Series electrocatalytic device and method for treating high-nitrogen industrial wastewater

Abstract

The application discloses a series electric catalytic device and method for treating high-nitrate industrial wastewater, and belongs to the technical field of sewage treatment equipment. The device comprises a reactor device box, a single-chamber electric catalytic component, a multi-chamber electric catalytic component, a microporous aeration device, a universal moving frame and a waste gas treatment system. The single-chamber electric catalytic component comprises anode plates and cathode plates arranged at intervals, and a particle electrode component filled between the anode plates and the cathode plates; the multi-chamber electric catalytic component is internally provided with anode plates, cathode plates and diaphragm components. The application can efficiently remove carbon in the single-chamber component through adsorption and electric catalysis, and then the multi-chamber component is connected, the film and nitrogen atmosphere are introduced, and effective degradation of nitrate is realized. Meanwhile, the series device has the functions of collecting waste gas and removing scale, can realize multi-site and automatic operation, has high treatment efficiency and low operation energy consumption, and has important significance in the treatment of high-nitrate industrial wastewater.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to a series electrocatalytic device and method for treating high-nitrogen industrial wastewater. Background Art

[0002] With the progress of commerce, industry and agriculture, the types and contents of pollutants in various water bodies such as sewage from industrial production, domestic sewage and drinking water sources are constantly increasing. In order to achieve the goal of sewage discharge meeting standards, it is often necessary to coordinate the removal of various pollutants such as organic matter, nitrogen, phosphorus, heavy metals, bacteria, etc.

[0003] As industrial production continues to expand, the amount of wastewater generated by industrial production is also increasing. Most industrial production involves nitrate pollution. For example, industries such as machinery manufacturing, papermaking, fertilizers, and electroplating use nitric acid or other nitrogen-containing organic matter in their production processes. These nitrogen-containing substances are ultimately converted into nitrate nitrogen through human or natural transformation. Nitrate nitrogen, through water pollution and circulation, directly or indirectly enters the human living environment or the bodies of plants and animals. Over time, this poses a significant safety hazard. Nitrate nitrogen is difficult to degrade and causes significant secondary pollution. Therefore, there is an urgent need to find an efficient and clean method to treat nitrate nitrogen wastewater.

[0004] With the widespread application of electrochemical technology in the field of sewage treatment, electrocatalysis has gradually become one of the important treatment methods that has attracted much attention. It uses the direct and indirect reduction effect of the electrode surface to react with the water. reaction, so that nitrate ions can undergo direct or indirect reduction reaction on the cathode surface, thereby degrading them into N2, In addition, the by-product ammonia nitrogen can be oxidized to N2 on the anode surface. Through the reduction and oxidation reactions on the electrode surface, It can be degraded into harmless substances, and this method has the advantages of high removal rate, thorough treatment, low cost and less risk of secondary pollution.

[0005] However, current electrocatalytic treatment of difficult-to-degrade high-nitrate industrial wastewater with nitrate-nitrogen concentrations of 1000-2000 mg / L often suffers from inconsistent carbon and nitrogen removal. In a single reactor, COD degradation is often complete, but nitrate-nitrogen degradation is nearly nonexistent. Furthermore, problems such as low current efficiency, high energy consumption, and short electrode material life persist. Therefore, achieving simultaneous and efficient synergistic removal of carbon and nitrogen while reducing operational energy consumption is key to the practical application of electrochemical technology in the treatment of high-nitrate industrial wastewater. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a single-chamber-multi-chamber series electrocatalytic device and method for treating difficult-to-degrade high-nitrate-nitrogen industrial wastewater with a nitrate-nitrogen concentration of 1000-2000 mg / L. This device can enhance the electrocatalytic treatment of difficult-to-degrade high-nitrate-nitrogen industrial wastewater while also providing online monitoring, automatic operation, and waste gas collection.

[0007] The specific technical solutions adopted in the present invention are as follows:

[0008] In a first aspect, the present invention provides a series electrocatalytic device for treating high-nitrogen industrial wastewater, comprising a reactor device box, a single-chamber electrocatalytic component, a compartment electrocatalytic component, a microporous aeration device, a universal movable frame, and an exhaust gas treatment system;

[0009] A universal movable frame is installed at the bottom of the reactor device box, and a single-chamber electrocatalytic component and a divided-chamber electrocatalytic component are installed inside; a water inlet is provided at the lower part of the head end of the single-chamber electrocatalytic component, a water exchange port connected to the divided-chamber electrocatalytic component is provided at the lower part of the tail end, and a water outlet is provided on the upper side of the tail end of the divided-chamber electrocatalytic component; both the single-chamber electrocatalytic component and the divided-chamber electrocatalytic component have an open box structure, microporous aeration devices for oxygen or nitrogen supply are evenly laid on the bottom, and a gas collection hood connected to the exhaust gas treatment system is provided above.

[0010] Along the direction of water flow, the single-chamber electrocatalytic assembly is evenly and alternately provided with a plurality of cathode plates and anode plates of the same number, the plate surfaces of the cathode plates and the anode plates are arranged perpendicular to the direction of water flow, and the particle electrode assembly is filled between adjacent cathode plates and anode plates and does not contact the cathode plates and the anode plates;

[0011] The interior of the compartmented electrocatalytic component is detachably provided with a diaphragm assembly with a plate surface perpendicular to the direction of water flow, and the top is detachably provided with a porous cover plate; the diaphragm assembly is used to hinder the transfer of target ions, and the diaphragm assembly divides the interior of the compartmented electrocatalytic component into relatively independent anode chambers and cathode chambers of the same volume in sequence along the direction of water flow, and the centers of the anode chamber and the cathode chamber are respectively provided with an anode plate and a cathode plate with a plate surface perpendicular to the direction of water flow.

[0012] Preferably, water pumps and valves are provided at the water inlet, water exchange port and water outlet.

[0013] Preferably, both sides of the diaphragm assembly are vertically sealed and slidably connected to the inner wall of the chambered electrocatalytic assembly, and the diaphragm assembly includes an ion exchange membrane, a rubber pad and a plexiglass plate; rubber pads are provided circumferentially on both sides of the ion exchange membrane, and a plexiglass plate is fixed to the outside of the rubber pad by bolts; a rubber pad is provided at the contact point between the porous cover plate and the top of the chambered electrocatalytic assembly.

[0014] Preferably, the microporous aeration device at the bottom of the anode chamber of the single-chamber electrocatalytic assembly and the compartmentalized electrocatalytic assembly is connected to the oxygen cylinder through an aeration pipe provided with an aeration pump, and the microporous aeration device at the bottom of the cathode chamber of the compartmentalized electrocatalytic assembly is connected to the nitrogen cylinder through an aeration pipe provided with an aeration pump.

[0015] Preferably, the particle electrode assembly includes an activated carbon particle electrode with a diameter of 10 to 100 μm, an insulating mesh bag and an insulating plastic basket; a number of the activated carbon particle electrodes are placed in the insulating mesh bag, and the insulating mesh bag is fixed between the cathode plate and the anode plate through the insulating plastic basket.

[0016] Preferably, the anode plate material in the single-chamber electrocatalytic component is titanium-plated lead dioxide, and the cathode plate material is stainless steel, copper or nickel; the anode plate material in the compartment electrocatalytic component is titanium-plated lead dioxide, and the cathode plate material is copper or nickel.

[0017] Preferably, the single-chamber electrocatalytic assembly and the divided-chamber electrocatalytic assembly are both made of organic glass, and the universal movable frame and the reactor device box are both made of stainless steel.

[0018] Preferably, it also includes a water quality monitoring system; the water quality monitoring system includes a sample collection component, a measuring component and a display; the sample collection component is used to collect water samples to be tested in the single-chamber electrocatalytic component and the divided-chamber electrocatalytic component; the measuring component includes a sensor for measuring water quality parameters in the single-chamber electrocatalytic component and the divided-chamber electrocatalytic component, and can display the measured data on the display.

[0019] Preferably, an automatic setting system is also included; the automatic setting system is used to set the operating cycle of the series treatment of the single-chamber electrocatalytic component and the compartment electrocatalytic component according to the water sample parameters through an integrated controller, a timer and an execution unit to achieve automatic control.

[0020] In a second aspect, the present invention provides a method for treating high-nitrogen industrial wastewater using any of the series-connected electrocatalytic devices described in the first aspect, as follows:

[0021] The high-nitrate industrial wastewater to be treated is introduced into the single-chamber electro-catalysis assembly from the water inlet end, and after the wastewater reaches the limiting line from bottom to top, the water inlet end is closed; according to the water quality of the wastewater to be treated, the types and the number of the cathode plates and the anode plates in the single-chamber electro-catalysis assembly and the number of the particle electrode assemblies placed are controlled; after the wastewater enters the single-chamber electro-catalysis assembly, the microporous aeration device at the bottom is opened to supply oxygen to the inside of the single-chamber electro-catalysis assembly; at the same time, in addition to the traditional two-dimensional electrode system formed by the adjacent cathode plates and anode plates, the particle electrode assemblies form the particle electrodes with charged surfaces under the action of the applied electric field, becoming new poles, and the particle electrodes are equivalent to a plurality of micro-electrolytic cells, so that the pollutants can be oxidized and degraded on the surfaces of the particle electrodes, the reaction area of the system is increased, and a three-dimensional electrode system is formed in the single-chamber electro-catalysis assembly; the organic matter in the wastewater is effectively degraded in the three-dimensional electrode system, and the COD index is ensured to reach the standard;

[0022] The wastewater treated by the single-chamber electro-catalysis assembly and reaching the standard is introduced into the multi-chamber electro-catalysis assembly through the water exchange port, and during the water inlet process, the diaphragm assembly is suspended; after the water inlet is completed, the diaphragm assembly is placed, and the water exchange port is closed, and the porous cover plate at the top is covered; after the wastewater enters the multi-chamber electro-catalysis assembly, the microporous aeration device at the bottom is opened to supply oxygen to the inside of the anode chamber and nitrogen to the inside of the cathode chamber; during the treatment process, the ion exchange membrane of the diaphragm assembly can hinder the transfer of the intermediate nitrite from the cathode chamber to the anode chamber, so as to prevent the re-oxidation of the nitrite into nitrate, avoid the reduction of the current efficiency, realize the degradation of the nitrate nitrogen, and reduce the operation energy consumption.

[0023] During the treatment processes of the single-chamber electro-catalysis assembly and the multi-chamber electro-catalysis assembly, the gas collecting cover absorbs the waste gas generated in the reaction process by means of negative pressure suction vacuum, and the absorbed gas is uniformly treated in the waste gas treatment system, so as to avoid the pollution of air and the occurrence of explosion.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] 1) The device is internally provided with a single-chamber electro-catalysis assembly and a multi-chamber electro-catalysis assembly in series, solving the problem that the removal of carbon and nitrogen is not unified in the process of treating the refractory high-nitrate industrial wastewater by the electro-catalysis method at the present stage. The device can effectively solve the problem of nitrate nitrogen while realizing the standard of COD.

[0026] 2) The particle electrode assembly is added to the traditional two-dimensional electrode in the single-chamber electro-catalysis assembly, so that the mass transfer rate in the electro-catalysis process is faster, the current efficiency is higher, the organic matter can be degraded in a shorter time under the same current density, and the operation energy consumption is greatly reduced; the cathode of the multi-chamber electro-catalysis assembly is a commercial copper or nickel, and a new type of cathode material does not need to be prepared, the assembly is simple and easy to operate, and the economic cost is low.

[0027] 3) The device is safe to operate, and is internally provided with a gas collecting hood and a waste gas treatment system. The gas collecting hood absorbs the chlorine and hydrogen generated during the reaction process by negative pressure suction vacuum, and the absorbed waste gas is uniformly treated in the waste gas treatment system, thereby avoiding the occurrence of explosion during the electro-catalysis process.

[0028] 4) The device is provided with a water quality monitoring system and an automatic setting system, and the water quality is monitored online, and the operation period of the single-chamber electro-catalysis assembly and the sub-chamber electro-catalysis assembly in series treatment is automatically set according to the treatment effect, so that the visualization is high and the degree of automation is high.

[0029] 5) The device is provided with a universal moving frame, and the universal moving wheel is a heavy type nylon wheel, so that the movement and fixation of the reactor device box can be realized, and thus integrated sewage treatment is realized: through reasonable process design and optimized treatment unit configuration, organic matter and nutrients in sewage can be efficiently removed; various treatment assemblies are compactly integrated in one device, so that the floor area of the device is greatly reduced; due to the compact design of the device, the construction and maintenance process are more simple, and the related cost is reduced; the integrated sewage treatment device can be modularly combined according to actual needs, and can be suitable for sewage treatment places of different scales and treatment requirements. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a top view of the reactor;

[0031] Figure 2 is a structural schematic view of the device of the present application;

[0032] Figure 3 is a structural schematic view of the diaphragm assembly from different perspectives;

[0033] In the above figures, 1 is a reactor device box, 2 is a single-chamber electro-catalysis assembly, 3 is a sub-chamber electro-catalysis assembly, 4 is a cathode plate, 5 is an anode plate, 6 is a particle electrode assembly, 7 is a cathode chamber, 8 is an anode chamber, 9 is a microporous aeration device, 10 is an aeration pipe, 11 is an aeration pump, 12 is a water inlet end, 13 is a water outlet end, 14 is a water replacement port, 15 is a universal moving frame, 16 is a diaphragm assembly, 17 is a gas collecting hood, 18 is a waste gas treatment system, 19 is a water quality monitoring system, 20 is an automatic setting system, 21 is an ion exchange membrane, 22 is a rubber pad, 23 is an organic glass plate, and 24 is a bolt. DETAILED DESCRIPTION

[0034] The present application will be further described and explained in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment in the present application can be combined accordingly without conflict.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0036] like Figure 1 and 2 As shown, a series electrocatalytic device provided by the present invention is used to treat high nitrate nitrogen (nitrate nitrogen concentration is 1000-2000 mg / L) industrial wastewater. The series electrocatalytic device mainly includes a reactor device box 1, a single-chamber electrocatalytic component 2, a compartment electrocatalytic component 3, a microporous aeration device 9, a universal movable frame 15 and an exhaust gas treatment system 18.

[0037] The structure and connection method of each component will be described in detail below.

[0038] In the present invention, a universal movable frame 15 is installed at the bottom of the reactor device box 1, and a single-chamber electrocatalytic assembly 2 and a compartment electrocatalytic assembly 3 are installed inside. A water inlet 12 is provided at the lower portion of the head end of the single-chamber electrocatalytic assembly 2, and a water exchange port 14 is provided at the lower portion of the tail end, which is connected to the compartment electrocatalytic assembly 3. A water outlet 13 is provided at the upper side of the tail end of the compartment electrocatalytic assembly 3. Both the single-chamber electrocatalytic assembly 2 and the compartment electrocatalytic assembly 3 are open box structures, and microporous aeration devices 9 for oxygen or nitrogen supply are evenly laid on the bottom of each, and a gas collection hood 17 connected to the exhaust gas treatment system 18 is provided above each.

[0039] As a preferred embodiment of the present invention, in order to better control the water inlet and outlet of the single-chamber electrocatalytic component 2 and the divided-chamber electrocatalytic component 3, water pumps and valves are provided at the water inlet 12, the water exchange port 14 and the water outlet 13.

[0040] In a preferred embodiment of the present invention, universal movable frame 15 is made of stainless steel to prevent rust on the device housing and extend its service life. Heavy-duty nylon wheels are installed at the bottom of universal movable frame 15 to facilitate both movement and fixation of the device. To prevent rust, reactor housing 1 and universal movable frame 15 are both made of stainless steel. To prevent dangerous situations such as electrical leakage in the reactor, single-chamber electrocatalytic assembly 3 and divided-chamber electrocatalytic assembly 4 are made of organic glass. The thickness of the stainless steel and organic glass should be appropriately selected based on the actual operating water volume.

[0041] As a preferred embodiment of the present invention, the microporous aeration device 9 at the bottom of the anode chamber 8 of the single-chamber electrocatalytic assembly 2 and the divided-chamber electrocatalytic assembly 3 is connected to an oxygen cylinder via an aeration tube 10 equipped with an aeration pump 11. The microporous aeration device 9 at the bottom of the cathode chamber 7 of the divided-chamber electrocatalytic assembly 3 is connected to a nitrogen cylinder via an aeration tube 10 equipped with an aeration pump 11. The aeration holes of the microporous aeration device 9 are evenly distributed at the bottom of the single-chamber electrocatalytic assembly 2 and the divided-chamber electrocatalytic assembly 3, and the aeration volume and frequency can be adjusted according to actual conditions.

[0042] In actual application, after the reactor (i.e., the single-chamber electrocatalytic component 2 and the compartment electrocatalytic component 3) is energized, chlorine and hydrogen will be generated inside the reactor due to the electrochemical reaction. A gas collecting hood is arranged above the reactor to absorb the waste gas generated during the reaction by negative pressure vacuum suction. The absorbed gas is uniformly treated in the waste gas treatment system 18 to avoid air pollution and explosion. When in use, the gas collecting hood 17 is rotated to the top of the reactor and the switch is turned on. When not in use, it is rotated to the side of the reactor and the switch is turned off.

[0043] In the present invention, along the direction of water flow, multiple cathode plates 4 and anode plates 5 of the same number are evenly spaced and alternately arranged in the single-chamber electrocatalytic component 2, and an adjacent cathode plate 4 and an adjacent anode plate 5 serve as a two-dimensional electrode system. Figure 2 As shown, the single-chamber electrocatalytic assembly 2 has three two-dimensional electrode systems. However, in actual use, the number of two-dimensional electrode systems can be adjusted based on actual conditions such as sewage quality. The cathode plates 4 and anode plates 5 are both positioned perpendicular to the direction of water flow. The particle electrode assembly 6 is placed between adjacent cathode plates 4 and anode plates 5 and does not contact either plate.

[0044] As a preferred embodiment of the present invention, a plurality of pairs of cathode plates 4 and anode plates 5 are spaced apart in a single-chamber electrocatalytic assembly, and are fixed by means of slots. The anode plate 5 in the single-chamber electrocatalytic assembly 2 is made of titanium-plated lead dioxide, and the cathode plate 4 is made of stainless steel, copper, or nickel. The particle electrode assembly 6 includes an activated carbon particle electrode with a diameter of 10 to 100 μm, an insulating mesh bag, and an insulating plastic basket. Multiple activated carbon particle electrodes are placed in the insulating mesh bag, which is fixed between the cathode plate 4 and the anode plate 5 by the insulating plastic basket and can be removed when not in use to prevent the particle electrodes from interfering with the contact with the cathode plate 4 and the anode plate 5.

[0045] In the present invention, a detachable diaphragm assembly 16, with its surface perpendicular to the direction of water flow, is installed inside the compartmented electrocatalytic assembly 3. A detachable porous cover is installed on the top. Diaphragm assembly 16 is used to block the transfer of target ions. Diaphragm assembly 16 divides the interior of the compartmented electrocatalytic assembly 3 into relatively independent anode chambers 8 and cathode chambers 7 of equal volume, along the direction of water flow. The centers of anode chambers 8 and cathode chambers 7 are respectively equipped with anode plates 5 and cathode plates 4, with their surfaces perpendicular to the direction of water flow.

[0046] As a preferred embodiment of the present invention, Figure 3 As shown, both sides of the diaphragm assembly 16 are vertically sealed and slidably connected to the inner side walls of the chambered electrocatalytic assembly 3. The diaphragm assembly 16 includes an ion exchange membrane 21, a rubber pad 22 and a plexiglass plate 23. Rubber pads 22 are provided on both sides of the ion exchange membrane 21, and the plexiglass plate 23 is fixed to the outside of the rubber pad 22 by bolts 24. When in use, the diaphragm assembly 16 is slid into the reactor through the slot with the rubber pad and fixed to achieve effective separation of the cathode chamber 7 and the anode chamber 8. After use, open the porous cover on the top, slide the diaphragm assembly out of the slot and clean it.

[0047] In a preferred embodiment of the present invention, the anode plate 5 in the compartmented electrocatalytic assembly 3 is made of titanium-plated lead dioxide, and the cathode plate 4 is made of copper or nickel. Before the reaction begins, the compartmented electrocatalytic assembly 3 needs to be covered with a cover plate with a vent. A rubber pad can be placed where the porous cover plate contacts the top of the compartmented electrocatalytic assembly 3 to effectively exhaust air from the cathode chamber 7 of the compartmented electrocatalytic assembly 3.

[0048] In actual use, wastewater enters the single-chamber electrocatalytic component 2 through the water inlet 12. After the single-chamber electrocatalytic setting treatment time is reached, the water exchange port 14 is opened to pump the wastewater into the compartment electrocatalytic component 3. The diaphragm component 16 is suspended during the water exchange phase and is lowered after the water inlet is completed, and the water exchange port 14 is closed. After the compartment electrocatalytic setting treatment time is reached, the treated water is discharged in compliance with the standards through the water outlet 13. In other words, wastewater flows in and out from each port through a water pump. It first flows into the single-chamber electrocatalytic component through the water inlet, and after the single-chamber electrocatalytic stage is set to end, it is pumped into the compartment electrocatalytic component through the water exchange port. After the compartment electrocatalytic stage is set to end, it is pumped out and discharged from the water outlet. During the reaction, the water inlet, water exchange port, and water outlet are all closed, so as to achieve effective retention and electrocatalytic treatment of wastewater in the single-chamber electrocatalytic component and the compartment electrocatalytic component.

[0049] As a preferred embodiment of the present invention, the series electrocatalytic device of the present invention further includes a water quality monitoring system 19. The water quality monitoring system 19 mainly includes a sample collection component, a measurement component, a data acquisition component and a display: the sample collection component is used to collect water samples to be tested; the measurement component includes sensors, which adopt various sensor technologies, such as optical sensors, electrochemical sensors, etc., to achieve multi-parameter monitoring, and are used to monitor various parameters in the water body, such as pH value, dissolved oxygen, turbidity, conductivity, temperature, etc.; the data acquisition component is used to receive the data collected by the sensor unit and convert it into a digital signal for processing; the data acquisition component uses an analog-to-digital converter, a signal amplifier, etc. to ensure accurate data collection, and displays the measured data in real time on the display to achieve visual and interactive display. The operator can use the interface to complete operations such as viewing real-time data, querying historical records, and setting alarm thresholds.

[0050] As a preferred embodiment of the present invention, the series electrocatalytic device of the present invention further includes an automatic setting system 20. The automatic setting system 20 is used to set the operating cycle of the series treatment of the single-chamber electrocatalytic component 2 and the divided-chamber electrocatalytic component 3, the frequency of water inlet and outlet, and the aeration volume and frequency based on water sample parameters through an integrated controller, timer, and execution unit. The automatic setting system reduces the risk of manual operation and improves the safety and reliability of operation. The automatic setting system can be customized and expanded according to the needs of different devices or systems to adapt to diverse application scenarios and setting requirements.

[0051] The series electrocatalytic device of the present invention can efficiently remove organic matter and nutrients from sewage through reasonable process design and optimized treatment unit configuration; the various treatment components are compactly integrated into one device, greatly reducing the equipment's footprint; due to the equipment's compact design, the construction and maintenance processes are simpler, reducing related costs; the integrated sewage treatment equipment can be modularly combined according to actual needs and can adapt to sewage treatment sites of different sizes and treatment requirements.

[0052] Based on the above-mentioned series electrocatalytic device, the present invention also provides a method for treating high-nitrogen industrial wastewater. The specific details of the wastewater treatment method are as follows:

[0053] The high-nitrogen industrial wastewater to be treated is introduced into the single-chamber electrocatalytic assembly 2 through the water inlet 12. Once the wastewater reaches the limit line, the water inlet 12 is closed. The type and number of cathode plates 4 and anode plates 5 in the single-chamber electrocatalytic assembly 2, as well as the number of particle electrode assemblies 6 placed, are controlled based on the quality of the wastewater to be treated. If the wastewater contains a high concentration of organic matter, all anode and cathode plates in the single-chamber electrocatalytic assembly can be activated, and particle electrode assemblies can be placed between the cathode and anode plates. If the nitric nitrogen content in the wastewater is high, the aeration frequency can be increased, extending the wastewater retention time.

[0054] After the wastewater enters the single-chamber electrocatalytic assembly 2, the microporous aeration device 9 at the bottom is activated to supply oxygen to the interior of the single-chamber electrocatalytic assembly 2. Simultaneously, in addition to the traditional two-dimensional electrode system formed by the adjacent cathode plate 4 and anode plate 5, the particle electrode assembly 6, under the action of an applied electric field, forms a new electrode with charged surface particles. These particles act as micro-electrolytic cells, allowing pollutants to be oxidized and degraded on their surfaces. This increases the reaction area of ​​the system and forms a three-dimensional electrode system within the single-chamber electrocatalytic assembly 2. Within this three-dimensional electrode system, organic matter in the wastewater is effectively degraded, ensuring that COD indicators meet standards.

[0055] Wastewater that has been treated and meets the standards by the single-chamber electrocatalytic component 2 enters the compartment electrocatalytic component 3 through the water exchange port 14. During the water intake process, the diaphragm component 16 is suspended. After the water intake is completed, the diaphragm component 16 is lowered, the water exchange port 14 is closed, and the porous cover plate on the top is covered. After the wastewater enters the compartment electrocatalytic component 3, the microporous aeration device 9 at the bottom is turned on to supply oxygen to the inside of the anode chamber 8 and to aerate the inside of the cathode chamber 7 with nitrogen. During the treatment process, the ion exchange membrane 21 of the diaphragm component 16 can hinder the transfer of the intermediate nitrite from the cathode chamber 7 to the anode chamber 8, thereby preventing the reoxidation of nitrite to nitrate, avoiding the reduction of current efficiency, achieving nitric nitrogen degradation, and reducing operating energy consumption.

[0056] During the treatment process of the single-chamber electrocatalytic component 2 and the divided-chamber electrocatalytic component 3, the gas collecting hood 17 absorbs the waste gas generated during the reaction process by means of negative pressure vacuum suction. The absorbed gas is uniformly treated in the waste gas treatment system 18 to avoid air pollution and explosion.

[0057] Through the water quality monitoring system and the automatic setting system, the operating cycle of the single-chamber electrocatalytic component and the divided-chamber electrocatalytic component series treatment can be automatically set according to the implemented water quality conditions.

[0058] This invention efficiently removes carbon within a single-chamber assembly through adsorption and electrocatalysis. Subsequent installation of a sub-chamber assembly allows for the effective degradation of nitrate nitrogen by introducing a membrane and nitrogen atmosphere. This cascaded device also collects waste gas and removes scale, enabling multi-site, automated operation with high treatment efficiency and low energy consumption, making it crucial for treating high-nitrate industrial wastewater.

[0059] The embodiment described above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent substitution or equivalent transformation falls within the scope of protection of the present invention.

Claims

1. A method for treating high nitrate nitrogen industrial wastewater, characterized in that: The details are as follows: The high-nitrogen industrial wastewater to be treated is introduced into the single-chamber electrocatalytic component (2) from the water inlet (12). After the wastewater flows from bottom to top to the limit line, the water inlet (12) is closed. According to the water quality of the wastewater to be treated, the type and number of cathode plates (4) and anode plates (5) in the single-chamber electrocatalytic component (2) and the number of particle electrode assemblies (6) placed are controlled. After the wastewater enters the single-chamber electrocatalytic component (2), the microporous aeration device (9) at the bottom is opened to supply oxygen to the inside of the single-chamber electrocatalytic component (2). At the same time, in addition to the traditional two-dimensional electrode system composed of adjacent cathode plates (4) and anode plates (5), the particle electrode assembly (6) forms a particle electrode with a charged surface under the action of an external electric field, becoming a new electrode. The particle electrode is equivalent to a micro-electrolytic cell, so that pollutants can be oxidized and degraded on its surface, increasing the reaction area of ​​the system and forming a three-dimensional electrode system in the single-chamber electrocatalytic component (2). The wastewater realizes effective degradation of organic matter in the three-dimensional electrode system, ensuring that the COD index meets the standard. Wastewater that has been treated by the single-chamber electrocatalytic component (2) and meets the standards enters the compartment electrocatalytic component (3) through the water exchange port (14). During the water inlet process, the diaphragm component (16) is suspended and placed. After the water inlet is completed, the diaphragm component (16) is lowered, the water exchange port (14) is closed, and the porous cover plate on the top is covered. After the wastewater enters the compartment electrocatalytic component (3), the microporous aeration device (9) at the bottom is opened to supply oxygen to the inside of the anode chamber (8) and aerate the inside of the cathode chamber (7) with nitrogen. During the treatment process, the ion exchange membrane (21) of the diaphragm component (16) can hinder the transfer of the intermediate nitrite from the cathode chamber (7) to the anode chamber (8), thereby preventing the nitrite from being reoxidized to nitrate, avoiding the reduction of current efficiency, achieving nitric nitrogen degradation, and reducing operating energy consumption. During the treatment process of the single-chamber electrocatalytic component (2) and the divided-chamber electrocatalytic component (3), the gas collecting hood (17) absorbs the waste gas generated during the reaction process by means of negative pressure vacuum suction. The absorbed gas is uniformly treated in the waste gas treatment system (18) to avoid air pollution and explosion.

2. The method for treating high nitrate nitrogen industrial wastewater according to claim 1, wherein: The method is realized based on a series electrocatalytic device; the series electrocatalytic device comprises a reactor device box (1), a single-chamber electrocatalytic component (2), a compartment electrocatalytic component (3), a microporous aeration device (9), a universal movable frame (15), and an exhaust gas treatment system (18); The reactor device box (1) is provided with a universal movable frame (15) at the bottom, and a single-chamber electrocatalytic component (2) and a compartment electrocatalytic component (3) are provided inside; a water inlet (12) is provided at the lower part of the head end of the single-chamber electrocatalytic component (2), a water exchange port (14) communicating with the compartment electrocatalytic component (3) is provided at the lower part of the tail end, and a water outlet (13) is provided at the upper side of the tail end of the compartment electrocatalytic component (3); the single-chamber electrocatalytic component (2) and the compartment electrocatalytic component (3) are both open box structures, microporous aeration devices (9) for oxygen supply or nitrogen aeration are evenly laid on the bottom, and a gas collecting hood (17) connected to the exhaust gas treatment system (18) is provided above. Along the direction of water flow, a plurality of cathode plates (4) and anode plates (5) of the same number are evenly spaced and alternately arranged in the single-chamber electrocatalytic component (2), the plate surfaces of the cathode plates (4) and the anode plates (5) are arranged perpendicular to the direction of water flow, and the particle electrode assembly (6) is filled between adjacent cathode plates (4) and anode plates (5) and does not contact the cathode plates (4) and the anode plates (5); The compartment electrocatalytic component (3) is internally provided with a detachable diaphragm component (16) whose plate surface is perpendicular to the water flow direction, and the top is detachably provided with a porous cover plate; the diaphragm component (16) is used to hinder the transfer of target ions, and the diaphragm component (16) sequentially separates the interior of the compartment electrocatalytic component (3) into relatively independent anode chambers (8) and cathode chambers (7) of the same volume along the water flow direction, and the centers of the anode chamber (8) and the cathode chamber (7) are respectively provided with an anode plate (5) and a cathode plate (4) whose plate surface is perpendicular to the water flow direction.

3. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The water inlet (12), the water exchange port (14) and the water outlet (13) are all provided with water pumps and valves.

4. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The two sides of the diaphragm assembly (16) are vertically sealed and slidably connected to the inner side walls of the compartment electrocatalytic assembly (3), and the diaphragm assembly (16) includes an ion exchange membrane (21), a rubber pad (22) and an organic glass plate (23); rubber pads (22) are provided on the circumference of both sides of the ion exchange membrane (21), and the organic glass plate (23) is fixed to the outside of the rubber pad (22) by bolts (24); a rubber pad is provided at the contact point between the porous cover plate and the top of the compartment electrocatalytic assembly (3).

5. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The microporous aeration device (9) at the bottom of the anode chamber (8) of the single-chamber electrocatalytic assembly (2) and the compartment electrocatalytic assembly (3) is connected to an oxygen cylinder via an aeration pipe (10) provided with an aeration pump (11), and the microporous aeration device (9) at the bottom of the cathode chamber (7) of the compartment electrocatalytic assembly (3) is connected to a nitrogen cylinder via an aeration pipe (10) provided with an aeration pump (11).

6. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The particle electrode assembly (6) comprises an activated carbon particle electrode with a diameter of 10 to 100 μm, an insulating mesh bag, and an insulating plastic basket; a plurality of the activated carbon particle electrodes are placed in the insulating mesh bag, and the insulating mesh bag is fixed between the cathode plate (4) and the anode plate (5) through the insulating plastic basket.

7. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The anode plate (5) in the single-chamber electrocatalytic component (2) is made of lead dioxide-plated titanium, and the cathode plate (4) is made of stainless steel, copper or nickel; the anode plate (5) in the compartment electrocatalytic component (3) is made of lead dioxide-plated titanium, and the cathode plate (4) is made of copper or nickel.

8. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: The single-chamber electrocatalytic component (2) and the divided-chamber electrocatalytic component (3) are both made of organic glass, and the universal movable frame (15) and the reactor device box (1) are both made of stainless steel.

9. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: It also includes a water quality monitoring system (19); the water quality monitoring system (19) includes a sample collection component, a measurement component and a display; the sample collection component is used to collect water samples to be tested in the single-chamber electrocatalytic component (2) and the divided-chamber electrocatalytic component (3); the measurement component includes a sensor for measuring water quality parameters in the single-chamber electrocatalytic component (2) and the divided-chamber electrocatalytic component (3), and can display the measured data on the display.

10. The method for treating high nitrate nitrogen industrial wastewater according to claim 2, wherein: It also includes an automatic setting system (20); the automatic setting system (20) is used to set the operation cycle of the series treatment of the single-chamber electrocatalytic component (2) and the divided-chamber electrocatalytic component (3) according to the water sample parameters through an integrated controller, a timer and an execution unit, thereby realizing automatic control.

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