Novel anaerobic electrolytic membrane biological reaction device

Abstract

The utility model discloses a novel anaerobic electrolysis membrane biological reaction device, which relates to the technical field of sewage treatment and comprises a sequencing batch reaction tank for sewage pretreatment and an anaerobic electrolysis membrane biological reaction tank, the anaerobic electrolysis membrane biological reaction tank comprises a tank body and an electrolysis device, the tank body is of a closed structure, and the electrolysis device is arranged in the tank body. An inner cavity of the tank body is divided into a biogas chamber and an anaerobic reaction chamber from top to bottom by a partition plate, a plurality of vent holes are formed in the partition plate, a molecular sieve is filled in the biogas chamber, a stirring device is arranged in the anaerobic reaction chamber, the electrolysis device comprises a power supply, a cathode and an anode, the cathode and the anode are arranged in the anaerobic reaction chamber, and the power supply is connected with the power supply. A biogas outlet and a water outlet are formed in the top end of the tank body, the water outlet is connected with the cathode through a pipeline, and the biogas outlet is connected with the biogas chamber. According to the utility model, high-concentration industrial wastewater which is difficult to degrade can be efficiently treated, meanwhile, energy consumption can be reduced, membrane pollution can be alleviated, and high-efficiency recycling of methane can be realized.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a novel anaerobic electrolytic membrane bioreactor. Background Technology

[0002] Landfill leachate is characterized by high pollution load, complex composition, poor biodegradability, and large fluctuations in water quality. Anaerobic electrolytic membrane bioreactor is a high-efficiency wastewater treatment system that integrates anaerobic biological treatment, electrochemical oxidation, and membrane separation technologies. It is especially suitable for high-concentration, recalcitrant industrial wastewater (such as landfill leachate). Its core lies in overcoming the limitations of traditional processes through the synergistic use of multiple technologies to achieve efficient removal of pollutants and resource utilization.

[0003] The principle is to use anaerobic microorganisms to decompose large organic molecules into smaller molecules and produce biogas, which reduces the load on electrochemical and membrane separation; at the same time, the membrane module is used to efficiently separate sludge and extend the microbial degradation time; and the electrochemical process is used to improve the biodegradability of wastewater and inhibit membrane fouling in situ. Through the synergistic effect of the three, efficient and low-consumption wastewater treatment is achieved.

[0004] Patent No. 201721396430.5 discloses a sludge reduction device for a microbial electrolysis cell coupled with an anaerobic membrane bioreactor. The device consists of a sludge feeding tank, an ultrasonic device, an ultrasonic + alkali pretreatment sludge tank, an alkali tank, a microbial electrolysis cell-anaerobic membrane bioreactor, an effluent tank, a constant voltage power supply, a gas collection bag, an anode carbon felt, a cathode membrane assembly, a stirrer, sludge pump a, a metering pump, sludge pump b, and a peristaltic pump. It features fast degradation rate of excess sludge, high methanogenesis, and reduced membrane fouling.

[0005] This patent shares the same principle as the anaerobic electrolysis membrane bioreactor in the background technology, and is suitable for high-concentration, recalcitrant industrial wastewater. However, it has some structural shortcomings: 1. The membrane module uses a titanium mesh with an internal hollow fiber ultrafiltration membrane module, which has limited antifouling capabilities. Although it can reduce membrane fouling to some extent under electrochemical action, its antifouling performance still needs improvement; 2. The produced methane is collected using a gas collection bag. Since the generated methane contains water vapor, it cannot be directly recycled and is only suitable for laboratory or small-scale applications. It is then dried by a drying device before reuse, making the process cumbersome and complex; 3. Ultrasonic irradiation is used in the pretreatment process to reduce membrane fouling to some extent. However, this method is not only energy-intensive but also has limited effect on reducing membrane fouling. Similar to the first shortcoming, it does not improve the antifouling performance of the membrane module from the source and needs improvement. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the above-mentioned technologies and provide a novel anaerobic electrolytic membrane bioreactor that can efficiently treat high-concentration, recalcitrant industrial wastewater while reducing energy consumption, mitigating membrane fouling, and achieving efficient methane reuse.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0008] A novel anaerobic electrolytic membrane bioreactor includes a sequencing batch reactor (SBR) for wastewater pretreatment and an anaerobic electrolytic membrane bioreactor tank. The anaerobic electrolytic membrane bioreactor tank comprises a tank body and an electrolysis device. The tank body is a closed structure, and a partition divides the internal cavity of the tank body into a biogas chamber and an anaerobic reaction chamber from top to bottom. The partition has several ventilation holes. The biogas chamber is filled with molecular sieves, and the anaerobic reaction chamber is equipped with a stirring device. The electrolysis device includes a power source, a cathode, and an anode, both of which are located within the anaerobic reaction chamber. A biogas outlet and a water outlet are located at the top of the tank body. The water outlet is connected to the cathode via a pipe, and the biogas outlet is connected to the biogas chamber.

[0009] A further improvement of this invention is that a sealed door is installed on one side of the biogas chamber for periodically replacing the molecular sieve inside the biogas chamber.

[0010] A further improvement of this invention is that the cathode is a membrane assembly.

[0011] A further improvement of this invention is that the membrane module is a PDA / g-C3N4 / PVDF modified flat sheet membrane coated with nickel foam. This flat sheet membrane has high antifouling properties and also has the characteristic of further degrading organic matter. At the same time, the nickel foam can enhance the mechanical strength of the flat sheet membrane, improve the antifouling ability and service life of the membrane module, and its three-dimensional porous structure can uniformly disperse pressure, reduce the risk of membrane damage. Its porous structure can also improve the flow state of wastewater on the membrane surface and reduce concentration polarization. Meanwhile, surface modification (such as grafting hydrophilic groups) can reduce membrane fouling and improve flux stability. In addition, nickel foam can also serve as a biofilm carrier, providing attachment sites for microorganisms and enhancing biodegradation capabilities.

[0012] A further improvement of this invention is that the anode is a carbon felt.

[0013] A further improvement of this invention is that the sequencing batch reactor includes a tank body, the inner cavity of which is sequentially divided into a decolorization zone, a coagulation aid zone, and a flocculation zone by a first partition wall and a second partition wall. The top of both the first and second partition walls is provided with an overflow port, and the overflow port of the second partition wall is lower than the overflow port of the first partition wall, so that the wastewater from the decolorization zone and the coagulation aid zone overflows from the top to the next water treatment zone. The flocculation zone is connected to the anaerobic reaction chamber by a water pump. Through a non-powered pretreatment method, the overflow effect is used to allow the wastewater to undergo decolorization treatment, coagulation aid treatment, and flocculation treatment in sequence, reducing energy consumption. It only requires the periodic addition of chemicals through a dosing device.

[0014] A further improvement of this invention is that a gas flow meter is connected to the biogas outlet to control the methane output.

[0015] A further improvement of this invention is that a liquid level detector is installed in the anaerobic reaction chamber to monitor the water level and prevent the water level from being too high and entering the upper biogas chamber.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention uses a PDA / g-C3N4 / PVDF modified flat sheet membrane coated with nickel foam as the cathode membrane module, which has high anti-fouling properties. At the same time, the nickel foam can also enhance the mechanical properties of the flat sheet membrane and reduce membrane fouling, thereby improving the anti-fouling properties of the membrane module from the source and reducing energy consumption.

[0018] This invention uses a molecular sieve to dehumidify methane gas, making the dehumidified methane easier to reuse. Furthermore, the molecular sieve is replaceable, allowing for easy replacement of the sieve within the methane chamber via a sealed door.

[0019] This utility model employs a sequencing batch reactor (SBR) for pretreatment, which can treat impurities in wastewater under low energy consumption conditions, ensuring efficient and stable operation of subsequent treatments and reducing membrane fouling. The SBR adopts a gradient overflow structure, eliminating the need for a power system, facilitating maintenance, and effectively reducing energy consumption and costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1. Sequencing batch reactor; 2. Anaerobic electrolytic membrane bioreactor; 3. Tank body; 4. Electrolysis device; 5. Baffle plate; 6. Biogas chamber; 7. Anaerobic reaction chamber; 8. Ventilation hole; 9. Molecular sieve; 10. Stirring device; 11. Power supply; 12. Cathode; 13. Anode; 14. Biogas outlet; 15. Water outlet; 16. Sealing door; 17. Tank body; 18. First partition wall; 19. Second partition wall; 20. Decolorization zone; 21. Coagulation aid zone; 22. Flocculation zone; 23. Overflow port; 24. Water pump; 25. Gas flow meter; 26. Liquid level detector. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0023] like Figure 1 As shown, a novel anaerobic electrolytic membrane bioreactor includes a sequencing batch reactor 1 for wastewater pretreatment and an anaerobic electrolytic membrane bioreactor 2. The anaerobic electrolytic membrane bioreactor 2 includes a tank body 3 and an electrolysis device 4. The tank body 3 is a closed structure. A partition 5 divides the inner cavity of the tank body 3 into a biogas chamber 6 and an anaerobic reaction chamber 7 from top to bottom. Several ventilation holes 8 are provided on the partition 5. The biogas chamber 6 is filled with molecular sieves 9. The anaerobic reaction chamber 7 is equipped with a stirring device 10. The electrolysis device 4 includes a power supply 11, a cathode 12, and an anode 13. The cathode 12 and the anode 13 are both located in the anaerobic reaction chamber 7. A biogas outlet 14 and a water outlet 15 are provided at the top of the tank body 3. The water outlet 15 is connected to the cathode 12 through a pipe, and the biogas outlet 14 is connected to the biogas chamber 6.

[0024] In this embodiment, a sealing door 16 is installed on one side of the biogas chamber 6 for periodically replacing the molecular sieve 9 inside the biogas chamber 6.

[0025] In this embodiment, the cathode 12 is a membrane module.

[0026] In this embodiment, the membrane module is a PDA / g-C3N4 / PVDF modified flat sheet membrane coated with nickel foam. This flat sheet membrane has high antifouling properties and also has the characteristic of further degrading organic matter. At the same time, nickel foam can enhance the mechanical strength of the flat sheet membrane, improve the antifouling ability and service life of the membrane module, and its three-dimensional porous structure can uniformly disperse pressure, reduce the risk of membrane damage. Its porous structure can also improve the flow state of wastewater on the membrane surface and reduce concentration polarization. Meanwhile, surface modification (such as grafting hydrophilic groups) can reduce membrane fouling and improve flux stability. In addition, nickel foam can also serve as a biofilm carrier, providing attachment sites for microorganisms and enhancing biodegradation capabilities.

[0027] In this embodiment, the anode 13 is a carbon felt.

[0028] In this embodiment, the sequencing batch reactor 1 includes a tank body 17. The inner cavity of the tank body 17 is divided into a decolorization zone 20, a coagulation aid zone 21, and a flocculation zone 22 by a first partition wall 18 and a second partition wall 19. The top of the first partition wall 18 and the second partition wall 19 are both provided with overflow ports 23, and the overflow port 23 of the second partition wall 19 is lower than the overflow port 23 of the first partition wall 18, so that the decolorization zone 20 and the coagulation aid zone 21 overflow from the top to the next water treatment zone. The flocculation zone 22 is connected to the anaerobic reaction chamber 7 by a water pump 24. Through a non-powered pretreatment method, the overflow effect is used to make the sewage undergo decolorization treatment, coagulation aid treatment and flocculation treatment in sequence, reducing energy consumption. It only requires the addition of chemicals periodically by a dosing device.

[0029] In this embodiment, a gas flow meter 25 is connected to the biogas outlet 14 to control the methane output.

[0030] In this embodiment, a liquid level detector 26 is installed in the anaerobic reaction chamber 7 to monitor the water level and prevent the water level from being too high and entering the upper biogas chamber 6.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A novel anaerobic electrolysis membrane bioreactor device comprising a sequencing batch reactor for pretreatment of wastewater and an anaerobic electrolysis membrane bioreactor tank, characterized in that, The anaerobic electrolysis membrane biological reaction tank comprises a tank body and an electrolysis device, the tank body is a closed structure, an inner cavity of the tank body is divided into a biogas chamber and an anaerobic reaction chamber from top to bottom by a partition plate, a plurality of air holes are arranged on the partition plate, the biogas chamber is filled with molecular sieves, the anaerobic reaction chamber is provided with a stirring device, the electrolysis device comprises a power supply, a cathode and an anode, the cathode and the anode are arranged in the anaerobic reaction chamber, the tank body is provided with a biogas outlet and a water outlet at the top end, the water outlet is connected with the cathode through a pipeline, and the biogas outlet is connected with the biogas chamber.

2. A novel anaerobic electrolysis membrane bioreactor device according to claim 1, characterized in that, A sealing door is arranged on one side of the biogas chamber.

3. A novel anaerobic electrolysis membrane bioreactor device according to claim 1, characterized in that, The cathode is a membrane assembly.

4. A novel anaerobic electrolysis membrane bioreactor device according to claim 3, characterized in that, The membrane assembly is a PDA / g-C3N4 / PVDF modified flat membrane coated with foamed nickel.

5. The novel anaerobic electrolysis membrane bio-reactor according to claim 1, wherein, The anode is carbon felt.

6. A novel anaerobic electrolysis membrane bioreactor device according to claim 1, characterized in that, The sequencing batch reactor comprises a tank body, an inner cavity of the tank body is sequentially divided into a decolorization zone, a coagulation aid zone and a flocculation zone by a first partition wall and a second partition wall, overflow ports are arranged at the top of the first partition wall and the second partition wall, the overflow port of the second partition wall is lower than that of the first partition wall, so that the decolorization zone and the coagulation aid zone overflow from the top to the subsequent water treatment zone, and the flocculation zone is connected to an anaerobic reaction chamber through a water pump.

7. A novel anaerobic electrolysis membrane bioreactor device according to claim 1, characterized in that, A gas flow meter is connected to the biogas outlet.

8. A novel anaerobic electrolysis membrane bioreactor device according to claim 1, characterized in that, A liquid level detector is arranged in the anaerobic reaction chamber.

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