A modular electro-catalytic hydrolysis acidification reaction device and a wastewater treatment method

Abstract

The present application relates to the technical field of wastewater treatment, and discloses a modular electro-catalytic hydrolysis acidification reaction device and a wastewater treatment method.The modular electro-catalytic hydrolysis acidification reaction device comprises a hydrolysis acidification zone, an electro-catalytic zone, a reflux system and a solar power supply system, the reflux system comprises a reflux pipe and a reflux channel, effluent from the hydrolysis acidification zone flows into the electro-catalytic zone through the reflux pipe, and effluent from the end of the electro-catalytic zone flows into the hydrolysis acidification zone through the reflux channel, wherein the electro-catalytic zone comprises a plurality of electro-catalytic modules connected in an electric manner, the electro-catalytic module comprises an electrode assembly and an aeration device, the electro-catalytic module is divided into a micro-aerobic zone and an anoxic zone, and the micro-aerobic zone and the anoxic zone are arranged alternately and continuously. The reaction device is used for treating wastewater, can realize the function of efficient denitrification through simultaneous nitrification and denitrification, and can improve the organic matter removal efficiency in the hydrolysis acidification stage and enhance the biodegradability of sewage.

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 it through the anode oxidation reaction (directly or indirectly mineralizing or converting the refractory organic matter into easy-biodegradable products) and cathode reduction reaction (generating hydrogen, peroxide, or realizing the reduction and dehalogenation of specific organic functional groups) 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.

[0009] The hydrolysis acidification zone includes a hydrolysis acidification tank, and the hydrolysis acidification tank is provided with hydrolysis acidification sludge;

[0010] 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.

[0011] 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.

[0012] As an improvement to the above scheme, the hydrolysis acidification tank includes:

[0013] A hydrolysis acidification tank, wherein the hydrolysis acidification sludge is disposed at the bottom of the hydrolysis acidification tank;

[0014] A water inlet system, the water inlet system including a water distribution channel for uniform water inlet, and a water distribution pipe connected to the water distribution channel;

[0015] A water distribution system, comprising an adjustable water distributor, a central shaft, and a water distribution system, wherein the central shaft is located within the hydrolysis acidification tank, and the water distribution pipe is connected to the inner cavity of the central shaft, so that wastewater enters the interior of the central shaft from the water distribution channel through the water distribution pipe;

[0016] The top of the central shaft is connected to the adjustable water distributor, and the bottom of the central shaft is connected to the water distribution system, so that the wastewater in the central shaft enters the hydrolysis acidification tank through the water distribution system.

[0017] The effluent from the end of the electrocatalytic zone flows into the water distribution system of the hydrolysis acidification zone through a reflux channel.

[0018] As an improvement to the above scheme, the reflux channel includes a first reflux channel and a second reflux channel, and the effluent from the hydrolysis acidification zone enters the electrocatalytic zone through the reflux pipe;

[0019] The first return channel is a pump return channel, including a first return pipe and a centrifugal pump. The centrifugal pump is connected to the first return pipe. Part of the effluent from the electrocatalytic zone is returned to the adjustable water distributor through the centrifugal pump to mix with the newly introduced wastewater and undergo further treatment. An electromagnetic flow meter is also installed on the first return pipe.

[0020] The second return channel is an air-lift channel, which includes a second return pipe and an air supply device. The air supply device is connected to the second return pipe. Part of the effluent from the electrocatalytic zone is returned to the water distribution channel through the air supply device to mix with the newly introduced wastewater and undergo further treatment.

[0021] As an improvement to the above solution, baffles are provided between the electrocatalytic modules; the baffles are alternately spaced in the horizontal direction or alternately spaced in the vertical direction.

[0022] Each of the electrocatalytic modules also includes an indicator light, which is electrically connected to the electrode assembly;

[0023] The aeration device includes an aeration disc, an aeration hose, and a blower, wherein the aeration disc and the blower are connected via the aeration hose.

[0024] The electrode assembly includes a pair of electrode plates, each electrode plate consisting of a support and an electrocatalytic filler fixed to the support, wherein the electrocatalytic filler is a carbon fiber electrocatalytic filler.

[0025] As an improvement to the above solution, the hydrolysis acidification tank further includes a sludge discharge system, which is located at the bottom of the hydrolysis acidification tank and is used to discharge the hydrolysis acidification sludge from the hydrolysis acidification tank.

[0026] As an improvement to the above scheme, the modular electrocatalytic hydrolysis acidification reaction device further includes an outlet water system, which is located above the hydrolysis acidification tank;

[0027] The water outlet system includes an outlet tank and an outlet pool. The water outlet from the modular electrocatalytic hydrolysis acidification reaction device is collected in the outlet tank and flows into the outlet pool.

[0028] As an improvement to the above solution, the solar power supply system is positioned above the hydrolysis acidification zone;

[0029] The solar power supply system includes solar cell arrays, battery arrays, and a controller;

[0030] The solar power supply system is electrically connected to the hydrolysis acidification zone and the electrocatalytic zone.

[0031] As an improvement to the above scheme, the modular electrocatalytic hydrolysis acidification reaction device also includes an intelligent control system, which is connected to the hydrolysis acidification zone, the electrocatalytic zone and the solar power supply system.

[0032] The intelligent control system includes a monitoring station and monitoring probes electrically connected to the monitoring station; the monitoring probes include a DO monitor, an ORP monitor, a pH monitor, a flow monitor, and a conductivity monitor.

[0033] A second aspect of the present invention also provides a wastewater treatment method, which uses the aforementioned modular electrocatalytic hydrolysis acidification reaction device to treat the wastewater, the treatment method comprising the following steps:

[0034] (1) The wastewater is fed into the hydrolysis acidification zone for hydrolysis acidification treatment;

[0035] (2) The wastewater after being treated in the hydrolysis and acidification zone flows into the electrocatalytic zone through the return pipe for electrocatalytic treatment;

[0036] (3) The end effluent of the electrocatalytic zone is returned to the hydrolysis acidification zone through the reflux channel to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor;

[0037] (4) Discharge the effluent after it has been treated by the modular electrocatalytic hydrolysis acidification reaction device.

[0038] As an improvement to the above scheme, in the electrocatalytic region, the operating voltage of the electrode assembly is 0.3V~2V, and the current is 5mA~20mA;

[0039] The electrocatalytic zone is connected to an intelligent control system, which includes a monitoring station and monitoring probes electrically connected to the monitoring station. The monitoring probes in the intelligent control system include a pH monitor, a DO monitor, and an ORP monitor to control the ORP value in the electrocatalytic zone to be -200mV to 100mV and the pH value to be 6.5 to 8. Specifically, the DO value in the microaerobic zone is 0.2mg / L to 0.5mg / L, the ORP value in the microaerobic zone is -100mV to 100mV, and the ORP value in the anoxic zone is -200mV to -50mV.

[0040] The hydrolysis acidification zone is connected to the intelligent control system, which includes a monitoring station and monitoring probes electrically connected to the monitoring station. The monitoring probes in the hydrolysis acidification zone include an ORP monitor and a DO detector to control the ORP value in the hydrolysis acidification tank to be -400mV to 0mV, the pH value to be 6.5 to 8, and the DO value to be less than or equal to 0.2mg / L.

[0041] The residence time ratio of the wastewater in the hydrolysis acidification zone to the electrocatalytic zone is 1:(0.1~0.3).

[0042] Implementing this invention has the following beneficial effects:

[0043] (1) The modular electrocatalytic hydrolysis acidification reactor utilizes the synergistic effect of the hydrolysis acidification zone and the electrocatalytic zone to achieve nitrification and denitrification, thereby improving the organic matter removal efficiency in the hydrolysis acidification stage, enhancing the biodegradability of wastewater, and improving the adaptability and enhancement capacity of wastewater. At the same time, the electrocatalytic zone is arranged in a U-shape above the hydrolysis acidification zone, forming a single-tank structure with a compact structure, constituting a separate cycle for hydrolysis acidification treatment and electrocatalytic treatment, integrating multiple treatment functions in one unit, and saving the footprint of the device.

[0044] (2) The modular design of the electrocatalytic zone provides strong operational flexibility. Each module can be started and stopped independently, and the number of electrocatalytic modules can be increased or decreased according to the treatment capacity requirements. This allows for flexible adaptation to changes in water quality and has a wide range of applications and promotional value. Furthermore, by combining the aeration device with the modular design, single or multiple electrocatalytic modules can be combined into an electrocatalytic module group. Through zone control valves and aeration control, the different electrocatalytic modules in the same electrocatalytic zone can operate alternately in anoxic / micro-aerobic conditions, thereby improving the efficiency of nitrification-denitrification synergistic nitrogen removal and enhancing the biochemical stability within the reaction device.

[0045] (3) Using dual return channels in the return system can effectively reduce energy consumption and optimize ORP regulation, increase the adjustability of the return ratio and the resistance to load fluctuations.

[0046] (4) The detachable electrocatalytic module and indicator lights enable rapid location of circuit faults in a single set of electrode components or a single pair of electrode plates. When the wires in the electrode components are broken or the power supply is abnormal, the indicator lights will prompt maintenance personnel to check, which facilitates maintenance and replacement and simplifies operation and maintenance.

[0047] (5) Adopting new energy supply methods and matching solar power supply modules can reduce carbon emissions and energy consumption and improve the overall operating efficiency of the system. Attached Figure Description

[0048] Figure 1 : A top view of the modular electrocatalytic hydrolysis acidification reaction apparatus of this invention;

[0049] Figure 2 : A cross-sectional view of the modular electrocatalytic hydrolysis acidification reaction device in this invention from one direction;

[0050] Figure 3 : A cross-sectional view of the modular electrocatalytic hydrolysis acidification reaction device in this invention from another direction;

[0051] Figure 4 This is a schematic diagram of the structure in which baffles are arranged in different directions between the electrocatalytic modules in this invention.

[0052] Figure 5 : A schematic diagram of the structure of the second return channel in this invention;

[0053] Figure 6 : A schematic diagram of the solar power supply system in this invention.

[0054] Figure 7 : COD removal effect before and after treatment of kitchen waste biogas slurry wastewater;

[0055] Figure 8 : Total nitrogen removal effect before and after treatment of kitchen waste biogas slurry wastewater;

[0056] Figure 9 Ammonia nitrogen removal effect before and after treatment of kitchen waste biogas slurry wastewater;

[0057] Figure 10 Microbial community diagram in a modular electrocatalytic hydrolysis acidification reactor;

[0058] Figure 11 : COD removal effect diagram before and after treatment of mixed wastewater (including photovoltaic manufacturing wastewater, etc.) in industrial parks;

[0059] Figure 12 : Total nitrogen removal effect diagram before and after treatment of mixed wastewater (including photovoltaic manufacturing wastewater, etc.) in industrial parks.

[0060] Figure label:

[0061] 1-Hydrolysis acidification zone; 11-Hydrolysis acidification tank; 12-Inlet system; 121-Distribution channel; 122-Distribution pipe; 13-Water distribution system; 131-Adjustable distributor; 132-Central shaft; 133-Distribution system; 14-Sludge removal system; 2-Electrocatalysis zone; 21-Electrocatalysis module; 211-Electrode assembly; 2111-Electrode plate; 212-Aeration device; 213-Blower; 22-Indicator light; 23-Baffle plate; 3-Recirculation system 31-Return pipe; 32-First return channel; 321-First return pipeline; 322-Centrifugal pump; 323-Electromagnetic flow meter; 33-Second return channel; 331-Second return pipeline; 332-Gas supply equipment; 4-Solar power supply system; 41-Solar cell array; 42-Battery array; 43-Controller; 5-Intelligent control system; 51-Monitoring station; 52-Monitoring probe; 6-Water outlet system; 61-Water outlet tank; 62-Water outlet pool. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described in further detail below.

[0063] To address the above problems, this invention provides a modular electrocatalytic hydrolysis acidification reaction apparatus. Please refer to [link / reference]. Figures 1-3The modular electrocatalytic hydrolysis acidification reactor is used to treat wastewater and includes: a hydrolysis acidification zone 1, an electrocatalytic zone 2, a reflux system 3, and a solar power supply system 4. The reflux system 3 includes a reflux pipe 31 and a reflux channel. The effluent from the hydrolysis acidification zone 1 flows into the electrocatalytic zone 2 through the reflux pipe 31, and the end effluent from the electrocatalytic zone 2 flows into the hydrolysis acidification zone 1 through the reflux channel. The electrocatalytic zone 2 is arranged in a U-shape above the hydrolysis acidification zone 1. The wastewater enters the hydrolysis acidification zone 1 and undergoes organic matter chain breaking and biological detoxification treatment. The effluent from the hydrolysis acidification zone 1 flows into the electrocatalytic zone 2 and undergoes nitrification-denitrification synergistic denitrification treatment. The end effluent from the electrocatalytic zone 2 flows into the hydrolysis acidification zone 1 to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor. It should be noted that the wastewater in this application can be municipal wastewater or industrial park wastewater, or a mixture of municipal wastewater and industrial park wastewater.

[0064] In this invention, the modular electrocatalytic hydrolysis acidification reactor utilizes the hydrolysis acidification zone 1 and the electrocatalytic zone 2 in synergistic action to achieve nitrification and denitrification in wastewater treatment, thereby improving the hydrolysis acidification efficiency and its adaptability and enhancement capabilities to wastewater. Simultaneously, the electrocatalytic zone 2 is arranged in a U-shape above the hydrolysis acidification zone 1, and through the reflux system 3, it forms a separate cycle for hydrolysis acidification and electrocatalytic treatment, integrating multiple treatment functions and saving space.

[0065] Preferably, the modular electrocatalytic hydrolysis acidification reaction device further includes an intelligent control system 5, which is connected to the hydrolysis acidification zone 1, the electrocatalytic zone 2, and the solar power supply system 4. Specifically, the intelligent control system 5 can be a PLC intelligent control system.

[0066] Furthermore, the intelligent control system 5 includes a monitoring station 51 and monitoring probes 52 electrically connected to the monitoring station 51; the monitoring probes 52 include, but are not limited to, DO monitors, ORP monitors, pH monitors, flow monitors, and conductivity monitors. By real-time monitoring of data such as pH, oxidation-reduction potential (ORP), dissolved oxygen (DO) concentration, and conductivity in the reaction system of each unit, node data is uploaded to the PLC at a frequency of 1 minute / time and refreshed to the monitoring station 51 in real time, achieving full-process monitoring. The reaction system can be adjusted in a timely manner to meet the required reaction conditions in each unit, control the reaction progress, and improve the degradation efficiency of wastewater.

[0067] The hydrolysis acidification zone 1 includes a hydrolysis acidification tank 11, which contains hydrolysis acidification sludge (not shown in the figure). Microorganisms decompose large organic molecules in the wastewater into smaller molecules through hydrolysis acidification. The hydrolysis acidification sludge is anaerobic sludge primarily for hydrolysis acidification, and also contains denitrification sludge utilizing different electron donors and acceptors (such as different valence states of sulfur). In other words, the hydrolysis acidification sludge mainly contains some bacteria that consume / decompose organic matter, such as anaerobic bacteria, fermentative hydrolytic bacteria, and obligate acid-producing bacteria, as well as some denitrifying bacteria. In some embodiments, the abundance of organic matter decomposing bacteria in the hydrolysis acidification sludge can exceed 60%, and the abundance of denitrifying bacteria is around 1% to 2%. The hydrolysis acidification sludge can be flocculent or granular. Specifically, a hydrolysis acidification sludge expanded bed can be set at the bottom of the hydrolysis acidification tank 11, with the height of the expanded bed being 45% to 75% of the height of the hydrolysis acidification tank 11.

[0068] It should be noted that the hydrolysis and acidification reaction of the hydrolysis and acidification sludge in the hydrolysis and acidification zone 1 requires the use of pH, ORP, and other control measures. Therefore, the hydrolysis and acidification tank 11 is also connected to the intelligent control system 5. The intelligent control system 5 includes a monitoring station 51 and a monitoring probe 52 electrically connected to the monitoring station 51. The monitoring probe 52 includes an ORP monitor, a pH monitor, and a DO detector to control the ORP value in the hydrolysis and acidification tank 11 to -400mV to 0mV, the pH value to 6.5 to 8, and the DO value to less than or equal to 0.2mg / L. This creates a favorable environment for the hydrolysis and acidification process, allowing functional microorganisms to decompose recalcitrant organic matter under suitable conditions, promoting the reduction and detoxification of recalcitrant organic matter, improving decomposition efficiency, blocking the aerobic metabolic pathways of facultative bacteria, inhibiting the activity of aerobic bacteria, ensuring the integrity of the hydrolysis and acidification products, and providing sufficient substrate for subsequent electrocatalytic reactions.

[0069] Further, the hydrolysis acidification tank 11 includes: a hydrolysis acidification tank body (not shown in the figure), wherein the hydrolysis acidification sludge is disposed at the bottom of the hydrolysis acidification tank body; an inlet system 12, the inlet system 12 including a water distribution channel 121 for uniform water intake, and a water distribution pipe 122 connected to the water distribution channel 121; and a water distribution system 13, the water distribution system 13 including an adjustable water distributor 131, a central shaft 132, and a water distribution system 133, wherein the central shaft... 132 is located inside the hydrolysis acidification tank. The water distribution pipe 122 is connected to the inner cavity of the central shaft 132 so that wastewater enters the central shaft 132 from the water distribution channel 121 through the water distribution pipe 122. The top of the central shaft 132 is connected to the adjustable water distributor 131, and the bottom of the central shaft 132 is connected to the water distribution system 133 so that wastewater in the central shaft 132 enters the hydrolysis acidification tank 11 through the water distribution system.

[0070] Specifically, the effluent from the end of the electrocatalytic zone 2 flows into the water distribution system 133 of the hydrolysis acidification zone 1 through the return channel. The inlet of the water distribution pipe 122 is connected to the water distribution channel 121, and the outlet is connected to the inner cavity of the central shaft 132. This allows wastewater to enter 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, which fully suspends the bottom expanded sludge particles, forming a sludge expansion bed and improving the contact efficiency between organic matter and sludge. Under the action of the water distribution system 133, the wastewater transported from the central shaft 132 flows from bottom to top through the hydrolysis acidification sludge layer, promoting sludge mixing and forming a stable sludge expansion bed.

[0071] In some embodiments, the hydrolysis acidification tank can specifically be a concrete tank with a depth of approximately 7m to 12.5m. The area can be designed according to the treatment volume, and a clarification zone is designed 2m to 4m above the liquid surface in the middle of the tank. The lower part is a sludge expansion bed zone, and the height of the sludge expansion bed can be 50%-75% of the tank depth. The water distribution system 133 includes a water distribution pipe (not shown in the figure) connected to the inner cavity of the central vertical shaft 132 and a vortex water distributor (not shown in the figure). The vortex water distributors can be evenly spaced 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 is 2.5m². 2 ~4.0m 2 The central vertical shaft 132 in the pool distributes water in a pulse every 2 to 5 minutes. The diameter of the adjustable water distributor 131 can be 1.1m to 1.3m.

[0072] Furthermore, the hydrolysis acidification tank 11 also includes a sludge discharge system 14, which is located at the bottom of the hydrolysis acidification tank and is used to discharge the sludge within the tank. By periodically activating the sludge discharge system 14, the deposited sludge at the bottom of the hydrolysis acidification tank 11 is extracted, ensuring efficient degradation of wastewater by microorganisms in the bottom sludge and timely discharge of acidification products, thus avoiding the consumption of ineffective carbon sources. Specifically, the system biomass level 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 volatilized by incineration at 600℃.

[0073] The electrocatalytic zone 2 includes multiple electrically connected electrocatalytic modules 21. Each electrocatalytic module 21 includes an electrode assembly 211 and an aeration device 212. The electrocatalytic module 21 is divided into a micro-aerobic zone and an anoxic zone, which are alternately and continuously arranged. It is understood that when the aeration device 212 is working, a micro-aerobic zone is formed; when the aeration device 212 is not working, an anoxic zone is formed. The multiple electrocatalytic modules 21 in the electrocatalytic zone 2 can be arranged in series. The arrangement of the electrode assembly 211 can enhance the hydrolysis acidification efficiency.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] The aeration device 212 includes an aeration disc (not shown in the figure), an aeration hose (not shown in the figure), and a blower 213. The aeration disc and the blower 213 are connected via the aeration hose. Multiple aeration discs can be provided in each electrocatalytic module 21. Through the action of the aeration hose and the blower 213, oxygen transfer and oxygen utilization are improved, enhancing the uniform distribution of dissolved oxygen in a single electrocatalytic module 21. Furthermore, the micro-aerobic zone and anoxic zone can be flexibly adjusted according to actual conditions. The aeration discs include, but are not limited to, plate-type microporous aeration discs, and the number of aeration discs can be specifically set according to actual conditions. In some embodiments, each electrocatalytic module 21 is provided with 4 to 10 aeration discs.

[0078] Furthermore, each electrocatalytic module 21 also includes an indicator light 22, which is electrically connected to the electrode assembly 211 and is used to indicate whether the electrode assembly 211 has malfunctioned. This indicator light 22 can function as an online fault diagnosis system and, together with the electrode assembly 211 and the aeration device 212, forms a single electrocatalytic module 21. The detachable electrocatalytic module 21 and indicator light 22 configuration allows for rapid location of circuit faults in a single set of electrode assemblies 211 or a single pair of electrode plates 2111. When a wire in the electrode assembly 211 experiences an open circuit or power abnormality, the indicator light 22 alerts maintenance personnel to check, facilitating maintenance and replacement and simplifying operation and maintenance. In a single electrocatalytic module 21, the number of indicator lights 22 can be one or more. In some embodiments, the number of indicator lights 22 in a single electrocatalytic module 21 is one, specifically installed on a set of electrode assemblies 211. In some embodiments, the number of indicator lights 22 in a single electrocatalytic module 21 is multiple, specifically installed on each pair of electrode plates 2111.

[0079] Furthermore, please refer to Figure 4 The electrocatalytic modules 21 are connected by baffles 23, which hydraulically isolate the wastewater, ensuring that wastewater flowing from one electrocatalytic module group must be deflected before entering the next, thus guaranteeing hydraulic isolation and sequential flow through the alternating microaerobic and anoxic zones. The baffles 23 are alternately arranged horizontally or vertically to force the water flow to turbulently enter the next electrocatalytic module group. In some embodiments, the baffles 23 can correspond to the anoxic and microaerobic zones. Taking the formation of an electrocatalytic module group by three electrocatalytic modules 21 as an example, the first, second, and third electrocatalytic modules 21 form electrocatalytic module group 1; the fourth, fifth, and sixth electrocatalytic modules 21 form electrocatalytic module group 2; and the seventh, eighth, and ninth electrocatalytic modules 21 form electrocatalytic module group 3. When electrocatalytic module group 1 is aerated, it is a microaerobic zone, while electrocatalytic module group 2 and electrocatalytic module group 3 are microaerobic zones. When electrocatalytic module group 1 is not aerated, it is an anoxic zone, while electrocatalytic module group 2 and electrocatalytic module group 3 are microaerobic zones, thus forming multiple alternating A / O regions. The baffles 23 can be correspondingly set between electrocatalytic module group 1 and electrocatalytic module group 2, and between electrocatalytic module group 2 and electrocatalytic module group 3.

[0080] It should be noted that the electrocatalytic reaction in the electrocatalytic zone 2 requires the use of control measures such as pH, ORP, DO, and conductivity. Therefore, the electrocatalytic zone 2 is also connected to the intelligent control system 5. Specifically, the intelligent control system 5 includes a monitoring station 51 and a monitoring probe 52 electrically connected to the monitoring station 51. The monitoring probe 52 includes a pH monitor, an ORP monitor, and a DO detector to control the ORP value in the electrocatalytic zone 2 to be -200mV to 100mV and the pH value to be 6.5 to 8. Specifically, it controls the DO value in the micro-aerobic zone to be 0.2mg / L to 0.5mg / L and the ORP value to be -100mV to 100mV, and the ORP value in the anoxic zone to be -200mV to -50mV. Furthermore, it automatically switches the aeration valves of each electrocatalytic module 21 according to the ORP set value in the micro-aerobic zone to provide a micro-oxygen environment for the hydrolysis acidification reaction and realize a dynamic A / O alternating operation strategy. This strategy is beneficial for the sequential nitrification and denitrification reactions in different electrocatalytic modules 21, thereby improving the total nitrogen removal efficiency. Furthermore, the intelligent control system 5 can switch the aeration state in the A / O zone according to a set cycle to prevent sludge from depositing in the anoxic zone, and use aeration bubbles to periodically clean the electrocatalytic packing material, maintaining the activity of microorganisms on the surface of the electrocatalytic packing material and ensuring unobstructed conductive channels. During this process, the monitoring probe 52 includes a conductivity meter. In the electrocatalytic reaction, the current is affected by the conductivity of the water. If the water conductivity is too high, the voltage and current can be appropriately reduced to prevent excessive discharge of the packing material. Therefore, conductivity monitoring is mainly to ensure that the current and voltage of the electrocatalysis are within a suitable range. However, the conductivity varies depending on the wastewater quality, and this application does not limit its range.

[0081] Furthermore, the monitoring probe 52 also includes an electrode current / voltage detection module to control the electrode power supply. Taking the installation of one indicator light 22 on each pair of electrode plates 2111 as an example, a sampling resistor is connected in series between the negative terminal and the negative terminal of the power supply. The voltage across the sampling resistor is converted into a 0V~5V analog signal by a differential amplifier and sent to the PLC analog input. The PLC is set with discrimination logic for open circuit (voltage≈0), short circuit (voltage>threshold), and current efficiency decay (>±10% drift). Once any condition is triggered, the PLC outputs a digital signal to the control terminal of the fault indicator light 22. The indicator light 22 specifically adopts a three-color LED module, which integrates green, red, and blue chips. A solid green light indicates that all electrode components 211 are normally powered; a solid red light indicates that an open circuit has been detected; a flashing red light indicates that a short circuit or a sudden drop in current efficiency has been detected; and a flashing blue light indicates that the sampling resistor or sensor reading is abnormal. The intelligent control system 5 has a built-in AI algorithm model that predicts electrode contamination or blockage risks based on historical DO, ORP, current, and voltage values. It automatically adjusts the potential of each module or issues maintenance reminders when necessary. Of course, the intelligent control system 5 can also be equipped with a human-machine interface or remote monitoring functions to adjust operating parameters or issue real-time alarms.

[0082] The reaction zone of the electrocatalytic zone 2 described in this application is divided into modules. Each module is equipped with an independent circuit and a fault indicator light 22. With the assistance of the intelligent control system 5, real-time monitoring and fault visualization are realized. In case of short circuit or open circuit, the faulty module can be quickly diagnosed and replaced individually, reducing maintenance downtime and simplifying operation and maintenance.

[0083] The reflux system 3 includes a reflux pipe 31 and reflux channels, with the reflux channels including a first reflux channel 32 and a second reflux channel 33. The reflux pipe 31 is positioned above the hydrolysis acidification tank 11. In the hydrolysis acidification tank 11, wastewater passes through the sludge expansion bed and reaches a relatively clear area in the upper middle part. The reflux pipe 31 located here collects the effluent from the hydrolysis acidification tank 11 and enters the electrocatalytic zone 2. For example, the reflux pipe 31 can be installed at a position 2.5m to 4.5m above the water surface (approximately 0.5m below the clearing zone) in the hydrolysis acidification tank. After entering the hydrolysis acidification zone 1, the wastewater rises from the bottom, contacts the sludge expansion bed, and reacts. This facilitates collection through the reflux pipe 31 and allows the wastewater to flow from the inlet of the electrocatalytic unit into the reaction zone of the first electrocatalytic module 21 for reaction.

[0084] Specifically, please refer to Figure 3The first return channel 32 is a pump return channel, including a first return pipe 321 and a centrifugal pump 322. The centrifugal pump 322 is connected to the first return pipe 321. Part of the effluent from the electrocatalytic zone 2 is returned to the adjustable water distributor 131 through the centrifugal pump 322 to mix with the newly entering wastewater and undergo further treatment. An electromagnetic flow meter 323 is also installed on the first return pipe 321. Please refer to [link / reference]. Figure 5 The second return channel 33 is an air-lift channel, including a second return pipe 331 and an air supply device 332. The air supply device 332 is connected to the second return pipe 331. Part of the effluent from the electrocatalytic zone 2 is returned to the water distribution channel 121 through the air supply device 332 to mix with the newly introduced wastewater and undergo further treatment. The air supply device 332 includes, but is not limited to, a blower. The modular electrocatalytic hydrolysis acidification reaction device is equipped with a dual return channel. On the one hand, a centrifugal pump 322 draws part of the effluent from the electrocatalytic zone 2 into the adjustable water distributor 131 located at the top of the central shaft 132, forming a pump return and enhancing the overall circulation mixing. On the other hand, an air-lift channel is set near the electrocatalytic module 21 at the end of the electrocatalytic zone 2. Air is injected through the air supply device 332, causing part of the effluent from the electrocatalytic zone 2 to return to the water distribution channel 121. By combining pump reflux and airlift reflux, the adjustability of the reflux ratio and the resistance to load fluctuations can be increased. Airlift reflux achieves a high reflux ratio with low energy consumption and regulates the ORP value in the system. Pump reflux is used to achieve efficient stirring and pulse water distribution. The two complement each other and improve the system's processing efficiency.

[0085] Furthermore, the reflux ratio in the first reflux channel 32 is controlled to be (0.5~1):1; 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.

[0086] Furthermore, the modular electrocatalytic hydrolysis acidification reactor also includes an effluent system 6, located above the hydrolysis acidification tank 11. The effluent system 6 includes an effluent trough 61 and an effluent pool 62. The effluent from the modular electrocatalytic hydrolysis acidification reactor is collected through the effluent trough 61 and flows into the effluent pool 62. Specifically, the effluent trough 61 can be positioned higher than the return pipe 31 and closer to the liquid surface, corresponding to the clarification zone in the hydrolysis acidification tank 11, facilitating the collection of clarified effluent.

[0087] The solar power supply system 4 is located above the hydrolysis acidification zone 1 and can provide green energy for key operating components. The solar power supply system 4 is electrically connected to the hydrolysis acidification zone 1, the electrocatalytic zone 2, and the intelligent control system 5. Specifically, the solar power supply system 4 can be electrically connected to the electrocatalytic module 21, indicator lights 22, and the intelligent control system 5 to supply power to the electrocatalytic reaction zone, the PLC control system, indicator lights 22, and other electrical equipment, enabling independent operation of the device. Moreover, the design of the green power module reduces operating costs, reduces dependence on external power and carbon emissions, and avoids the impact of unstable external power grid supply on system performance, allowing the modular electrocatalytic hydrolysis acidification reaction device to operate independently in remote or power-free areas.

[0088] Specifically, please refer to Figure 6 The solar power supply system 4 includes a solar panel 41, a battery pack 42, and a controller 43, which can selectively provide power to the required components. The battery pack 42 can be used to store energy at night or on cloudy days, ensuring that the power supply system is designed to operate continuously for 24 hours under cloudy or rainy conditions. If necessary, a DC / AC inverter can also be configured as needed.

[0089] This invention comprehensively improves the treatment efficiency and operational stability of the hydrolysis acidification process through innovative modular design and joint control strategy. It is also easy to maintain and energy-saving, and is suitable for enhanced pretreatment and comprehensive treatment of various wastewaters.

[0090] Accordingly, a second aspect of the present invention provides a wastewater treatment method, which uses the above-mentioned modular electrocatalytic hydrolysis acidification reactor to treat the wastewater, the treatment method comprising the following steps:

[0091] (1) The wastewater is fed into the hydrolysis acidification zone 1 for hydrolysis acidification treatment;

[0092] (2) The wastewater after being treated in the hydrolysis acidification zone 1 flows into the electrocatalytic zone 2 through the return pipe 31 to perform electrocatalytic treatment on the wastewater;

[0093] (3) The end effluent of the electrocatalytic zone 2 is returned to the hydrolysis acidification zone 1 through the return channel to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reaction device;

[0094] (4) Discharge the effluent after it has been treated by the modular electrocatalytic hydrolysis acidification reaction device.

[0095] Preferably, the residence time ratio of the wastewater in the hydrolysis acidification zone 1 to the electrocatalytic zone 2 is 1:(0.1~0.3). By controlling the residence time of the wastewater in the hydrolysis acidification zone 1 and the electrocatalytic zone 2, the denitrification efficiency is improved, energy consumption is reduced, and the wastewater treatment effect is improved. In some specific and preferred embodiments, the residence time of the wastewater in the hydrolysis acidification zone 1 is 8h~24h, and the residence time of the wastewater in the electrocatalytic zone 2 is 0.5h~3h. The specific residence time in each unit can be adjusted according to the raw water quality.

[0096] Furthermore, the hydrolysis acidification zone 1 is connected to the intelligent control system 5. The monitoring probe 52 in the hydrolysis acidification zone 1 includes an ORP monitor, a pH monitor, and a DO detector to control the ORP value in the hydrolysis acidification tank 11 to be -400mV to 0mV, the pH value to be 6.5 to 8, and the DO value to be less than or equal to 0.2mg / L.

[0097] Furthermore, after electrocatalytic treatment, a portion of the wastewater is returned to the adjustable water distributor 131 via the first return pipe 31 for further treatment, while another portion is returned to the distribution channel 121 via the second return channel 33 for further treatment. Subsequently, the wastewater is mixed with the newly introduced wastewater to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor. During this process, the ratio of the return flow rate to the influent flow rate in the first return channel 32 is controlled at (0.5~1):1; the ratio of the return flow rate to the influent flow rate in the second return channel 33 is controlled at (0.5~2):1, so that the ORP value in the hydrolysis acidification tank 11 is -400mV to 0mV.

[0098] Preferably, in the electrocatalytic zone 2, the operating voltage of the electrode assembly 211 is 0.3V~2V, and the current is 5mA~20mA; the ORP value in the electrocatalytic zone 2 is -200mV~-50mV, and the pH is 6.5~8.

[0099] Furthermore, the microaerobic zone is connected to the intelligent control system 5. The monitoring probes 52 in the intelligent control system 5 are pH monitors, DO monitors, and ORP monitors, to control the DO value in the microaerobic zone to be 0.2 mg / L~0.5 mg / L and the ORP value to be -100 mV~100 mV; and the ORP value in the anoxic zone to be -200 mV~-50 mV.

[0100] In this application, the modular electrocatalytic hydrolysis acidification reactor is used to treat wastewater according to the above treatment method. This can achieve a COD removal rate of 30% to 50% and a total nitrogen removal rate of 20% to 30% for high-concentration wastewater, and a COD removal rate of 15% to 30% and a total nitrogen removal rate of 60% to 70% for medium-concentration wastewater. Moreover, the modular electrocatalytic hydrolysis acidification reactor can operate stably and has significant treatment effects and engineering application value.

[0101] The present invention will be further described below with reference to specific embodiments:

[0102] Example 1

[0103] This embodiment provides a wastewater treatment method, including:

[0104] (1) Test water was introduced into the hydrolysis acidification reaction tank through the water distribution pipe. The test water was kitchen waste biogas slurry wastewater. The influent water quality data were: COD 6500mg / L~13000mg / L, total nitrogen 2500mg / L~3600mg / L, and ammonia nitrogen 2200mg / L~3300mg / L.

[0105] (2) The wastewater from the kitchen waste biogas slurry is fed into the hydrolysis acidification tank. The hydrolysis acidification tank is equipped with a sludge expansion bed with a height of about 60%. The ORP value in the hydrolysis acidification tank is about -400mV, the pH value is about 7, and the DO value is less than or equal to 0.2mg / L, so as to degrade the macromolecular organic matter in the wastewater.

[0106] (3) The effluent from the hydrolysis acidification tank flows into the electrocatalytic zone. The working voltage is 1V and the current is 12mA. The electrocatalytic zone is equipped with 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. The micro-aerobic zone and the anoxic zone are set alternately and continuously. The electrode assembly includes paired electrode plates. After being energized, the electrode plates become paired cathode plates and anode plates. Baffles are set between the electrocatalytic modules. The pH in the electrocatalytic zone is about 7. The ORP value in the anoxic zone is about -50mV. The DO value in the micro-aerobic zone is about 0.35mg / L and the ORP value is about 100mV, which promotes the hydrolysis of high molecular organic matter into easily degradable small molecular organic matter.

[0107] (4) The end effluent from the electrocatalytic zone is returned to the hydrolysis acidification zone through the return channel to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor. The total residence time in the hydrolysis acidification tank is 18h, and the total residence time in the electrocatalytic zone is 2h.

[0108] The reflux channel includes a first reflux channel and a second reflux channel. The first reflux channel is a pump reflux channel, which includes a first reflux pipe and a centrifugal pump. The centrifugal pump is connected to the first reflux pipe. Part of the effluent from the electrocatalytic zone is refluxed back to the adjustable water distributor for further treatment through the centrifugal pump. The reflux ratio of the first reflux channel is controlled at approximately (0.5~1):1.

[0109] The second return channel is an air-lift channel, which includes a second return pipe and an air supply device. The air supply device is connected to the second return pipe. Part of the effluent from the electrocatalytic zone is returned to the water distribution channel through the air supply device for further treatment. The return ratio of the second return channel is controlled at about (0.5~2):1, which is used to control the ORP value in the hydrolysis acidification tank to about -400mV.

[0110] (5) Discharge the effluent after it has been treated by the modular electrocatalytic hydrolysis acidification reaction device.

[0111] The test water and the effluent treated by the above method were measured, and the results are as follows: Figures 7-10 As shown.

[0112] Figure 7 The graph shows the COD removal efficiency before and after treatment of kitchen waste biogas slurry wastewater. In the initial stage of operation (August 19-25), the influent COD was approximately 6800 mg / L to 7800 mg / L, corresponding to an effluent COD of approximately 4700 mg / L to 5500 mg / L, with a removal rate between 25% and 30%, demonstrating the rapidly established synergistic effect of hydrolysis acidification and electrocatalysis. In the middle stage of operation (August 26-September 5), even with the influent COD increasing to 9000 mg / L to 10500 mg / L, the effluent concentration rose slightly, but the removal rate remained stable at approximately 40% to 50%, proving that the triple synergy of hydrolysis acidification, pulsed water distribution, and electrocatalytic micro-oxygenation maintained relatively stable treatment efficiency under high load conditions. At the end of the operation period (September 6-29), the influent COD increased again to 10,000 mg / L~13,000 mg / L, but the effluent COD was still controlled at 5,500 mg / L~7,000 mg / L. The removal rate exceeded 40% for most periods, which fully verified the adaptability and enhancement ability of electrocatalytic hydrolysis acidification to wastewater.

[0113] Figure 8The graph shows the total nitrogen removal effect before and after treatment of kitchen waste biogas slurry wastewater. The influent total nitrogen concentration fluctuates within the range of 2500 mg / L to 3600 mg / L, while the effluent total nitrogen concentration decreases to 1400 mg / L to 2600 mg / L. Specifically, in the initial operation phase (July 6th to July 10th), the system showed good nitrogen removal performance and was still in the adaptation period. In the stable operation phase (July 11th to August 2nd), the total nitrogen removal rate remained at 20% to 30%, indicating that the nitrogen removal function had reached equilibrium. This fully demonstrates the significant support of microaerobic aeration for the linkage between nitrification and denitrification and the activity of the denitrification community.

[0114] Figure 9 The graph shows the ammonia nitrogen removal efficiency before and after treatment of kitchen waste biogas slurry wastewater. The ammonia nitrogen influent fluctuates between 2200 mg / L and 3300 mg / L, indicating a high proportion of ammonia nitrogen in the total nitrogen, making it the main contributor to total nitrogen. In the early stage of operation (July 6th-July 19th), the system showed good nitrification, with an ammonia nitrogen removal rate of 30%-40%; in the later stage (July 20th-August 2nd), the ammonia nitrogen removal rate remained at 20%-30%.

[0115] Figure 10 This is a microbial community diagram of a modular electrocatalytic hydrolysis acidification reactor. From the community bar chart, it can be seen that the microbial composition of the electrocatalytic hydrolysis acidification reactor is dominated by anaerobic bacteria (such as...). Anaerolineaceae ), fermentation hydrolysants (such as Sedimentibacter , Proteiniphilum ) and obligate acid-producing bacteria (such as Fermentimonas Dominated by these bacteria, these microbial communities enable the system to maintain efficient hydrolysis and acidification. Furthermore, functional denitrifying bacteria (such as...) were also observed. Thiopseudomonas During operation, the relative abundance of the denitrification functional community increased slightly, indicating that electrocatalysis and micro-aeration provided a favorable microenvironment for ammonia nitrogen oxidation and nitrate reduction, achieving synergistic removal of carbon and nitrogen and enrichment of functional bacterial communities while maintaining the stable function of the core hydrolysis and acidification community.

[0116] The pilot-scale data demonstrate that the modular electrocatalytic hydrolysis acidification reactor described in this application has significant denitrification advantages and good engineering feasibility when treating high-concentration wastewater.

[0117] Example 2

[0118] This embodiment provides a wastewater treatment method, which is basically the same as that in Embodiment 1, except that:

[0119] The test water was mixed wastewater (including photovoltaic manufacturing wastewater, etc.) from an industrial park treated by a pilot project. The influent water quality characteristics were: COD 250mg / L~400mg / L, total nitrogen (TN) 40mg / L~60mg / L, of which ammonia nitrogen accounted for about 10%~20% of TN.

[0120] Correspondingly, the ORP value in the hydrolysis acidification tank is -250mV to 0mV, and the ORP value in the electrocatalytic zone is -200mV to 50mV. In the anoxic zone, the ORP value is approximately -200mV to -50mV. In the microaerobic zone, the DO value is approximately 0.35mg / L, and the ORP value is approximately -100mV to 50mV.

[0121] The test water and the effluent treated by the above method were measured, and their structures were as follows: Figures 11-12 As shown.

[0122] Figure 11 The graph shows the COD removal efficiency before and after treatment of mixed wastewater (including photovoltaic manufacturing wastewater) from an industrial park. As can be seen from the graph, the COD removal rate is 15%–30%.

[0123] Figure 12 The graph shows the total nitrogen removal effect before and after treatment of mixed wastewater (including photovoltaic manufacturing wastewater, etc.) in the industrial park. As can be seen from the graph, the TN removal rate can reach 60%~70% during the stable operation period.

[0124] Because the influent ammonia nitrogen concentration is low, the denitrification effect of this system is mainly reflected in the removal of nitrite, nitrate, and organic nitrogen. The aerobic / anoxic microenvironment generated by electrocatalysis and micro-aerobic alternation, as well as the increased supply of volatile fatty acids (VFA), provide favorable conditions for nitrification-denitrification coupling, thereby achieving efficient total nitrogen conversion and removal.

[0125] The pilot-scale data demonstrate that the modular electrocatalytic hydrolysis acidification reactor described in this application also has significant denitrification advantages and good engineering feasibility when treating medium-concentration industrial wastewater.

[0126] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A modular electrocatalytic hydrolysis acidification reaction device, characterized in that, The modular electrocatalytic hydrolysis acidification reactor is used to treat wastewater and includes: a hydrolysis acidification zone, an electrocatalytic zone, a reflux system, a solar power supply system, and an intelligent control system. The effluent from the hydrolysis acidification zone flows into the electrocatalytic zone through a reflux pipe, and the end effluent from the electrocatalytic zone flows into the hydrolysis acidification zone through a 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. The electrocatalytic modules are provided with baffles; the baffles are alternately spaced in the horizontal direction or alternately spaced in the vertical direction. Each of the electrocatalytic modules also includes an indicator light, which is electrically connected to the electrode assembly; The aeration device includes an aeration disc, an aeration hose, and a blower, wherein the aeration disc and the blower are connected via the aeration hose. The electrode assembly includes a pair of electrode plates, each electrode plate consisting of a support and an electrocatalytic filler fixed to the support, wherein the electrocatalytic filler is a carbon fiber electrocatalytic filler. The intelligent control system is connected to the hydrolysis acidification zone, the electrocatalytic zone, and the solar power supply system; the intelligent control system includes a monitoring station and monitoring probes electrically connected to the monitoring station; the monitoring probes include a DO monitor, an ORP monitor, a pH monitor, a flow monitor, and a conductivity monitor; The electrocatalytic zone has an ORP value of -200mV to 100mV and a pH of 6.5 to 8. The microaerobic zone has a DO value of 0.2mg / L to 0.5mg / L and an ORP value of -100mV to 100mV. The anoxic zone has an ORP value of -200mV to -50mV. The ORP value in the hydrolysis acidification tank is -400mV to 0mV, the pH value is 6.5 to 8, and the DO value is less than or equal to 0.2mg / L; The residence time ratio of the wastewater in the hydrolysis acidification zone to the electrocatalytic zone is 1:(0.1~0.3).

2. The modular electrocatalytic hydrolysis acidification reaction apparatus as described in claim 1, characterized in that, The hydrolysis acidification tank includes: A hydrolysis acidification tank, wherein the hydrolysis acidification sludge is disposed at the bottom of the hydrolysis acidification tank; A water inlet system, the water inlet system including a water distribution channel for uniform water inlet, and a water distribution pipe connected to the water distribution channel; A water distribution system, comprising an adjustable water distributor, a central shaft, and a water distribution system, wherein the central shaft is located within the hydrolysis acidification tank, and the water distribution pipe is connected to the inner cavity of the central shaft, so that wastewater enters the interior of the central shaft from the water distribution channel through the water distribution pipe; The top of the central shaft is connected to the adjustable water distributor, and the bottom of the central shaft is connected to the water distribution system, so that the wastewater in the central shaft enters the hydrolysis acidification tank through the water distribution system. The effluent from the end of the electrocatalytic zone flows into the water distribution system of the hydrolysis acidification zone through a reflux channel.

3. The modular electrocatalytic hydrolysis acidification reaction apparatus as described in claim 2, characterized in that, The return channel includes a first return channel and a second return channel; The first return channel is a pump return channel, including a first return pipe and a centrifugal pump. The centrifugal pump is connected to the first return pipe. Part of the effluent from the electrocatalytic zone is returned to the adjustable water distributor through the centrifugal pump to mix with the newly introduced wastewater and undergo further treatment. An electromagnetic flow meter is also installed on the first return pipe. The second return channel is an air-lift channel, which includes a second return pipe and an air supply device. The air supply device is connected to the second return pipe. Part of the effluent from the electrocatalytic zone is returned to the water distribution channel through the air supply device to mix with the newly introduced wastewater and undergo further treatment.

4. The modular electrocatalytic hydrolysis acidification reaction apparatus as described in claim 2, characterized in that, The hydrolysis acidification tank also includes a sludge discharge system, which is located at the bottom of the hydrolysis acidification tank and is used to discharge the sludge inside the hydrolysis acidification tank.

5. The modular electrocatalytic hydrolysis acidification reaction apparatus as described in claim 1, characterized in that, The modular electrocatalytic hydrolysis acidification reaction device also includes a water outlet system, which is located above the hydrolysis acidification tank; The water outlet system includes an outlet tank and an outlet pool. The water outlet from the modular electrocatalytic hydrolysis acidification reaction device is collected in the outlet tank and flows into the outlet pool.

6. The modular electrocatalytic hydrolysis acidification reaction apparatus as described in claim 1, characterized in that, The solar power supply system is located above the hydrolysis acidification zone; The solar power supply system includes solar cell arrays, battery arrays, and a controller; The solar power supply system is electrically connected to the hydrolysis acidification zone and the electrocatalytic zone.

7. A method for treating wastewater, characterized in that, Wastewater is treated using the modular electrocatalytic hydrolysis acidification reactor as described in any one of claims 1 to 6, the treatment method comprising the following steps: (1) The wastewater is fed into the hydrolysis acidification zone for hydrolysis acidification treatment; (2) The wastewater after being treated in the hydrolysis and acidification zone flows into the electrocatalytic zone through the return pipe for electrocatalytic treatment; (3) The end effluent of the electrocatalytic zone is returned to the hydrolysis acidification zone through the reflux channel to adjust the residence time of the wastewater in the modular electrocatalytic hydrolysis acidification reactor; (4) Discharge the effluent after it has been treated by the modular electrocatalytic hydrolysis acidification reaction device.

8. The wastewater treatment method as described in claim 7, characterized in that, In the electrocatalytic region, the electrode assembly operates at a voltage of 0.3V to 2V and a current of 5mA to 20mA.

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