Electrochemical coupling micro-bubble integrated oxidation device

Abstract

This application relates to the field of industrial wastewater treatment technology, and more particularly to an electrochemically coupled microbubble integrated oxidation device. The device comprises a circulation tank, a water pump, a micro / nano reactor, and an electrochemical electrolyzer, connected in sequence to form a circulation loop. Wastewater first flows through the micro / nano reactor to enrich microbubbles before entering the electrochemical electrolyzer. A gas curtain generator is integrated at the bottom of the electrode module of the electrochemical electrolyzer. This device is configured to release a uniformly rising gas curtain between the anode and cathode plates to enhance mass transfer in conjunction with the electrochemical reaction and to clean the electrodes online. This application significantly improves treatment efficiency, effectively prevents electrode passivation, and achieves energy-saving operation by integrating pre-aeration, electrochemical oxidation, and inter-electrode gas curtain disturbance into a single process, combined with intelligent power control.

Description

Technical Field

[0001] This application relates to the field of industrial wastewater treatment, and in particular to an electrochemically coupled microbubble integrated oxidation device. Background Technology

[0002] In advanced electrochemical oxidation processes, to enhance the removal of recalcitrant organic compounds, it is typically necessary to introduce a gas (such as air or ozone) into the reaction system as a reaction promoter or direct reactant. In conventional plate electrochemical reactors, the gas is usually introduced from the bottom of the reactor and escapes upwards along the vertically arranged electrode surface in the form of microbubbles.

[0003] However, this approach has a significant drawback: uneven distribution of treatment efficiency due to the consumption of reactant gases along the process. Specifically, when wastewater carrying microbubbles enters the electrode channel from the inlet (usually at the bottom), the bubbles react violently with the electrode surface. This means that in the lower half of the electrode, the reaction rate is fast and efficient due to the high gas concentration. However, as the bubbles rise, the gas is rapidly consumed, and by the time they reach the upper half of the electrode, the number of bubbles and the concentration of effective reactants have decreased significantly.

[0004] This phenomenon directly leads to low reaction efficiency in the upper part of the electrode, and the expensive effective area of ​​the electrode is not fully utilized, limiting the improvement of processing efficiency. Simply increasing the gas intake will cause excessive gas in the lower region to escape directly, resulting in a waste of energy and reactants.

[0005] Based on the above, this application proposes an electrochemically coupled microbubble integrated oxidation device, which can effectively solve the above problems. Utility Model Content

[0006] To address the problem of reduced wastewater treatment efficiency caused by polarization of the reaction gas concentration difference between the cathode and anode in existing electrochemical wastewater treatment technologies, this application proposes an integrated electrochemically coupled microbubble oxidation device.

[0007] An electrochemically coupled microbubble integrated oxidation device includes a circulation tank, a water pump, pipelines, an electrochemical electrolyzer, and a power supply for the electrochemical electrolyzer. The device further includes: A micro / nano reactor is located between the water pump and the flow path of the electrochemical electrolysis cell, and is used to pretreat wastewater into a liquid to be treated that is rich in micro / nano bubbles; Electrode modules are disposed inside the electrochemical electrolyzer; and A gas curtain generating device is used to accommodate and fix the electrode module, and the gas curtain generating device is connected to a gas pump. The gas curtain generating device is configured to generate a gas curtain that rises along the wastewater flow direction in the gap between the electrode plates of the electrode module during the electrochemical reaction of the liquid to be treated in the electrochemical electrolytic cell.

[0008] By synergistically coupling a micro-nano reactor, an electrochemical electrolyzer, and a gas curtain generator, the wastewater is first enriched with microbubbles in the micro-nano reactor, increasing the gas-liquid contact area. Subsequently, the microbubble-rich wastewater enters the electrochemical electrolyzer for electrocatalytic oxidation. At the same time, the gas curtain generator at the bottom not only violently agitates the wastewater and breaks up concentration polarization, but also continuously cleans the electrode surface and prevents passivation, thereby effectively enhancing the wastewater treatment rate.

[0009] In one embodiment, the electrode module includes multiple parallel anode plates and multiple parallel cathode plates, which are arranged in a staggered, parallel configuration to form a comb-like structure. This comb-like structure maximizes the reaction area of ​​the anode and cathode plates within the limited volume of the electrochemical electrolyzer, while ensuring that all plates are parallel and uniformly spaced, thus guaranteeing a uniform electric field distribution between the electrodes and avoiding problems such as excessively high or low current density in certain areas.

[0010] In one embodiment, the plurality of anode and cathode plates are connected in parallel, and the number of anode and cathode plates is configured such that n is the number of anode plates and n+1 is the number of cathode plates, where n is a positive integer. Since the two outermost plates are both cathode plates, this cathode-anode-...-anode-cathode arrangement ensures that both sides of each anode plate face the cathode plate, making the electric field environment on both sides completely symmetrical. This makes the current load on the anode plate, which is the main oxidation reaction surface, more uniform, and the reaction more complete, avoiding energy waste and uneven electrode corrosion caused by edge effects.

[0011] In one embodiment, the gas curtain generating device includes an anode fixing plate and a cathode fixing plate. The anode fixing plate is located above the cathode fixing plate. Both the anode fixing plate and the cathode fixing plate are provided with equidistant slots. The plurality of anode plates and the plurality of cathode plates are respectively disposed in the slots of the anode and cathode fixing plates, ensuring that all anode plates and cathode plates maintain the same plate spacing, thus ensuring the uniformity of the electrochemical reaction environment.

[0012] In one embodiment, the cathode fixing plate has a hollow cavity inside, and the side wall of the cavity is provided with an air port connected to the air pump. Multiple air outlets communicating with the hollow cavity are opened on the surface of the cathode fixing plate facing the anode plate, and these air outlets are directly opposite the gap between the anode and cathode plates. These air outlets allow each stream of air generated by the outlet to simultaneously scour and disturb the surfaces of adjacent anode and cathode plates during its ascent. This alignment design ensures that the bubbles formed by the gas entering the wastewater can rise "point-to-point" directly below the gap between the anode and cathode plates. As the bubbles rise within the narrow gap, they create intense fluid turbulence, and their energy is fully utilized to enhance the mass transfer process within the gap and scrape the electrode surfaces on both sides, preventing ineffective gas dissipation.

[0013] In one embodiment, the electrochemical electrolyzer is provided with a bottom inlet and a top outlet to form a bottom-up main fluid path within the tank. The electrode module is partitioned along the wastewater flow direction, with different types of anode plates. A DSA electrode plate is positioned near the inlet of the electrochemical electrolyzer, and a BDD electrode plate is positioned near the outlet. When high-concentration wastewater first enters, the DSA electrode preferentially treats easily oxidizable pollutants, completing the coarse treatment stage at a lower cost. As the wastewater flows to the rear of the electrode plates, most pollutants have been removed. At this point, the BDD electrode, with its strongest oxidizing capacity, treats the most difficult-to-degrade stubborn organic matter for fine treatment. This significantly reduces the consumption of expensive BDD electrodes and overall operating costs while ensuring the quality of the final effluent.

[0014] In one embodiment, the power supply is a frequency converter, which includes a control system. A water quality sensor is installed on the circulation tank and is electrically connected to the power supply. The power supply and the water quality sensor form a closed-loop control hardware circuit based on water quality feedback. When the wastewater pollution level is high in the initial stage of treatment, the power supply operates at full power to ensure efficiency. When the wastewater pollution level decreases, the power supply automatically reduces its power output, avoiding unnecessary energy waste. This design not only reduces operating energy consumption but also avoids potential side reactions caused by over-electrolysis, improving the overall intelligence level of the device.

[0015] In one embodiment, the power supply's control system is configured such that: when the detected pollution level is higher than a preset higher threshold (first preset value), the power supply operates at its rated first power at full capacity; when the pollution level drops below this value, the power supply automatically switches to a lower second power for economical operation; and when the pollution level further decreases to a preset compliance threshold (second preset value), the power supply automatically shuts down or enters an extremely low power maintenance mode. This phased control not only maximizes energy savings but also provides clear operating status indications, facilitating operator management.

[0016] In one embodiment, the device further includes an oxygen generator, the outlet of which is connected to the inlet of the micro / nano reactor. By introducing higher purity oxygen as the gas source for the micro / nano bubbles, the dissolved oxygen concentration in the water is significantly increased, thereby enhancing the yield of highly oxidizing substances in the electrochemical electrolyzer and further accelerating the degradation rate of pollutants in the wastewater.

[0017] In one embodiment, the outlet of the electrochemical electrolyzer is connected to the circulation tank via a pipeline, thereby forming a closed circulation treatment loop together with the water pump and the micro / nano reactor. This ensures that the wastewater can be repeatedly treated through the electrochemical electrolyzer, and with each cycle, the concentration of pollutants in the wastewater is further reduced until it finally meets the standards.

[0018] The electrochemically coupled microbubble integrated oxidation device provided in this application can achieve the following technical effects: 1. By synergistically coupling the micro-nano reactor, the electrochemical electrolysis cell, and the gas curtain generator, the mass transfer efficiency of wastewater pollutants to the electrode surface is enhanced, thereby significantly improving the overall treatment efficiency. At the same time, the continuous flushing of the electrode surface by the gas curtain effectively prevents electrode passivation, thereby extending the service life of the device and improving operational stability.

[0019] 2. By setting DSA and BDD electrode plates in sections along the water flow direction, the wastewater is treated in a "coarse first, then fine" stage, thereby improving the degradation capacity of recalcitrant organic matter in the wastewater.

[0020] 3. By setting up a variable frequency power supply that is linked to the water quality sensor for control, the processing power can be allocated on demand, which significantly reduces the energy consumption of operation. At the same time, the functional units are integrated into a closed loop, which realizes the high integration of the equipment, making the device structure more compact and the operation more convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an electrochemically coupled microbubble integrated oxidation device provided in this application.

[0022] Figure 2 This is a schematic diagram of the gas curtain generator in an electrochemically coupled microbubble integrated oxidation device provided in this application.

[0023] Figure 3 This is a schematic diagram of the electrode module in an electrochemically coupled microbubble integrated oxidation device provided in this application.

[0024] Explanation of reference numerals in the attached figures: 1. Circulation tank; 11. Water quality sensor; 2. Water pump; 3. Pipeline; 4. Electrochemical electrolytic cell; 41. Liquid inlet; 42. Liquid outlet; 5. Power supply; 6. Micro / nano reactor; 61. Air inlet; 7. Electrode module; 71. Anode plate; 72. Cathode plate; 73. Metal block; 74. Wiring lug; 75. Wire; 8. Gas curtain generator; 81. Anode fixing plate; 82. Cathode fixing plate; 83. Slot; 84. Air outlet; 9. Air pump; 10. Oxygen generator; 101. Air outlet. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 This application provides a further detailed description of an electrochemically coupled microbubble integrated oxidation device.

[0026] This application discloses an electrochemically coupled microbubble integrated oxidation device, comprising a circulation tank 1 for storing and buffering wastewater to be treated, a water pump 2 providing circulation power, a pipeline 3 for wastewater circulation, an electrochemical electrolytic cell 4 serving as the core reaction site, a power supply 5 supplying power to the electrochemical electrolytic cell 4, and a micro / nano reactor 6. In this embodiment, when the wastewater treatment process is started, the water pump 2 draws wastewater from the bottom of the circulation tank 1, pressurizes it, and sends it into the micro / nano reactor 6 located in the flow path. The gas-liquid mixture treated by the micro / nano reactor 6 then enters the electrochemical electrolytic cell 4 for a deep oxidation reaction. Inside the electrochemical electrolytic cell 4, there is an inlet 41, an outlet 42, an electrode module 7, and a gas curtain generator 8. The electrode module 7 is powered by the power supply 5, while the gas curtain generator 8 is supplied with gas by an external gas pump 9. After the wastewater reacts in the electrochemical electrolysis cell 4, its outlet 42 is reconnected to the upper part of the circulation tank 1 through a pipeline, thus forming a continuously operating closed-loop treatment circuit to ensure that the wastewater can be fully and thoroughly treated.

[0027] In this embodiment, the electrode module 7 includes multiple parallel anode plates 71 and multiple parallel cathode plates 72. During assembly, the anode plates 71 and cathode plates 72 are spaced apart in an alternating and parallel manner, forming a comb-like structure similar to the teeth of two combs interlocking. This design not only effectively increases the effective reaction area of ​​the electrodes but also makes the spacing between the anode and cathode plates uniform, which is beneficial to the stable distribution of current and the uniformity of the reaction.

[0028] Specifically, the preferred configuration of the number of anode and cathode plates is as follows: if the number of anode plates 71 is n (n is a positive integer), then the number of cathode plates 72 is configured as n+1. This "cathode surrounding anode" layout (i.e., the two outermost electrodes are cathode plates 72) ensures that each anode plate 71 faces a cathode plate 72 on both sides, thereby forming a very uniform electric field and avoiding current waste caused by edge effects. In this embodiment, the preferred number of anode plates 71 is 6, and the preferred number of cathode plates 72 is 7.

[0029] More specifically, the electrode module 7 is divided into sections with different types of anode plates 71 along the wastewater flow direction. Specifically, the side near the inlet 41 of the electrochemical electrolysis cell 4 is equipped with a DSA electrode plate, which has a lower chlorine evolution potential but is more cost-effective, while the side near the outlet 42 is equipped with a BDD electrode plate, which has an extremely high oxygen evolution potential and the strongest oxidizing ability. During the wastewater treatment process, the wastewater first flows through the DSA electrode zone, where most of the easily oxidized macromolecular pollutants are efficiently removed. Subsequently, the remaining recalcitrant organic matter enters the BDD electrode zone, where it is thoroughly mineralized and decomposed by the more oxidizing free radicals generated therein. This optimizes the electrode cost while ensuring the treatment effect. In this embodiment, the preferred arrangement of the two types of electrode plates is as follows: along the wastewater flow direction, starting from the inlet 41 of the electrochemical electrolysis cell 4, the first to fourth anode plates 71 are DSA electrode plates, while the fifth and sixth anode plates 71 near the outlet 42 are BDD electrode plates. All cathode plates 72 are preferably titanium plates with strong corrosion resistance and stable chemical properties.

[0030] More specifically, multiple anode plates 71 are connected in parallel via a highly conductive metal block 73, which is typically made of copper or aluminum. The end of the metal block 73 is connected to a lug 74, which extends outward from inside the electrochemical electrolytic cell 4 and is connected to the positive terminal of the power supply 5 via a wire 75. Correspondingly, multiple cathode plates 72 are also provided with the same parallel connection and are connected to the negative terminal of the power supply 5 to form a complete parallel circuit.

[0031] In this embodiment, the gas curtain generating device 8 houses and fixes the electrode module 7, including an anode fixing plate 81 and a cathode fixing plate 82. The anode fixing plate 81 is positioned above the cathode fixing plate 82. Both the anode and cathode fixing plates have multiple equidistant slots 83 extending outwards, each slot 83 holding an electrode plate. That is, multiple parallel anode plates 71 are held on the anode fixing plate 81, and multiple parallel cathode plates 72 are held on the cathode fixing plate 82, ensuring equal gaps between all anode and cathode plates. The cathode fixing plate 82 has a hollow cavity interior, with an air port on its side wall connected to an external air pump 9. Multiple air outlets 84, communicating with the internal hollow cavity, are evenly distributed on the upper surface of the cathode fixing plate 82. During operation, air supplied by the air pump 9 enters the hollow cavity through the air port, forming a uniform air pressure within the cavity. This pressure then escapes upwards through the numerous air outlets 84 on the upper surface in the form of tiny bubbles, forming a uniform and dense gas curtain.

[0032] Specifically, the vent 84 on the upper surface of the cathode fixing plate 82 is precisely aligned directly below the gap between each pair of adjacent anode plates 71 and cathode plates 72. This design achieves two beneficial effects in the electrochemical electrolysis of wastewater: Firstly, on one side of the anode plate 71, the flow of tiny bubbles escaping from the vent 84 directly washes over the gap between the anode and cathode plates, generating violent disturbances and forced convection. This breaks the stagnant concentration polarization layer on the electrode surface, continuously pushing pollutants in the wastewater from the lower half of the anode and cathode plates to the upper half, thus greatly improving the mass transfer efficiency. Secondly, on one side of the cathode plate 72, it is known that during the electrochemical reaction, the surface of the cathode plate 72 forms a localized high pH environment due to the release of hydrogen gas from water electrolysis. This easily leads to the precipitation of hardness ions such as calcium and magnesium in the wastewater, forming an insulating scale layer. However, in this embodiment, the rising microbubble flow generated by the vent 84 forms a continuous physical scouring effect on the surface of the cathode plate 72. This scouring not only promptly removes the newly formed microscale layer, but also disrupts the localized high alkaline environment conducive to scaling through disturbance, effectively preventing the electrode from passivating and failing due to scaling, and extending the effective lifespan of the electrode module 7.

[0033] In this embodiment, two metal blocks 73 connected in parallel to the anode and cathode plates are disposed at the rear end of the anode and cathode fixing plate, and the two metal blocks 73 are located on the same vertical plane.

[0034] In this embodiment, to realize energy-saving and intelligent operation of the device, the power supply 5 is preferably a variable-frequency power supply, and the power supply 5 comprises a control system. Meanwhile, a water quality sensor 11 is installed in the circulation barrel 1, the water quality sensor 11 is preferably a COD online analyzer, the water quality sensor 11 is electrically connected to the power supply 5, and the power supply 5 is configured to adjust output power according to the COD value detected by the water quality sensor 11.

[0035] Specifically, the control system comprises a central processing unit (PLC or single-chip microcomputer) electrically connected to the power supply 5, and a preset pollutant concentration-power response curve or multi-stage threshold control logic is built in the central processing unit. The core control scheme is as follows: High-power response under high-load working conditions: when the pollutant concentration detected by the water quality sensor 11 is higher than a preset first threshold (for example, COD > 1000 mg / L), it indicates that the system is in a high organic load treatment stage. At this time, in order to maximize the pollutant removal rate per unit time and avoid anode passivation caused by mass transfer limitation and insufficient reactants, the central processing unit controls the power supply 5 to switch to a high-power output mode. In this mode, the power supply 5 operates at a relatively high constant current or a relatively high constant voltage (for example, current density 80-150 mA / cm²), ensuring that a sufficiently high concentration of strongly oxidizing species are generated on the anode surface to meet the degradation requirement of high-concentration pollutants and achieve rapid and efficient oxidative degradation.

[0036] Power optimization under medium and low load working conditions: when the pollutant concentration detected by the water quality sensor 11 drops to between a preset second threshold and the first threshold (for example, 200 mg / L < COD ≤ 1000 mg / L), the central processing unit instructs the power supply 5 to correspondingly reduce the output power to a medium level, dynamically adjust the working current or voltage to match the current pollutant concentration, and start to optimize energy consumption while ensuring an effective degradation rate.

[0037] Energy-saving operation under low-load or maintenance working conditions: when the pollutant concentration detected by the water quality sensor 11 is lower than a preset second threshold (for example, COD ≤ 200 mg / L), it indicates that most of the organic matters in the wastewater have been degraded and the system enters an advanced treatment or maintenance stage. At this time, if the device continues to operate at high power, a large amount of electric energy will be unnecessarily consumed for water electrolysis, and the loss of electrode materials may be accelerated. Therefore, the central processing unit controls the power supply 5 to switch to a low-power energy-saving mode (for example, current density 10-30 mA / cm²), so as to maintain the necessary oxidation potential, degrade residual trace pollutants, ensure that the effluent quality stably meets the standard, and at the same time minimize the energy consumption of the system and prolong the service life of the electrode.

[0038] In this embodiment, the micro / nano reactor 6 is also externally connected to an oxygen generator 10. The outlet 101 of the oxygen generator 10 is connected to the inlet 61 of the micro / nano reactor 6 via a pipeline. Thus, what enters the micro / nano reactor 6 is no longer ordinary air, but high-purity oxygen. These oxygen-enriched microbubbles have higher solubility and stability in wastewater, thereby further enhancing the ultimate oxidation capacity of the entire system.

[0039] The working principle of the electrochemically coupled microbubble integrated oxidation device provided in this application embodiment is as follows: First, the wastewater to be treated is injected into the circulation tank 1. The water pump 2 is started to draw the wastewater out of the circulation tank 1 and transport it to the micro-nano reactor 6 through the pipeline. At the same time, the oxygen generator 10 introduces gas into the micro-nano reactor 6. In the micro-nano reactor 6, the wastewater and gas mix to form a micro-nano bubble mixture, which enters the electrochemical electrolysis cell 4 for electrochemical reaction. Then, the power supply 5 is started to supply power to the electrode module 7. On the surface of the anode plate 71, through direct oxidation and indirect generation of strong oxidizing substances, the organic pollutants in the water are efficiently degraded by electrochemical advanced oxidation. At the same time, the air pump 9 is started to pressurize air into the cathode. In the cavity of the electrode fixing plate 82, gas is uniformly released through the vent holes 84 on the surface of the cavity, forming a stable and continuous rising gas curtain between each pair of cathode and anode plates 71. This curtain disturbs the micro-flow field between the electrode plates, breaks the concentration boundary layer, and transports the micro-nano bubble mixture located at the bottom of the electrode to the surface of the upper electrode to participate in the reaction. At the same time, it plays a role in physical flushing and delaying scaling on the surface of the cathode plate 72. The water treated by the electrochemical electrolysis cell 4 returns to the circulation tank 1 from the outlet 42. Through the above steps, the pollutants in the wastewater are degraded in a cyclical operation. The water quality sensor 11 in the tank monitors the water quality in real time and instructs the power supply 5 to automatically adjust the power until the water quality meets the standard and then automatically stops.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electrochemically coupled microbubble integrated oxidation device, comprising a circulation tank (1), a water pump (2), pipes (3), an electrochemical electrolytic cell (4), and a power supply (5) for supplying power to the electrochemical electrolytic cell (4), characterized in that, The electrochemically coupled microbubble integrated oxidation device also includes: A micro-nano reactor (6) is located between the water pump (2) and the electrochemical electrolysis cell (4) to pretreat wastewater into a liquid to be treated that is rich in micro-nano bubbles; Electrode module (7) is disposed inside the electrochemical electrolyzer (4); and A gas curtain generating device (8) is used to accommodate and fix the electrode module (7), and the gas curtain generating device (8) is connected to a gas pump (9). The gas curtain generating device (8) is configured to generate a gas curtain that rises along the wastewater flow direction in the gap between the electrode plates of the electrode module (7) during the electrochemical reaction of the liquid to be treated in the electrochemical electrolysis cell (4).

2. The electrochemically coupled microbubble integrated oxidation device according to claim 1, characterized in that, The electrode module (7) includes multiple parallel anode plates (71) and multiple parallel cathode plates (72). The anode plates (71) and the cathode plates (72) are arranged in parallel and alternately to form a comb-like structure.

3. The electrochemically coupled microbubble integrated oxidation device according to claim 2, characterized in that, The plurality of anode plates (71) and the plurality of cathode plates (72) are connected in parallel respectively. The number of anode and cathode plates is configured as follows: the number of anode plates (71) is n, and the number of cathode plates (72) is n+1, where n is a positive integer.

4. The electrochemically coupled microbubble integrated oxidation device according to claim 2, characterized in that, The gas curtain generating device (8) includes an anode fixing plate (81) and a cathode fixing plate (82). The anode fixing plate (81) is disposed above the cathode fixing plate (82). Both the anode fixing plate (81) and the cathode fixing plate (82) are provided with equidistant slots (83). The plurality of anode plates (71) and the plurality of cathode plates (72) are respectively disposed in the slots (83) of the anode fixing plate (81) and the cathode fixing plate (82).

5. The electrochemically coupled microbubble integrated oxidation device according to claim 4, characterized in that, The cathode fixing plate (82) has a hollow cavity inside. The side wall of the cavity is provided with an air port connected to the air pump (9). The cathode fixing plate (82) facing the anode plate (71) has a plurality of air outlets (84) communicating with the hollow cavity. The air outlets (84) are directly opposite the gap between the anode plate (71) and the cathode plate (72). The air outlets (84) allow each airflow generated by the air outlets (84) to simultaneously scour and disturb the surfaces of the adjacent anode plate (71) and cathode plate (72) during the upward process.

6. The electrochemically coupled microbubble integrated oxidation device according to claim 1, characterized in that, The electrochemical electrolysis cell (4) is provided with a liquid inlet (41) at the bottom and a liquid outlet (42) at the top to form a main fluid path from bottom to top in the cell.

7. The electrochemically coupled microbubble integrated oxidation device according to claim 6, characterized in that, The electrode module (7) is divided into sections with different types of anode plates (71) along the wastewater flow direction. A DSA electrode plate is set on the side near the liquid inlet (41), and a BDD electrode plate is set on the side near the liquid outlet (42).

8. The electrochemically coupled microbubble integrated oxidation device according to claim 1, characterized in that, The power supply (5) is a frequency converter. The power supply (5) includes a control system. A water quality sensor (11) is installed on the circulation tank (1). The water quality sensor (11) is electrically connected to the power supply (5). The power supply (5) and the water quality sensor (11) constitute a closed-loop control hardware circuit based on water quality feedback.

9. The electrochemically coupled microbubble integrated oxidation device according to claim 8, characterized in that, The control system of the power supply (5) is configured to: when the detected pollution value is higher than a first preset value, instruct the power supply (5) to operate at a first power; when the pollution value is lower than the first preset value, switch to a second power operation at a power lower than the first power; when the pollution value is lower than the second preset value, instruct the power supply (5) to shut down or switch to a low power maintenance mode.

10. The electrochemically coupled microbubble integrated oxidation device according to claim 1, characterized in that, The device also includes an oxygen generator (10), the outlet (101) of which is connected to the inlet (61) of the micro / nano reactor (6).

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