A device and method for treating industrial wastewater with high COD, high ammonia nitrogen and low chlorine

Abstract

The application provides a treatment device for high-COD high-ammonia-nitrogen low-chlorine industrial wastewater. The device realizes a treatment method for high-COD high-ammonia-nitrogen low-chlorine industrial wastewater. Through the action of an electric field, on one hand, porous anodes adsorb and concentrate chloride ions to form a high-concentration chloride ion local area and generate hypochlorous acid. On the other hand, a flocculation electrode generates divalent and trivalent iron ions under the action of the electric field. Meanwhile, a cathode with catalytic activity generates hydrogen peroxide under the action of the electric field and aeration. Hypochlorous acid, hydrogen peroxide and iron ions form a synergistic effect to generate a Fenton reaction, and organic matter in the wastewater is removed under the action of the generated hydroxyl radicals and the electric field. Hypochlorous acid reacts with ammonia nitrogen in the wastewater to generate nitrogen gas, thereby removing ammonia nitrogen in the low-chlorine system. The removal effect of COD and ammonia nitrogen in the wastewater can be improved, carbon emission is small, and the device can also be applied to the treatment of high-salinity wastewater.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment, specifically relating to a treatment device and method for industrial wastewater with high COD, high ammonia nitrogen, and low chlorine. Background Technology

[0002] Industrial wastewater treatment is a crucial component of environmental protection and sustainable development. With the rapid development of industrial production, the discharge of large amounts of industrial wastewater has caused serious pollution to the water environment, impacting human health and ecological balance. Therefore, effective treatment of industrial wastewater to reduce pollution is a necessary measure for achieving green development and protecting water resources.

[0003] However, the treatment of some industrial wastewater presents significant challenges. For example, the pharmaceutical industry, compared to other industries, produces a wide variety of products and involves complex processes. Different products require different manufacturing processes, resulting in pharmaceutical wastewater that is highly concentrated organic wastewater, characterized by large volumes, high salinity, high color, and difficulty in degradation. Therefore, the discharge of pharmaceutical wastewater has a substantial impact on the surrounding environment.

[0004] With increasingly scarce water resources, we encourage pharmaceutical factories to reuse wastewater to conserve water. However, pharmaceutical wastewater often has high levels of COD and ammonia nitrogen. COD is a key indicator of organic pollution in water bodies, reflecting the degree of pollution; a lower COD value indicates fewer organic pollutants and better water quality. Ammonia nitrogen, on the other hand, is a nutrient in water bodies, contributing to eutrophication. It is a major oxygen-consuming pollutant and toxic to fish and certain aquatic organisms. Under certain conditions, ammonia nitrogen can be converted into nitrite. Long-term consumption of nitrite in water can lead to the formation of nitrosamines, a potent carcinogen that is extremely harmful to human health. Therefore, conventional water treatment for pharmaceutical industrial wastewater often fails to meet the standards for reuse, necessitating advanced treatment of industrial wastewater from industries like pharmaceutical manufacturing.

[0005] Currently, there are three main methods for treating industrial wastewater with high COD and high ammonia nitrogen, such as that from pharmaceutical factories: the traditional A / O process, the short-cut nitrification and denitrification process, and the traditional electrocatalytic oxidation process.

[0006] The traditional A / O process, a combination of anaerobic and aerobic processes, removes ammonia nitrogen from COD. In the anaerobic stage, denitrifying bacteria convert nitrate nitrogen into nitrogen gas with the help of a carbon source, simultaneously removing COD. In the aerobic stage, ammonia nitrogen is oxidized back to nitrate nitrogen, and biodegradable COD is removed from the effluent from the anaerobic stage. However, this method consumes a large amount of carbon source, and nitrifying bacteria are greatly affected by shock, making it unsuitable for treating high-salinity wastewater.

[0007] Short-cut nitrification and denitrification processes involve oxidizing ammonia nitrogen to nitrite nitrogen in the aerobic stage, followed by the reduction of nitrite nitrogen to nitrogen gas. This method omits the nitrate nitrogen step, thus saving carbon consumption and reducing carbon emissions. However, its operation is still not stable enough and it is not suitable for treating high-salinity wastewater.

[0008] Traditional electrocatalytic oxidation removes COD by generating hydroxyl radicals, hypochlorous acid, and intermediate products during anodic oxidation. However, removing ammonia nitrogen requires the participation of chloride ions. Chloride ions generate hypochlorite ions at the anode, which react with ammonia nitrogen to produce nitrogen gas, thus removing the ammonia nitrogen. Therefore, this method has extremely low ammonia nitrogen removal efficiency unless it is used for high-chlorine industrial wastewater.

[0009] In summary, existing methods for treating industrial wastewater from pharmaceutical plants and similar facilities with high COD, high ammonia nitrogen, and low chlorine levels have drawbacks such as high carbon emissions, inapplicability to high-salinity wastewater, and the removal efficiency of COD and ammonia nitrogen still needs further improvement. Summary of the Invention

[0010] The purpose of this invention is to solve the technical problems in the prior art of treating industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, which involve large carbon emissions and are not applicable to the treatment of high-salinity wastewater. Therefore, this invention provides a treatment device for industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, which can improve the removal efficiency of COD and ammonia nitrogen, has low carbon emissions, and is also applicable to the treatment of high-salinity wastewater.

[0011] To solve the above problems, the present invention is implemented according to the following technical solution:

[0012] This invention provides a treatment device for industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, the device comprising:

[0013] A reactor having a containment cavity in which an aeration pipe and several electrode assemblies are installed, the electrode assemblies including a porous anode, a catalytically active cathode, and a flocculation electrode;

[0014] An aeration blower, which is connected to the aeration pipe;

[0015] A DC power supply, wherein the positive terminal of the DC power supply is connected to the porous anode, and the negative terminal of the DC power supply is connected to the catalytically active cathode;

[0016] Wastewater enters the reactor through the inlet, and air is introduced into the reactor through the aeration pipe by the aeration blower. Under the action of aeration and electrolysis, the COD value and ammonia nitrogen content in the wastewater are reduced.

[0017] In a preferred embodiment, the reactor is also provided with a water outlet, a sludge discharge outlet, an exhaust outlet, and a safety valve.

[0018] In a preferred embodiment, the porous anode is a platinum-modified carbon nanotube electrode.

[0019] In a preferred embodiment, the catalytically active cathode is a nickel foam or copper-modified electrode.

[0020] In a preferred embodiment, the flocculation electrode is an iron plate electrode.

[0021] In a preferred embodiment, the electrode spacing between the plurality of electrode assemblies is equal, and the electrode spacing ranges from 5 to 15 mm.

[0022] In a preferred embodiment, the aeration blower is a low-pressure blower.

[0023] In a preferred embodiment, the accommodating cavity also includes an electrode holder for fixing the electrode assembly.

[0024] In a preferred embodiment, the electrode holder is made of either UPVC or PP.

[0025] This invention also provides a method for treating high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater, implemented using the aforementioned treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater. The method includes the following steps:

[0026] (1) Wastewater is introduced into the reactor through the inlet. Under the action of an electric field, the porous anode adsorbs chloride ions from the wastewater, thereby forming a high-concentration chloride ion aggregation region near the porous anode and generating hypochlorous acid. Fe is generated near the flocculation electrode. 2+ and Fe 3+ The hypochlorous acid reacts with the ammonia nitrogen in the wastewater to reduce the ammonia nitrogen content in the wastewater;

[0027] (2) Air is introduced into the reactor by an aeration blower, and hydrogen peroxide is generated near the catalytically active cathode under the action of electric field and aeration.

[0028] (3) The Fe 2+ It undergoes a Fenton reaction with the hydrogen peroxide to generate hydroxyl radicals;

[0029] (4) Under the action of an electric field, the hydroxyl radicals react with the organic matter in the wastewater to reduce the COD value of the wastewater;

[0030] (5) The wastewater treated in steps (1)-(4) is discharged from the outlet of the reactor.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention provides a treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater. This device implements a method for treating such wastewater. Utilizing an electric field, on one hand, a porous anode adsorbs and concentrates chloride ions, forming a localized region with high chloride ion concentration, and generates hypochlorous acid. On the other hand, a flocculation electrode generates divalent and trivalent iron ions under the influence of the electric field. Simultaneously, a catalytically active cathode generates hydrogen peroxide under the influence of the electric field and aeration. Hypochlorous acid, hydrogen peroxide, and iron ions form a synergistic effect, undergoing a Fenton reaction. Under the influence of hydroxyl radicals generated by oxidation and the electric field, organic matter in the wastewater is removed. Hypochlorous acid reacts with ammonia nitrogen in the wastewater to generate nitrogen gas, thereby removing ammonia nitrogen from the low-chlorine system.

[0033] Therefore, the treatment apparatus and method for high COD, high ammonia nitrogen, and low chlorine industrial wastewater of the present invention can improve the removal efficiency of COD and ammonia nitrogen in wastewater, with low carbon emissions, and can also be applied to the treatment of high salinity wastewater.

[0034] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 This is a structural diagram of a treatment device for high COD, high ammonia nitrogen, and low chlorine industrial wastewater according to the present invention.

[0037] In the picture:

[0038] 1-Aeration blower, 2-Aeration pipe, 3-Inlet, 4-Safety valve, 5-Outlet, 6-DC power supply, 7-Sludge discharge port, 8-Reactor, 9-Exhaust port, 11-Porous anode, 12-Cathode with catalytic activity, 13-Flocculation electrode, 14-Electrode holder. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0040] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] Industrial wastewater treatment is an important part of environmental protection and sustainable development. However, the treatment of some industrial wastewater is quite challenging. Industries such as pharmaceutical manufacturing, compared to other industries, produce a wide variety of products and involve complex processes. Different products have different production processes, resulting in wastewater from pharmaceutical plants being high-concentration organic wastewater that is difficult to degrade, characterized by large volumes, high salinity, high color, and poor biodegradability.

[0042] Currently, there are three main methods for treating industrial wastewater with high COD and high ammonia nitrogen levels, such as that from pharmaceutical plants: the traditional A / O process, short-cut nitrification and denitrification, and the traditional electrocatalytic oxidation. However, these three methods have drawbacks, including high carbon emissions and unsuitability for treating high-salinity wastewater; their treatment effectiveness needs further improvement.

[0043] Therefore, addressing the technical problems of existing technologies in treating industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, which involve large carbon emissions and are unsuitable for treating high-salinity wastewater, this invention provides a treatment device for industrial wastewater with high COD, high ammonia nitrogen, and low chlorine. This device improves the removal efficiency of COD and ammonia nitrogen while minimizing carbon emissions and is also suitable for treating high-salinity wastewater. It offers significant economic, social, and environmental benefits and has promising application prospects.

[0044] Specifically, the present invention provides a treatment device for high COD, high ammonia nitrogen, and low chlorine industrial wastewater, comprising: a reactor 8, an aeration blower 1, and a DC power supply 6.

[0045] In this embodiment, reactor 8 has a containment cavity, within which aeration pipe 2 and several electrode assemblies are installed. The electrode assemblies include a porous anode 11, a catalytically active cathode 12, and a flocculation electrode 13. Specifically, an aeration blower 1 is connected to the aeration pipe 2, the positive terminal of a DC power supply 6 is connected to the porous anode 11, and the negative terminal of the DC power supply 6 is connected to the catalytically active cathode 12. Wastewater enters reactor 8 through inlet 3, and air is introduced into reactor 8 through aeration pipe 2 by the aeration blower 1. Through aeration and electrolysis, the COD value and ammonia nitrogen content in the wastewater are reduced.

[0046] Preferably, the reactor 8 is also equipped with an outlet 5, a sludge discharge port 7, an exhaust port 9, and a safety valve 4. The outlet 5 is used to discharge the treated wastewater from the reactor 8. The main function of the safety valve 4 is to automatically release pressure when the pressure in the reactor 8 exceeds its maximum withstand pressure during wastewater treatment, preventing damage or explosion to the reactor 8; when the pressure in the reactor 8 rises abnormally due to malfunction or other reasons, the safety valve 4 will open, releasing some fluid, thereby protecting the entire reactor 8 from pressure damage. The exhaust port 9 is used to release gas from the reactor 8 and also prevents gas from forming airlocks in the reactor 8, affecting the normal flow of water and treatment efficiency. The sludge discharge port 7 is used to coagulate and precipitate suspended solids and colloidal particles generated during wastewater treatment and discharge them from the reactor 8.

[0047] It should be noted that the porous anode 11 has a porous structure, which increases the active surface area and provides more active sites for electrochemical reactions. The porous structure provides more channels, facilitating rapid ion transport within the electrode material and reducing resistance during battery charging and discharging. The porous structure also improves the structural stability of the material, especially when operating at high current densities. The porous anode 11 with its porous structure allows the electrolyte to penetrate deeper into the electrode material, thereby improving electrode wettability and the efficiency of the electrochemical reaction. In this invention, the porous structure of the porous anode 11 provides more adsorption sites and faster transport channels for ions, enabling it to adsorb and concentrate chloride ions under the influence of an electric field, forming a high-concentration chloride ion local region and generating hypochlorous acid.

[0048] It should be noted that a catalytically active cathode 12 means that, in the electrochemical reaction, the cathode material itself or through the addition of a catalyst can accelerate the electrochemical reaction rate on the electrode surface and improve the reaction efficiency. This catalytic activity can be an inherent property of the material or obtained through special treatment or the addition of a catalyst. This catalytically active cathode 12 has many advantages. On the one hand, it can increase the reaction rate because it can lower the activation energy of the electrochemical reaction, thus accelerating the reaction rate. Even under low-temperature conditions, the catalytically active cathode 12 can increase the rate of the electrochemical reaction, improving the low-temperature performance of the battery or electrochemical device. On the other hand, through catalysis, the energy conversion efficiency of the electrochemical reaction can be improved, reducing energy loss. Furthermore, the catalytically active cathode 12 can also reduce side reactions and structural degradation of the electrode material, extending the cycle life of the electrochemical device. Additionally, the catalytically active cathode 12 can promote the oxygen reduction reaction, improving the performance and efficiency of the fuel cell. In this invention, during wastewater treatment, the catalytically active cathode 12 can produce hydrogen peroxide under electrolysis. Under aeration conditions, aeration increases the concentration of dissolved oxygen in the water, providing more oxygen molecules to participate in the reaction, thereby increasing the generation rate of hydrogen peroxide, which can then be used to participate in the degradation process of pollutants in wastewater treatment.

[0049] It should be noted that the flocculation electrode 13 can generate flocculants through electrolysis, causing suspended solids and colloidal particles in the water to coagulate and precipitate, thereby achieving water purification. These precipitates are discharged through the sludge discharge port 7 in the reactor 8. The flocculation electrode 13 has many advantages. First, the electroflocculation agent of the flocculation electrode 13 undergoes oxidative electrolysis under the action of current from the sacrificial anode, generating metal hydroxides in situ without introducing other exogenous substances, thus reducing water body interference. Second, the flocculation electrode 13 can effectively remove pollutants such as suspended solids, organic matter, and heavy metals from the water under electrolysis, exhibiting high removal efficiency. Third, as a physical method, electrocoagulation technology does not produce secondary pollution and is environmentally friendly. Fourth, the treatment effect of the flocculation electrode 13 can be optimized by adjusting parameters such as electrolysis voltage, current density, electrode spacing, and electrolysis time. In this invention, the electrode material of the flocculation electrode 13 undergoes a redox reaction under the action of an electric field. This process generates ferrous and ferric ions, which not only improve wastewater treatment efficiency but also enhance pollutant removal due to their multiple roles in flocculation. Furthermore, the strong oxidizing properties of ferric ions can degrade certain recalcitrant organic pollutants to some extent. Ferrous ions can also subsequently undergo a Fenton reaction with hydrogen peroxide to generate hydroxyl radicals. Hydroxyl radicals are strong oxidants that can non-selectively oxidize various organic pollutants in wastewater, thereby reducing the COD value.

[0050] Preferably, the porous anode 11 is a platinum-modified carbon nanotube electrode. The platinum-modified carbon nanotube electrode combines the high catalytic activity of platinum with the unique properties of carbon nanotubes, enabling it to promote various electrochemical reactions, enhance electrochemical performance, exhibit high specific surface area, and provide good electronic conductivity. The platinum-modified carbon nanotube electrode also demonstrates good long-term stability and repeatability, and exhibits a low degradation rate during long-term use, helping to maintain its performance and extend its service life. Compared to some other catalysts, the platinum-modified carbon nanotube electrode offers better environmental compatibility and sustainability.

[0051] Preferably, the catalytically active cathode 12 is a nickel foam or copper-modified electrode. Nickel foam electrodes have a unique three-dimensional porous structure, which increases the contact area between the electrode and the electrolyte, thus improving the efficiency of the electrochemical reaction. Both nickel foam and copper-modified electrodes possess excellent electrical and thermal conductivity, contributing to improved electrode response speed and operational stability, and are more environmentally friendly and economical compared to other electrode materials.

[0052] Preferably, the flocculation electrode 13 is an iron plate electrode. Under the action of an electric field, a redox reaction will occur, producing ferrous ions (Fe2+). 2+ ) and ferric ions (Fe 3+ These ferric ions not only improve wastewater treatment efficiency but also enhance pollutant removal due to their multiple roles in the flocculation process. Furthermore, the strong oxidizing properties of ferric ions can degrade certain recalcitrant organic pollutants to some extent. Ferric ions can also undergo a Fenton reaction with hydrogen peroxide generated at the cathode to produce hydroxyl radicals. Hydroxyl radicals are strong oxidants that can non-selectively oxidize various organic pollutants in wastewater, thereby reducing the COD value.

[0053] In a preferred embodiment, the electrode spacing between several electrode components is equal, ranging from 5 to 15 mm. If the electrode spacing is too small, it can easily cause short circuits between the electrodes; while if the electrode spacing is too large, there will be too few local reaction points, which will affect the removal of COD and ammonia nitrogen.

[0054] Preferably, the aeration blower 1 is a low-pressure blower. Low-pressure blowers have lower energy consumption, typically only one-third or even less than that of traditional compressors, effectively saving energy and reducing operating costs. Low-pressure blowers can be easily installed on equipment structures without occupying much space, making them convenient for placement in wastewater treatment facilities. They also allow for easy daily maintenance and upkeep, reducing maintenance costs and time.

[0055] Preferably, the reactor 8 also has an electrode holder 14 in its accommodating cavity, which is used to fix the electrode assembly.

[0056] In a preferred embodiment, the electrode holder 14 is made of either UPVC or PP. Both UPVC and PP are highly corrosion-resistant, exhibiting good resistance to most acids, alkalis, and salts, making them suitable for use in chemical and wastewater treatment equipment (such as the reactor 8 described in this invention). Furthermore, UPVC and PP are lightweight, facilitating transportation and installation, and are relatively inexpensive, making them economical and practical materials.

[0057] This invention also provides a method for treating high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater, implemented using the aforementioned treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater. The method includes the following steps:

[0058] (1) Wastewater is introduced into reactor 8 through inlet 3. Under the action of an electric field, the porous anode 11 adsorbs chloride ions in the wastewater, thereby forming a high-concentration chloride ion aggregation area near the porous anode 11 and generating hypochlorous acid. Fe is generated near the flocculation electrode 13. 2+ and Fe 3+ Hypochlorous acid reacts with ammonia nitrogen in wastewater to reduce the ammonia nitrogen content in the wastewater.

[0059] (2) Air is introduced into reactor 8 through aeration blower 1. Under the action of electric field and aeration, hydrogen peroxide is generated near cathode 12 which has catalytic activity.

[0060] (3)Fe 2+ It undergoes a Fenton reaction with hydrogen peroxide to generate hydroxyl radicals.

[0061] (4) Under the action of an electric field, hydroxyl radicals react with organic matter in wastewater to reduce the COD value of wastewater.

[0062] (5) The wastewater treated in steps (1)-(4) is discharged from the outlet 5 of reactor 8.

[0063] In summary, this invention provides a treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater. This device enables a treatment method for such wastewater by utilizing an electric field. On one hand, the porous anode 11 adsorbs and concentrates chloride ions, forming a high-concentration chloride ion localized region and generating hypochlorous acid. On the other hand, the flocculation electrode 13 generates divalent and trivalent iron ions under the influence of the electric field. Simultaneously, hydrogen peroxide is generated through the catalytically active cathode 12 under the influence of the electric field and aeration. Hypochlorous acid, hydrogen peroxide, and iron ions form a synergistic effect, undergoing a Fenton reaction. Under the influence of hydroxyl radicals generated by oxidation and the electric field, organic matter in the wastewater is removed. Hypochlorous acid reacts with ammonia nitrogen in the wastewater to generate nitrogen gas, thereby removing ammonia nitrogen from the low-chlorine system.

[0064] Therefore, the treatment apparatus and method for high COD, high ammonia nitrogen, and low chlorine industrial wastewater of the present invention can improve the removal efficiency of COD and ammonia nitrogen in wastewater, with low carbon emissions, and can also be applied to the treatment of high salinity wastewater.

[0065] In one specific embodiment, a waste acid treatment center produces ferric phosphate from waste phosphorus and sulfuric acid, resulting in industrial wastewater that includes washing water and mother liquor. The washing water quality data for a 10,000 m³ / d flow rate is as follows: influent pH 2.3, total phosphorus 200 mg / L, TDS 20,000 mg / L, ammonia nitrogen 50 mg / L, COD 500 mg / L, and chloride ion ≤10 mg / L. The mother liquor quality data for a 2,400 m³ / d flow rate is as follows: influent pH 2, total phosphorus 1,000 mg / L, TDS 150,000 mg / L, ammonia nitrogen 20 mg / L, COD 500 mg / L, and chloride ion ≤10 mg / L.

[0066] After treatment by the high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater treatment device and method described in this invention, the COD removal rate in the washing water and mother liquor is 70%, and the ammonia-nitrogen removal rate reaches 65%, meeting the requirements for subsequent treatment.

[0067] Other technologies of the treatment device for high COD, high ammonia nitrogen, and low chlorine industrial wastewater described in this embodiment are found in the prior art.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A treatment device for industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, characterized in that, The device includes: The reactor has a containment cavity in which an aeration pipe and several electrode assemblies are installed. The electrode assemblies include a porous anode, a catalytically active cathode, and a flocculation electrode. The porous anode is a platinum-modified carbon nanotube electrode, the catalytically active cathode is a nickel foam or copper-modified electrode, and the flocculation electrode is an iron plate electrode. An aeration blower, which is connected to the aeration pipe; A DC power supply, wherein the positive terminal of the DC power supply is connected to the porous anode, and the negative terminal of the DC power supply is connected to the catalytically active cathode; The porous anode is used to adsorb chloride ions in the wastewater under the action of an electric field, so as to form a high-concentration chloride ion aggregation region near the porous anode and generate hypochlorous acid; the flocculation electrode is used to generate Fe under the action of an electric field. 2+ and Fe 3+ Fe 2+ The wastewater undergoes a Fenton reaction with hydrogen peroxide to generate hydroxyl radicals. The wastewater enters the reactor through the inlet, and the aeration blower introduces air into the reactor through the aeration pipe. Under the action of aeration and electrolysis, the catalytically active cathode generates hydrogen peroxide in its vicinity, thereby reducing the COD value and ammonia nitrogen content in the wastewater.

2. The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to claim 1, characterized in that: The reactor is also equipped with a water outlet, a sludge discharge outlet, an exhaust outlet, and a safety valve.

3. The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to claim 1, characterized in that: The electrode spacing between several of the electrode components is equal, and the electrode spacing ranges from 5 to 15 mm.

4. The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to claim 1, characterized in that: The aeration blower is a low-pressure blower.

5. The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to claim 1, characterized in that: The accommodating cavity also has an electrode holder for fixing the electrode assembly.

6. The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to claim 5, characterized in that: The electrode holder is made of either UPVC or PP.

7. A method for treating industrial wastewater with high COD, high ammonia nitrogen, and low chlorine, characterized in that, The treatment device for high-COD, high-ammonia-nitrogen, and low-chlorine industrial wastewater according to any one of claims 1-6 is used, and the method includes the following steps: (1) Wastewater is introduced into the reactor through the inlet. Under the action of an electric field, the porous anode adsorbs chloride ions in the wastewater, thereby forming a high-concentration chloride ion aggregation area near the porous anode and generating hypochlorous acid. Fe is generated near the flocculation electrode. 2+ and Fe 3+ The hypochlorous acid reacts with the ammonia nitrogen in the wastewater to reduce the ammonia nitrogen content in the wastewater; (2) Air is introduced into the reactor by an aeration blower, and hydrogen peroxide is generated near the catalytically active cathode under the action of electric field and aeration. (3) The Fe 2+ It undergoes a Fenton reaction with the hydrogen peroxide to generate hydroxyl radicals; (4) Under the action of an electric field, the hydroxyl radicals react with the organic matter in the wastewater to reduce the COD value of the wastewater; (5) The wastewater treated in steps (1)-(4) is discharged from the outlet of the reactor.

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