A kind of enhanced denitrification device of electrolysis-microelectrolysis-anaerobic combined process

Abstract

This invention relates to an enhanced denitrification device, specifically an enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process, comprising a denitrification container and an external power supply. The inner cavity of the denitrification container is divided into a wastewater treatment zone and an anaerobic water collection zone by a water collection control grid. The wastewater treatment zone has an inlet at the top, and the water collection control grid has a water collection outlet connecting the wastewater treatment zone and the anaerobic water collection zone. The anaerobic water collection zone has a sludge discharge outlet and a water outlet on its side. The wastewater treatment zone is filled with iron-carbon microelectrolysis packing material. Several electrode plates are also spaced apart within the wastewater treatment zone, with anode and cathode plates alternating. The anode plates are connected to the positive terminal of the external power supply, and the cathode plates are connected to the negative terminal of the external power supply. Compared with existing technologies, this invention solves the problems of high energy consumption in external power supply-driven electrolysis and limitations of iron-carbon microelectrolysis in existing technologies, achieving a combined use of external power supply electrolysis and iron-carbon microelectrolysis, providing enhanced denitrification capability for wastewater with a low carbon-to-nitrogen ratio and lower energy consumption.

Description

Technical Field

[0001] This invention relates to an enhanced denitrification device, specifically an enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process. Background Technology

[0002] my country's total freshwater resources amount to 2.8 trillion cubic meters. 3 It accounts for 6% of global water resources, second only to Brazil, Russia, and Canada, but its per capita water resources are only 2300 m³. 3 With only a quarter of the world average, China is one of the countries with the most scarce per capita water resources globally. As a major agricultural country, China currently has over 41,360 townships and villages, with approximately 510 million people living in rural areas. Unlike urban areas, rural populations are less concentrated, and sewage collection and treatment facilities are scarcer. According to data from the Ministry of Housing and Urban-Rural Development, the urban sewage treatment rate exceeded 97% in 2020, but rural sewage treatment still has significant shortcomings, with a treatment rate of only 28% in 2021. Currently, numerous sewage treatment technologies have emerged, but most are centralized, reflecting the general characteristics of urban domestic sewage. However, rural domestic sewage differs from urban sewage, especially in northern regions. Due to the insufficient carbon-to-nitrogen ratio, the sewage has poor biodegradability. Furthermore, limitations imposed by infrastructure construction, pipeline investment, and high maintenance costs mean that the treatment of decentralized rural domestic sewage cannot simply replicate urban sewage treatment models; new technologies are needed to address rural domestic sewage.

[0003] The scarcity of organic carbon sources has become a bottleneck restricting traditional rural domestic wastewater treatment processes, especially for the efficient removal of total nitrogen (TN). For a long time, denitrification has been considered the only way to convert reactive nitrogen into nitrogen gas (N2). However, in actual rural domestic wastewater treatment processes, the denitrification capacity of traditional nitrification and denitrification for high-nitrogen, low-carbon wastewater is limited to a certain level. Furthermore, because traditional anaerobic denitrification processes require a large amount of carbon source, external carbon sources are often needed to supplement the deficiency, resulting in high wastewater treatment costs. Micro-electrolysis technology typically uses cast iron scrap and activated carbon as electrode materials, with iron as the anode and carbon as the cathode. A large number of micro-galvanic cells are formed by the 1.2V potential difference between iron and carbon elements, generating electrons and reducing substances to reduce pollutants in the wastewater. The water electrolysis reaction generates a slight external voltage around the electrodes; the H2 produced at the cathode can improve denitrification efficiency through hydrogen autotrophic denitrification. Furthermore, electroactive microorganisms enriched near the electrodes can also transfer electrons from the electrodes to nitrates; the O2 generated at the anode can provide nitrifying bacteria with the ability to improve nitrification efficiency and remove NH4. +The iron-carbon microelectrolysis process, therefore, occupies less space, consumes less energy, continuously enhances denitrification, and produces fewer byproducts, making it highly promising for practical applications. Electrolytic denitrification, on the other hand, is unsuitable for practical engineering applications due to its high energy consumption.

[0004] The invention patent with publication number CN110104735A describes the reaction of hydrogen and oxygen produced by an electrolysis machine with ammonia nitrogen and NO in water. 3- The reaction produces H2O and N2, removing ammonia nitrogen and total nitrogen from slightly polluted water bodies. The invention patent with publication number CN110697877A couples biological ammonia oxidation and electrode biofilm denitrification to treat wastewater for denitrification and methanogenesis. The entire reaction process eliminates the need for aeration, accelerating denitrification efficiency and saving energy. The utility model patent with publication number CN216614119U uses an iron-carbon particle packing layer to form numerous micro-galvanic cells in the wastewater, thereby removing Fe... 2+ Oxidized to Fe 3+ This forms ferric hydroxide colloids, achieving flocculation and sedimentation, adsorbing and coagulating pollutants in wastewater, thereby enhancing the purification effect of wastewater.

[0005] However, the above technologies still have the following drawbacks: 1. Ordinary external power supply electrolysis technology has high energy consumption. In urban sewage treatment processes, there are better alternatives. When applied to rural sewage treatment, its operation and maintenance costs greatly limit the large-scale coverage of this technology in rural areas. 2. Simply adding iron-carbon micro-electrolysis fillers has its limitations. Most iron-carbon micro-electrolysis fillers need acidic conditions to maximize their sewage treatment effect, which is not friendly to the operation and maintenance costs in rural areas.

[0006] Therefore, a new type of enhanced denitrification device is needed to achieve enhanced denitrification capacity for wastewater with low carbon-to-nitrogen ratio. Summary of the Invention

[0007] The purpose of this invention is to provide an enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process to solve at least one of the above-mentioned problems. This addresses the issues of high energy consumption in existing technologies such as powered electrolysis and the limitations of simple iron-carbon microelectrolysis. The invention achieves the combined use of powered electrolysis and iron-carbon microelectrolysis, demonstrating enhanced denitrification capabilities for wastewater with low carbon-to-nitrogen ratios while maintaining low energy consumption.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] An enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process includes a denitrification vessel and an external power supply;

[0010] The denitrification container's inner cavity is divided into a wastewater treatment area and an anaerobic water collection area by a water collection control grid;

[0011] The wastewater treatment area is provided with an inlet at the top, and the water collection control grid is provided with a water collection outlet connecting the wastewater treatment area and the anaerobic water collection area. The anaerobic water collection area is provided with a sludge discharge outlet and a water outlet on the side.

[0012] The wastewater treatment area is filled with iron-carbon micro-electrolysis packing material;

[0013] The wastewater treatment area is also provided with several electrode plates at intervals, with anode plates and cathode plates alternating; the anode plates are connected to the positive terminal of the external power supply, and the cathode plates are connected to the negative terminal of the external power supply.

[0014] Preferably, the iron-carbon micro-electrolysis packing material is an elliptical packing material; the porosity of the iron-carbon micro-electrolysis packing material filling the sewage treatment area is 30-65%, and the specific surface area is 0.5-1.2 m². 2 / g. Ensures that the pre-treated water flows uniformly across the surface of the iron-carbon micro-electrolysis packing material to continuously carry out a series of biological, physical, and chemical reactions.

[0015] Preferably, the anode plate is an iron electrode plate; the cathode plate is a graphite electrode plate. This design specifically selects an iron-graphite composition for electrolytic denitrification, preferably consistent with the material of the iron-carbon micro-electrolysis filler; firstly, this is to save costs, as the materials for the anode and cathode are relatively easy to obtain; secondly, iron, as the anode, forms Fe after losing electrons. 3+ and Fe 2+ This can form colloids, accelerating the adsorption and precipitation of pollutants. Simultaneously, iron salts and phosphates can also form various precipitated compounds, enhancing the removal of total phosphorus by the device. Finally, the Fe formed at the cathode and anode... 2+ With H + It can also form a weaker Fenton system, which can enhance the oxidation-reduction capacity of organic matter and total nitrogen, thereby achieving the goal of efficient removal of pollutants.

[0016] Preferably, a first electrode plate, a second electrode plate, and a third electrode plate are vertically spaced within the wastewater treatment area. The first and third electrode plates are anode plates, and the second electrode plate is a cathode plate. Three electrode plates are used because the overall flow path of the wastewater treatment area is relatively long (and the height is relatively high). Furthermore, during actual operation, most of the flow passing through the iron-carbon micro-electrolysis packing and the electrode surfaces is intermittent flow. If the distance between the electrode plates is too large, the intensity of the micro-current will decrease. Therefore, three electrode plates are preferred in this design. The reason for using two anodes and one cathode is that the iron electrode, as the anode, generates Fe... 2+ with Fe 3+ It plays a significant role in this system, promoting the occurrence and progress of various reaction processes.

[0017] Preferably, the sludge discharge port is located at the bottom of the anaerobic water collection area, the water collection port is located higher than the sludge discharge port, and the water outlet is located higher than the water collection port.

[0018] Preferably, the water collection inlet is located at 1 / 5 of the height of the denitrification container, and the water outlet is located at 4 / 5 of the height of the denitrification container. Because the iron-carbon micro-electrolysis packing has a strong flocculation and sedimentation effect, a certain amount of sludge will be generated during the operation cycle; setting the water outlet at a certain height ensures a certain hydraulic retention time.

[0019] Preferably, the water collection inlets are spaced out in several places, and the aperture of the water collection inlets is smaller than the size of the iron-carbon micro-electrolysis packing material, so as to ensure that the SS (suspended solids) content in the water in the anaerobic water collection area is low and the water discharged from the outlet is clear.

[0020] Preferably, the external power supply is a DC regulated power supply that can control constant current and constant voltage modes.

[0021] Preferably, the electrode plate is horizontally arranged, and the use of a larger electrode plate can ensure sufficient contact between the water flow and the electrode plate. The electrode plate is electrically connected to an external power source through an electrode clamp and a wire. The connection between the electrode plate and the electrode clamp, as well as the connection between the electrode clamp and the wire, are sealed with waterproof adhesive to prevent leakage and corrosion.

[0022] Preferably, the sludge discharge port is connected to a sludge discharge pipeline, and a sludge discharge control valve is installed on the sludge discharge pipeline; the water outlet is connected to a water outlet pipeline, and a water outlet control valve is installed on the water outlet pipeline.

[0023] The working principle of this invention is as follows:

[0024] Low-carbon-nitrogen ratio domestic sewage enters the sewage treatment area through the inlet of the front-end distribution network. Under gravity, it flows through the iron-carbon micro-electrolysis packing material and sequentially through each electrode plate; during this process, a series of biophysical and chemical reactions continuously occur. Examples of some biochemical reactions are as follows: 1. Bioadsorption: Microorganisms can remove pollutants from water by adsorbing them. Microorganisms attach to the surface of the packing material and form a biofilm, adsorbing pollutant molecules, intercepting them from the water, and fixing them in the biofilm. Most of these anaerobic microorganisms are chemoautotrophic, requiring energy from the energy difference in redox processes, such as using the redox reaction of carbon sources in the sewage. However, due to the lack of carbon sources in low-carbon-nitrogen ratio wastewater, these microorganisms lack energy. In this case, the iron-carbon micro-electrolysis packing material and electrodes can provide electron donors, promoting their redox processes and enabling them to obtain energy. 2. Biodegradation: Microorganisms can decompose organic matter, converting it into harmless substances or more easily treated forms. Microorganisms attached to the surface of the packing material use pollutants as energy and nutrient sources, decomposing them into simpler substances through metabolic pathways. 3. Redox Reactions: The iron and carbon in the iron-carbon micro-electrolysis packing material can serve as electrode materials to participate in electrochemical reactions. Simultaneously, the electrodes are aligned with the packing material; through electrolysis, the iron and carbon on the packing surface undergo redox reactions, generating electron and charge transfer. These reactions can promote redox reactions in wastewater, contributing to the degradation of pollutants.

[0025] After being treated by electrolysis and micro-electrolysis, the water flows through the collection port to the anaerobic water collection area for anaerobic denitrification, and is discharged after the water level reaches the height of the outlet.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention combines external power supply-driven high-intensity electrolysis technology with iron-carbon micro-electrolysis technology, improving upon the high energy consumption of high-intensity electrolysis technology and the high environmental requirements and large fluctuations in treatment effect of micro-electrolysis technology. It achieves reduced energy consumption while maintaining good treatment effect, and preliminary experiments have yielded the same conclusion. It has the advantages of simple structure, lightweight device, and high sewage load capacity, and can be quickly put into use, making it suitable for rural domestic sewage treatment.

[0028] 2. The particle size of the iron-carbon micro-electrolysis packing material in the wastewater treatment area of ​​this invention can be changed according to the effect of the front-end treatment. When the front-end treatment effect is good, a smaller particle size iron-carbon micro-electrolysis packing material can be selected, and vice versa. This makes it more compatible with different processes.

[0029] 3. The device system of the present invention can be used as a back-end processing module for different treatment processes, and can be flexibly connected. Without changing the existing facilities, the carbon-nitrogen ratio imbalance of the effluent can be improved, thereby reducing costs.

[0030] 4. The present invention has a water collection area to ensure the denitrification process, maintain a certain residence time, enhance the removal effect of pollutants by the device, and at the same time set up sludge discharge and sedimentation to prevent the concentration of suspended solids in the effluent from being too high. Attached Figure Description

[0031] Figure 1 This is a schematic cross-sectional view of the enhanced denitrification device in the embodiment;

[0032] Figure 2 This is a schematic diagram of the structure of the water collection control grid in an embodiment;

[0033] In the diagram: 1-Iron-carbon micro-electrolysis packing; 2-First electrode plate; 3-Second electrode plate; 4-Third electrode plate; 5-Electrode clamp; 6-Outlet; 7-Sludge discharge port; 8-Outlet control valve; 9-Sludge discharge control valve; 10-External power supply; 11-Anaerobic water collection area; 12-Wastewater treatment area; 13-Water collection control grid; 14-Water collection port. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] Example

[0036] An enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process, such as Figure 1 and Figure 2 As shown, it includes a denitrification container and an external power supply 10;

[0037] The inner cavity of the denitrification container is divided into a wastewater treatment area 12 and an anaerobic water collection area 11 by a water collection control grid 13;

[0038] The wastewater treatment zone 12 is provided with an inlet at the top, and the water collection control grid 13 is provided with a water collection port 14 connecting the wastewater treatment zone 12 and the anaerobic water collection zone 11. The anaerobic water collection zone 11 is provided with a sludge discharge port 7 and a water outlet 6 on the side.

[0039] The wastewater treatment zone 12 is filled with iron-carbon micro-electrolysis packing material 1;

[0040] The wastewater treatment zone 12 is also provided with several electrode plates at intervals, and the anode plates and cathode plates are arranged alternately; the anode plates are connected to the positive terminal of the external power supply 10, and the cathode plates are connected to the negative terminal of the external power supply 10.

[0041] More specifically, in this embodiment:

[0042] The enhanced denitrification device includes an anaerobic water collection zone 11 on the left side of the internal cavity of the denitrification container, a wastewater treatment zone 12 on the right side of the cavity, and an external power supply 10.

[0043] The anaerobic water collection zone 11 is an anaerobic chamber. Its left side is the outer wall of the denitrification container, with an outlet 6 and a sludge discharge outlet 7 arranged from top to bottom. The outlet 6 is connected to an outlet pipe, and an outlet control valve 8 is installed on the outlet pipe. The sludge discharge outlet 7 is connected to a sludge discharge pipe, and a sludge discharge control valve 9 is installed on the sludge discharge pipe. The right side of the anaerobic water collection zone 11 is a water collection control grille 13. Several equal-sized and equally spaced water collection outlets 14 are located near the bottom of the water collection control grille 13, connecting the anaerobic water collection zone 11 and the wastewater treatment zone 12.

[0044] The wastewater treatment zone 12 is uniformly covered with iron-carbon micro-electrolysis packing 1, which can be a commercially available general-purpose iron-carbon micro-electrolysis packing 1. The wastewater treatment zone 12 is provided with three electrode plates at equal intervals from top to bottom, namely the first electrode plate 2, the second electrode plate 3, and the third electrode plate 4, wherein the first electrode plate 2 is an iron electrode plate, the second electrode plate 3 is a graphite electrode plate, and the third electrode plate 4 is an iron electrode plate.

[0045] The external power supply 10 is a DC regulated power supply, and commercially available products can be used. The positive terminal of the power supply is connected to the first electrode plate 2 and the third electrode plate 4, and the negative terminal is connected to the second electrode plate 3. Specifically, copper wires are used to connect the external cavity of the denitrification container, and platinum electrode clips 5 are used to connect the internal cavity of the denitrification container to each electrode plate. Furthermore, the connections are sealed with waterproof adhesive to prevent leakage of treated water, which could cause electrical leakage and corrosion and aging of electrical components.

[0046] After entering the sewage treatment area 12 through the front-end water distribution network, domestic sewage flows through the iron-carbon micro-electrolysis packing 1 under the action of gravity, and flows through each electrode plate in sequence, undergoing a series of biophysical and chemical reactions. The treated water flows through the anaerobic water collection area 11 through the water collection port 14, and after reaching the height of the water outlet 6, it is discharged by the water discharge control valve 8.

[0047] like Figure 1 As shown, the internal dimensions of this denitrification container are 350mm × 350mm × 500mm; the dimensions of the anaerobic water collection zone 11 are 50mm × 350mm × 500mm, and the dimensions of the wastewater treatment zone 12 are 300mm × 350mm × 500mm. An external power supply 10 can control constant current and constant voltage modes.

[0048] The anaerobic water collection zone 11 has a sludge discharge port 7 with a diameter of 25mm at the bottom. Due to the strong flocculation and sedimentation effect of the iron-carbon micro-electrolysis packing 1, a certain amount of sludge will be generated as the operation cycle progresses. The sludge discharge pipe connected to the sludge discharge port 7 and the sludge discharge control valve 9 installed on it can be opened periodically to perform sludge discharge operation. An outlet 6 is provided at a distance of 400mm from the bottom. By setting the outlet 6 at a certain height, a certain hydraulic retention time is ensured in the anaerobic water collection zone 11. The outlet 6 is connected to the outlet pipe and an outlet control valve 8 is installed on it to control the outlet flow rate.

[0049] The interior of wastewater treatment zone 12 is uniformly filled with iron-carbon micro-electrolysis packing material 1, with a porosity of 65% and a specific surface area of ​​1.2 m². 2 / g, with elliptical dimensions of 30-50mm, ensuring that the treated water flows evenly across the surface of the iron-carbon micro-electrolysis packing 1 to carry out a series of biophysical and chemical reactions; the wastewater treatment zone 12 is equipped with three electrode plates at equal intervals from top to bottom, wherein: the first electrode plate 2 is an iron electrode plate, 100mm from the top of the wastewater treatment zone 12, with dimensions of 250mm×250mm×3mm; the second electrode plate 3 is a graphite electrode plate, 2150mm from the first electrode plate, with dimensions of 250mm×250mm×3mm; the third electrode plate 4 is an iron electrode plate, 3150mm from the second electrode plate, with dimensions of 250mm×250mm×3mm. The electrode plates have a large surface area, which can ensure sufficient contact between the water flow and the electrode plates to maximize the reaction.

[0050] The external power supply 10 has an adjustable voltage range of 0-60V, an adjustable current range of 0-8A, a power of 180W, and a resolution of 10mV / 1mA.

[0051] like Figure 2 As shown, the dimensions of the water collection control grid 13 are 350mm × 500mm, with 10 water collection inlets 14 having a diameter of 25mm each, located 100mm from the bottom. The diameter of the water collection inlets 14 is much smaller than that of the iron-carbon micro-electrolysis packing 1, ensuring that the SS content of the water in the anaerobic water collection zone 11 is low and the effluent is clear.

[0052] The enhanced denitrification unit operates under anaerobic conditions, with an inlet structure connected at the front end, and uses a continuous water intake method.

[0053] In this embodiment, the denitrification container is made of high-strength plexiglass to facilitate observation of the internal conditions and phenomena during the experiment. In practical applications, conventional materials in the field can be used as substitutes.

[0054] Working principle:

[0055] Rural domestic sewage from the pre-collection system (existing structure) first undergoes pretreatment methods such as sedimentation, filtration and anaerobic fermentation to reduce the SS content of the sewage; and the COD in the sewage is also pre-treated until the dissolved oxygen in the sewage is reduced to meet the anaerobic standard, and then it continuously enters this system through some influent devices.

[0056] In the enhanced denitrification device, pretreated domestic sewage enters from the top of the sewage treatment zone 12 through an externally installed water distribution pipeline. Under the action of gravity, it directly seeps downwards and seeps downwards while flowing laterally in the iron-carbon micro-electrolysis packing 1. While flowing through the gaps of the iron-carbon micro-electrolysis packing 1, it also flows through the corresponding electrode plates.

[0057] Traditional pollution removal pathways exist in enhanced denitrification devices: after successful biofilm formation, microorganisms grow on the surface of the iron-carbon micro-electrolysis packing 1 in the system, forming a biofilm; dissolved organic matter is adsorbed by the packing and further degraded by the biofilm on the surface of the packing.

[0058] Meanwhile, countless micro-batteries will form on the surface of the iron-carbon micro-electrolysis packing 1, providing electron donors and electron acceptors for the biochemical reactions of microorganisms. The cathode and anode plates have similar functions and can replace the role of carbon sources in wastewater with low carbon-to-nitrogen ratios, thereby enhancing the removal of total nitrogen.

[0059] The ferrous iron generated on the surface of the iron-carbon micro-electrolysis filler 1 is oxidized to ferric iron, forming ferric hydroxide colloid, which co-precipitates with phosphorus compounds, thereby achieving the effect of phosphorus removal.

[0060] Wastewater from the wastewater treatment zone 12 leachates into the anaerobic collection zone 11, where it remains for a relatively long hydraulic retention time, creating an anaerobic environment where the wastewater undergoes further anaerobic decomposition. The solid waste produced by the reaction first settles at the bottom of the collection zone, and then is periodically discharged by opening the sludge discharge valve.

[0061] The pilot-scale device built using this technology employed a hydraulic load of 1.2m. 3 / m 2 / d; The water treatment effect was good and it can operate stably and continuously.

[0062] This invention realizes the combined use of external power electrolysis and iron-carbon micro-electrolysis packing material under anaerobic conditions (electrolysis-micro-electrolysis-anaerobic combined process), which greatly improves the denitrification performance of the enhanced denitrification device and reduces energy consumption; at the same time, the enhanced denitrification device can be used as a back-end treatment module in the existing sewage treatment system, and has strong coupling with various traditional sewage treatment systems, which can solve the problem of high nitrogen domestic sewage treatment and discharge in rural areas with low carbon-nitrogen ratio.

[0063] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An enhanced denitrification device using a combined electrolysis-microelectrolysis-anaerobic process, characterized in that, Includes a denitrification vessel and an external power supply (10); The inner cavity of the denitrification container is divided into a wastewater treatment area (12) and an anaerobic water collection area (11) by a water collection control grid (13). The wastewater treatment area (12) is provided with an inlet at the top. The water collection control grid (13) is provided with a water collection port (14) connecting the wastewater treatment area (12) and the anaerobic water collection area (11). The anaerobic water collection area (11) is provided with a sludge discharge port (7) and a water outlet (6) on the side. The sludge discharge port (7) is located at the bottom of the anaerobic water collection area (11). The water collection port (14) is located higher than the sludge discharge port (7). The water outlet (6) is located higher than the water collection port (14). The water collection port (14) is located at 1 / 5 of the height of the denitrification container. The water outlet (6) is located at 4 / 5 of the height of the denitrification container. The sludge discharge port (7) is connected to a sludge discharge pipeline. A sludge discharge control valve (9) is provided on the sludge discharge pipeline. The water outlet (6) is connected to an outlet pipeline. An outlet control valve (8) is provided on the outlet pipeline. The wastewater treatment area (12) is filled with iron-carbon micro-electrolysis filler (1); The wastewater treatment area (12) is vertically spaced with a first electrode plate (2), a second electrode plate (3) and a third electrode plate (4). The first electrode plate (2) and the third electrode plate (4) are anode plates, and the second electrode plate (3) is a cathode plate. The anode plate is an iron electrode plate and is connected to the positive terminal of the external power supply (10). The cathode plate is a graphite electrode plate and is connected to the negative terminal of the external power supply (10). Biosorption, biodegradation, and redox reactions occur within the wastewater treatment zone (12); Biosorption: Anaerobic microorganisms attach to the surface of the iron-carbon micro-electrolysis packing (1) and form a biofilm. By adsorbing pollutant molecules, they intercept and fix them from the water in the biofilm. At the same time, the iron-carbon micro-electrolysis packing (1) and the electrode plate provide electron donors to promote the redox process; Biodegradation: Microorganisms attached to the surface of the iron-carbon micro-electrolysis packing (1) use pollutants as energy and nutrient sources and decompose them through metabolic pathways; Redox reaction: The iron-carbon micro-electrolysis packing (1) undergoes electrolysis with the electrode plate, and the iron in it loses electrons to form Fe 3+ and Fe 2+ The formation of colloids accelerates the adsorption and precipitation of pollutants. Iron salts and phosphates also form various precipitated compounds that are removed. Simultaneously, Fe formed at the annode and cathode... 2+ With H + It also forms a weak Fenton system to enhance the oxidation-reduction capacity of organic matter and total nitrogen; anaerobic denitrification occurs in the anaerobic water collection area (11).

2. The enhanced denitrification device for an electrolysis-microelectrolysis-anaerobic combined process according to claim 1, characterized in that, The iron-carbon micro-electrolysis packing material (1) is an elliptical packing material; the porosity of the iron-carbon micro-electrolysis packing material (1) filling the sewage treatment area (12) is 30-65%, and the specific surface area is 0.5-1.2 m². 2 / g.

3. The enhanced denitrification device for an electrolysis-microelectrolysis-anaerobic combined process according to claim 1, characterized in that, The water collection port (14) is provided at intervals, and the aperture of the water collection port (14) is smaller than the size of the iron-carbon micro-electrolysis packing (1).

4. The enhanced denitrification device for an electrolysis-microelectrolysis-anaerobic combined process according to claim 1, characterized in that, The external power supply (10) is a DC regulated power supply.

5. The enhanced denitrification device for an electrolysis-microelectrolysis-anaerobic combined process according to claim 1, characterized in that, The electrode plate is horizontally arranged; the electrode plate is electrically connected to an external power supply (10) through an electrode clamp (5) and a wire, and the connection between the electrode plate and the electrode clamp (5) and the connection between the electrode clamp (5) and the wire are sealed with waterproof glue.

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