A method and device for efficiently treating organic-containing wastewater by using plasma technology in cooperation with electro-catalysis

Abstract

The application provides a method and device for efficiently treating organic-containing wastewater by using plasma technology in cooperation with electrocatalysis, and is used for treating wastewater containing microplastics and other refractory macromolecular organic matters, so that the organic matters are subjected to step-by-step deep degradation until reaching the standard. The method comprises the following steps: introducing the wastewater to be treated into a reaction zone of a plasma treatment unit; introducing an oxygen-containing gas into the reaction zone of the plasma treatment unit, and performing plasma treatment by using pulse high-voltage discharge to ionize the gas to generate high-activity substances, so that the wastewater is subjected to first degradation; introducing the wastewater subjected to the plasma treatment into a reaction zone of an electrocatalytic degradation treatment unit; in the electrocatalytic reaction zone, the wastewater is brought into contact with an electrode loaded with a catalyst, and is subjected to electrocatalytic reaction under the action of an electric field, so that the wastewater subjected to the first degradation treatment is subjected to second degradation. The application relates to the technical field of wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a method and apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis. Background Technology

[0002] Microplastics (plastic particles, fibers, or fragments with a diameter of <5 mm, including but not limited to polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polyamide (PA, such as nylon)) are widely distributed in global water bodies, primarily originating from the weathering and decomposition of plastic waste in the natural environment. Statistics show that the amount of global plastic waste has surged in the past two decades, but only 9% is recycled. A large amount of residual plastic, after being landfilled, discarded, or incinerated, gradually forms microplastics that enter water bodies. These stable microplastics accumulate continuously in aquatic environments, posing a serious threat to ecosystems and entering the human body through the food chain. They have been detected in tissues such as blood, lungs, kidneys, and placenta, with an average annual intake of over 52,000 particles per person, directly endangering human health. Microplastic pollution in water bodies has become a major environmental and health problem that urgently needs to be addressed.

[0003] Currently, technologies for treating organic pollutants (including microplastics) in water bodies are mainly divided into two categories: physical separation and chemical degradation. Physical separation primarily relies on adsorption, which can effectively enrich and achieve high-concentration separation, but cannot fundamentally eliminate organic matter and is ineffective at enriching low-concentration organic pollutants. Chemical degradation mainly involves breaking the organic polymer backbone through bond cleavage, converting organic matter into low-molecular-weight, low-toxicity products. The widespread application of photocatalysis, oxidation, and electrocatalysis is hindered by several limiting factors, including unstable degradation efficiency, high operating costs, catalyst deactivation, and difficulties in catalyst recovery.

[0004] For example, patent CN120573814A discloses a method for electrocatalytically treating pollutant BDE-47. This patent proposes an electrocatalytic method for degrading organic matter, specifically preparing a composite catalyst supported on the noble metal palladium (Pd) for degradation in an oil-water system. However, the catalyst preparation is costly, the catalytic system is complex, and there are risks of catalyst deactivation and loss.

[0005] Currently, plasma technology for treating microplastics is in the development stage, with some literature and patents published. At present, plasma technology mainly utilizes the generation of free radicals for disinfection, sterilization and surface modification. For example, the patented invention with publication number CN116081777A is a plasma active water preparation device. This invention device prepares active water using plasma technology and uses water rich in active substances to activate and disinfect bacteria and viruses.

[0006] The patent, CN103482730B, discloses an electrocatalytic wastewater treatment system. This system combines dielectric barrier discharge with electrocatalysis, resulting in a complex device that generates plasma that corrodes the catalyst, reducing its lifespan and catalytic activity.

[0007] The patent, CN120271099A, describes a method and apparatus for the degradation of organic matter through a combination of centrifugal electrocatalysis and inclined plate plasma discharge. This method involves treating the organic matter with plasma generated by microbubbles and then electrolyzing it with an electrode plate. The apparatus is complex, costly, and cannot introduce catalysts for directional conversion.

[0008] In summary, developing a highly efficient, energy-saving, cost-controllable plasma and electrocatalytic synergistic treatment technology that can achieve gradient deep degradation of organic matter has significant practical implications and application value. Summary of the Invention

[0009] To address the aforementioned problems in existing technologies, this invention combines plasma technology with electrocatalysis to treat wastewater containing recalcitrant macromolecular organic matter such as microplastics, thereby achieving tiered deep degradation of organic matter until it meets standards. Furthermore, this invention proposes a method and apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis.

[0010] The technical solution adopted by the present invention to solve the above problems is as follows:

[0011] This invention proposes a method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, comprising the following steps: Step 1: Introduce the wastewater to be treated into the reaction zone of the plasma treatment unit; Step 2: Introduce oxygen-containing gas into the reaction zone of the plasma treatment unit and perform plasma treatment using pulsed high-voltage discharge to ionize the gas and generate highly active substances to perform the first degradation of the wastewater; the first degradation includes the highly active substances breaking some of the chemical bonds of the macromolecular organic matter in the large-particle microplastics, breaking them into small molecular fragments, and causing the microplastics to disintegrate into even smaller microplastic particles.

[0012] Step 3: Introduce the plasma-treated wastewater into the reaction zone of the electrocatalytic degradation unit; Step 4: In the electrocatalytic reaction zone, the wastewater is brought into contact with the electrode supporting the catalyst, and an electrocatalytic reaction is carried out under the action of an electric field to perform a second degradation on the wastewater after the first degradation treatment. The second degradation includes further degradation of the small molecular fragments produced in the first degradation into carbon dioxide, etc., and also includes further degradation of broken small particle microplastics.

[0013] Furthermore, the wastewater containing organic matter is wastewater containing microplastics.

[0014] Furthermore, the highly reactive substances generated during the plasma treatment process include one or more of •OH, O2•–, H2O2, and singlet oxygen.

[0015] Furthermore, in step two, the voltage of the pulsed high voltage is 5-20kV and the frequency is 40-70Hz.

[0016] Furthermore, in step four, the electrode uses a SnO2-Sb coated titanium electrode as the anode and stainless steel as the cathode.

[0017] Furthermore, the current density used in the electrocatalytic treatment is 20-30 mA / cm².

[0018] This invention also proposes an apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis to achieve the above-mentioned method, the apparatus comprising: The plasma treatment unit is used for plasma treatment of wastewater. The electrocatalytic degradation treatment unit, located above the plasma treatment unit, is used for electrocatalytic treatment of wastewater after plasma treatment. The circulation unit is used to connect the plasma treatment unit and the electrocatalytic degradation treatment unit, and to transport the wastewater treated by the plasma treatment unit to the electrocatalytic degradation treatment unit.

[0019] Furthermore, the plasma treatment unit has a wastewater inlet and a gas inlet on one side, and a gas outlet on the side opposite to the gas inlet. Inside, there are multiple sets of high-voltage discharge components arranged side by side. Each set of high-voltage discharge components is connected to a high-voltage pulse power supply. The high-voltage pulse power supply is installed at the bottom of the electrocatalytic degradation treatment unit. On the upper surface of the bottom plate of the electrocatalytic degradation treatment unit, there are multiple upward-protruding power supply housings, and the high-voltage pulse power supply is installed in the housing.

[0020] Furthermore, the electrocatalytic degradation unit uses the top cover of the plasma treatment unit as its bottom surface, which can effectively cool the high-voltage pulse power supply of the plasma treatment unit.

[0021] Furthermore, each set of the high-voltage discharge components includes two high-voltage discharge tips arranged side by side, wherein the high-voltage discharge tips are tungsten needles, copper needles, or stainless steel needles.

[0022] Furthermore, the upper surface of the base plate of the electrocatalytic degradation treatment unit is provided with a power supply housing with multiple upward protrusions and waterproof function, the high-voltage pulse power supply is located inside the housing, and the outer surface of the power supply housing is provided with a protruding structure.

[0023] Furthermore, the electrocatalytic degradation treatment unit has a drain outlet on one side, and multiple parallel electrodes are arranged inside it along the water flow direction. The electrodes use SnO2-Sb coated titanium electrodes as anodes and stainless steel as cathodes.

[0024] The beneficial effects of this invention are: 1. This invention employs a tiered treatment process: plasma followed by electrocatalysis. Plasma technology excels at using highly reactive free radicals to indiscriminately attack and break the chemical bonds of large organic molecules, breaking them down into smaller fragments. Electrocatalysis, on the other hand, excels at targeted and efficient deep oxidation or reduction of these smaller fragments, ultimately bringing the wastewater up to domestic drinking water standards. The two processes work synergistically, achieving a final degradation rate of over 90%.

[0025] 2. The plasma section of this invention employs pulsed spark discharge, characterized by high voltage and low current, resulting in relatively low energy consumption. Furthermore, the plasma treatment process generates reactive substances such as •OH, O2•–, H2O2, and singlet oxygen, which partially break the chemical bonds of the large organic molecules in the microplastic particles, breaking them down into smaller molecular fragments, thus disintegrating the microplastics into even smaller particles. The electrocatalytic section further degrades these pre-treated small molecular fragments, exhibiting low reaction resistance and achieving efficient conversion at relatively mild current densities, thus optimizing the overall system energy consumption.

[0026] 3. The plasma reaction of this invention uses air or oxygen as raw material to generate active substances, eliminating the need for expensive chemical oxidants and causing no secondary pollution. The electrocatalytic treatment stage targets pre-treated small molecule fragments, eliminating the need to design and prepare catalysts for macromolecular pollutants; conventional high-efficiency catalysts can be selected, and different catalysts can be chosen based on the desired conversion products, reducing material costs.

[0027] 4. In this invention, the microplastic particles treated by the plasma unit disintegrate into smaller microplastic particles, providing a larger contact surface area and more exposed polymer end-group sites for the electrocatalytic unit. The polar functional groups at the end groups can tightly bind to the electrode surface through electrostatic interactions, coordination interactions, and hydrogen bonds, significantly improving the electron transfer efficiency between the polymer and the electrode. This avoids the electron transfer obstruction caused by the hydrophobic inertness of large polymer particles, greatly improving the electron utilization rate of electrocatalysis, and achieving high-efficiency degradation without the need for ultra-high current densities.

[0028] 5. This invention achieves energy recovery and recycling through device structural design. The pulsed high-voltage power supply is installed at the bottom of the electrocatalytic treatment unit, and its outer shell has a raised structure to enhance heat exchange. When circulating wastewater flows through this shell, it efficiently cools the power supply, ensuring its stable operation; on the other hand, the waste heat generated by the power supply is recovered by the circulating wastewater and used to preheat the influent entering the electrocatalytic reaction zone. This design not only solves the heat dissipation problem but also converts waste heat into reaction driving force, improving the electrocatalytic reaction rate, reducing the overall system energy consumption, and achieving internal optimization of energy utilization. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the device structure for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, as provided in Embodiment 1 of the present invention. Figure 2 This is a comparison diagram of the effects of plasma treatment alone and electrocatalytic treatment alone on the particle size of microplastics in Comparative Examples 1 and 2 of this invention. Figure 3 This is a comparison graph showing the change over time of the degradation rate (weight loss percentage) of microplastics by plasma treatment alone and electrocatalytic treatment alone in Comparative Examples 1 and 2 of the present invention. Figure 4 This is a comparison chart of the final degradation rate of microplastics under different treatment sequences (plasma followed by electrocatalysis vs. electrocatalysis followed by plasma) in Example 1 of the present invention. Figure 5 This is a schematic diagram of the installation of the power supply housing in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the power supply housing in Embodiment 2 of the present invention.

[0030] Figure 1 In the middle: 1-Drainage port of electrocatalytic section; 2-Air inlet of plasma section; 3-Water inlet of plasma section; 4-Plasma discharge tip; 5-Circulating water pump; 6-Exhaust port of plasma section; 7-High voltage pulse power supply; 701-Power supply housing; 702-Protruding structure; 8-Electrode. Detailed Implementation

[0031] The method and apparatus for efficiently treating wastewater containing organic matter using plasma-assisted electrocatalysis, as provided by this invention, will be described in detail below with reference to the accompanying drawings and experimental data. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0032] Example 1: 1. Equipment Design: like Figure 1As shown, a device is constructed that utilizes plasma technology in conjunction with electrocatalysis for the efficient treatment of wastewater containing organic matter. This device can be used for intermittent or continuous wastewater treatment. The intermittent treatment time and the hydraulic retention time for continuous treatment can be selected and optimized according to the microplastic content, and are not further limited here. The device includes a plasma treatment unit B, an electrocatalytic degradation treatment unit A, and a circulation unit. The plasma treatment unit B and the electrocatalytic degradation treatment unit A are integrated into the same reactor, with the electrocatalytic degradation treatment unit A located above the plasma treatment unit B. The plasma treatment unit is used to treat wastewater using plasma. One side of the unit has a wastewater inlet 3 and a gas inlet 2 (for introducing oxygen or air), while the opposite side has a gas outlet 6 and a wastewater outlet. Five sets of high-voltage discharge tips 4 are suspended from the top inside the unit, each set connected to a high-voltage pulse power supply 7. The high-voltage pulse power supply 7 is mounted on the upper surface of the base plate of the electrocatalytic degradation treatment unit and has a waterproof casing. Each set of high-voltage discharge tips 4 is preferably two tungsten needles; the needle tip can be 2-5 cm from the liquid surface.

[0033] The electrocatalytic degradation treatment unit is located above the plasma treatment unit and is used to electrocatalytically treat the wastewater after plasma treatment. The unit has a drain outlet 1 on one side and a water inlet on the opposite side. Inside, there are five sets of parallel electrocatalytic electrodes 8 arranged along the water flow direction to extend the flow path of the wastewater and make it contact the electrode surface multiple times, thereby enhancing the catalytic degradation process.

[0034] The electrode 8 uses a SnO2-Sb coated titanium electrode as the anode and stainless steel as the cathode.

[0035] A circulating water pump 5 is installed on the side of the reactor. The circulating water pump 5 is used to transport the wastewater treated by the plasma treatment unit to the electrocatalytic degradation treatment unit. The inlet of the circulating water pump 5 is connected to the outlet of the lower plasma treatment unit through a pipe, and the outlet of the circulating water pump 5 is connected to the inlet of the upper electrocatalytic degradation treatment unit through a pipe.

[0036] 2. The treatment process involves plasma treatment followed by electrocatalytic degradation, using an intermittent treatment mode. The specific steps are as follows: 2.1 A 1.0 g / L microplastic suspension was prepared and used as a simulated microplastic-containing wastewater; 2.2 Plasma treatment stage: The wastewater containing microplastics is injected from the inlet 3 of the plasma treatment unit, so that the height of the wastewater liquid level is about 8cm from the bottom of the reactor. Turn on the oxygen cylinder and introduce oxygen at a flow rate of 3 L / min through inlet 2; Turn on the high-voltage pulse power supply 7, with its input voltage at 220V; set the discharge parameters as follows: pulse voltage 10kV, frequency 50Hz; use pulse high-voltage discharge to directly discharge to the liquid surface, discharging through the high-voltage discharge tip 4 (tungsten needle tip) to the liquid surface (this stage of treatment takes 60 minutes). The generated arc ionizes oxygen into highly active substances, producing active free radicals (such as •OH, O2•–, H2O2 or singlet oxygen), which cuts off long-chain macromolecular organic matter (including microplastic-related organic matter) in the wastewater; as the generated ion wind and discharge channel are introduced into the organic wastewater, macromolecular organic matter is degraded.

[0037] This process releases some heat into the environment and introduces some water vapor into the oxygen atmosphere. Therefore, a large amount of hydroxyl radicals are generated in the system during the treatment process to synergistically degrade organic matter. During the treatment, some unreacted gases and volatile products are discharged from exhaust port 6.

[0038] 2.3 Electrocatalytic degradation stage: Start the circulating water pump 5. After plasma catalysis, the wastewater is circulated upward to the reaction zone of the upper electrocatalytic degradation unit. Turn on the electrocatalytic DC power supply and set the current density to 25mA / cm². During the flow of wastewater, it continuously contacts the electrode 8 loaded with catalyst for small molecule degradation and transformation (this stage takes 60 minutes). Gradual degradation and cyclic degradation are achieved from bottom to top.

[0039] The electrode 8 uses a SnO2-Sb coated titanium electrode as the anode and stainless steel as the cathode.

[0040] 2.4 After the treated water is discharged from drain outlet 1, a water sample can be taken and tested using an organic content detection device. If the sample meets the preset standard, it can be released; otherwise, it can undergo secondary recycling treatment. Ultimately, the wastewater will meet the standards for domestic drinking water.

[0041] 2.5. To assess degradation efficiency, the percentage of weight loss was calculated, and the mass of the microplastics (MPs) was measured after separation and removal from the treated solution. The MPs were separated by filtering the sample with filter paper. The filtrate was then dried in an oven at 60°C for 8 hours to remove moisture.

[0042] Calculate the weight loss percentage W% = (W o -W t ) / W o 100% W o It is the initial weight, W t It is the final weight after processing.

[0043] Analysis of the degradation results revealed that prior plasma treatment followed by electrocatalytic treatment significantly improved degradation efficiency, achieving a microplastic degradation rate of 90%. This treatment sequence fully leverages the advantages of both methods to achieve ideal degradation results. By utilizing the synergistic effect of plasma and electrocatalysis, and fully taking full advantage of their respective reaction characteristics, a highly efficient degradation reaction and improved device safety are achieved. This provides a highly efficient, energy-saving, and economical method and device for treating wastewater containing organic matter, exhibiting excellent treatment effects, particularly demonstrating outstanding advantages in dealing with recalcitrant pollutants such as microplastics.

[0044] Example 2: This embodiment provides a preferred implementation of the device structure to further improve the energy efficiency and operational stability of the device. For example... Figure 5 , Figure 6 As shown, the plasma discharge module releases heat during continuous operation, which can cause the high-voltage pulse power supply 7 to overheat, short-circuit, or burn out. During normal use, when the temperature reaches the upper limit of the component's operating range, the power should be cut off to cool it down before resuming operation. Therefore, in this embodiment, the high-voltage pulse power supply 7 is installed at the bottom of the electrocatalytic degradation treatment unit. The upper surface of the bottom plate of the electrocatalytic degradation treatment unit is provided with multiple upward-protruding, waterproof power supply housings 701 (preferably rectangular housings), and each high-voltage pulse power supply 7 is installed in a corresponding housing. Preferably, a protruding structure 702 is provided on the outer surface of the power supply housing 701. The protruding structure 702 consists of multiple parallel ridges on the top and side walls of the power supply housing 701. The direction of the ridges intersects with the direction of water flow to prolong the contact time between the cooling wastewater and the outer surface of the housing, increase the degree of liquid turbulence, thereby increasing heat transfer and enabling large-area heat exchange between the heat dissipation surface of the high-voltage pulse power supply 7 and the wastewater flowing above.

[0045] The other structures and connections in this embodiment, as well as the wastewater treatment process, are the same as in Embodiment 1.

[0046] Comparative Example 1: In this comparative example, no electrocatalytic treatment step was performed; only plasma treatment was conducted for 120 minutes. Everything else was the same as in Example 1. However, plasma treatment has limitations: it is more effective at treating larger microplastic particles, but after reaching a certain size, the molecules become relatively stable, preventing complete degradation and resulting in a degradation efficiency of around 60%. Figure 2 , Figure 3 As shown.

[0047] In this comparative example, the device uses a high-voltage pulse power supply from the plasma treatment unit structure installed outside the reactor; other structures and connections are the same as in Examples 1 and 2. As shown in Table 1, the temperature of the wastewater entering the electrocatalytic reaction zone changes by 10.3°C.

[0048] Comparative Example 2: Without a plasma step, electrocatalytic degradation was performed alone for 120 minutes. Everything else was the same as in Example 1. Electrocatalytic treatment of small-sized plastics was more effective, as they could fully contact the electrode surface and interact with the catalyst. Larger plastics, however, could not adhere well to the electrode surface and thus could not be fully degraded. Figure 2 , Figure 3 As shown.

[0049] In this comparative example, the device uses a high-voltage pulse power supply from the plasma treatment unit structure installed outside the reactor; other structures and connections are the same as in Examples 1 and 2. As shown in Table 1, the temperature of the wastewater entering the electrocatalytic degradation reaction zone changes by 3.3°C.

[0050] Comparative Example 3: An electrocatalytic degradation treatment followed by plasma treatment was performed (the treatment process and parameters were the same as in Example 1, only the order was different). Analysis of the degradation results showed that the electrocatalytic degradation followed by plasma treatment did not significantly improve the degradation efficiency, and the results were similar to those of the two independent treatment methods in Comparative Examples 1 and 2. Figure 4 As shown.

[0051] In this comparative example, the device uses a high-voltage pulse power supply from the plasma treatment unit structure installed outside the reactor; other structures and connections are the same as in Examples 1 and 2. As shown in Table 1, the temperature of the wastewater entering the electrocatalytic reaction zone changes by 10.6°C.

[0052] The table below compares the intermittent wastewater treatment temperature data of Example 2 and Comparative Examples 1-3: Table 1. Comparison of intermittent wastewater treatment temperature data:

[0053] As shown in Table 1, in Example 2, because the high-voltage pulse power supply 7 is located inside the waterproof casing at the bottom of the electrocatalytic degradation unit, the waste heat generated by the power supply is effectively recovered by the circulating wastewater. This recovered heat causes the temperature of the wastewater entering the electrocatalytic reaction zone to increase significantly (20.2℃). On the one hand, this reduces the temperature of the high-voltage pulse power supply 7, extends its working time, and ensures the stability of continuous operation; on the other hand, it converts the heat into the energy required for the electrocatalytic solution, reduces the required activation overpotential, and allows the reaction to proceed at a lower voltage, directly improving energy efficiency.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, characterized in that, The method includes the following steps: Step 1: Introduce the wastewater to be treated into the reaction zone of the plasma treatment unit; Step 2: Introduce oxygen-containing gas into the reaction zone of the plasma treatment unit and perform plasma treatment using pulsed high-voltage discharge to ionize the gas and generate highly active substances to perform the first degradation of the wastewater. Step 3: Introduce the plasma-treated wastewater into the reaction zone of the electrocatalytic degradation unit; Step 4: In the electrocatalytic reaction zone, the wastewater is brought into contact with the electrode supporting the catalyst, and an electrocatalytic reaction is carried out under the action of an electric field to perform a second degradation on the wastewater after the first degradation treatment.

2. The method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis according to claim 1, characterized in that, In step two, the highly reactive substances generated during the plasma treatment process include one or more of •OH, O2•–, H2O2, and singlet oxygen.

3. The method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis according to claim 2, characterized in that, In step two, the voltage of the pulsed high voltage is 5-20kV and the frequency is 40-70Hz.

4. The method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis according to claim 3, characterized in that, In step four, the electrode uses a SnO2-Sb coated titanium electrode as the anode and stainless steel as the cathode.

5. A method for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, as described in claim 4, characterized in that... In step four, the current density used for electrocatalytic degradation is 20-30 mA / cm².

6. An apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis to implement the method described in any one of claims 1 to 5, characterized in that, The device includes: The plasma treatment unit is used for plasma treatment of wastewater. The electrocatalytic degradation treatment unit, located above the plasma treatment unit, is used for electrocatalytic treatment of wastewater after plasma treatment. The circulation unit is used to connect the plasma treatment unit and the electrocatalytic degradation treatment unit, and to transport the wastewater treated by the plasma treatment unit to the electrocatalytic degradation treatment unit.

7. The apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, as described in claim 6, is characterized in that... The plasma treatment unit has a wastewater inlet (3) and a gas inlet (2) on one side, and a gas outlet (6) on the side opposite to the gas inlet (2). It has multiple sets of high-voltage discharge components arranged in parallel inside, and each set of high-voltage discharge components is connected to a high-voltage pulse power supply (7). The high-voltage pulse power supply (7) is installed at the bottom of the electrocatalytic degradation treatment unit. The upper surface of the bottom plate of the electrocatalytic degradation treatment unit is provided with multiple upward-protruding power supply housings (701), and the high-voltage pulse power supply (7) is installed in the housing.

8. The apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis according to claim 7, characterized in that, Each group of high-voltage discharge components includes two high-voltage discharge tips (4) arranged side by side.

9. The apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, as described in claim 8, is characterized in that... The upper surface of the bottom plate of the electrocatalytic degradation treatment unit is provided with a power housing (701) with multiple upward protrusions and waterproof function. The high voltage pulse power supply (7) is located inside the housing. The outer surface of the power housing (701) is provided with a protruding structure (702).

10. The apparatus for efficiently treating wastewater containing organic matter using plasma technology in conjunction with electrocatalysis, as described in any one of claims 9, is characterized in that... The electrocatalytic degradation treatment unit has a drain outlet (1) on one side, and multiple parallel electrodes (8) are arranged inside it along the water flow direction. The electrodes (8) use SnO2-Sb coated titanium electrodes as anodes and stainless steel as cathodes.

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