Composite electrocatalytic oxidation system and method for external drainage treatment

Abstract

The invention relates to an environmental engineering technology, in particular to a composite electrocatalytic oxidation system and a composite electrocatalytic oxidation method for external drainage treatment. The system comprises a pretreatment unit, an electro-catalysis reactor unit, a deep electro-catalysis unit, a flow control system unit, a monitoring and intelligent control unit, a post-treatment unit, a raw water tank and a clean water tank, the flow control system unit is connected with a pipeline of the whole system between the raw water tank and the clear water tank through a pipeline and a detector; the flow control system unit comprises a pump and a pipeline system; the monitoring and intelligent control unit is electrically connected with the flow control system unit, and monitors parameters of wastewater in each unit in real time through a sensor. Intelligent control of the system is achieved through the flow control system unit and the monitoring and intelligent control unit, the wastewater treatment efficiency and quality are improved through the electro-catalysis reactor unit and the deep electro-catalysis unit, integration of the system is achieved through modular design, and the system adapts to complex and changeable wastewater types and quality requirements.

Description

Technical Field

[0001] The invention relates to an environmental engineering technology, and in particular to a composite electrocatalytic oxidation system and method for external wastewater treatment. Background Art

[0002] With the advancement of globalization and the increase of industrial activities, water pollution has become a major environmental issue of global concern. On the one hand, developed countries have established relatively complete water treatment and recycling systems through long-term technological innovation and policy implementation, and have achieved effective management and treatment of industrial and urban wastewater. For example, the United States, Germany and other countries have achieved high standards of water purification and recycling through strict environmental protection regulations and efficient wastewater treatment technology.

[0003] On the other hand, developing countries face more severe water pollution challenges due to the rapid pace of industrialization and urbanization and the relatively backward infrastructure and technology for environmental protection. Although significant progress has been made in water pollution control and treatment in recent years, they still face serious problems in industrial wastewater and urban sewage treatment.

[0004] With the acceleration of industrialization, the treatment of industrial wastewater has become a major issue facing the environmental protection field. Although traditional biological treatment, chemical precipitation and other methods are common, they take a long time to treat, are inefficient, and cannot completely degrade certain toxic and hazardous substances. Therefore, seeking an efficient, fast, and widely applicable treatment technology for various types of industrial wastewater has become an urgent need in this field.

[0005] At present, water treatment technology at home and abroad is developing towards system integration and intelligence. Integration means combining multiple treatment technologies to improve water treatment efficiency and stability; intelligence means using sensor monitoring and automatic control technology to optimize operating parameters, reduce labor costs, and improve treatment quality. In addition, resource recycling is also becoming a new research hotspot, which can not only reduce resource consumption, but also reduce environmental pressure.

[0006] Faced with complex and ever-changing wastewater types and more stringent environmental regulations, an efficient, economical and sustainable water treatment system is urgently needed. Summary of the invention

[0007] The purpose of the present invention is to provide a composite electrocatalytic oxidation system and method for external wastewater treatment, so as to solve the problem that the existing technology is insufficiently integrated and intelligent and cannot cope with the complex and changeable wastewater types and quality requirements.

[0008] To achieve the above purpose, the following technical solution is adopted.

[0009] A composite electrocatalytic oxidation system for external wastewater treatment, comprising a pretreatment unit, an electrocatalytic reactor unit, a deep electrocatalytic unit, a flow control system unit, a monitoring and intelligent control unit, a post-treatment unit, a raw water tank, and a clean water tank;

[0010] The inlet of the pretreatment unit is connected to the raw water tank through a pipeline;

[0011] The outlet of the pretreatment unit is connected to the inlet of the electrocatalytic reactor unit through a pipeline;

[0012] The outlet of the electrocatalytic reactor unit is connected to the inlet of the deep electrocatalytic unit through a pipeline;

[0013] The deep electrocatalytic unit is used to further enhance the electrochemical oxidation of residual organic matter in the wastewater;

[0014] The outlet of the deep electrocatalytic unit is connected to the inlet of the post-treatment unit through a pipeline;

[0015] The post-treatment unit is used to further remove the residual organic matter and bacteria in the water of the deep electrocatalytic unit by using a combination of activated carbon adsorption and ultraviolet disinfection technology, so that the effluent quality meets the environmental emission standards. The outlet of the post-treatment unit is connected to the water purification tank;

[0016] The fluid control system unit is connected to the pipelines of the entire system between the raw water tank and the clean water tank through pipelines and detectors, and the fluid control system unit includes a pump and a pipeline system;

[0017] The monitoring and intelligent control unit is electrically connected to the flow control system unit, and the monitoring and intelligent control unit monitors the parameters of the wastewater in each unit in real time through sensors.

[0018] Optionally, the pretreatment unit includes a screen and a pH adjustment device;

[0019] The screen is used to remove large particles of impurities and suspended matter in the wastewater;

[0020] The pH adjusting device is used to adjust the pH of the wastewater so that the pH of the wastewater entering the electrocatalytic reactor unit is within a preset range.

[0021] Optionally, the electrocatalytic reactor unit includes a cathode and anode plates, a first power source, a first water supply pump and a flushing water pump;

[0022] The electrocatalytic reactor unit is provided with a catalytic space, the catalytic space is provided with a first water inlet and a first water outlet, and a plurality of groups of anode and cathode plates arranged evenly spaced are installed inside the catalytic space;

[0023] The anode and cathode plates are BDD electrode plates, which are used to generate a large number of hydroxyl free radicals, destroy complex organic matter in the wastewater, and promote the oxidation and elimination of organic matter in the wastewater; the power supply is used to provide stable DC voltage and current for the anode and cathode plates;

[0024] The water supply pump is used to transport the wastewater containing flocculants to the anode and cathode plates for reaction;

[0025] The flushing water pump is used to flush and maintain the anode and cathode plates after the reaction is completed.

[0026] Optionally, the deep electrocatalytic unit includes a reaction chamber, an electrode, a second water inlet, a second water outlet, a second power supply and a second water supply pump;

[0027] The reaction chamber is used to carry the electrodes and provide a reaction space between the wastewater and the electrodes;

[0028] The electrodes are arranged in multiple groups in parallel or staggered in the reaction chamber for deep electrocatalysis of wastewater. The electrodes are FCD electrodes, and the electrodes include a cathode and an anode.

[0029] The second water inlet is used to input water flow into the reaction chamber to participate in the reaction, and the second water outlet is used to output water flow to leave the reaction chamber;

[0030] The second power supply is used to provide a DC voltage or current to the electrode;

[0031] The second water supply pump is used to ensure that the wastewater passes through the electrodes at an appropriate rate.

[0032] Optionally, the fluid control system unit includes a pump, a valve, a flow meter, pipes and connectors, and a control cabinet;

[0033] The pump is used to transport wastewater into and through the various treatment units;

[0034] The valve is used to control the flow direction and flow rate of wastewater;

[0035] The flow meter is used to monitor the flow of wastewater in the system in real time;

[0036] The pipes and connectors connect the various units to form a channel for the flow of wastewater;

[0037] The control cabinet is used to receive signals from the flow meter and other sensors and automatically adjust the working states of the pump and the valve.

[0038] Optionally, the pump includes a lifting water pump, a plurality of intermediate water pumps and an external drainage pump; the lifting water pump is used to pump the wastewater in the raw water tank to the pretreatment unit; the intermediate water pump is used to transport the wastewater among the units, and the external drainage pump is used to pump the treated water in the clean water tank to the discharge system or the reuse system.

[0039] Optionally, the monitoring and intelligent control unit includes a sensor, a control module, an HMI human-machine interface, a data recorder, a communication interface, software and an algorithm;

[0040] The sensor is used to collect various data of the system status, including pH value, temperature, flow rate, and pressure;

[0041] The control module is used to receive the data transmitted by the sensor, execute the preset control logic, and optimize the system's response strategy based on machine learning and artificial intelligence technology to automatically adjust the system's operating parameters, including starting / stopping the pump, adjusting the valve opening, and controlling the electrode power supply;

[0042] The HMI human-machine interface is used to receive and display the data transmitted by the PLC and the sensor;

[0043] The data logger is used to collect and store key operating data and system performance indicators for historical data analysis, optimization of operating strategies, maintenance records and compliance reporting;

[0044] The communication interface is used for the monitoring and intelligent control unit to exchange data with an external network or other control systems.

[0045] Optionally, the pretreatment unit, the electrocatalytic reactor unit, the deep electrocatalytic unit, the flow control system unit, the monitoring and intelligent control unit, the post-treatment unit, the raw water tank and the clean water tank are modularly arranged for targeted setting according to the water quality of the raw water tank.

[0046] Optionally, the raw water tank is provided with a liquid level sensor for controlling the liquid level of the raw water tank;

[0047] The clean water tank is provided with a liquid level sensor for controlling the liquid level of the clean water tank;

[0048] The lifting water pump is provided with a frequency converter for controlling the flow rate and flow rate of the lifting water pump;

[0049] The external drainage pump is provided with a constant pressure device for controlling the flow and lift of the external drainage pump.

[0050] A composite electrocatalytic oxidation method for external wastewater treatment comprises the following steps:

[0051] The wastewater is first collected in the raw water tank, and then pumped to the pretreatment unit by the lifting pump.

[0052] In the pretreatment unit, the wastewater is preliminarily screened and precipitated to remove large particle impurities and substances that can be easily settled. The flow control system unit is started to control the flow rate and pressure of the wastewater so that the wastewater enters the electrocatalytic reactor unit at a suitable rate and conditions.

[0053] In the electrocatalytic reactor unit, wastewater is treated by BDD electrodes, and organic pollutants and some inorganic substances are removed by electrochemical reaction. At this time, the monitoring and intelligent control unit monitors the operating status of the system in real time, collects data, and automatically adjusts the working parameters of each unit to make the system run stably and achieve the optimal treatment effect. Combined with the flow control system unit, the water is dispatched into the deep electrocatalytic unit;

[0054] In the deep electrocatalytic unit, the refractory or residual pollutants that remain after treatment in the electrocatalytic reactor unit are further treated by using FCD electrodes to enhance the oxidation process, so that the pollutants in the water are completely decomposed before entering the post-treatment unit;

[0055] In the post-treatment unit, the treated water is further filtered and disinfected to make the water quality meet the discharge standards or reuse requirements, and the treated water is collected in a clean water tank and stored for use or discharge;

[0056] Finally, the external drainage pump pumps the treated water in the clean water tank to the discharge system or reuse system.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] The present invention realizes intelligent control of the system through the flow control system unit and the monitoring and intelligent control unit, improves the efficiency and quality of wastewater treatment through the electrocatalytic reactor unit and the deep electrocatalytic unit, and realizes system integration through modular design to adapt to complex and changeable wastewater types and quality requirements.

[0059] The electrocatalytic reaction is fast for wastewater treatment and can significantly degrade organic pollutants in wastewater in a short period of time, achieving a higher pollutant removal rate than the existing technology under the same conditions. For specific stubborn organic matter and heavy metals, the present invention can effectively decompose and remove them through deep electrolysis units, thereby significantly improving water quality and being applicable to a wider range of industrial wastewater types.

[0060] By utilizing innovative advanced electrocatalytic oxidation systems and intelligent flow control and process management system flow design, the present invention can consume less energy when treating the same amount of water compared to existing technologies. This not only reduces operating costs, but also reduces the impact on the environment. At the same time, the electrocatalytic reactor unit can also be used to treat various types of industrial wastewater, including wastewater from printing and dyeing, chemical, pharmaceutical and other industries.

[0061] The built-in intelligent monitoring system can collect key data in the treatment process in real time and automatically adjust the operating parameters to ensure that the water treatment system is always in the best working condition. The addition of this function makes the operation of the entire system easier and more efficient, while greatly reducing the dependence on professional operators.

[0062] No secondary pollution is generated during the treatment process: The reaction products of this reaction are safe and harmless, only CO2 and water. No secondary pollutants are generated during the treatment process, which reduces the cost of subsequent reactions.

[0063] When designing the present invention, environmental impact and sustainability were fully considered. For example, the efficient waste treatment and resource recovery technology used can convert part of the waste into secondary resources, reducing the pressure of direct waste discharge on the environment. In addition, the process flow of the present invention reduces the use of chemical reagents, further reducing potential environmental risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 The present invention is a schematic diagram of the control flow of a composite electrocatalytic oxidation system for rapid treatment of wastewater reaching standards in industrial enterprises / parks.

[0065] Figure 2 The present invention is a schematic flow chart of the steps of a composite electrocatalytic oxidation system for rapid treatment of wastewater reaching standards in industrial enterprises / parks.

[0066] Among them: 1-pretreatment unit, 2-electrocatalytic reactor unit, 3-deep electrocatalytic unit, 4-flow control system unit, 5-monitoring and intelligent control unit, 6-post-treatment unit, 7-raw water tank, 8-purification tank, 9-lifting pump, 10-external drainage pump. DETAILED DESCRIPTION

[0067] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0068] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0069] Example 1

[0070] As shown in Table 1, the pharmaceutical wastewater treatment plant is located in the industrial park and is mainly responsible for treating wastewater generated by surrounding pharmaceutical manufacturing companies. These wastewaters contain a variety of organic compounds, solvents and bioactive substances, which require special treatment before they can be safely discharged or reused, such as Figure 1 and Figure 2 The following steps are shown:

[0071] Raw water pool 7: collects wastewater from the pharmaceutical production line. The wastewater here includes cleaning water, reaction by-products and other chemical wastes in the production process. Capacity: 5,000 cubic meters to accommodate the wastewater inflow during peak periods;

[0072] Lifting pump 9: pumps wastewater from the raw water tank 7 to the pretreatment unit. It is a high-power submersible pump to ensure continuous and stable water delivery;

[0073] Pre-treatment unit: removes large particles through screens, then uses sedimentation technology to remove suspended solids, effectively reducing the pollution load and wear of subsequent treatment units, and adjusting pH;

[0074] Flow control system unit 4: accurately control the flow rate and pressure of wastewater to optimize the operating efficiency of the entire system, with high-precision flow meters and automatic regulating valves to adjust the flow in real time;

[0075] Electrocatalytic reactor unit 2: uses BDD electrodes to decompose organic pollutants through electrochemical oxidation, significantly reducing the content of toxic organic matter and converting it into harmless substances;

[0076] Deep electrocatalytic unit 3: Further treatment of refractory or residual organic pollutants, using FCD material electrodes to enhance the treatment effect, ensuring that almost all toxic organic substances are completely mineralized;

[0077] Monitoring and intelligent control unit 5: comprehensively monitor the operating status of each processing unit and adjust parameters in real time to ensure optimal operation of the system. It adopts advanced PLC and human-machine interface technology to achieve remote monitoring and automatic control;

[0078] Post-treatment unit 6: Disinfection and particle filtration of treated water to ensure that discharge standards are met, including ultraviolet disinfection equipment and microfiltration devices;

[0079] Water purification tank 8: stores fully treated water ready for discharge or reuse, equipped with water quality monitoring equipment to continuously monitor water quality status;

[0080] External drainage pump 10: transports water in the clean water tank 8 to a designated discharge system or reuse facility, with a high-efficiency pump to ensure a stable water supply.

[0081] The following steps are also included:

[0082] The effluent of the industrial wastewater treated by the adsorption and filtration unit is transported to the clean water storage tank 8, and the liquid level is monitored and adjusted by the liquid level sensor to maintain the water balance of the system;

[0083] When the liquid level in the clean water tank 8 reaches a preset value, the external drainage pump 10 is started to prepare to drain the water in the clean water tank 8;

[0084] The flow rate of the external drainage pump 10 is controlled by the monitoring and intelligent control unit 5 to discharge water to a designated water outlet location.

[0085] Specifically, the pretreatment unit 1 includes a screen and a pH adjustment device; the screen is used to remove large particles of impurities and suspended matter; and the sedimentation tank is used to further remove fine impurities to ensure that the liquid entering the electrocatalytic reactor unit 2 is clear liquid.

[0086] The electrocatalytic reactor unit 2 includes a bioreactor and a microbial flora; the bioreactor further decomposes the "pretreated" organic matter;

[0087] Microbial flora, selective cultivation of microorganisms adapted to specific pollutants, can efficiently convert organic pollutants into harmless substances;

[0088] The clean water tank 8 is provided with a liquid level sensor for controlling the liquid level of the clean water tank 8;

[0089] The lifting water pump 9 is provided with a frequency converter for controlling the flow rate and flow rate of the lifting water pump 9;

[0090] The external drainage pump 10 is provided with a constant pressure device for controlling the flow rate and lift of the external drainage pump 10 .

[0091] The electrocatalytic reactor unit 2 includes anode and cathode plates, a constant voltage and constant current power supply, a water supply pump, and a flushing water pump.

[0092] As a preferred example, it also includes a raw water tank 7, and the clean water tank 8 is provided with a liquid level sensor, and the liquid level of the entire raw water tank 7 and the clean water tank 8 can be controlled by the liquid level.

[0093] As a preferred example, an external drainage pump 10 is further included, the outlet of the clean water tank 8 is connected to the inlet of the external drainage pump 10 through a pipeline, and the outlet of the external drainage pump 10 is connected to the discharge pipeline. The external drainage pump 10 is a variable frequency constant pressure water pump device.

[0094] Table 1 Test liquid indicators

[0095]

[0096] Table 2 Water production index

[0097]

[0098] Example 2

[0099] As shown in Table 3, a composite electrocatalytic oxidation system for rapid treatment of wastewater from industrial enterprises / parks to meet standards includes the following steps:

[0100] 1. Raw pool 7

[0101] Accommodate and cache raw water: The raw water tank 7 is used to store untreated water drawn from rivers, lakes or groundwater sources. Its main function is to regulate the water flow entering the water treatment plant and provide a stable water source for downstream processing equipment.

[0102] 2. Lifting water pump 9

[0103] Hydraulic booster: Booster pumps 9 are used to transfer water from the raw water tank 7 to the higher stages of the water treatment system. These pumps provide the necessary pressure to ensure that water flows through all treatment units, especially when there are height differences in the treatment facility terrain.

[0104] 3. Preprocessing unit

[0105] Preliminary purification: including screens, sand filters and flocculant addition. The purpose of the pretreatment unit is to remove suspended matter and large particles of impurities from the water in preparation for subsequent more refined treatment.

[0106] 4. Electrocatalytic reactor unit 2

[0107] Decomposition and oxidation: Use electric current to pass through water to trigger chemical reactions, effectively decomposing organic pollutants and some inorganic substances in the water. This step is particularly suitable for organic matter that is difficult to degrade, helping to improve the subsequent treatment effect.

[0108] 5. Deep electrocatalytic unit 3

[0109] The FCD electrode is used for deep catalytic treatment to convert pollutants into CO2 and H2O. The FCD electrode is a functional conductive diamond electrode.

[0110] 6. Post-processing unit 6

[0111] The remaining residual organic matter and bacteria are further removed using a combination of activated carbon adsorption and ultraviolet disinfection technology to ensure that the effluent quality meets strict environmental emission standards.

[0112] 7. Monitoring and intelligent control unit 5

[0113] Automatic control and detection: The unit is equipped with various sensors and computer control systems to monitor water quality parameters such as pH value, turbidity, chemical oxygen demand, etc. in real time, and automatically adjust the operating conditions of each treatment unit to ensure that the water quality meets the standards.

[0114] 8. Water purification pool 8

[0115] Water quality stabilization and storage: The treated water flows into the water purification tank 8, where the water quality can be further stabilized and it also serves as a storage site for the treated water, ready for use by the water supply system at any time.

[0116] 9. External drainage pump 10

[0117] Distribute treated water: The external drainage pump 10 is responsible for delivering the treated water that meets the discharge standards to the city water supply system or directly into the natural water body. This link ensures the continuous water cycle and the rational use of water resources.

[0118] Table 3 Test liquid indicators

[0119]

[0120] Example 3

[0121] There is an industrial park in Northeast China with a water treatment capacity of 50m 3 / h, and are uniformly discharged into closed water pools for storage. After being treated to meet standards, they are shipped out of the factory and enter the municipal sewage pipeline.

[0122] The test liquid indicators are shown in Table 4:

[0123] Table 4 Test liquid indicators

[0124]

[0125] The final emission standard of the industrial park factory is required to comply with Level A of the "Pollutant Emission Standard for Urban Wastewater Treatment Plants GB18918-2002".

[0126] The water production indicators are shown in Table 5:

[0127] Table 5

[0128]

[0129]

[0130] The raw water pump specification is: Q = 50m 3 / h, H=30m.

[0131] The processing capacity of the pretreatment unit is: water volume 50m3 / h.

[0132] The electrocatalytic unit device is selected from Yinuo Environmental, model YN-UED-50.

[0133] The COD degradation efficiency of the whole set of equipment is 90%, that is, the COD value of the produced water is 1200 mg / L x (1-90%) = 120 mg / L.

[0134] The adsorption / filtration unit is from Yinuo Environmental, model YN-XF-50.

[0135] The COD degradation efficiency of the whole equipment is 90%, that is, the COD value of the produced water is 120mg / L x (1-65%) = 12mg / L.

[0136] No other waste is generated during the process.

[0137] The organic matter removal rate table is shown in Table 6.

[0138] Table 6

[0139]

[0140] By dividing the treatment into integrated continuous processes, the processing capacity of the system can be greatly improved, and the overall operating investment of the electrocatalytic oxidation equipment can be reduced, thereby reducing the operating cost of the overall system.

[0141] From the above content, it can be seen that COD can be quickly removed by electrocatalytic oxidation equipment, and the remaining molecular chains of COD can be decomposed by deep electrocatalytic unit 3, and some COD components can be degraded, and small molecules of COD are terminally degraded by electrocatalytic oxidation device. The overall process treats COD in sections, giving full play to the characteristics of each device, and is suitable for a new operation mode for high-concentration organic wastewater.

[0142] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A composite electrocatalytic oxidation system for external wastewater treatment, characterized in that: It includes a pretreatment unit (1), an electrocatalytic reactor unit (2), a deep electrocatalytic unit (3), a flow control system unit (4), a monitoring and intelligent control unit (5), a post-treatment unit (6), a raw water tank (7), and a clean water tank (8); The inlet of the pretreatment unit is connected to the raw water tank (7) via a pipeline; The outlet of the pretreatment unit is connected to the inlet of the electrocatalytic reactor unit (2) via a pipeline; The outlet of the electrocatalytic reactor unit (2) is connected to the inlet of the deep electrocatalytic unit (3) through a pipeline; The deep electrocatalytic unit (3) is used to further enhance the electrochemical oxidation of residual organic matter in the wastewater; The outlet of the deep electrocatalytic unit (3) is connected to the inlet of the post-treatment unit (6) through a pipeline; The post-treatment unit (6) is used to further remove the residual organic matter and bacteria in the water of the deep electrocatalytic unit (3) by using a combination of activated carbon adsorption and ultraviolet disinfection technology, so that the effluent quality meets the environmental emission standards. The outlet of the post-treatment unit (6) is connected to the water purification tank (8); The fluid control system unit (4) is connected to the pipelines of the entire system between the raw water tank (7) and the clean water tank (8) through pipelines and detectors, and the fluid control system unit (4) includes a pump and a pipeline system; The monitoring and intelligent control unit (5) is electrically connected to the flow control system unit (4), and the monitoring and intelligent control unit (5) monitors the parameters of the wastewater in each unit in real time through sensors.

2. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The pretreatment unit (1) comprises a screen and a pH adjustment device; The screen is used to remove large particles of impurities and suspended matter in the wastewater; The pH adjustment device is used to adjust the pH of the wastewater so that the pH of the wastewater entering the electrocatalytic reactor unit (2) is within a preset range.

3. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The electrocatalytic reactor unit (2) comprises a cathode and an anode plate, a first power source, a first water supply pump and a flushing water pump; The electrocatalytic reactor unit (2) is provided with a catalytic space, the catalytic space is provided with a first water inlet and a first water outlet, and a plurality of groups of cathode and anode plates are arranged evenly spaced apart inside the catalytic space; The anode and cathode plates are BDD electrode plates, which are used to generate a large number of hydroxyl free radicals, destroy complex organic matter in the wastewater, and promote the oxidation and elimination of organic matter in the wastewater; the power supply is used to provide stable DC voltage and current for the anode and cathode plates; The water supply pump is used to transport the wastewater containing flocculants to the anode and cathode plates for reaction; The flushing water pump is used to flush and maintain the anode and cathode plates after the reaction is completed.

4. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The deep electrocatalytic unit (3) comprises a reaction chamber, an electrode, a second water inlet, a second water outlet, a second power supply and a second water supply pump; The reaction chamber is used to carry the electrodes and provide a reaction space between the wastewater and the electrodes; The electrodes are arranged in multiple groups in parallel or staggered in the reaction chamber for deep electrocatalysis of wastewater. The electrodes are FCD electrodes, and the electrodes include a cathode and an anode. The second water inlet is used to input water flow into the reaction chamber to participate in the reaction, and the second water outlet is used to output water flow to leave the reaction chamber; The second power supply is used to provide a DC voltage or current to the electrode; The second water supply pump is used to ensure that the wastewater passes through the electrodes at an appropriate rate.

5. The composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The fluid control system unit (4) comprises a pump, a valve, a flow meter, a pipeline and connectors, and a control cabinet; The pump is used to transport wastewater into and through the various treatment units; The valve is used to control the flow direction and flow rate of wastewater; The flow meter is used to monitor the flow of wastewater in the system in real time; The pipes and connectors connect the various units to form a channel for the flow of wastewater; The control cabinet is used to receive signals from the flow meter and other sensors and automatically adjust the working states of the pump and the valve.

6. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 5, characterized in that: The pump comprises a lifting water pump (9), a plurality of intermediate water pumps and an external drainage pump (10); the lifting water pump (9) is used to pump the wastewater in the raw water tank (7) to the pretreatment unit; the intermediate water pump is used to transport the wastewater in each unit, and the external drainage pump (10) is used to pump the treated water in the clean water tank (8) to a discharge system or a reuse system.

7. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The monitoring and intelligent control unit (5) includes a sensor, a control module, an HMI human-machine interface, a data recorder, a communication interface, software and an algorithm; The sensor is used to collect various data of the system status, including pH value, temperature, flow rate, and pressure; The control module is used to receive the data transmitted by the sensor, execute the preset control logic, and optimize the system's response strategy based on machine learning and artificial intelligence technology to automatically adjust the system's operating parameters, including starting / stopping the pump, adjusting the valve opening, and controlling the electrode power supply; The HMI human-machine interface is used to receive and display the data transmitted by the PLC and the sensor; The data logger is used to collect and store key operating data and system performance indicators for historical data analysis, optimization of operating strategies, maintenance records and compliance reporting; The communication interface is used for the monitoring and intelligent control unit (5) to exchange data with an external network or other control systems.

8. The composite electrocatalytic oxidation system for external wastewater treatment according to claim 1, characterized in that: The pretreatment unit (1), the electrocatalytic reactor unit (2), the deep electrocatalytic unit (3), the flow control system unit (4), the monitoring and intelligent control unit (5), the post-treatment unit (6), the raw water pool (7) and the clean water pool (8) are modularly arranged for targeted arrangement according to the water quality of the raw water pool (7).

9. A composite electrocatalytic oxidation system for external wastewater treatment according to claim 6, characterized in that: The raw water tank (7) is provided with a liquid level sensor for controlling the liquid level of the raw water tank (7); The clean water tank (8) is provided with a liquid level sensor for controlling the liquid level of the clean water tank (8); The lifting water pump (9) is provided with a frequency converter for controlling the flow rate and flow velocity of the lifting water pump (9); The external drainage pump (10) is provided with a constant pressure device for controlling the flow rate and lift of the external drainage pump (10).

10. A composite electrocatalytic oxidation method for external wastewater treatment, based on a composite electrocatalytic oxidation system for external wastewater treatment according to any one of claims 1 to 9, characterized in that: The following steps are included: The wastewater is first collected in the raw water tank (7), and then pumped to the pretreatment unit by the lifting pump (9). In the pretreatment unit, the wastewater is preliminarily screened and precipitated to remove large particle impurities and substances that can be easily settled. The flow control system unit (4) is started to control the flow rate and pressure of the wastewater so that the wastewater enters the electrocatalytic reactor unit (2) at a suitable rate and under suitable conditions. In the electrocatalytic reactor unit (2), wastewater is treated by BDD electrodes, and organic pollutants and some inorganic substances are removed by electrochemical reaction. At this time, the monitoring and intelligent control unit (5) monitors the operating status of the system in real time, collects data, and automatically adjusts the working parameters of each unit to make the system run stably and achieve the optimal treatment effect. Combined with the flow control system unit (4), the water is dispatched to the deep electrocatalytic unit (3); In the deep electrocatalytic unit (3), the refractory or residual pollutants that remain after the treatment in the electrocatalytic reactor unit (2) are further treated by using FCD electrodes to enhance the oxidation process, so that the pollutants in the water are completely decomposed, and then enter the post-treatment unit (6); In the post-treatment unit (6), the treated water is further filtered and disinfected to make the water quality meet the discharge standard or reuse requirements, and the treated water is collected in the clean water tank (8) and stored for use or discharge; Finally, the external drainage pump (10) pumps the treated water in the clean water tank (8) to the discharge system or the reuse system.

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