A BE-AnMBR kitchen wastewater treatment system and method

Abstract

This invention discloses a BE-AnMBR kitchen wastewater treatment system and method, including an inlet tank, a BE-AnMBR reactor, an outlet tank, and a power supply box. The outlet of the inlet tank is connected to the inlet at the top of the BE-AnMBR reactor. A membrane module protective sleeve is installed inside the BE-AnMBR reactor, and an MBR membrane module and an aerator are installed inside the membrane module protective sleeve. The outlet of the MBR membrane module is connected to the outlet tank, and the aerator is located at the bottom of the MBR membrane module. An anode plate and a cathode plate are installed on the outside of the membrane module protective sleeve, and the membrane module protective sleeve is located between the anode plate and the cathode plate. Biochar is filled between the outside of the membrane module protective sleeve and the inner wall of the BE-AnMBR reactor. The power supply box is connected to the anode plate and the cathode plate. This system and method can improve the anaerobic fermentation efficiency of kitchen wastewater.

Description

Technical Field

[0001] This invention belongs to the field of kitchen wastewater treatment technology, and relates to a BE-AnMBR kitchen wastewater treatment system and method. Background Technology

[0002] The production of kitchen wastewater has increased rapidly with the improvement of urbanization and the rapid development of the catering industry. It is characterized by high water content, high organic matter content, and high salt and oil content. The main technical route for the resource utilization of kitchen wastewater is anaerobic fermentation technology, which is relatively mature. Currently, anaerobic membrane bioreactors (AnMBRs), which combine membrane separation technology and anaerobic fermentation, have attracted much attention in the field of wastewater and waste treatment due to their excellent microbial retention capacity. Compared with traditional anaerobic fermentation systems, they can prevent excessive loss of microorganisms and achieve good methanogenesis efficiency under high loads, thereby improving the treatment efficiency of kitchen wastewater.

[0003] Currently, an improved technology for treating kitchen wastewater based on AnMBR technology is the B-AnMBR system, which is constructed by adding biochar (B) to the AnMBR system. As an environmentally friendly material, biochar can not only adsorb toxic substances, maintain the pH stability of the system, and regulate the microbial population when added to the AnMBR system, thus providing anaerobic fermentation performance, but also has higher economic benefits compared with other carbon materials.

[0004] In addition, an E-AnMBR system was constructed by combining electrochemistry (E) with AnMBR. Electrochemistry enhances the efficiency of AnMBR, and voltage action can enrich electroactive microorganisms and electrotrophic methanogenic archaea, while enriching hydrogen-trophic methanogenic bacteria to alleviate H+ oxidative stress. + The resulting decrease in pH overcomes thermodynamic limitations and increases the degradation rate of volatile fatty acids (VFAs).

[0005] In summary, based on the AnMBR process, existing B-AnMBR and E-AnMBR improved process systems can improve the anaerobic fermentation efficiency of kitchen wastewater to a certain extent. However, the proliferation of electroactive microorganisms is difficult, the system start-up is slow, and the anaerobic fermentation efficiency needs to be further improved. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a BE-AnMBR kitchen wastewater treatment system and method that can improve the anaerobic fermentation efficiency of kitchen wastewater.

[0007] To achieve the above objectives, the BE-AnMBR kitchen wastewater treatment system of the present invention includes an inlet tank, a BE-AnMBR reactor, an outlet tank, and a power supply box.

[0008] The outlet of the inlet tank is connected to the inlet at the top of the BE-AnMBR reactor. A membrane module protective sleeve is installed inside the BE-AnMBR reactor. The membrane module protective sleeve contains the MBR membrane module and an aerator. The outlet of the MBR membrane module is connected to the outlet tank. The aerator is located at the bottom of the MBR membrane module. An anode plate and a cathode plate are installed on the outside of the membrane module protective sleeve. The membrane module protective sleeve is located between the anode plate and the cathode plate. Biochar is filled between the outside of the membrane module protective sleeve and the inner wall of the BE-AnMBR reactor. The power supply box is connected to the anode plate and the cathode plate.

[0009] Furthermore, the outlet of the inlet tank is connected to the inlet at the top of the BE-AnMBR reactor via an inlet pump;

[0010] The outlet of the MBR membrane module is connected to the outlet tank via a membrane pressure gauge, the outlet on the top side of the BE-AnMBR reactor, and the outlet pump.

[0011] Furthermore, the BE-AnMBR reactor is equipped with a screen located below the membrane module protective sleeve, biochar, cathode plate, anode plate, MBR membrane module, and aerator.

[0012] Furthermore, it also includes a sludge storage tank, with the sludge discharge port at the bottom of the BE-AnMBR reactor connected to the sludge storage tank via a sludge discharge pump.

[0013] Furthermore, an online thermometer is installed on the side of the BE-AnMBR reactor.

[0014] Furthermore, sampling ports are provided on the side of the BE-AnMBR reactor.

[0015] Furthermore, the gas circulation outlet at the top of the BE-AnMBR reactor is connected to the aerator via a gas circulation pump and a gas circulation inlet.

[0016] Furthermore, the gas outlet at the top of the BE-AnMBR reactor is connected to a gas collector.

[0017] Furthermore, the biochar is corn cob.

[0018] Furthermore, a water bath layer is provided on the outer wall of the BE-AnMBR reactor, and the water bath outlet of the water bath layer is connected to the water bath inlet on the water bath layer via a constant temperature chamber and a water bath circulation pump.

[0019] The BE-AnMBR kitchen wastewater treatment method of the present invention includes the following steps:

[0020] Water from the inlet tank enters the BE-AnMBR reactor, where it is treated using a combination of biochar, electrochemical, and membrane separation technologies before being discharged into the outlet tank.

[0021] The present invention has the following beneficial effects:

[0022] In the specific operation of the BE-AnMBR kitchen wastewater treatment system and method described in this invention, biochar is added to the anaerobic membrane bioreactor, and combined with electrochemistry and external voltage regulation, a BE-AnMBR system is constructed, which further enhances the anaerobic fermentation efficiency of kitchen wastewater based on the existing AnMBR improved process system.

[0023] This invention combines biochar with an external voltage. The good conductivity and high specific surface area of ​​biochar provide a large number of attachment, growth and reproduction sites for electroactive microorganisms in suspended sludge, promoting their growth and proliferation. This allows the electrochemical system to generate current more quickly and improves its stability.

[0024] The BE-AnMBR system enhances the activity of electroactive microorganisms in the biofilm on the electrode surface and in the suspended sludge, thereby improving the efficiency of microbial utilization of organic matter and enabling rapid reactor start-up. At the same time, it can enrich more functional bacteria such as Petrimonias, Methanosarcina, and Methanospirillum, and improve the efficiency of anaerobic methanogenesis through direct interspecies electron transfer (DIET) symtrophic nutrient production. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram showing the daily methane production of the four systems in the verification experiment;

[0028] Figure 3 This is a schematic diagram showing the SCOD concentrations in the effluent of the four systems during the verification experiment.

[0029] Figure 4 This is a schematic diagram of the pH of the effluent from the four systems in the verification experiment;

[0030] Figure 5 This is a schematic diagram of the VFA concentration in the effluent of the four systems during the verification experiment;

[0031] Figure 6 This is a schematic diagram showing the ratio of live to dead bacterial microbial abundance in the four systems during a confirmatory experiment.

[0032] Among them, 1 is the inlet tank, 2 is the inlet pump, 3 is the BE-AnMBR reactor, 4 is the outlet pump, 5 is the outlet tank, 6 is the gas circulation pump, 7 is the gas collector, 8 is the constant temperature chamber, 9 is the water bath circulation pump, 10 is the water bath layer, 11 is the water bath inlet, 12 is the water bath outlet, 13 is the MBR membrane module, 14 is the membrane module protective sleeve, 15 is the aerator, 16 is the inlet, 17 is the gas outlet, 18 is the outlet, 19 is the gas circulation outlet, 20 is the gas circulation inlet, 21 is the biochar, 22 is the power supply box, 23 is the anode plate, 24 is the cathode plate, 25 is the online thermometer, 26 is the membrane pressure gauge, 27 is the sludge pump, 28 is the sludge storage tank, 29 is the screen, and 30 is the sampling port. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0037] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0038] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0041] This invention adds biochar 21 (B) to an anaerobic membrane bioreactor (AnMBR) and combines it with electrochemistry (E) through external voltage regulation to construct a BE-AnMBR system, which further enhances the anaerobic fermentation efficiency of kitchen wastewater based on the existing AnMBR improved process system.

[0042] For details, please refer to Figure 1The BE-AnMBR kitchen wastewater treatment system of the present invention includes an inlet tank 1, an inlet pump 2, a BE-AnMBR reactor 3, an outlet pump 4, an outlet tank 5, a gas circulation pump 6, a gas collector 7, a constant temperature chamber 8, a water bath circulation pump 9, a water bath layer 10, a water bath inlet 11, a water bath outlet 12, an MBR membrane module 13, a membrane module protective sleeve 14, an aerator 15, an inlet 16, an outlet 17, an outlet 18, a gas circulation outlet 19, a gas circulation inlet 20, biochar 21, a power supply box 22, an anode plate 23, a cathode plate 24, an online thermometer 25, a membrane pressure gauge 26, a sludge pump 27, a sludge storage tank 28, a screen 29, and a sampling port 30.

[0043] A water bath layer 10 is provided on the outer wall of the BE-AnMBR reactor 3. The water bath outlet 12 of the water bath layer 10 is connected to the water bath inlet 11 on the water bath layer 10 via a constant temperature chamber 8 and a water bath circulation pump 9. The outlet of the inlet tank 1 is connected to the inlet 16 at the top of the BE-AnMBR reactor 3 via an inlet pump 2. The gas outlet 17 at the top of the BE-AnMBR reactor 3 is connected to the gas collector 7. The outlet 18 on the top side of the BE-AnMBR reactor 3 is connected to the outlet tank 5 via an outlet pump 4. A membrane module protective sleeve 14 is provided inside the BE-AnMBR reactor 3. The protective sleeve 14 houses the MBR membrane module 13 and the aerator 15. The aerator 15 is located at the bottom of the MBR membrane module 13. An anode plate 23 and a cathode plate 24 are arranged on the outside of the membrane module protective sleeve 14, which is located between the anode plate 23 and the cathode plate 24. Biochar 21 is filled between the outside of the membrane module protective sleeve 14 and the inner wall of the BE-AnMBR reactor 3. A screen 29 is provided inside the BE-AnMBR reactor 3, which is located below the membrane module protective sleeve 14, biochar 21, cathode plate 24, anode plate 23, MBR membrane module 13, and aerator 15.

[0044] The outlet of the MBR membrane module 13 is connected to the outlet tank 5 via the membrane pressure gauge 26, the outlet 18 on the top side of the BE-AnMBR reactor 3, and the outlet pump 4.

[0045] In one embodiment of the present invention, the sludge discharge port at the bottom of the BE-AnMBR reactor 3 is connected to the sludge storage tank 28 via the sludge discharge pump 27.

[0046] In one embodiment of the present invention, an online thermometer 25 is provided on the side of the BE-AnMBR reactor 3.

[0047] As one embodiment of the present invention, a sampling port 30 is provided on the side of the BE-AnMBR reactor 3.

[0048] In one embodiment of the present invention, the gas circulation outlet 19 at the top of the BE-AnMBR reactor 3 is connected to the aerator 15 via the gas circulation pump 6 and the gas circulation inlet 20.

[0049] In one embodiment of the present invention, the power supply box 22 is connected to the anode plate 23 and the cathode plate 24.

[0050] As one embodiment of the present invention, the membrane module protective sleeve 14 is provided with small holes with a pore size smaller than that of the biochar 21 to prevent the biochar 21 from causing membrane blockage.

[0051] In one embodiment of the present invention, the MBR membrane in the MBR membrane module 13 is a 0.22 μm flat sheet membrane.

[0052] As one embodiment of the present invention, the bottom of the BE-AnMBR reactor 3 is provided with a screen 29 with a pore size smaller than that of the biochar 21 to prevent the biochar 21 from being lost with the sludge.

[0053] In one embodiment of the present invention, both the anode plate 23 and the cathode plate 24 are composed of titanium wire bound with carbon felt.

[0054] In one embodiment of the present invention, the biochar 21 is corn cob, the raw material for preparing biochar 21 is corn cob, the preparation temperature is 500℃, and the heating rate is 10℃ / min.

[0055] Example 2

[0056] refer to Figure 1 This invention discloses a BE-AnMBR method for treating kitchen wastewater. The BE-AnMBR method is based on a BE-AnMBR kitchen wastewater treatment system, which includes an inlet tank 1, a BE-AnMBR reactor 3, an outlet tank 5, and a power supply box 22. The outlet of the inlet tank 1 is connected to the inlet 16 at the top of the BE-AnMBR reactor 3. A membrane module protective sleeve 14 is installed inside the BE-AnMBR reactor 3. The protective sleeve 14 houses an MBR membrane module 13 and an aerator 15. The outlet of the MBR membrane module 13 is connected to the effluent tank 5. The aerator 15 is located at the bottom of the MBR membrane module 13. An anode plate 23 and a cathode plate 24 are arranged on the outside of the membrane module protective sleeve 14. The membrane module protective sleeve 14 is located between the anode plate 23 and the cathode plate 24. Biochar 21 is filled between the outside of the membrane module protective sleeve 14 and the inner wall of the BE-AnMBR reactor 3. The power supply box 22 is connected to the anode plate 23 and the cathode plate 24.

[0057] Specifically, the BE-AnMBR kitchen wastewater treatment method includes the following steps:

[0058] Water from the inlet tank 1 enters the BE-AnMBR reactor 3, where it is treated using a combination of biochar, electrochemical, and membrane separation technologies before being discharged into the outlet tank 5.

[0059] This invention has the following characteristics:

[0060] This invention integrates biochar, electrochemical, and membrane separation technologies into anaerobic fermentation technology to construct a BE-AnMBR system. By combining biochar with an external voltage, the excellent conductivity and high specific surface area of ​​biochar provide numerous attachment sites for electroactive microorganisms in suspended sludge, promoting their growth and proliferation. This allows the electrochemical system to generate current more quickly and improves its stability. The BE-AnMBR system enhances the activity of the biofilm on the electrode surface and the electroactive microorganisms in the suspended sludge, improving the efficiency of microbial utilization of organic matter and enabling rapid reactor start-up. Simultaneously, it enriches more functional bacteria such as Petrimonias, Methanosarcina, and Methanospirillum, promoting methanogenesis through direct interspecies electron transfer (DIET) symtrophic nutrient production and improving anaerobic methanogenesis efficiency.

[0061] Based on existing anaerobic membrane bioreactors, this system can further increase methane production and methanogenesis start-up rate, and enhance methanogenesis efficiency; it can further reduce effluent VFA and SCOD concentrations, and enhance pollutant removal efficiency; it can further effectively alleviate pH drop and increase pH recovery rate, providing a more stable acid-base environment for anaerobic fermentation; and it can further increase the abundance of viable microorganisms, thereby improving anaerobic fermentation efficiency.

[0062] Confirmatory test

[0063] This embodiment includes four systems: the present invention and three control systems. The control systems are AnMBR, B-AnMBR, and E-AnMBR. The effective reactor volume of both the embodiment and the control systems is 6L. The MBR membrane used is a 0.22μm flat sheet membrane. The wastewater used is kitchen wastewater after three-phase separation from a kitchen waste treatment plant. The organic loading (OLR) of the wastewater is 3.75g / (COD·d). Each system is operated at a constant temperature of 35℃ for 51 days. Specifically, the B-AnMBR system is an AnMBR system with biochar 21 added; the E-AnMBR system is an AnMBR system with an anode plate 23 and a cathode plate 24 and an external power supply; and the BE-AnMBR system is an AnMBR system with biochar 21 added and an anode plate 23 and a cathode plate 24 and an external power supply.

[0064] The biochar 21 is corn cob biochar, with an addition amount of 10 g / L; the voltage of the external power supply is 1 V; the electrode is composed of titanium wire bound with carbon felt.

[0065] During the operation of the four-way system, the following parameters are monitored: methane production, effluent dissolved COD (SCOD), effluent pH, effluent volatile fatty acids (VFA), and the ratio of live to dead bacteria abundance in the system.

[0066] 1. Methane production of the four systems

[0067] The daily methane production changes of the four systems are as follows: Figure 2 As shown, among the four systems, the AnMBR system had the slowest start-up speed, with daily methane production only gradually increasing from day 17. The B-AnMBR and E-AnMBR systems had similar start-up speeds, with daily methane production gradually increasing from day 9. The BE-AnMBR system had the fastest start-up speed, with daily methane production beginning to gradually increase from day 5. Figure 2 It can be seen that during the operation of the four systems, the daily methane production of the BE-AnMBR system was higher than that of the other three systems for most of the time.

[0068] The results show that the addition of biochar 21 and the application of external voltage can improve the start-up speed and methanogenic yield of the AnMBR system. Combining biochar 21 with external voltage in the AnMBR system can further improve the start-up speed and methanogenic yield.

[0069] 2. SCOD concentration in the effluent of the four systems

[0070] SCOD concentration in the effluent of the four systems is as follows: Figure 3 As shown, during the operation of the four systems, the effluent SCOD concentration of the BE-AnMBR system was AnMBR > B-AnMBR > E-AnMBR > BE-AnMBR. BE-AnMBR consistently maintained the lowest concentration among the four reactors. When the reactor reached day 51 of operation, the effluent SCOD concentrations of the AnMBR, B-AnMBR, E-AnMBR, and BE-AnMBR systems were 9.1 g COD / L, 6.1 g COD / L, 6 g COD / L, and 4.8 g COD / L, respectively, with the BE-AnMBR system showing the lowest concentration. The operational results indicate that the addition of biochar 21 and the application of external voltage can effectively reduce the effluent SCOD concentration of the AnMBR system. Furthermore, combining biochar 21 with external voltage in the AnMBR system can further reduce the effluent SCOD concentration.

[0071] 3. pH of effluent from the four systems

[0072] The pH of the effluent from the four systems is as follows: Figure 4As shown, the effluent pH of all four systems exhibited a trend of first decreasing and then increasing. During the start-up phase, the effluent pH of all four systems decreased rapidly. The lowest pH values ​​for AnMBR, B-AnMBR, E-AnMBR, and BE-AnMBR were 6.3, 6.6, 6.6, and 6.9, respectively. The pH values ​​began to rise from days 18, 13, 15, and 9, and then rebounded to 7.5 or higher on days 38, 25, 28, and 17. The operational results indicate that the addition of biochar 21 and the application of external voltage can effectively alleviate the pH decrease and increase the rate of pH recovery. Furthermore, the combination of biochar 21 and external voltage in the AnMBR system can further alleviate the pH decrease and increase the rate of pH recovery, providing a more stable acid-base environment for the anaerobic fermentation reaction.

[0073] 4. Four sets of system effluent VFA

[0074] The four sets of system effluent VFA such as Figure 5 As shown, the effluent VFA and SCOD concentrations of the four systems exhibited largely consistent trends. During operation, the effluent VFA concentration of the BE-AnMBR system was in the order of AnMBR > B-AnMBR > E-AnMBR > BE-AnMBR. BE-AnMBR consistently maintained the lowest concentration among the four reactors. From day 39, the effluent VFA concentration of the BE-AnMBR system began to fall below 1 g COD / L, the B-AnMBR system from day 45, and the E-AnMBR system from day 48. However, the effluent VFA concentration of the AnMBR system remained at 2.8 g COD / L on day 51, significantly higher than the other three systems. The operational results indicate that the addition of biochar 21 and external voltage can both reduce the effluent VFA concentration. Furthermore, combining biochar 21 with external voltage in the AnMBR system can further reduce the effluent VFA concentration.

[0075] 5. Changes in the activity and mortality of bacterial microorganisms in the four systems

[0076] The changes in bacterial activity and mortality in the four systems were characterized using laser scanning confocal microscopy (CLSM) on day 51. Figure 6 As shown, the abundance of viable bacteria in the four systems AnMBR, B-AnMBR, E-AnMBR, and BE-AnMBR were 31.5%, 35.4%, 38.7%, and 44.9%, respectively. The results indicate that the addition of biochar 21 and the application of external voltage can both increase the abundance of viable bacteria in the AnMBR system. Furthermore, combining biochar 21 with external voltage in the AnMBR system can further increase the abundance of viable bacteria.

[0077] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0078] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0079] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A BE-AnMBR method for treating kitchen wastewater, characterized in that, The BE-AnMBR kitchen wastewater treatment system includes an inlet tank (1), a BE-AnMBR reactor (3), an outlet tank (5), and a power supply box (22). The outlet of the inlet tank (1) is connected to the inlet (16) at the top of the BE-AnMBR reactor (3). The BE-AnMBR reactor (3) is equipped with a membrane module protective sleeve (14). The membrane module protective sleeve (14) is equipped with an MBR membrane module (13) and an aerator (15). The outlet of the MBR membrane module (13) is connected to the outlet tank (5). The aerator (15) is located at the bottom of the MBR membrane module (13). An anode plate (23) and a cathode plate (24) are provided on the outside of the membrane module protective sleeve (14). The membrane module protective sleeve (14) is located between the anode plate (23) and the cathode plate (24). Biochar (21) is filled between the outside of the membrane module protective sleeve (14) and the inner wall of the BE-AnMBR reactor (3). The power supply box (22) is connected to the anode plate (23) and the cathode plate (24). Includes the following steps: Water from the inlet tank (1) enters the BE-AnMBR reactor (3), and is then treated in the BE-AnMBR reactor (3) using a combination of biochar technology, electrochemical technology and membrane separation technology, before being discharged into the outlet tank (5).

2. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, The outlet of the inlet tank (1) is connected to the inlet (16) at the top of the BE-AnMBR reactor (3) via the inlet pump (2); The outlet of the MBR membrane module (13) is connected to the outlet tank (5) via the membrane pressure gauge (26), the outlet (18) on the top side of the BE-AnMBR reactor (3), and the outlet pump (4).

3. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, The BE-AnMBR reactor (3) is equipped with a screen (29), which is located below the membrane module protective sleeve (14), biochar (21), cathode plate (24), anode plate (23), MBR membrane module (13) and aerator (15).

4. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, It also includes a sludge storage tank (28), and the sludge discharge port at the bottom of the BE-AnMBR reactor (3) is connected to the sludge storage tank (28) via a sludge discharge pump (27).

5. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, An online thermometer (25) is installed on the side of the BE-AnMBR reactor (3).

6. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, A sampling port (30) is provided on the side of the BE-AnMBR reactor (3).

7. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, The gas circulation outlet (19) at the top of the BE-AnMBR reactor (3) is connected to the aerator (15) via the gas circulation pump (6) and the gas circulation inlet (20) in sequence. The gas outlet (17) at the top of the BE-AnMBR reactor (3) is connected to the gas collector (7).

8. The BE-AnMBR method for treating kitchen wastewater according to claim 1, characterized in that, The biochar (21) is corn cob.

9. The BE-AnMBR kitchen wastewater treatment method according to claim 1, characterized in that, A water bath layer (10) is provided on the outer wall of the BE-AnMBR reactor (3). The water bath outlet (12) of the water bath layer (10) is connected to the water bath inlet (11) on the water bath layer (10) via a constant temperature box (8) and a water bath circulation pump (9).

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