Modularized electro-catalysis hydrolysis acidification reaction device and wastewater treatment method

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a modular electro-catalytic hydrolytic acidification reaction device and a wastewater treatment method. The modularized electro-catalysis hydrolytic acidification reaction device comprises a hydrolytic acidification area, an electro-catalysis area, a backflow system and a solar power supply system, the backflow system comprises a backflow pipe and a backflow channel, outlet water of the hydrolytic acidification area flows into the electro-catalysis area through the backflow pipe, and outlet water at the tail end of the electro-catalysis area flows into the hydrolytic acidification area through the backflow channel, the electro-catalysis area comprises a plurality of electro-catalysis modules which are electrically connected, each electro-catalysis module comprises an electrode assembly and an aeration device, each electro-catalysis module is divided into a micro-aerobic area and an anoxic area, and the micro-aerobic areas and the anoxic areas are alternately and continuously arranged. When the reaction device is used for treating wastewater, the function of synchronous nitrification and denitrification efficient nitrogen removal can be realized, the organic matter removal efficiency in the hydrolytic acidification stage is improved, and the biodegradability of sewage is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a modular electro-catalytic hydrolysis acidification reaction device and a wastewater treatment method. BACKGROUND

[0002] At present, many organic refractory pollutants in industrial wastewater, such as aromatic hydrocarbons, polycyclic aromatic hydrocarbons, nitrogen-containing organic matter, etc., are difficult to be completely degraded by conventional biochemical or chemical oxidation. The traditional hydrolysis acidification tank preliminarily converts the refractory macromolecular substances in wastewater into small molecular degradable substances through microbial hydrolysis acidification, improves the biodegradability of wastewater, and lays a foundation for subsequent biochemical treatment. This process is generally carried out under anaerobic / anoxic conditions, and a part of pollutants can be removed without external energy, but the deep degradation capacity of refractory organic pollutants is limited, and there is a lack of effective denitrification capacity, which is difficult to coordinate with the nitrification process, and cannot simultaneously achieve efficient removal of C, N and P pollutants.

[0003] At present, the commonly used hydrolysis acidification tank on the market mostly adopts single activated sludge method, which has simple structure but some shortcomings. The conventional hydrolysis acidification tank usually adopts single mode of filler or activated sludge, which leads to low amount of active microorganisms in the tank, low applicable organic load rate, and easy generation of a large amount of residual sludge during operation.

[0004] The principle of electro-catalytic technology is mainly to realize the mineralization or conversion of refractory organic matter into easy-biodegradable products through anode oxidation reaction (direct or indirect) and cathode reduction reaction (hydrogen, peroxide can be generated, or specific organic functional group reduction and dehalogenation can be realized) on the electrode under the action of appropriate external voltage. Electro-catalytic technology can promote the decomposition of organic pollutants through electrode oxidation / reduction reaction, and shows strong removal capacity for refractory organic matter. At present, some researches have tried to combine hydrolysis acidification and electro-catalysis for wastewater treatment, and a low-intensity electric field is applied to the reaction system by using a bioelectrochemical system, which can accelerate electron transfer, promote hydrolysis acidification reaction, and improve the biodegradability and organic matter removal rate of wastewater.

[0005] However, most electrocatalytic hydrolysis acidification devices are fixed, integrated designs. Existing combined hydrolysis acidification-electrocatalytic devices generally have fixed electrode arrangements, meaning the electrodes are integrated and continuous. This presents challenges in fault detection. If a short circuit (e.g., cathode and anode connection failure) or open circuit (e.g., wiring damage) occurs in a part of the electrocatalytic branch, timely location and maintenance are difficult. Furthermore, the lack of modular electrocatalytic reaction zones for on-demand expansion and automated fault indication limits the system's flexibility and intelligence. Most devices rely on mains power, resulting in a single power supply and a lack of green energy integration. Treatment efficiency is low, lacking an effective aerobic / anoxic alternation zone, resulting in almost no nitrogen removal. Insufficient attention is paid to optimizing nitrogen removal efficiency and further reducing system energy consumption, making it difficult to meet the stable compliance requirements of complex industrial wastewater. Therefore, there is an urgent need for an electrocatalytic hydrolysis acidification tank that is compact, low-energy, easy to operate and maintain, and also has nitrogen removal capabilities. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a modular electrocatalytic hydrolysis acidification reaction device with high structural integration, strong operational flexibility and intelligent monitoring, which shortens the process flow, reduces the footprint, and enhances the hydrolysis acidification of recalcitrant organic matter.

[0007] The technical problem to be solved by the present invention is to provide a wastewater treatment method that improves COD removal rate and total nitrogen removal rate.

[0008] To address the aforementioned technical problems, the first aspect of this invention provides a modular electrocatalytic hydrolysis acidification reaction device for treating wastewater. The device includes a hydrolysis acidification zone, an electrocatalytic zone, a reflux system, and a solar power supply system. The reflux system includes a reflux pipe and a reflux channel. Water from the hydrolysis acidification zone flows into the electrocatalytic zone through the reflux pipe, and water from the end of the electrocatalytic zone flows into the hydrolysis acidification zone through the reflux channel. The electrocatalytic zone is arranged in a U-shape above the hydrolysis acidification zone. The hydrolysis acidification zone includes a hydrolysis acidification tank, and the hydrolysis acidification tank is provided with hydrolysis acidification sludge; The electrocatalytic zone includes multiple electrically connected electrocatalytic modules. Each electrocatalytic module includes an electrode assembly and an aeration device. The electrocatalytic module is divided into a micro-aerobic zone and an anoxic zone, which are alternately and continuously arranged. The wastewater enters the hydrolysis acidification zone and undergoes organic chain breaking and biological detoxification treatment. The effluent from the hydrolysis acidification zone flows into the electrocatalytic zone and undergoes nitrification-denitrification synergistic denitrification treatment. The end effluent from the electrocatalytic zone flows into the hydrolysis acidification zone to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor.

[0009] As an improvement of the above-mentioned scheme, the hydrolytic acidification tank comprises: a hydrolytic acidification tank body, wherein the hydrolytic acidification sludge is arranged at the bottom of the hydrolytic acidification tank body; a water inlet system, which comprises a water distribution channel for uniform water inlet and a water distribution pipe connected with the water distribution channel; a water distribution system, which comprises an adjustable water distributor, a central shaft located in the hydrolytic acidification tank body, and a water distribution system, wherein the water distribution pipe is connected with the inner cavity of the central shaft to make the wastewater from the water distribution channel enter the inner part of the central shaft through the water distribution pipe; the top of the central shaft is connected with the adjustable water distributor, and the bottom of the central shaft is connected with the water distribution system, so that the wastewater in the central shaft enters the inner part of the hydrolytic acidification tank through the water distribution system; the wastewater from the end of the electro-catalytic zone flows into the water distribution system of the hydrolytic acidification zone through the reflux channel.

[0010] As an improvement of the above-mentioned scheme, the reflux channel comprises a first reflux channel and a second reflux channel, and the wastewater from the hydrolytic acidification zone enters the electro-catalytic zone through the reflux pipe; the first reflux channel is a pump reflux channel, which comprises a first reflux pipe and a centrifugal pump, wherein the centrifugal pump is connected with the first reflux pipe, part of the wastewater from the electro-catalytic zone is refluxed to the adjustable water distributor through the centrifugal pump to be mixed with the newly-inlet wastewater and be treated again, and an electromagnetic flowmeter is further arranged on the first reflux pipe; the second reflux channel is a gas stripping channel, which comprises a second reflux pipe and a gas supply device, wherein the gas supply device is connected with the second reflux pipe, part of the wastewater from the electro-catalytic zone is refluxed to the water distribution channel through the gas supply device to be mixed with the newly-inlet wastewater and be treated again.

[0011] As an improvement of the above-mentioned scheme, baffles are arranged between the electro-catalytic modules, and the baffles are alternately and separately arranged along the horizontal direction or the vertical direction; each electro-catalytic module further comprises an indicator lamp, which is electrically connected with the electrode assembly; the aeration device comprises an aeration disc, an aeration hose and a blowing device, wherein the aeration disc is connected with the blowing device through the aeration hose; the electrode assembly comprises a pair of electrode plates, which are composed of a support and an electro-catalytic filler fixed on the support, wherein the electro-catalytic filler is a carbon fiber electro-catalytic filler.

[0012] As an improvement of the above-mentioned scheme, the hydrolytic acidification tank further comprises a sludge discharge system arranged at the bottom of the hydrolytic acidification tank body for discharging the hydrolytic acidification sludge in the hydrolytic acidification tank body.

[0013] As an improvement of the above-mentioned scheme, the modular electro-catalytic hydrolytic acidification reaction device further comprises a water outlet system arranged at the upper portion of the hydrolytic acidification tank. The water outlet system comprises a water outlet groove and a water outlet tank, and the water outlet of the modular electro-catalytic hydrolytic acidification reaction device is collected in the water outlet tank through the water outlet groove.

[0014] As an improvement of the above-mentioned scheme, the solar power supply system is arranged above the hydrolytic acidification zone. The solar power supply system comprises a solar cell group, a battery group and a controller. The solar power supply system is electrically connected with the hydrolytic acidification zone and the electro-catalytic zone.

[0015] As an improvement of the above-mentioned scheme, the modular electro-catalytic hydrolytic acidification reaction device further comprises an intelligent control system connected with the hydrolytic acidification zone, the electro-catalytic zone and the solar power supply system. The intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, and the monitoring probe comprises a DO monitor, an ORP monitor, a pH monitor, a flow monitor and an electric conductivity monitor.

[0016] The second aspect of the present application further provides a wastewater treatment method, which adopts the modular electro-catalytic hydrolytic acidification reaction device to treat wastewater, and the treatment method comprises the following steps: (1) passing the wastewater into the hydrolytic acidification zone to perform hydrolytic acidification treatment on the wastewater; (2) passing the wastewater treated by the hydrolytic acidification zone into the electro-catalytic zone through a reflux pipe to perform electro-catalytic treatment on the wastewater; (3) refluxing the water outlet at the end of the electro-catalytic zone to the hydrolytic acidification zone through a reflux channel to adjust the residence time of the wastewater in the modular electro-catalytic hydrolytic acidification reaction device; (4) discharging the water outlet treated by the modular electro-catalytic hydrolytic acidification reaction device.

[0017] As an improvement of the above-mentioned scheme, in the electro-catalytic zone, the working voltage of the electrode assembly is 0.3V~2V, and the current is 5mA~20mA. The electro-catalytic zone is connected with an intelligent control system, the intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, the monitoring probe in the intelligent control system comprises a pH monitor, a DO monitor and an ORP monitor, so that the ORP value in the electro-catalytic zone is controlled to be-200 mV-100 mV, and the pH is controlled to be 6.5-8, wherein the DO value in the micro-aerobic zone is 0.2 mg / L-0.5 mg / L, the ORP value in the micro-aerobic zone is-100 mV-100 mV, and the ORP value in the anoxic zone is-200 mV--50 mV; The hydrolysis acidification zone is connected with an intelligent control system, the intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, the monitoring probe in the hydrolysis acidification zone comprises an ORP monitor and a DO detector, so that the ORP value in the hydrolysis acidification tank is controlled to be-400 mV-0 mV, the pH value is controlled to be 6.5-8, and the DO value is less than or equal to 0.2 mg / L; The residence time ratio of the wastewater in the hydrolysis acidification zone and the electro-catalytic zone is 1: (0.1-0.3).

[0018] The present application has the following beneficial effects: (1) The modular electro-catalytic hydrolysis acidification reaction device utilizes the hydrolysis acidification zone and the electro-catalytic zone to realize the nitrification-denitrification denitrification function, improves the organic matter removal efficiency in the hydrolysis acidification stage, enhances the biodegradability of the wastewater, improves the adaptability and strengthening ability of the wastewater. At the same time, the electro-catalytic zone is arranged in a back shape above the hydrolysis acidification zone to form a single tank structure, which is compact in structure and constitutes a single cycle of hydrolysis acidification treatment and electro-catalytic treatment, integrates multiple processing functions, and saves the land area occupied by the device.

[0019] (2) The modularization of the electro-catalytic zone has strong operation flexibility, each module can be independently started and stopped, and the number of electro-catalytic modules can be increased or decreased according to the processing capacity demand, which flexibly adapts to the change of water quality and has good application range and promotion value. The aeration device is combined with the modular design, and a single or multiple electro-catalytic modules form an electro-catalytic module group, through the partition control valve and aeration control, the anoxic / micro-aerobic alternating operation of different electro-catalytic modules in the same electro-catalytic zone is realized, the efficiency of nitrification-denitrification synergistic denitrification is improved, and the biochemical stability in the reaction device is enhanced.

[0020] (3) The double reflux channels are adopted in the reflux system, which can effectively reduce the energy consumption and optimize the ORP regulation, increase the adjustability of the reflux ratio and the impact resistance of the load fluctuation.

[0021] (4) The detachable electro-catalytic module and the indicator light can realize rapid positioning of the line fault in a single electrode assembly or a single pair of electrode plates, and when the wire in the electrode assembly is disconnected or the power supply is abnormal, the indicator light prompts the maintenance personnel to pay attention to inspection, so that the maintenance and replacement are facilitated, and the operation and maintenance operation is simplified.

[0022] (5) A new energy supply mode is adopted, and a solar power supply module is matched, so that carbon emission and energy consumption can be reduced, and the overall operation efficiency of the system can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 : The top view of the modular electro-catalytic hydrolysis acidification reaction device in the application; Figure 2 : The sectional view of the modular electro-catalytic hydrolysis acidification reaction device in the application in one direction; Figure 3 : The sectional view of the modular electro-catalytic hydrolysis acidification reaction device in the application in another direction; Figure 4 : The structure schematic view of the baffle arranged in different directions between the electro-catalytic modules in the application; Figure 5 : The structure schematic view of the second reflux channel in the application; Figure 6 : The structure schematic view of the solar power supply system in the application.

[0024] Figure 7 : The COD removal effect diagram before and after the kitchen waste biogas liquid wastewater treatment; Figure 8 : The total nitrogen removal effect diagram before and after the kitchen waste biogas liquid wastewater treatment; Figure 9 : The ammonia nitrogen removal effect diagram before and after the kitchen waste biogas liquid wastewater treatment; Figure 10 : The microbial community diagram in the modular electro-catalytic hydrolysis acidification reaction device; Figure 11 : The COD removal effect diagram before and after the mixed wastewater (containing photovoltaic manufacturing wastewater) treatment in the industrial park; Figure 12 : The total nitrogen removal effect diagram before and after the mixed wastewater (containing photovoltaic manufacturing wastewater) treatment in the industrial park.

[0025] Reference signs: 1-hydrolysis acidification zone; 11-hydrolysis acidification tank; 12-water inlet system; 121-water distribution channel; 122-water distribution pipe; 13-water distribution system; 131-adjustable water distributor; 132-central vertical shaft; 133-water distribution system; 14-sludge discharge system; 2-electrocatalysis zone; 21-electrocatalysis module; 211-electrode assembly; 2111-electrode plate; 212-aeration device; 213-air blowing device; 22-indicator light; 23-baffle; 3-backflow system; 31-backflow pipe; 32-first backflow channel; 321-first backflow pipeline; 322-centrifugal pump; 323-electromagnetic flowmeter; 33-second backflow channel; 331-second backflow pipeline; 332-gas supply device; 4-solar power supply system; 41-solar cell group; 42-battery group; 43-controller; 5-intelligent control system; 51-monitoring station; 52-monitoring probe; 6-water outlet system; 61-water outlet tank; 62-water outlet tank. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail with specific embodiments.

[0027] To solve the above problems, the present application provides a modular electrocatalytic hydrolysis acidification reaction device, please refer to Figures 1-3 , which is used for treating wastewater and comprises a hydrolysis acidification zone 1, an electrocatalysis zone 2, a backflow system 3 and a solar power supply system 4. The backflow system 3 comprises a backflow pipe 31 and a backflow channel. The effluent of the hydrolysis acidification zone 1 flows into the electrocatalysis zone 2 through the backflow pipe 31, and the terminal effluent of the electrocatalysis zone 2 flows into the hydrolysis acidification zone 1 through the backflow channel. The electrocatalysis zone 2 is arranged in a U shape above the hydrolysis acidification zone 1. The wastewater enters the hydrolysis acidification zone 1 and is subjected to organic matter breaking and biological detoxification treatment. The effluent of the hydrolysis acidification zone 1 flows into the electrocatalysis zone 2 and is subjected to nitrification-denitrification synergistic denitrification treatment. The terminal effluent of the electrocatalysis zone 2 flows into the hydrolysis acidification zone 1 to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reaction device. It should be noted that the wastewater in the present application can be municipal wastewater or park wastewater, or a mixture of municipal wastewater and park wastewater.

[0028] In the present application, the hydrolysis acidification zone 1 and the electrocatalysis zone 2 cooperatively realize nitrification-denitrification denitrification function in the wastewater treatment process of the modular electrocatalytic hydrolysis acidification reaction device, thereby improving the hydrolysis acidification efficiency and the adaptability and strengthening ability to wastewater. At the same time, the electrocatalysis zone 2 is arranged in a U shape above the hydrolysis acidification zone 1, and the backflow system 3 is arranged to form a separate cycle of hydrolysis acidification treatment and electrocatalysis treatment, thereby integrating multiple treatment functions and saving the land area occupied by the device.

[0029] Preferably, the modular electro-catalytic hydrolysis acidification reaction device further comprises an intelligent control system 5 connected with the hydrolysis acidification zone 1, the electro-catalytic zone 2 and the solar power supply system 4. The intelligent control system 5 can be a PLC intelligent control system.

[0030] Further, the intelligent control system 5 comprises a monitoring station 51 and a monitoring probe 52 electrically connected with the monitoring station 51; the monitoring probe 52 includes but is not limited to a DO monitor, an ORP monitor, a pH monitor, a flow monitor and a conductivity monitor. By real-time monitoring of the pH, oxidation-reduction potential (ORP), dissolved oxygen (DO) concentration in water and conductivity in the reaction system of each unit, the node data is uploaded to the PLC at a frequency of 1 min / time, and is refreshed to the monitoring station 51 in real time, so as to realize whole-process monitoring, adjust the reaction system in time, meet the required reaction conditions in each unit, control the reaction progress and improve the degradation efficiency of wastewater.

[0031] The hydrolysis acidification zone 1 comprises a hydrolysis acidification tank 11, and the hydrolysis acidification tank 11 is provided with hydrolysis acidification sludge (not shown in the figure). Microorganisms decompose macromolecular organic matter in wastewater into small molecular substances through hydrolysis acidification. The hydrolysis acidification sludge is anaerobic sludge mainly for hydrolysis acidification, and there are also denitrification sludge using different electron donors and acceptors (such as different valence states of sulfur), i.e. there are mainly some bacteria consuming / decomposing organic matter in the hydrolysis acidification sludge, such as anaerobic bacteria, fermentation and hydrolysis bacteria and obligate acid-producing bacteria, and there are also some denitrifying bacteria. In some embodiments, the abundance of functional bacteria for organic matter decomposition in the hydrolysis acidification sludge can be more than 60%, and the abundance of denitrifying bacteria is about 1% to 2%. The hydrolysis acidification sludge can be flocculent or granular, and specifically, the hydrolysis acidification sludge can be provided as a hydrolysis acidification sludge expanded bed at the bottom of the hydrolysis acidification tank 11, and the height of the hydrolysis acidification sludge expanded bed is 45% to 75% of the height of the hydrolysis acidification tank 11.

[0032] It should be noted that the hydrolysis acidification sludge in the hydrolysis acidification zone 1 needs to be subjected to hydrolysis acidification reaction in cooperation with pH, ORP and other control means, therefore, the hydrolysis acidification tank 11 is also connected with an intelligent control system 5, the intelligent control system 5 comprises a monitoring station 51, and a monitoring probe 52 electrically connected with the monitoring station 51; the monitoring probe 52 comprises an ORP monitor, a pH monitor and a DO detector, so as to control the ORP value of the hydrolysis acidification tank 11 to be-400mV~0mV, the pH value to be 6.5~8, and the DO value to be less than or equal to 0.2mg / L, so as to create a favorable environment for the hydrolysis acidification process, so that the functional microorganisms decompose the refractory organic matter under suitable conditions, promote the reduction detoxification of the refractory organic matter, improve the decomposition efficiency, block the aerobic metabolic pathway of the facultative bacteria, inhibit the activity of the aerobic bacteria, ensure the integrity of the hydrolysis acidification products, and provide sufficient substrate for the subsequent electro-catalytic reaction.

[0033] Further, the hydrolysis acidification tank 11 comprises a hydrolysis acidification tank body (not shown in the figure), the hydrolysis acidification sludge is arranged at the bottom of the hydrolysis acidification tank body; a water inlet system 12, the water inlet system 12 comprises a water distribution channel 121 for uniform water inlet, and a water distribution pipe 122 connected with the water distribution channel 121; a water distribution system 13, the water distribution system 13 comprises an adjustable water distributor 131, a central shaft 132 and a water distribution system 133, the central shaft 132 is located in the hydrolysis acidification tank body, the water distribution pipe 122 is in communication with the inner cavity of the central shaft 132, so that the wastewater enters the central shaft 132 from the water distribution pipe 122 through the water distribution channel 121; the top of the central shaft 132 is in communication with the adjustable water distributor 131, and the bottom of the central shaft 132 is in communication with the water distribution system 133, so that the wastewater in the central shaft 132 enters the hydrolysis acidification tank 11 through the water distribution system.

[0034] Specifically, the effluent at the end of the electro-catalytic zone 2 flows into the water distribution system 133 of the hydrolysis acidification zone 1 through the reflux channel, the water inlet of the water distribution pipe 122 is in communication with the water distribution channel 121, and the water outlet is in communication with the inner cavity of the central shaft 132, so that the wastewater enters the central shaft 132 from the water distribution pipe 122 through the water distribution channel 121, under the action of the adjustable water distributor 131, the wastewater in the central shaft 132 can be pulsed and distributed, so that the bottom expanded sludge particles are fully suspended, forming a sludge expanded bed, improving the contact efficiency of the organic matter and the sludge, under the action of the water distribution system 133, the wastewater delivered by the central shaft 132 flows through the hydrolysis acidification sludge layer from bottom to top, promoting the mixing of the sludge to form a stable sludge expanded bed.

[0035] In some embodiments, the hydrolysis acidification tank can be a concrete tank with a depth of about 7m to 12.5m, and an area designed according to the amount of water to be treated. A 2m to 4m space above the liquid surface is designed as a clarification zone, and the lower part is a sludge bulking bed zone. The height of the sludge bulking bed can be 50% to 75% of the depth of the tank. The water distribution system 133 includes water distribution pipes (not shown in the figure) and vortex water distributors (not shown in the figure) connected to the inner cavity of the central shaft 132. The vortex water distributors can be arranged at equal intervals at the bottom of the hydrolysis acidification tank. The diameter of the vortex water distributor can be 0.6m, and the service area of the water distributor can be 2.5m 2 ~4.0m 2 The central shaft 132 of the tank body pulses water every 2 to 5 minutes. The diameter of the adjustable water distributor 131 can be 1.1m to 1.3m.

[0036] Further, the hydrolysis acidification tank 11 further comprises a sludge discharge system 14 arranged at the bottom of the hydrolysis acidification tank body for discharging sludge in the hydrolysis acidification tank body. By regularly opening the sludge discharge system 14, the settled sludge at the bottom of the hydrolysis acidification tank 11 is extracted, which ensures efficient degradation of wastewater by microorganisms in the sludge at the bottom and timely discharge of acidification products to avoid consumption of ineffective carbon sources. Specifically, the biomass level of the system can be maintained by monitoring the sludge concentration and VSS value, where VSS value refers to the organic components in the sludge that can be burned and volatilized at a high temperature of 600℃.

[0037] The electro-catalytic zone 2 comprises a plurality of electrically connected electro-catalytic modules 21, each of which comprises an electrode assembly 211 and an aeration device 212. The electro-catalytic modules 21 are divided into micro-aerobic zones and anoxic zones, which are arranged alternately and continuously. It can be understood that when the aeration device 212 is working, a micro-aerobic zone is formed, and when the aeration device 212 is not working, an anoxic zone is formed. The plurality of electro-catalytic modules 21 provided in the electro-catalytic zone 2 can be arranged in series, and the arrangement of the electrode assembly 211 can enhance the hydrolysis acidification efficiency.

[0038] In this invention, the electrocatalytic zone 2 is composed of multiple electrically connected electrocatalytic modules 21, which are arranged in a U-shape. Wastewater after hydrolysis and acidification treatment flows into the reaction zone of the first electrocatalytic module 21 and flows out after passing through the reaction zones of multiple electrocatalytic modules 21 in sequence. During the reaction, a low-voltage electric field is applied to the electrocatalytic modules 21, which can accelerate the electrochemical reaction of organic matter and the electron transfer of microorganisms, promote the hydrolysis of high molecular organic matter into easily degradable small molecules, increase the yield of volatile fatty acids, and effectively improve the degradation and denitrification efficiency of organic matter. Moreover, the modular setting of the electrocatalytic zone 2 provides strong operational flexibility. Each module can be started and stopped independently, and the number of electrocatalytic modules 21 can be increased or decreased according to the treatment volume requirements, which can flexibly adapt to changes in water quality. It has a good scope of application and promotion value.

[0039] Furthermore, the aeration device 212 is combined with a modular design, simultaneously coupling micro-aeration and electrocatalysis in the electrocatalytic zone 2. Single or multiple electrocatalytic modules 21 form an electrocatalytic module group. Through zone control valves and aeration control, the different electrocatalytic modules 21 in the same electrocatalytic zone 2 can operate alternately in anoxic / micro-aerobic (A / O) conditions. A constant current electric field is applied to further promote microbial electron transfer, achieving deep coupling between the anode / cathode as the terminal electron acceptor and microbial metabolism, and breaking down and mineralizing recalcitrant organic molecules. Among these, the micro-aerobic environment can promote the activation of acid-producing bacteria and the secretion of hydrolytic enzymes, efficiently converting complex organic matter into volatile fatty acids, while the A / O alternation enhances the nitrification-denitrification process. Both accelerate COD degradation and volatile fatty acid (VFA) production, improve total nitrogen removal efficiency, and enhance the biochemical stability within the reaction device.

[0040] Specifically, the electrode assembly 211 includes paired electrode plates 2111, which become paired cathode and anode plates after being energized. Each electrode plate 2111 consists of a support and electrocatalytic filler fixed to the support. After corrosion protection treatment, it is used stably, providing positioning and support. The electrocatalytic filler is a carbon fiber electrocatalytic filler, providing a large surface area for microbial attachment. The carbon fiber electrocatalytic filler can be woven from carbon fiber, specifically in bundle or mesh form. The support can be made of polypropylene (PP) or carbon steel. In some embodiments, in each electrocatalytic module 21, the electrode assembly 211 may specifically include 2 to 10 pairs of cathode and anode plates. The spacing between adjacent electrode plates 2111 is 50 mm to 150 mm. The number of electrode plates 2111 can be specifically set according to actual conditions. Each pair of electrode plates 2111 is connected to an external junction box via a lead wire, and the junction box is then connected to a regulated DC power supply.

[0041] The aeration device 212 includes an aeration disc (not shown in the figure), an aeration hose (not shown in the figure) and a blowing device 213, and the aeration disc is connected with the blowing device 213 through the aeration hose. A plurality of aeration discs can be arranged in each of the electro-catalytic modules 21, and the oxygen transfer and oxygen utilization rate are improved through the action of the aeration hose and the blowing device 213, the uniform distribution of dissolved oxygen in the single electro-catalytic module 21 is enhanced, and the micro-aerobic zone and the anoxic zone can be flexibly adjusted according to the actual situation. The aeration disc includes but is not limited to a plate-type micro-porous aeration disc, and the number of the aeration disc can be specifically arranged according to the actual situation. In some embodiments, 4-10 aeration discs are arranged in each electro-catalytic module 21.

[0042] Further, each of the electro-catalytic modules 21 further includes an indicator light 22, which is electrically connected with the electrode assembly 211, and is used to indicate whether the electrode assembly 211 fails, and can play a role as an online fault diagnosis system, and further forms a single electro-catalytic module 21 with the electrode assembly 211 and the aeration device 212. The arrangement of the detachable electro-catalytic module 21 and the indicator light 22 can realize the rapid positioning of the line fault in the single electrode assembly 211 or the single pair of electrode plates 2111, and when the wire in the electrode assembly 211 appears open circuit or power anomaly, the indicator light 22 prompts the maintenance personnel to pay attention to check, which is convenient for maintenance and replacement and simplifies the operation and maintenance. In the single electro-catalytic module 21, the number of the indicator light 22 can be one or more. In some embodiments, in the single electro-catalytic module 21, the number of the indicator light 22 is 1, and specifically can be installed on a group of electrode assemblies 211. In some embodiments, in the single electro-catalytic module 21, the number of the indicator light 22 is more, and specifically can be installed on each pair of electrode plates 2111.

[0043] Further, please refer to Figure 4The baffles 23 are arranged between the electro-catalytic modules 21 to achieve hydraulic isolation, so that the wastewater flowing out of one electro-catalytic module group must be turned over to enter the next electro-catalytic module group, ensuring hydraulic isolation and sequential flow, and sequentially passing through the micro-aerobic zone and the anoxic alternating unit. The baffles 23 are arranged alternately in the horizontal direction or in the vertical direction to force the water flow to turn over and enter the next electro-catalytic module group. In some embodiments, the baffles 23 can be arranged corresponding to the anoxic zone and the micro-aerobic zone. Taking three electro-catalytic modules 21 as an example, the first electro-catalytic module 21, the second electro-catalytic module 21 and the third electro-catalytic module 21 form an electro-catalytic module group 1, the fourth electro-catalytic module 21, the fifth electro-catalytic module 21 and the sixth electro-catalytic module 21 form an electro-catalytic module group 2, and the seventh electro-catalytic module 21, the eighth electro-catalytic module 21 and the ninth electro-catalytic module 21 form an electro-catalytic module group 3. If the electro-catalytic module group 1 is aerated, the electro-catalytic module group 1 is the micro-aerobic zone, the electro-catalytic module group 2 is the anoxic zone, and the electro-catalytic module group 3 is the micro-aerobic zone. If the electro-catalytic module group 1 is not aerated, the electro-catalytic module group 1 is the anoxic zone, the electro-catalytic module group 2 is the micro-aerobic zone, and the electro-catalytic module group 3 is the anoxic zone, thereby forming a plurality of continuous alternating A / O zones. The baffles 23 can be arranged between the electro-catalytic module group 1 and the electro-catalytic module group 2 and between the electro-catalytic module group 2 and the electro-catalytic module group 3.

[0044] It should be noted that the electro-catalytic reaction in the electro-catalytic zone 2 needs to be matched with the control means of pH, ORP, DO, conductivity, etc., therefore, the electro-catalytic zone 2 is also connected with the intelligent control system 5. Specifically, the intelligent control system 5 includes a monitoring station 51, and a monitoring probe 52 electrically connected with the monitoring station 51; the monitoring probe 52 includes a pH monitor, an ORP monitor and a DO detector, so as to control the ORP value in the electro-catalytic zone 2 to be-200mV~100mV, and the pH to be 6.5~8; specifically, the DO value in the micro-aerobic zone is controlled to be 0.2mg / L~0.5mg / L, and the ORP value is-100mV~100mV, and the ORP value in the anoxic zone is-200mV~-50mV, and the aeration valve of each electro-catalytic module 21 is automatically opened and closed according to the ORP setting value in the micro-aerobic zone, so as to provide a micro-oxygen environment for the hydrolysis acidification reaction, and realize a dynamic A / O alternating operation strategy, which is beneficial to the nitration and denitrification reactions in different electro-catalytic modules 21 in turn, and improves the total nitrogen removal efficiency. In addition, the intelligent control system 5 can also switch the aeration state in the A / O zone according to the set period, prevent the sludge from depositing in the anoxic zone, and use the aeration bubbles to periodically clean the electro-catalytic filler, so as to maintain the activity of the microorganisms on the surface of the electro-catalytic filler and the smoothness of the conductive channel. In this process, the monitoring probe 52 includes a conductivity detector, in the electro-catalytic reaction process, the current is affected by the conductivity of the water body, if the conductivity of the water body is too high, the voltage and current size can be appropriately reduced to prevent the filler from over-discharging, therefore, the conductivity monitoring is mainly to ensure that the current and voltage of the electro-catalysis are within the appropriate range. But the conductivity of different wastewater qualities is different, and the present application does not limit the range thereof.

[0045] Further, the monitoring probe 52 also includes an electrode current / voltage detection module to control the electrode power supply. Taking the example of installing an indicator light 22 for each pair of electrode plates 2111, a sampling resistor is connected in series between the negative electrode and the negative electrode of the power supply, and the voltage across the sampling resistor is converted by a differential amplifier into a 0V~5V analog signal to be sent to the PLC analog input. The PLC sets the discrimination logic for open circuit (voltage≈0), short circuit (voltage>threshold) and current efficiency decay (>±10% drift), and once any condition is triggered, a digital signal is output from the PLC to the control end of the fault indicator light 22. The indicator light 22 specifically uses a three-color LED module, which internally integrates green, red and blue chips, with green always on, indicating that all electrode assemblies 211 are normally powered on; red is always on, indicating that an open circuit has been detected; red flickers, indicating that a short circuit or current efficiency has been detected; and blue flickers, indicating that the sampling resistor or sensor reading is abnormal. The program of the intelligent control system 5 has an AI algorithm model built-in, which is based on historical DO values, ORP values, current values and voltage values to predict electrode pollution or blockage risks and automatically adjust the potential of each module when necessary, or issue a maintenance reminder. Of course, the intelligent control system 5 can also be provided with a human-machine interface or remote monitoring function to adjust the operating parameters or issue real-time alarms.

[0046] The reaction zone of the electro-catalytic zone 2 described in the present application is divided into modules, each module is equipped with an independent circuit and a fault indicator light 22, and under the assistance of the intelligent control system 5, real-time monitoring and fault visualization are realized, the fault module is quickly diagnosed and replaced when a short circuit or open circuit occurs, the maintenance downtime is reduced, and the operation and maintenance are simplified.

[0047] The reflux system 3 includes a reflux pipe 31 and a reflux channel, and the reflux channel includes a first reflux channel 32 and a second reflux channel 33. The reflux pipe 31 is arranged above the hydrolysis acidification tank 11. In the hydrolysis acidification tank 11, the wastewater reaches the relatively clear area in the middle and upper part after passing through the sludge expanded bed, and the reflux pipe 31 arranged at this position collects the effluent of the hydrolysis acidification tank 11 and enters the electro-catalytic zone 2. Exemplarily, the reflux pipe 31 can be arranged at a position 2.5m~4.5m away from the water surface of the hydrolysis acidification tank (i.e. about 0.5m below the clarification zone), and the wastewater enters the hydrolysis acidification zone 1, rises from the bottom, contacts and reacts with the sludge expanded bed, and is collected by the reflux pipe 31 and flows into the reaction zone of the first electro-catalytic module 21 from the inlet of the electro-catalytic unit for reaction.

[0048] Specifically, please refer to Figure 3, the first reflux channel 32 is a pump reflux channel, comprising a first reflux pipeline 321 and a centrifugal pump 322, the centrifugal pump 322 is connected with the first reflux pipeline 321, part of the effluent of the electro-catalytic zone 2 is refluxed to the adjustable water distributor 131 through the centrifugal pump 322 to mix with the newly incoming wastewater and be treated again; the first reflux pipeline 321 is further provided with an electromagnetic flowmeter 323. Please refer to Figure 5 , the second reflux channel 33 is a gas stripping channel, comprising a second reflux pipeline 331 and a gas supply device 332, the gas supply device 332 is connected with the second reflux pipeline 331, part of the effluent of the electro-catalytic zone 2 is refluxed to the water distribution channel 121 through the gas supply device 332 to mix with the newly incoming wastewater and be treated again. The gas supply device 332 includes but is not limited to a blower. The modular electro-catalytic hydrolysis acidification reaction device is provided with double reflux channels, on the one hand, part of the effluent of the electro-catalytic zone 2 is extracted to the adjustable water distributor 131 at the top of the central shaft 132 through the centrifugal pump 322 to form pump reflux and strengthen overall circulation mixing. On the other hand, a gas stripping channel is arranged near the electro-catalytic module 21 at the end of the electro-catalytic zone 2, air is injected through the gas supply device 332 to make part of the effluent of the electro-catalytic zone 2 reflux to the water distribution channel 121. Through the synergistic effect of the pump reflux and the gas stripping reflux, the adjustability of the reflux ratio and the impact resistance to load fluctuation can be increased, the gas stripping reflux can realize high proportion reflux with low energy consumption and adjust the ORP value in the system, and the pump reflux is used for realizing efficient stirring and pulse water distribution, the two are complementary to each other, and the system treatment efficiency is improved.

[0049] Further, the reflux ratio in the first reflux channel 32 is controlled to be (0.5-1):1, and the reflux ratio in the second reflux channel 33 is controlled to be (0.5-2):1, so that the ORP value in the hydrolysis acidification tank 11 is-400mV-0mV.

[0050] Still further, the modular electro-catalytic hydrolysis acidification reaction device further comprises an effluent system 6, the effluent system 6 is located at the upper part of the hydrolysis acidification tank 11; the effluent system 6 comprises an effluent tank 61 and an effluent tank 62, the effluent of the modular electro-catalytic hydrolysis acidification reaction device is collected into the effluent tank 62 through the effluent tank 61. Specifically, the setting height of the effluent tank 61 can be higher than the reflux pipe 31 and close to the liquid surface, corresponding to the clarification zone in the hydrolysis acidification tank 11, so as to facilitate the collection of clarified effluent.

[0051] The solar power supply system 4 is arranged above the hydrolysis acidification zone 1, can provide green energy for key operation components, and is electrically connected with the hydrolysis acidification zone 1, the electro-catalysis zone 2 and the intelligent control system 5. Specifically, the solar power supply system 4 can be electrically connected with the electro-catalysis module 21, the indicator light 22 and the intelligent control system 5, and supply power for the electro-catalysis reaction zone, the PLC control system, the indicator light 22 and other power-consuming equipment, so that the independent operation of the device is realized. Moreover, the design of the green power supply module reduces the operation cost, reduces the dependence on external power and carbon emission, avoids the influence of unstable external power supply on the system performance, and enables the modular electro-catalysis hydrolysis acidification reaction device to be independently operated in remote or non-electric areas.

[0052] Specifically, referring to Figure 6 The solar power supply system 4 includes a solar cell group 41, a storage battery group 42 and a controller 43, and can selectively supply power to required components. The storage battery group 42 can be used to store power at night or on cloudy days, so that the power supply system is designed to ensure continuous operation for 24 hours under cloudy and rainy conditions. If necessary, a direct current / alternating current inverter can also be configured according to requirements.

[0053] The present application comprehensively improves the treatment efficiency and operation stability of the hydrolysis acidification process through the innovative modular design and joint control strategy, and has the characteristics of easy maintenance and green energy saving, and is suitable for the enhanced pretreatment and comprehensive treatment of various wastewaters.

[0054] Correspondingly, the second aspect of the present application provides a wastewater treatment method, which uses the above-mentioned modular electro-catalysis hydrolysis acidification reaction device to treat wastewater, and the treatment method includes the following steps: (1) passing wastewater into the hydrolysis acidification zone 1 to perform hydrolysis acidification treatment on the wastewater; (2) passing the wastewater treated by the hydrolysis acidification zone 1 into the electro-catalysis zone 2 through the reflux pipe 31 to perform electro-catalysis treatment on the wastewater; (3) refluxing the effluent from the end of the electro-catalysis zone 2 to the hydrolysis acidification zone 1 through the reflux channel to adjust the residence time of the wastewater in the modular electro-catalysis hydrolysis acidification reaction device; (4) discharging the effluent treated by the modular electro-catalysis hydrolysis acidification reaction device.

[0055] Preferably, the residence time ratio of the wastewater in the hydrolysis acidification zone 1 and the electro-catalytic zone 2 is 1: (0.1-0.3). By controlling the residence time of the wastewater in the hydrolysis acidification zone 1 and the electro-catalytic zone 2, the nitrogen removal efficiency is improved, the energy consumption is reduced, and the treatment effect of the wastewater is improved. In some specific and preferred embodiments, the residence time of the wastewater in the hydrolysis acidification zone 1 is 8-24 h, and the residence time of the wastewater in the electro-catalytic zone 2 is 0.5-3 h. The residence time in each unit can be adjusted according to the quality of the raw water.

[0056] Further, the hydrolysis acidification zone 1 is connected with the intelligent control system 5, and the monitoring probe 52 in the hydrolysis acidification zone 1 includes an ORP monitor, a pH monitor, and a DO detector, so as to control the ORP value in the hydrolysis acidification tank 11 to be -400 mV-0 mV, the pH value to be 6.5-8, and the DO value to be less than or equal to 0.2 mg / L.

[0057] Further, part of the effluent after the electro-catalytic reaction is returned to the adjustable water distributor 131 through the first return pipe 31 for further treatment, and part of the effluent is returned to the water distribution channel 121 through the second return channel 33 for further treatment, and then mixed with the new incoming wastewater to adjust the residence time of the wastewater in the modular electro-catalytic hydrolysis acidification reaction device. In this process, the ratio of the return amount in the first return channel 32 to the water inflow is (0.5-1):1, and the ratio of the return amount in the second return channel 33 to the water inflow is (0.5-2):1, so that the ORP value in the hydrolysis acidification tank 11 is -400 mV-0 mV.

[0058] Preferably, in the electro-catalytic zone 2, the working voltage of the electrode assembly 211 is 0.3-2 V, and the current is 5-20 mA; the ORP value in the electro-catalytic zone 2 is -200 mV--50 mV, and the pH is 6.5-8.

[0059] Further, the micro-aerobic zone is connected with the intelligent control system 5, and the monitoring probe 52 in the intelligent control system 5 is a pH monitor, a DO detector, and an ORP monitor, so as to control the DO value in the micro-aerobic zone to be 0.2-0.5 mg / L, and the ORP value to be -100 mV-100 mV; the ORP value in the anoxic zone is -200 mV--50 mV.

[0060] In the application, the wastewater is treated by the modular electro-catalytic hydrolysis acidification reaction device according to the above treatment method, so that the removal rate of effluent COD of high-concentration wastewater reaches 30% to 50%, the removal rate of total nitrogen reaches 20% to 30%, the removal rate of effluent COD of medium-concentration wastewater reaches 15% to 30%, the removal rate of total nitrogen reaches 60% to 70%, and the modular electro-catalytic hydrolysis acidification reaction device can be stably operated, and has significant treatment effect and engineering application value.

[0061] The application is further described below by means of specific examples. Example 1 The example provides a wastewater treatment method, which comprises the following steps. (1) The test water is introduced into the hydrolysis acidification reaction tank through the water distribution pipe, the test water is kitchen waste slurry wastewater, and the water quality data of the influent are as follows: the COD is 6500 mg / L to 13000 mg / L, the total nitrogen is 2500 mg / L to 3600 mg / L, and the ammonia nitrogen is 2200 mg / L to 3300 mg / L; (2) The kitchen waste slurry wastewater is input into the hydrolysis acidification tank, the hydrolysis acidification tank is provided with a sludge expanded bed, the height of the sludge expanded bed is controlled at about 60%, the ORP value in the hydrolysis acidification tank is about-400 mV, the pH value is about 7, and the DO value is less than or equal to 0.2 mg / L, so as to degrade macromolecular organic matters in the wastewater; (3) The effluent of the hydrolysis acidification tank flows into the electro-catalytic area, the working voltage is 1 V, and the current is 12 mA; a plurality of electro-catalytic modules are arranged in the electro-catalytic area and electrically connected, each electro-catalytic module comprises an electrode assembly and an aeration device, the electro-catalytic module is divided into a micro-aerobic area and an anoxic area, the micro-aerobic area and the anoxic area are arranged alternately and continuously, the electrode assembly comprises a pair of electrode plates, the electrode plates become a pair of cathode plates and anode plates after being electrified, baffles are arranged between the electro-catalytic modules, the pH in the electro-catalytic area is about 7, and the ORP value in the anoxic area is about-50 mV; the DO value in the micro-aerobic area is about 0.35 mg / L, and the ORP value is about 100 mV, so as to promote the hydrolysis of high-molecular organic matters into easily degradable small-molecular organic matters; (4) The effluent at the end of the electro-catalytic area is returned to the hydrolysis acidification area through a return channel, so as to adjust the residence time of the wastewater in the modular electro-catalytic hydrolysis acidification reaction device, wherein the total residence time in the hydrolysis acidification tank is 18 h, and the total residence time in the electro-catalytic area is 2 h; The return channel comprises a first return channel and a second return channel, the first return channel is a pump return channel, and comprises a first return pipeline and a centrifugal pump, the centrifugal pump is connected with the first return pipeline, part of the effluent of the electro-catalytic area is returned to the adjustable water distributor through the centrifugal pump for reprocessing, and the return ratio of the first return channel is controlled at about (0.5-1):1. The second reflux channel is a gas stripping channel, comprising a second reflux pipeline and a gas supply device, the gas supply device being connected with the second reflux pipeline, part of the effluent of the electro-catalytic zone being refluxed to the water distribution channel by the gas supply device for reprocessing, the reflux ratio of the second reflux channel being controlled at about (0.5-2):1, and the refluxed water being mixed with the newly-incoming kitchen waste slurry wastewater to control the ORP value in the hydrolysis acidification tank at about -400 mV.

[0062] (5) discharging the effluent treated by the modular electro-catalytic hydrolysis acidification reaction device.

[0063] The test water and the effluent treated by the above treatment method are measured, and the results are shown in Table 1. Figures 7-10

[0064] Figure 7 Figure 1 is a diagram of the removal effect of COD before and after the treatment of kitchen waste slurry wastewater, in which, in the initial running period (8 / 19-8 / 25), the influent COD is about 6800 mg / L-7800 mg / L, the effluent COD is about 4700 mg / L-5500 mg / L, and the removal rate is between 25%-30%, showing the rapid establishment of the synergistic effect of hydrolysis acidification and electro-catalysis. In the middle running period (8 / 26-9 / 5), even if the influent COD is increased to 9000 mg / L-10500 mg / L, the effluent concentration slightly increases, but the removal rate is still stable at about 40%-50%, proving that the triple synergism of hydrolysis acidification, pulse water distribution and electro-catalytic micro-aerobic oxidation maintains a relatively stable treatment efficiency under high load conditions. In the final running period (9 / 6-9 / 29), the influent COD is increased again to 10000 mg / L-13000 mg / L, but the effluent COD is still controlled at 5500 mg / L-7000 mg / L, and the removal rate is more than 40% in most periods, fully verifying the adaptability and strengthening ability of electro-catalytic hydrolysis acidification to wastewater.

[0065] Figure 8 Figure 2 is a diagram of the removal effect of total nitrogen before and after the treatment of kitchen waste slurry wastewater, in which, the influent total nitrogen concentration fluctuates in the range of 2500 mg / L-3600 mg / L, and the effluent total nitrogen concentration is reduced to 1400 mg / L-2600 mg / L. Specifically, in the initial running period (7 / 6-7 / 10), the system has good denitrification effect and is still in the adaptation period; in the stable running period (7 / 11-8 / 2), the total nitrogen removal rate is maintained at 20%-30%, indicating that the denitrification function has entered a balance, and the significant support of micro-aerobic aeration to the nitrification-denitrification linkage and the denitrification community activity is fully embodied.

[0066] Figure 9 ​Figure of ammonia nitrogen removal effect of kitchen waste sludge wastewater before and after treatment. In the figure, the ammonia nitrogen influent fluctuates in the range of 2200 mg / L to 3300 mg / L, and the ammonia nitrogen accounts for a high proportion of total nitrogen, indicating that ammonia nitrogen is the main contributor of total nitrogen. In the early stage (7 / 6-7 / 19), the nitrification of the system is good, and the ammonia nitrogen removal rate is 30% to 40%; in the later stage (7 / 20-8 / 2), the ammonia nitrogen removal rate still remains at 20% to 30%.

[0067] Figure 10 Figure of microbial community in the modular electro-catalytic hydrolysis acidification reaction device. In the figure, from the community column chart, the microorganisms in the electro-catalytic hydrolysis acidification reactor are dominated by anaerobic bacteria (such as Anaerolineaceae ), fermentation and hydrolysis bacteria (such as Sedimentibacter , Proteiniphilum ) and obligate acid-producing bacteria (such as Fermentimonas ). These bacterial flora can maintain efficient hydrolysis and acidification functions. In addition, functional denitrifying bacteria (such as Thiopseudomonas ) can also be observed. During the operation, the relative abundance of the denitrification functional community slightly increases, indicating that electro-catalysis and micro-aerobic aeration provide a favorable microenvironment for ammonia nitrogen oxidation and nitrate reduction, while maintaining the stability of the core hydrolysis acidification community, realizing the simultaneous removal of carbon and nitrogen and the enrichment of functional bacterial flora.

[0068] The pilot test data prove that the modular electro-catalytic hydrolysis acidification reaction device described in the application has significant denitrification advantages and good engineering feasibility in treating high-concentration wastewater.

[0069] Example 2 The embodiment provides a wastewater treatment method, which is basically the same as that in Example 1, except that: The test water is mixed wastewater (including photovoltaic manufacturing wastewater) of an industrial park treated by a certain pilot project. The water quality characteristics are as follows: the COD is 250 mg / L to 400 mg / L, the total nitrogen (TN) is 40 mg / L to 60 mg / L, and the ammonia nitrogen accounts for about 10% to 20% of the TN.

[0070] Correspondingly, the ORP value in the hydrolysis acidification tank is-250 mV to 0 mV, and the ORP value in the electro-catalytic zone is-200 mV to 50 mV. The ORP value in the anoxic zone is about-200 mV to-50 mV; the DO value in the micro-aerobic zone is about 0.35 mg / L, and the ORP value is about-100 mV to 50 mV.

[0071] The test water and the effluent after being treated by the above treatment method are determined, and the structure is as shown in Figures 11-12 .

[0072] Figure 11COD removal effect diagram of mixed wastewater (including photovoltaic manufacturing wastewater) in industrial park before and after treatment. As can be seen from the figure, the COD removal rate is 15%~30%.

[0073] Figure 12 TN removal effect diagram of mixed wastewater (including photovoltaic manufacturing wastewater) in industrial park before and after treatment. As can be seen from the figure, the TN removal rate can reach 60%~70% during the stable operation period.

[0074] The system has low ammonia nitrogen concentration in the influent, and the denitrification effect is mainly reflected in the removal of nitrite, nitrate and organic nitrogen. The aerobic / anaerobic microenvironment produced by the alternation of electrocatalysis and micro-oxygen and the increased supply of volatile fatty acids (VFA) provide favorable conditions for nitrification-denitrification coupling, thereby realizing efficient total nitrogen conversion and removal.

[0075] The pilot test data prove that the modular electrocatalytic hydrolysis acidification reaction device has significant denitrification advantage and good engineering feasibility when treating medium-concentration industrial wastewater.

[0076] The above only discloses one preferred embodiment of the present application, and of course cannot limit the scope of the rights of the present application, so the equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A modular electrocatalytic hydrolysis acidification reaction device, characterized in that, The modular electro-catalytic hydrolysis acidification reaction device is used for treating wastewater, and comprises a hydrolysis acidification zone, an electro-catalytic zone, a reflux system and a solar power supply system, wherein the effluent of the hydrolysis acidification zone flows into the electro-catalytic zone through a reflux pipe, and the terminal effluent of the electro-catalytic zone flows into the hydrolysis acidification zone through a reflux channel, and the electro-catalytic zone is arranged in a back-to-back shape above the hydrolysis acidification zone. The hydrolysis acidification zone comprises a hydrolysis acidification tank, and the hydrolysis acidification tank is provided with hydrolysis acidification sludge. The electro-catalytic zone comprises a plurality of electrically connected electro-catalytic modules, each of which comprises an electrode assembly and an aeration device, and the electro-catalytic modules are divided into micro-aerobic zones and anoxic zones, and the micro-aerobic zones and the anoxic zones are arranged alternately and continuously. The wastewater enters the hydrolysis acidification zone and is subjected to organic matter chain breaking and ring breaking and biological detoxification treatment, the effluent of the hydrolysis acidification zone flows into the electro-catalytic zone and is subjected to nitrification-denitrification synergistic denitrification treatment, and the terminal effluent of the electro-catalytic zone flows into the hydrolysis acidification zone to adjust the residence time of the wastewater in the modular electro-catalytic hydrolysis acidification reaction device.

2. The modular electro-catalytic hydrolysis acidification reaction device according to claim 1, wherein, The hydrolysis acidification tank comprises: a hydrolysis acidification tank body, wherein the hydrolysis acidification sludge is arranged at the bottom of the hydrolysis acidification tank body; a water inlet system, which comprises a water distribution channel for uniform water inlet and a water distribution pipe connected with the water distribution channel; a water distribution system, which comprises an adjustable water distributor, a central shaft and a water distribution system, the central shaft is located in the hydrolysis acidification tank body, the water distribution pipe is connected with the inner cavity of the central shaft to enable the wastewater to enter the inside of the central shaft from the water distribution channel through the water distribution pipe; the top of the central shaft is connected with the adjustable water distributor, and the bottom of the central shaft is connected with the water distribution system, so that the wastewater in the central shaft enters the inside of the hydrolysis acidification tank through the water distribution system; the terminal effluent of the electro-catalytic zone flows into the water distribution system of the hydrolysis acidification zone through the reflux channel.

3. The modular electro-catalytic hydrolysis acidification reaction device of claim 2, wherein, The reflux channel comprises a first reflux channel and a second reflux channel; the first reflux channel is a pump reflux channel, which comprises a first reflux pipeline and a centrifugal pump, the centrifugal pump is connected with the first reflux pipeline, part of the effluent of the electro-catalytic zone is refluxed to the adjustable water distributor through the centrifugal pump to be mixed with the newly-inlet wastewater and subjected to re-treatment, and an electromagnetic flowmeter is further arranged on the first reflux pipeline; the second reflux channel is a gas stripping channel, which comprises a second reflux pipeline and a gas supply device, the gas supply device is connected with the second reflux pipeline, part of the effluent of the electro-catalytic zone is refluxed to the water distribution channel through the gas supply device to be mixed with the newly-inlet wastewater and subjected to re-treatment.

4. The modular electro-catalytic hydrolysis acidification reaction device of claim 1, wherein, Baffles are arranged between the electro-catalytic modules, the baffles are alternately and separately arranged in the horizontal direction or in the vertical direction; each electro-catalytic module further comprises an indicator lamp, and the indicator lamp is electrically connected with the electrode assembly; the aeration device comprises an aeration disc, an aeration hose and a blowing device, and the aeration disc and the blowing device are connected through the aeration hose. The electrode assembly comprises a pair of electrode plates, which are composed of a bracket and an electrocatalytic filler fixed on the bracket, wherein the electrocatalytic filler is a carbon fiber electrocatalytic filler.

5. The modular electro-catalytic hydrolysis acidification reaction device of claim 2, wherein, The hydrolysis acidification tank further comprises a sludge discharge system arranged at the bottom of the hydrolysis acidification tank body for discharging sludge in the hydrolysis acidification tank body.

6. The modular electro-catalytic hydrolysis acidification reaction device of claim 1, wherein, The modular electrocatalytic hydrolysis acidification reaction device further comprises a water outlet system located at the upper part of the hydrolysis acidification tank. The water outlet system comprises a water outlet groove and a water outlet tank, and the water outlet of the modular electrocatalytic hydrolysis acidification reaction device is collected in the water outlet tank through the water outlet groove.

7. The modular electro-catalytic hydrolysis acidification reaction device of claim 1, wherein, The solar power supply system is arranged above the hydrolysis acidification zone. The solar power supply system comprises a solar cell group, a battery group and a controller. The solar power supply system is electrically connected with the hydrolysis acidification zone and the electrocatalytic zone.

8. The modular electro-catalytic hydrolysis acidification reaction device of claim 1, wherein, The modular electrocatalytic hydrolysis acidification reaction device further comprises an intelligent control system connected with the hydrolysis acidification zone, the electrocatalytic zone and the solar power supply system. The intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, and the monitoring probe comprises a DO monitor, an ORP monitor, a pH monitor, a flow monitor and a conductivity monitor.

9. A method of treating wastewater, characterized by, The modular electrocatalytic hydrolysis acidification reaction device is used for treating wastewater, and the treatment method comprises the following steps: (1) passing wastewater into the hydrolysis acidification zone to perform hydrolysis acidification treatment on the wastewater; (2) passing the wastewater treated by the hydrolysis acidification zone into the electrocatalytic zone through a reflux pipe to perform electrocatalytic treatment on the wastewater; (3) refluxing the effluent at the end of the electrocatalytic zone to the hydrolysis acidification zone through a reflux channel to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reaction device; (4) discharging the effluent treated by the modular electrocatalytic hydrolysis acidification reaction device.

10. The method of treating wastewater according to claim 9, wherein, In the electrocatalytic zone, the working voltage of the electrode assembly is 0.3V-2V, and the current is 5mA-20mA. The electrocatalytic zone is connected with an intelligent control system, the intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, and the monitoring probe comprises a pH monitor, a DO monitor and an ORP monitor to control the ORP value in the electrocatalytic zone to be-200mV-100mV, the pH value to be 6.5-8, the DO value in the micro-aerobic zone to be 0.2mg / L-0.5mg / L, the ORP value in the micro-aerobic zone to be-100mV-100mV, and the ORP value in the anoxic zone to be-200mV--50mV. The hydrolysis acidification zone is connected with an intelligent control system, the intelligent control system comprises a monitoring station and a monitoring probe electrically connected with the monitoring station, and the monitoring probe comprises an ORP monitor, a pH monitor and a DO monitor to control the ORP value in the hydrolysis acidification tank to be-400mV-0mV, the pH value to be 6.5-8, and the DO value to be less than or equal to 0.2mg / L. The residence time ratio of the wastewater in the hydrolytic acidification zone and the electro-catalysis zone is 1: (0.1-0.3). The residence time ratio of the wastewater in the hydrolytic acidification zone and the electro-catalysis zone is 1: (0.1-0.3).

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