, the numerical control device (8) opens the water outlet pump (29) and the water outlet electric valve (33) and cuts off the power supply (4), and the wastewater is discharged to the water outlet storage tank (28) through the water inlet and outlet (19) and finally discharged.

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