Multi-stage plate-type electro-catalysis membrane reactor for degrading organic matters in reverse osmosis concentrated water of coking wastewater and application of multi-stage plate-type electro-catalysis membrane reactor

Abstract

The invention discloses a multi-stage plate-type electro-catalytic membrane reactor for degrading organic matters in reverse osmosis concentrated water of coking wastewater and application of the multi-stage plate-type electro-catalytic membrane reactor. The multi-stage plate-type electro-catalytic membrane reactor is internally provided with a chamber for electrochemical reaction, and consists of a plurality of cathode chambers and anode chambers which are the same in number and are uniformly alternated, a conductive contact pin, a water inlet end and a water outlet end, the distance between every two cavities is 10 mm, the multiple cathode chambers and the multiple anode chambers which are the same in number and are evenly and alternately arranged are detachable plate faces, operation is convenient, and environment friendliness is achieved. The multi-stage plate-type electro-catalytic membrane reactor is simple in design, wastewater runs in the reactor in a circulation mode, mass transfer can be improved, the electrochemical active surface area can be increased, the current utilization efficiency can be improved through a parallel power connection mode, and the service life of the reactor is prolonged. The device has the advantages of high organic matter removal efficiency, convenience in actual operation, automatic management, good stability, low operation energy consumption, reusability and the like, and has research significance in the field of electrochemical water treatment.

Description

A multi-stage plate electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater and its application. Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and in particular to a multi-stage plate electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater and its application. Background Technology

[0002] In recent years, while industry has developed rapidly, it has also generated a huge amount of industrial wastewater. The coking industry is a major contributor to industrial wastewater discharge. Reverse osmosis membrane technology is widely used in the treatment of coking wastewater. However, the coking wastewater reverse osmosis concentrate produced has the characteristics of high salt content, high organic pollutant content, and high toxicity, making it a difficult industrial wastewater to treat.

[0003] Electrochemical advanced oxidation (ECO) technology is widely used for the degradation of organic pollutants due to its ease of operation, lack of secondary pollution, and good degradation performance. During ECO, hydroxyl radicals generated by electron transfer at the anode play a crucial role in the degradation of organic pollutants. Therefore, selecting suitable anode materials is essential for removing organic pollutants. It is worth noting that the degradation performance of ECO technology is related not only to the properties of the anode material but also to the reactor structure. Because most existing electrocatalytic reactors (ECRs) have small treatment scales, low organic matter degradation efficiency, and very high energy consumption, developing more efficient electrocatalytic oxidation reactors is a necessary condition for industrial wastewater treatment.

[0004] A multi-stage plate electrocatalytic membrane reactor (with several identical, uniformly alternating cathode and anode chambers) can utilize multiple anodes to degrade organic matter, increasing the electrochemical active area. Furthermore, the 10mm spacing between each chamber in this reactor allows the liquid to pass vertically through the anode and cathode from bottom to top, increasing mass transfer flux and improving the oxidative degradation efficiency of organic matter. Compared to a single-stage multi-stage plate electrocatalytic membrane reactor, the multi-stage reactor utilizes multiple sets of porous electrodes for organic matter degradation, significantly increasing the oxidative degradation efficiency within the same timeframe and shortening the operating time. In addition, the parallel connection of the multi-stage reactor improves current utilization efficiency and reduces energy consumption. Summary of the Invention

[0005] This invention provides a multi-stage plate electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater and its application, in order to solve the problems existing in related technologies. The technical solution is as follows:

[0006] In a first aspect, the present invention provides a multi-stage plate-type electrocatalytic membrane reactor device, comprising:

[0007] A multi-stage plate electrocatalytic membrane reactor has several identical, uniformly alternating chambers for electrochemical reactions: cathode chamber and anode chamber, conductive pins, inlet end and outlet end;

[0008] The multi-stage plate electrocatalytic membrane reactor contains several uniformly alternating cathode and anode chambers with a spacing of 10 mm, all of which are detachable plate frames. Two or more stages of porous plate electrocatalytic membrane anodes and porous plate conductive cathodes are placed in the uniformly alternating anode and cathode chambers as porous electrode pairs. The conductive pins serve as the contact points for each porous plate electrocatalytic membrane anode and porous plate conductive cathode.

[0009] The feeding unit is a water storage beaker, which is located on one side of the multi-stage plate electrocatalytic membrane reactor and is connected to the chamber through a water pipe to supply the reaction raw material liquid to the chamber;

[0010] A magnetic stirrer with a rotor is placed at the bottom of the water storage beaker, which can achieve uniform flow of the reaction raw material liquid.

[0011] The reaction raw materials undergo an electrochemical reaction in a multi-stage plate electrocatalytic membrane reactor and then flow back to the water storage beaker from the outlet. During the reaction process, the reaction raw material liquid circulates through the beaker.

[0012] A DC regulated power supply, with its positive and negative terminals connected to the porous plate electrocatalytic membrane anode and porous plate conductive cathode of the first-stage porous electrode pair, respectively, and the porous plate electrocatalytic membrane anode and porous plate conductive cathode of the remaining porous electrode pairs connected sequentially via double-connector wires.

[0013] Preferably, the two or more porous electrode pairs are arranged in a manner in which porous plate electrocatalytic membrane anodes and porous plate conductive cathodes are alternately arranged, and the electrode spacing between each chamber is 10 mm.

[0014] Preferably, the anode of the porous plate electrocatalytic membrane is a Ti / BNTA / SnO2-Sb2O3 porous electrocatalytic membrane.

[0015] The porous plate electrocatalytic membrane anode Ti / BNTA / SnO2-Sb2O3 refers to the supporting membrane Ti, the intermediate layer BNTA modified in situ on the supporting membrane Ti, and the catalyst SnO2-Sb2O3 supported on the supporting membrane.

[0016] Preferably, the porous plate conductor cathode is a porous stainless steel plate.

[0017] Preferably, each level of the porous electrode pair or multiple levels of the porous electrode pair has conductive pins on both sides of the chamber for conducting electricity.

[0018] Preferably, the reaction feed liquid is connected to the lower inlet of the multi-stage plate electrocatalytic membrane reactor, and the reaction feed liquid flows back to the water storage beaker from the upper outlet of the multi-stage plate electrocatalytic membrane reactor, so that the entire system circulates from bottom to top.

[0019] Preferably, a peristaltic pump is provided on the communication path between the feeding unit and the multi-stage plate electrocatalytic membrane reactor for pumping reaction raw materials into the chamber of the multi-stage plate electrocatalytic membrane reactor.

[0020] Secondly, the present invention provides an application of the multi-stage plate electrocatalytic membrane reactor described in any of the above claims in the oxidative degradation of organic matter in the reverse osmosis concentrate of coking wastewater, as detailed below:

[0021] A method for degrading organic matter in reverse osmosis concentrate of coking wastewater using a multi-stage plate electrocatalytic membrane reactor comprises pretreated reverse osmosis concentrate of coking wastewater, a multi-stage plate electrocatalytic membrane reactor containing several uniformly alternating anode and cathode chambers, a water storage beaker, a rotor, a peristaltic pump, a water delivery pipe, a magnetic stirrer, an adjustable DC regulated power supply, double-connector wires, rigid pipes, and flexible pipes.

[0022] The method involves connecting the conductive pin at the anode of one of the porous plate electrocatalytic membranes to the positive terminal of the adjustable DC regulated power supply, and sequentially connecting the double-connector wire to the conductive pins at the anodes of the remaining porous plate electrocatalytic membranes; connecting the conductive pin at the cathode of one of the porous plate conductors to the negative terminal of the adjustable DC regulated power supply, and sequentially connecting the double-connector wire to the conductive pins at the cathodes of the remaining porous plate conductors; the lower end of the multi-stage plate electrocatalytic membrane reactor is designated as the inlet, and the upper end of the multi-stage plate electrocatalytic membrane reactor is designated as the outlet.

[0023] The water inlet of the multi-stage plate electrocatalytic membrane reactor is connected to the peristaltic pump tube by inserting the water guide pipe, and the water outlet of the multi-stage plate electrocatalytic membrane reactor is further secured above the water storage beaker by inserting the water guide pipe.

[0024] The double-connector wires are sequentially connected to the conductive contacts at the anode and cathode chambers of the remaining multi-stage plate electrocatalytic membrane reactor. The connection is in parallel, and the actual current of each anode or cathode is the total anode current and total cathode current of the DC regulated power supply divided by the number of operating anodes or cathodes.

[0025] The reaction raw material liquid in the water storage beaker is drawn out by the peristaltic pump and flows into the pump pipe. It is then introduced into the multi-stage plate electrocatalytic membrane reactor from the inlet end by the peristaltic pump. The wastewater flows from bottom to top in a flow-through mode through the porous electrode pair of cathode and anode. It is then pressurized by the peristaltic pump and flows back to the water storage beaker from the outlet end. In this process, the organic matter is efficiently removed.

[0026] The water storage beaker contains a rotor, which, when used in conjunction with the lower magnetic stirrer, enables the reaction raw material liquid to form a homogeneous solution during the circulation process.

[0027] Along the water flow direction, the reaction raw material liquid flows sequentially through multiple sets of porous electrode pairs in the multi-stage plate electrocatalytic membrane reactor. The plates of the porous plate electrocatalytic membrane anode and the porous plate conductive cathode are both set perpendicular to the water flow direction. The distance between any chamber in the multi-stage plate electrocatalytic membrane reactor is 10 mm.

[0028] Turn on the power supply to provide a stable current to each of the multiple sets of porous electrode pairs;

[0029] Turn on the pump to continuously pump the coking wastewater reverse osmosis concentrate from the water storage beaker into the chamber of the multi-stage plate electrocatalytic membrane reactor.

[0030] The external adjustable DC regulated power supply has a voltage adjustment range of 0–20V and a current adjustment range of 0–5A.

[0031] The peristaltic pump has a rotational speed range of 0-150 rpm.

[0032] Preferably, the current density is set to 20 mA / cm². 2 .

[0033] Preferably, the peristaltic pump speed is set to 150 rpm.

[0034] Compared with existing technologies, the multi-stage plate electrocatalytic membrane reactor of the present invention has the following advantages:

[0035] To increase the electrochemical active surface area and improve mass transfer, the multi-stage plate electrocatalytic membrane reactor utilizes multiple sets of porous electrode pairs for the oxidative degradation of organic matter. Wastewater flows through the multi-stage electrocatalytic membrane reactor in a flow-through mode, allowing the water to sequentially pass through multiple sets of electrode pairs within the reactor, achieving highly efficient degradation of organic matter. Because the multiple sets of electrode pairs in the multi-stage plate electrocatalytic membrane reactor oxidize and degrade organic pollutants in the wastewater, it also extends electrode life. The small electrode spacing between each chamber and the parallel connection of each porous electrode pair improves current utilization efficiency and reduces energy consumption in practical electrochemical applications. The multi-stage plate electrocatalytic membrane reactor consists of an inlet and an outlet. Its design is simple, it can be automated, facilitates scaling up industrial wastewater treatment, is environmentally friendly, and can be reused. Attached Figure Description

[0036] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0037] Figure 1 is a schematic diagram of a multi-stage plate electrocatalytic membrane reactor used to degrade organic matter in reverse osmosis concentrate of coking wastewater.

[0038] Figure 2 shows the effect of different porous electrodes on the degradation of organic matter in the reverse osmosis concentrate of coking wastewater in the multi-stage plate electrocatalytic membrane reactor of Example 1.

[0039] Figure 3 shows the energy consumption values ​​for degrading organic matter in the reverse osmosis concentrate of coking wastewater in the multi-stage plate electrocatalytic membrane reactor with different numbers of porous electrode pairs in Example 1.

[0040] Figure reference numerals: 1. Multistage plate electrocatalytic membrane reactor; 2. Cathode chamber; 3. Anode chamber; 4. Conductive contact pin; 5. Water inlet; 6. Water outlet; 7. Porous electrode pair; 8. Water storage beaker; 9. Reaction feed liquid; 10. Adjustable DC regulated power supply; 11. Porous plate electrocatalytic membrane anode; 12. Porous plate conductive cathode; 13. Double-connector wire; 14. Peristaltic pump; 15. Water guide pipe; 16. Pump pipe; 17. Positive electrode wire; 18. Negative electrode wire; 19. Rotor; 20. Magnetic stirrer. Detailed Implementation

[0041] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, the elements, mechanisms, and features in one embodiment may be advantageously incorporated into other embodiments.

[0042] In the description of the invention in this application, it should be noted that the terms "inner," "outer," "upper," "lower," "front," and "rear," etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the "level" of the porous electrode pairs described in this application refers to the number of pairs of multiple sets of electrode pairs.

[0043] Example 1

[0044] A multi-stage plate electrocatalytic membrane reactor device, as shown in Figure 1, includes:

[0045] A multi-stage plate electrocatalytic membrane reactor 1 has several identical, uniformly alternating chambers for electrochemical reactions: cathode chamber 2 and anode chamber 3, conductive contact pin 4, water inlet 5 and water outlet 6.

[0046] Two or more porous electrode pairs 7 are disposed within the chamber of the multi-stage plate electrocatalytic membrane reactor 1; the porous electrode pairs 7 include porous plate electrocatalytic membrane anodes 11 and porous plate conductive cathodes 12 uniformly and alternately arranged; the porous plate electrocatalytic membrane anode includes a supporting membrane Ti, an intermediate layer BNTA modified in situ on the supporting membrane Ti, and a catalyst SnO2-Sb2O3 supported on the supporting membrane; the porous plate conductive cathode is a porous stainless steel plate;

[0047] The multi-stage plate electrocatalytic membrane reactor provided in the above embodiments, by setting two or more stages of porous electrode pairs and modifying the supporting membrane, has good stability and can be reused repeatedly. The organic pollutants in the reverse osmosis concentrate of the coking wastewater to be treated will pass through the porous electrode pairs step by step for electrochemical oxidation reaction, achieving high efficiency of electrochemical oxidation reaction; it uses electrons as "reagent" to directly oxidize and degrade organic matter or indirectly oxidize and degrade organic matter through strong oxidizing free radicals such as hydroxyl radicals, chlorine radicals and sulfate radicals generated in situ during the reaction, without the need to add additional strong oxidizing reagents, avoiding secondary pollution, and is green and environmentally friendly; it has the advantages of high efficiency, high selectivity and simple operation, and is suitable for the treatment and application of industrial production wastewater.

[0048] In a preferred embodiment, two or more porous electrode pairs 7 are arranged in an alternating manner with porous plate conductive cathodes 12 and porous plate electrocatalytic membrane anodes 11, with a spacing of 10 mm between adjacent electrodes, as shown in Figure 1. Multiple sets of uniformly alternating porous electrode pairs in the chamber of the multi-stage plate electrocatalytic membrane reactor 1 can achieve a step-by-step oxidation reaction. Furthermore, controlling the electrode spacing to a short value can reduce the actual operating voltage and improve mass transfer, thus ensuring the continuity of the step-by-step electrochemical oxidation reaction. It is understood that the spacing between adjacent electrodes can also be 20 mm, 30 mm, 40 mm, 50 mm, etc., and those skilled in the art can select from the above ranges.

[0049] In a preferred embodiment, the supporting membrane is a porous titanium (Ti) membrane with good conductivity, an in-situ modified intermediate layer of BNTA is supported on the supporting Ti membrane, and a catalyst SnO2-Sb2O3 is supported on the supporting membrane. The prepared Ti / BNTA / SnO2-Sb2O3 is used as the anode of the porous plate electrocatalytic membrane for the electrocatalytic anodic oxidation of organic matter. Furthermore, in order to increase the electrochemical active surface area and improve mass transfer, the multi-stage plate electrocatalytic membrane reactor utilizes multiple sets of porous electrode pairs for the oxidative degradation of organic matter, as shown in Figure 2. (Comparison of multi-stage plate electrocatalytic membrane...) In the single-stage mode of the reactor, the COD concentration is significantly reduced within the same time frame due to the oxidation and degradation of organic pollutants in the wastewater by multiple sets of porous electrode pairs in the multi-stage plate electrocatalytic membrane reactor. This indicates that the multi-stage structure of the multi-stage plate electrocatalytic membrane reactor improves the oxidation and degradation effect of organic matter. In addition, the small spacing (10 mm) between each chamber and the parallel connection between each set of porous electrode pairs in the multi-stage plate electrocatalytic membrane reactor can improve the current utilization efficiency and reduce the actual operating voltage, as shown in Figure 3. As the number of stages of the porous plate electrocatalytic membrane reactor increases, the energy consumption of electrochemical applications decreases.

[0050] Example 2

[0051] Electrocatalytic oxidation refers to the direct oxidative degradation of organic pollutants through direct electron transfer, or the indirect oxidative degradation of organic pollutants through the generation of highly oxidizing free radicals (such as hydroxyl radicals, chlorine radicals, and sulfate radicals) at the anode surface via electron transfer. Electrocatalytic oxidation can achieve highly efficient removal of recalcitrant organic pollutants through both direct and indirect oxidation. It is worth noting that electrocatalytic oxidation is related not only to the anode material but also to the reactor structure. A good reactor structure can improve mass transfer of organic matter, increase the electrochemical active surface area, and reduce energy consumption, thus providing better prospects for electrochemical applications.

[0052] Another aspect of this application provides an application and method for degrading organic matter in reverse osmosis concentrate of coking wastewater using a multi-stage plate electrocatalytic membrane reactor according to the above embodiments, as shown in Figure 1. The reactor includes: a porous plate electrocatalytic membrane anode (Ti / BNTA / SnO2-Sb2O311) with high oxidation performance and a porous plate conductive cathode (stainless steel 12); a high-efficiency multi-stage plate electrocatalytic membrane reactor 1; a pretreated coking wastewater reverse osmosis concentrate reaction feed solution 9; a water storage beaker 8; a peristaltic pump 14; a water pipe 15; a pump pipe 16; an adjustable DC regulated power supply 10; a positive electrode wire 17; a negative electrode wire 18; a double-connector wire 13; a rotor 19; and a magnetic stirrer 20.

[0053] In a preferred embodiment, the positive electrode wire 17 and the negative electrode wire 18 of the DC regulated power supply 10 are respectively connected to the porous plate electrocatalytic membrane anode 11 and the porous plate conductive cathode 12 of the first-stage porous electrode pair 7. The porous plate electrocatalytic membrane anode 11 and the porous plate conductive cathode 12 of the remaining porous membrane electrode pairs 7 are connected in sequence through a double-connector wire 13, so as to realize the current connection in the multiple sets of porous electrode pairs 7 in the reactor and ensure the subsequent electrochemical reaction.

[0054] In a preferred embodiment, the feeding unit is a water storage beaker 8, which is located on one side of the multi-stage plate electrocatalytic membrane reactor 1. The coking wastewater reverse osmosis concentrate reaction feedstock 9 is connected to the inlet 5 of the high-efficiency multi-stage plate electrocatalytic membrane reactor 1 via a peristaltic pump 14, a pump pipe 16, and a water guide pipe 15, for supplying the coking wastewater reverse osmosis concentrate reaction feedstock 9 to the chamber of the multi-stage plate electrocatalytic membrane reactor 1. The coking wastewater reverse osmosis concentrate reaction feedstock 9 flows sequentially through multiple sets of porous electrode pairs 7 in the multi-stage plate electrocatalytic membrane reactor 1 for electrochemical reaction in stages, and then flows back to the water storage beaker 8 from the outlet 6. During the reaction, the coking wastewater reverse osmosis concentrate reaction feedstock 9 circulates, achieving efficient removal of organic matter.

[0055] The method for degrading organic matter in reverse osmosis concentrate of coking wastewater using a multi-stage plate electrocatalytic membrane reactor is as follows:

[0056] Porous electrode pairs 7 are arranged in a uniform alternation pattern of "cathode-anode-cathode-anode-cathode-anode" in the chamber of the multi-stage plate electrocatalytic membrane reactor 1;

[0057] Prepare the coking wastewater reverse osmosis concentrate reaction feed liquid 9 and place it in the water storage beaker 8 of the feeding unit;

[0058] The water storage beaker 8 is equipped with a rotor 19. When the magnetic stirrer 20 is turned on, a homogeneous solution is formed inside the water storage beaker 8.

[0059] Turn on the DC regulated power supply 10 to provide a stable current to each porous electrode pair 7;

[0060] Turn on the peristaltic pump 14 to continuously pump the coking wastewater reverse osmosis concentrate reaction feed liquid 9 from the water storage beaker 8 into the multi-stage plate electrocatalytic membrane reactor 1.

[0061] The wastewater reverse osmosis concentrate reaction feed liquid 9 is circulated through the internal chamber of the multi-stage plate electrocatalytic membrane reactor 1 to achieve efficient degradation of organic pollutants in the coking wastewater reverse osmosis concentrate.

[0062] Specifically, the organic compounds oxidized in the above-described organic electrochemical oxidation reaction include phenolic pollutants, polycyclic aromatic hydrocarbon pollutants, nitrogen-containing heterocyclic compounds, ester pollutants, alkanes, and long-chain alkanes.

[0063] It is worth noting that, since the multiple porous plate electrocatalytic membrane anodes Ti / BNTA / SnO2-Sb2O311 and porous plate conductive cathodes stainless steel 12 are connected in parallel, this connection method can improve current utilization efficiency and save energy.

[0064] In a preferred embodiment, the multi-stage plate electrocatalytic membrane reactor 1 is selected with three porous electrode pairs, and the DC regulated current 10 is controlled at 20 mA / cm². 2 Adjust the speed of peristaltic pump 14 to 150 rpm.

[0065] The electrochemical oxidation method provided in the above embodiments utilizes a multi-stage plate electrocatalytic membrane reactor. By adjusting the type, number, and distribution of the porous plate electrocatalytic membrane anodes, and controlling current density, peristaltic pump speed, and temperature, highly efficient oxidation of organic matter can be achieved. Furthermore, it operates at ambient temperature and pressure without using strong oxidizing or reducing agents, exhibiting high efficiency, environmental friendliness, simple operation, and safety, making it suitable for industrial-scale implementation and widely applicable to the degradation and removal of organic matter.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A plate-type multi-stage electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater, characterized in that: A multi-stage plate electrocatalytic membrane reactor (1) contains several uniformly alternating cathode chambers (2) and anode chambers (3). One side of the multi-stage plate electrocatalytic membrane reactor (1) is supplied with a water storage beaker (8). The water storage beaker (8) is connected to the cathode chambers (2) and anode chambers (3) via a water guide pipe (15) to supply the reaction raw material liquid (9) to the cathode chambers (2) and anode chambers (3). The reaction raw material liquid (9) in the water storage beaker (8) is fed into the chamber of the multi-stage plate electrocatalytic membrane reactor body (1) through the peristaltic pump (16) pump pipe (14) via the water guide pipe (15) from the inlet end (5), and then sequentially passes through the porous plate conductive cathode (12) and the porous plate electrocatalytic membrane anode. (11) The electrochemical oxidation reaction is carried out step by step, and then the water flows back to the water storage beaker (8) through the outlet (6). The reaction raw material liquid (9) is circulated through the multi-stage plate electrocatalytic membrane reactor (1). The adjustable DC regulated power supply (10) is connected to the conductive pins (4) at the porous plate electrocatalytic membrane anode (11) and the porous plate conductive cathode (12) through the positive electrode wire (17) and the negative electrode wire (18), respectively. The double-connector wire (13) is connected to the conductive pins (4) at the remaining porous plate electrocatalytic membrane anode (11) and the porous plate conductive cathode (12), respectively. The water storage beaker (8) contains a rotor (19) and a magnetic stirrer (20) is placed at the bottom.

2. The plate-type multi-stage electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater according to claim 1, characterized in that: The multi-stage plate electrocatalytic membrane reactor (1) contains several uniformly alternating cathode chambers (2) and anode chambers (3). Each chamber has a conductive contact pin (4) on one side, a water inlet (5) at the bottom, and a water outlet (6) at the top.

3. The plate-type multi-stage electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater according to claim 1, characterized in that: The porous plate electrocatalytic membrane anode is a Ti / BNTA / SnO2-Sb2O3 porous electrocatalytic membrane, and the porous plate conductor cathode is a porous stainless steel plate.

4. The plate-type multi-stage electrocatalytic membrane reactor for degrading organic matter in reverse osmosis concentrate of coking wastewater according to claim 1, characterized in that: The plurality of uniformly alternating chambers are detachable plate frames, each chamber having a diameter of 5mm and a thickness of 2mm, and the spacing between each chamber being 10mm.

5. A method for degrading organic matter in reverse osmosis concentrate of coking wastewater using a multi-stage plate electrocatalytic membrane reactor, characterized in that: The process includes the following steps: 1) using the multi-stage plate electrocatalytic membrane reactor (1) as described in any one of claims 1-4 as the body for the electrochemical oxidation reaction; 2) injecting the pretreated coking wastewater reverse osmosis concentrate reaction feedstock (9) into the water storage beaker (8), and turning on the magnetic stirrer (20) so that the rotor (19) in the water storage beaker (8) rotates and stirs; 3) turning on the adjustable DC regulated power supply (10), with its positive electrode wire (17) and negative electrode wire (18) respectively connected to the conductive contact (4) at the porous plate electrocatalytic membrane anode (11) and porous plate conductive cathode (12) of one of the porous electrode pairs (7), and the double-connector wire (13) sequentially connected to the conductive contact (4) at the remaining porous plate electrocatalytic membrane anode (11) and porous plate conductive cathode (12); 4) turning on the peristaltic pump (16), The coking wastewater reverse osmosis concentrate reaction feed liquid (9) in the water storage beaker (8) is fed into the chamber of the multi-stage plate electrocatalytic membrane reactor (1) through the pump pipe (14) of the peristaltic pump (16) and the water guide pipe (15) from the inlet end (5). It flows sequentially through the porous plate conductive cathode (12) and the porous plate electrocatalytic membrane anode (11) to carry out electrochemical reaction, and then flows back to the water storage beaker (8) through the outlet end (6). The coking wastewater reverse osmosis concentrate reaction feed liquid (9) circulates through the chamber of the multi-stage plate electrocatalytic membrane reactor (1); 5) The water flows sequentially through several uniformly alternating cathode chambers (2) and anode chambers (3) of the multi-stage plate electrocatalytic membrane reactor (1) in a flow-through mode from bottom to top; 6) After running for 3-4 hours, the peristaltic pump (16), the adjustable DC regulated power supply (10), and the magnetic stirrer (20) are turned off.

6. The method according to claim 5, characterized in that: The adjustable DC regulated power supply has a voltage adjustment range of 0 to 20V.

7. The method according to claim 5, characterized in that: The current adjustment range is 0 to 5A.

8. The method according to claim 5, characterized in that: The adjustable DC regulated power supply has a current density of 20 mA / cm². 2 .

9. The method according to claim 5, characterized in that: The peristaltic pump has a rotational speed range of 0 to 150 rpm; the peristaltic pump is used to provide negative pressure inside the membrane so that the coking wastewater reverse osmosis concentrate reaction feed liquid permeates through the separation membrane from the outside to the inside.

10. The method according to claim 5, characterized in that: A magnetic stirrer is placed at the bottom of the water storage beaker, and a rotor is placed inside.

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