A method for promoting anti-membrane fouling of anaerobic membrane bioreactor under the action of electric field and its application

Abstract

The present invention discloses a method for promoting membrane fouling resistance of an anaerobic membrane bioreactor under the action of an electric field and its application, belonging to the technical field of in-situ control of membrane fouling. In the process of treating sewage, the present invention adopts a Ni / Fe LDH@C-BIO hybrid synthesized by coprecipitation and electrostatic attraction to prepare an anaerobic membrane bioreactor, and performs an electrochemical redox reaction under the action of an external electric field to achieve membrane fouling resistance. The Ni / Fe LDH@C-BIO hybrid used in the anti-membrane fouling method has a large amount of positive charge on its surface and can quickly hybridize with anaerobic sludge with a negative charge on its surface. The external electric field promotes the regulation of the electrical activity of the anaerobic sludge EPS, decomposes the main pollutants that cause membrane clogging, and alleviates the deposition of microbial flocs and their metabolites. At the same time, the LDH with acidified activated carbon as a conductive substrate has excellent specific surface area catalytic performance and conductive performance, accelerates electron transfer, thereby further improving the reaction rate and effectively improving the anti-fouling ability and membrane permeability of the membrane assembly of the anaerobic membrane bioreactor.

Description

Technical Field

[0001] The invention belongs to the technical field of in-situ control of membrane fouling, and particularly relates to a method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field and an application thereof. Background Art

[0002] Water is the source of life and the key to production. Water shortages and energy crises are major challenges facing the development of human society. Traditional sewage treatment technologies that "trade energy consumption for water quality" are no longer able to meet the requirements of sustainable development. The development of new technologies aimed at "energy regeneration and resource recovery" has become a new trend in sewage treatment innovation. Today, people are increasingly aware of the importance of striving to achieve green and sustainable development of "energy + resources" from urban sewage. To this end, the further development and widespread application of advanced treatment systems, such as anaerobic membrane bioreactors (AnMBRs), have the potential to capture all the energy and nutrient resources contained in sewage, and are a water treatment research topic with great engineering application prospects.

[0003] The anaerobic membrane bioreactor (AnMBR) combines anaerobic digestion with membrane filtration technology. While achieving both organic pollutant degradation and energy recovery, it also allows for extended microbial retention in the system through membrane retention, overcoming the problem of sludge loss under high hydraulic loads. Compared to traditional water treatment technologies, AnMBR not only offers the advantage of lower energy consumption but also, through CH4 gas recovery, makes wastewater treatment plants net energy producers. However, due to the use of membrane modules, microbial flocs and their metabolites within the reactor deposit on the membrane surface during operation. Furthermore, soluble substances in wastewater are easily adsorbed on the membrane surface, leading to membrane fouling. Severe membrane fouling significantly increases the frequency of membrane cleaning and replacement, further increasing system operating costs. Therefore, mitigating membrane fouling and achieving anti-fouling effects have become key technical challenges for AnMBR.

[0004] Wastewater has a higher viscosity at low temperatures, making it more susceptible to membrane fouling. The accumulation of microbial aggregates and their metabolites on the membrane surface, as well as the adsorption of soluble substances on the membrane surface, are important factors causing membrane fouling. Numerous studies have shown that extracellular polymers (EPS) are the main cause of membrane fouling. Control methods for AnMBR membrane fouling include increasing the hydraulic shear effect on the membrane surface, optimizing the system operation mode, and chemical cleaning. The development of in-situ membrane fouling control technology is one of the important research directions. Among them, electrochemical regulation methods can achieve in-situ control of membrane fouling. Therefore, studying a method to promote anti-membrane fouling in anaerobic membrane bioreactors under the action of an electric field will help improve membrane fouling, enhance the sustainability and efficiency of the system, and further promote the development of AnMBR technology in the field of wastewater treatment.

[0005] Patent publication number CN111792730A discloses a low-energy method for controlling membrane fouling in anaerobic membrane bioreactors. The anaerobic membrane bioreactor operates under quasi-dead-end filtration conditions, meaning no aeration occurs during membrane water extraction. When the transmembrane pressure differential measured by a pressure gauge reaches a set value, a PLC control system provides feedback and controls, triggering membrane module relaxation and simultaneous aeration. This invention requires an additional PLC control system to form a dynamic control system, making its setup and use relatively complex. Patent publication number CN105541059A proposes a sludge treatment process using a microbial electrochemical coupled expanded granular sludge bed (EGSB). This sludge undergoes anaerobic digestion and fragmentation, producing high-concentration organic wastewater containing solid particles. The high-concentration organic wastewater is then degraded by the EGSB anaerobic granular sludge, which is then further treated by the microbial electrochemical system, ensuring that the wastewater meets discharge standards. However, the disadvantages of this process include the long startup time of the EGSB and the difficulty in cultivating granular sludge. The microbial electrochemical process only acts on the aqueous phase, limiting its microbial enhancement. Furthermore, the lack of data supporting biogas production makes it unsuitable for commercial application. Summary of the Invention

[0006] The present invention introduces a method and application for promoting membrane fouling resistance in anaerobic membrane bioreactors under the action of an electric field. The anaerobic membrane bioreactor is prepared by using a Ni / Fe LDH@C-BIO hybrid synthesized by coprecipitation and electrostatic attraction, and anti-membrane fouling is achieved by electrochemical redox reaction under the action of an external electric field.

[0007] The technical solutions of the present invention are as follows:

[0008] One of the objectives of the present invention is to provide a method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field. The specific process of the anti-membrane fouling method is: using a culture medium containing inorganic salts and a carbon source to acclimate and culture sewage containing anaerobic sludge, while introducing N2 for aeration to reduce the dissolved oxygen content in the water and adjust its pH, and then adding the sewage to an electrochemical anaerobic membrane bioreactor, applying an electric field treatment to decompose extracellular polymers EPS, thereby alleviating membrane fouling of the anaerobic membrane bioreactor components.

[0009] Furthermore, the culture solution is composed of culture solution A and culture solution B, and the specific components are as follows:

[0010] Culture medium A: sodium acetate 1000 mg / L, ammonium chloride 50 mg / L, NaH2PO4 35 mg / L, yeast extract 75 mg / L, NaCl 75 mg / L, NaHCO3 200 mg / L, MgSO4·7H2O 40 mg / L, CaCl2 25 mg / L;

[0011] Culture medium B: CoCl2·6H2O 0.1g / L, ZnCl2 0.13mg / L, CuSO4·5H2O 0.1mg / L, H3BO3 0.01g / L, Na2MoO4·2H2O 0.025g / L, NiCl2·6H2O 0.024g / L, Na2WO4·2H2O 0.025g / L, MnCl2·4H2O 0.62g / L, EDTA·2Na 2g / L.

[0012] Furthermore, the anaerobic sludge concentration is 2-5 g MLVSS / L.

[0013] Furthermore, the dissolved oxygen content in the water is lower than 0.5 mg / L, and the pH adjustment range is 6.8-7.2.

[0014] Furthermore, the electrochemical anaerobic membrane bioreactor includes a cylindrical reactor loaded with sewage, a Ni / FeLDH@C-BIO hybrid, a DC power supply, an anode plate, and a cathode plate.

[0015] Furthermore, the cylindrical reactor has an inner diameter of 10 cm, a height of 15 cm, an effective volume of 1.0 L, and is made of acrylic plate.

[0016] Furthermore, the Ni / Fe LDH@C-BIO hybrid is synthesized by an in situ co-precipitation method, comprising the following steps:

[0017] S1. Soak the powdered activated carbon PAC in a hydrochloric acid solution to remove impurities in the activated carbon, wash it with deionized water several times, and dry it for later use;

[0018] S2. Ni(NO3)2·6H2O and Fe(NO3)3·9H2O were reacted at a metal molar ratio of 3:1 and a ratio of layered double hydroxide (LDH) to powdered activated carbon (PAC) of 4:1 to form a mixed suspension, titrated with NaOH to pH 10.0, and stirred for reaction;

[0019] S3, washing the mixed solution obtained in S2 with deionized water several times until neutral, and drying to obtain Ni / Fe LDH@C;

[0020] S4. Utilizing the opposite positive and negative zeta potentials on the surface, Ni / Fe LDH@C and BIO are attracted to each other through electrostatic attraction and assembled into Ni / Fe LDH@C-BIO hybrid.

[0021] Furthermore, the voltage of the DC power supply is 1V.

[0022] Furthermore, the anode plate is composed of a graphite plate, and the cathode plate is composed of a stainless steel mesh and PVDF.

[0023] The second object of the present invention is to provide a method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field, and to apply the method in improving the anti-fouling ability and membrane permeability of the membrane assembly of the anaerobic membrane bioreactor.

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

[0025] 1. The present invention differs from existing anaerobic biological treatment technologies in that it utilizes a Ni / Fe LDH@C-BIO hybrid synthesized through co-precipitation and electrostatic attraction to prepare an anaerobic membrane bioreactor. This hybrid utilizes an electrochemical redox reaction under an applied electric field to combat membrane fouling. The Ni / Fe LDH@C-BIO hybrid particle electrode, which carries a large amount of positive charge on its surface, can rapidly hybridize with negatively charged anaerobic sludge, forming a stable biological-abiotic hybrid system. This significantly improves sludge settling performance, prevents sludge from adhering to the membrane to form a dense biofilm, and alleviates membrane clogging. The LDH, based on acidified activated carbon as a conductive substrate, exhibits excellent catalytic and conductive properties specific to specific surface area, accelerating electron transfer and increasing reaction rates.

[0026] 2. The present invention provides an anti-membrane fouling method for an electrochemical anaerobic membrane bioreactor. Under the action of an external electric field and the addition of conductive C, the redox reaction of the electrochemical anaerobic membrane bioreactor is promoted, so that the electrical activity of the anaerobic sludge EPS is regulated, the main pollutants that cause membrane blockage are decomposed, and the membrane fouling caused by the deposition of microbial flocs and their metabolites on the surface of the anaerobic membrane bioreactor membrane assembly is alleviated, thereby significantly improving the anti-fouling ability and membrane permeability of the anaerobic membrane bioreactor membrane assembly.

[0027] 3. The anti-membrane fouling method of the electrochemical anaerobic membrane bioreactor designed in the present invention is not only simple in steps, cost-effective, and environmentally friendly, but also the synthesized electrochemical anaerobic membrane bioreactor has excellent specific surface area, catalytic performance and conductive performance, and can maintain good stability during long-term operation. In addition, the methane produced during the anaerobic digestion process transforms the water treatment process from energy consumption to production capacity, providing new possibilities for sustainable energy and environmental protection.

[0028] Reference numerals

[0029] Figure 1 This is a flow chart for the synthesis of the Ni / Fe LDH@C-BIO hybrid electrochemical anaerobic membrane bioreactor in Examples 1-3 of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the electrochemical anaerobic membrane bioreactor in Examples 1-3 of the present invention;

[0031] Figure 3 This is a graph showing the changes in transmembrane pressure difference of 1#, 2#, and 3# electrochemical anaerobic bioreactors in performance test 1 of the present invention;

[0032] Figure 4 This is an analysis chart of EPS composition and concentration of 1#, 2#, and 3# electrochemical anaerobic bioreactors in performance test 2 of the present invention;

[0033] Figure 5 This is a morphology of the filter cake layer on the surface of the membrane assembly of the 1#, 2#, and 3# electrochemical anaerobic bioreactors in performance test 3 of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments. The given embodiments are only for illustrating the present invention, rather than for limiting the scope of the present invention.

[0035] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0036] The quantitative tests in the following examples were repeated three times, and the results were averaged.

[0037] The experimental methods in the following examples are conventional methods unless otherwise specified.

[0038] Example 1

[0039] This embodiment provides a method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field, comprising the following steps:

[0040] S1. Use culture medium to acclimate and culture sewage containing anaerobic sludge at a concentration of 3g MLVSS / L. The culture medium consists of culture medium A and culture medium B. The specific components are as follows:

[0041] Culture medium A: sodium acetate 1000 mg / L, ammonium chloride 50 mg / L, NaH2PO4 35 mg / L, yeast extract 75 mg / L, NaCl 75 mg / L, NaHCO3 200 mg / L, MgSO4·7H2O 40 mg / L, CaCl2 25 mg / L;

[0042] Culture medium B: CoCl2·6H2O 0.1g / L, ZnCl2 0.13mg / L, CuSO4·5H2O 0.1mg / L, H3BO3 0.01g / L, Na2MoO4·2H2O 0.025g / L, NiCl2·6H2O 0.024g / L, Na2WO4·2H2O 0.025g / L, MnCl2·4H2O 0.62g / L, EDTA·2Na 2g / L.

[0043] S2. Aerate the wastewater with nitrogen until the dissolved oxygen content in the water is less than 0.5 mg / L, and adjust the pH to 7.0 with 0.1 M HCl and NaOH;

[0044] S3, such as Figure 1 Ni / Fe LDH@C-BIO hybrids were prepared as shown in Figure 2 The electrochemical anaerobic membrane bioreactor shown;

[0045] S4. Add the treated sewage in S2 to the electrochemical anaerobic membrane bioreactor, apply a voltage of 1V to the anaerobic bioreactor through a DC power supply at a room temperature of 23°C, and treat and decompose the extracellular polymer EPS.

[0046] Example 2

[0047] This embodiment provides an application of a method for promoting membrane fouling resistance in an anaerobic membrane bioreactor under the action of an electric field, comprising the following steps:

[0048] S1. Use culture medium to acclimate and culture sewage containing anaerobic sludge at a concentration of 2g MLVSS / L. The culture medium consists of culture medium A and culture medium B. The specific components are as follows:

[0049] Culture medium A: sodium acetate 1000 mg / L, ammonium chloride 50 mg / L, NaH2PO4 35 mg / L, yeast extract 75 mg / L, NaCl 75 mg / L, NaHCO3 200 mg / L, MgSO4·7H2O 40 mg / L, CaCl2 25 mg / L;

[0050] Culture medium B: CoCl2·6H2O 0.1g / L, ZnCl2 0.13mg / L, CuSO4·5H2O 0.1mg / L, H3BO3 0.01g / L, Na2MoO4·2H2O 0.025g / L, NiCl2·6H2O 0.024g / L, Na2WO4·2H2O 0.025g / L, MnCl2·4H2O 0.62g / L, EDTA·2Na 2g / L.

[0051] S2. Aerate the wastewater with nitrogen until the dissolved oxygen content in the water is less than 0.5 mg / L, and adjust the pH to 6.8 with 0.1 M HCl and NaOH;

[0052] S3, such as Figure 1 Ni / Fe LDH@C-BIO hybrids were prepared as shown in Figure 2 The electrochemical anaerobic membrane bioreactor shown;

[0053] S4. Add the treated sewage in S2 into the electrochemical anaerobic membrane bioreactor, apply a voltage of 1V to the anaerobic bioreactor through a DC power supply at a room temperature of 20°C, and treat and decompose the extracellular polymer EPS.

[0054] Example 3

[0055] This embodiment provides an application of a method for promoting membrane fouling resistance in an anaerobic membrane bioreactor under the action of an electric field, comprising the following steps:

[0056] S1. Use culture medium to acclimate and culture sewage containing anaerobic sludge at a concentration of 5g MLVSS / L. The culture medium consists of culture medium A and culture medium B. The specific components are as follows:

[0057] Culture medium A: sodium acetate 1000 mg / L, ammonium chloride 50 mg / L, NaH2PO4 35 mg / L, yeast extract 75 mg / L, NaCl 75 mg / L, NaHCO3 200 mg / L, MgSO4·7H2O 40 mg / L, CaCl2 25 mg / L;

[0058] Culture medium B: CoCl2·6H2O 0.1g / L, ZnCl2 0.13mg / L, CuSO4·5H2O 0.1mg / L, H3BO3 0.01g / L, Na2MoO4·2H2O 0.025g / L, NiCl2·6H2O 0.024g / L, Na2WO4·2H2O 0.025g / L, MnCl2·4H2O 0.62g / L, EDTA·2Na 2g / L.

[0059] S2. Aerate the wastewater with nitrogen until the dissolved oxygen content in the water is less than 0.5 mg / L, and adjust the pH to 7.2 with 0.1 M HCl and NaOH;

[0060] S3, such as Figure 1 Ni / Fe LDH@C-BIO hybrids were prepared as shown in Figure 2 The electrochemical anaerobic membrane bioreactor shown;

[0061] S4. Add the treated sewage in S2 to the electrochemical anaerobic membrane bioreactor, apply a voltage of 1V to the anaerobic bioreactor through a DC power supply at a room temperature of 25°C, and treat and decompose the extracellular polymer EPS.

[0062] Performance Testing

[0063] 1. Membrane fouling test

[0064] S1. Set up three groups of anaerobic bioreactors, numbered 1#, 2# and 3# respectively;

[0065] S2, the anaerobic bioreactor No. 1 used BIO and served as the control group; the anaerobic bioreactor No. 2 used BIO and applied a voltage of 1V and served as the experimental group; the anaerobic bioreactor No. 3 used Ni / Fe LDH@C-BIO and applied a voltage of 1V and served as the experimental group;

[0066] S3. At room temperature of 23°C, the number of days required for the transmembrane pressure (TMP) to reach 80 kPa during the operation of the three groups of anaerobic bioreactors was tested.

[0067] 2. EPS composition and concentration test

[0068] S1. Set up three groups of anaerobic bioreactors, numbered 1#, 2# and 3# respectively;

[0069] S2, the anaerobic bioreactor No. 1 used only BIO and served as the control group; the anaerobic bioreactor No. 2 used BIO and applied a voltage of 1V and served as the experimental group; the anaerobic bioreactor No. 3 used Ni / Fe LDH@C-BIO and applied a voltage of 1V and served as the experimental group;

[0070] S3. At room temperature of 23°C, the EPS composition and concentration of the three groups of anaerobic bioreactors were detected during long-term operation.

[0071] 2. Filter cake layer test on membrane surface

[0072] S1. Set up three groups of anaerobic bioreactors, numbered 1#, 2# and 3# respectively;

[0073] S2, the anaerobic bioreactor No. 1 used only BIO and served as the control group; the anaerobic bioreactor No. 2 used BIO and applied a voltage of 1V and served as the experimental group; the anaerobic bioreactor No. 3 used Ni / Fe LDH@C-BIO and applied a voltage of 1V and served as the experimental group;

[0074] S3. At room temperature of 23°C, the morphology of the filter cake layer on the membrane surface of the three groups of anaerobic bioreactors after operation was observed by scanning electron microscopy.

[0075] Experimental results:

[0076] 1. During long-term operation, TMP is monitored and used as an evaluation index for membrane fouling. When TMP reaches 80kPa, the membrane is considered to be fouled and needs to be cleaned. Figure 3 As shown in the data, in performance test 1, the number of days required for the TMP of the 3# anaerobic bioreactor to reach 80 kPa was 10 days, that is, the average usage cycle after each cleaning was 10 days, while the number of days required for the 1# and 2# anaerobic bioreactors was 4.5 days and 5.6 days, respectively, that is, the cleaning cycles were 4.5 days and 5.6 days, respectively. Compared with the 1# and 2# anaerobic bioreactors, the cycle usage time of the 3# anaerobic bioreactor was increased by 122% and 78.6%, respectively, indicating that the Ni / Fe LDH@C-BIO hybrid has great potential in promoting membrane fouling control.

[0077] 2. The results of performance test 2 are as follows Figure 4 As shown, the protein contents of 1#, 2#, and 3# were 52.1 mg / L, 22.5 mg / L, and 16.7 mg / L, respectively, and the polysaccharide contents were 17.3 mg / L, 11.2 mg / L, and 8.0 mg / L, respectively. The protein and polysaccharide contents in the experimental groups were much higher than those in the control group. More EPS was decomposed by Ni / Fe LDH@C-BIO, fundamentally alleviating membrane fouling, facilitating the long-term operation of the anaerobic membrane bioreactor, and reducing operating costs.

[0078] 3. The results of performance test 3 are as follows Figure 5 As shown, in Figure 5 The scanning electron microscope image directly shows the morphology of the filter cake layer on the membrane surface. The membrane surface of the 1# anaerobic bioreactor is covered with a dense filter cake layer. In contrast, the membrane surfaces of the 2# and 3# anaerobic bioreactors show a loose and porous dirt layer structure, and the effect of 3# is more obvious. This shows that under the action of Ni / FeLDH@C-BIO and the external electric field, the sedimentation performance of the 3# anaerobic bioreactor is significantly improved, and the anti-fouling ability and membrane permeability are also improved.

[0079] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field, characterized in that: The anti-membrane fouling method specifically comprises the following steps: culturing sewage containing anaerobic sludge with a culture medium containing inorganic salts and a carbon source, introducing nitrogen for aeration to reduce the dissolved oxygen content in the water, and adjusting its pH; then, adding the sewage to an electrochemical anaerobic membrane bioreactor, applying an electric field to decompose extracellular polymers (EPS), and thereby alleviating membrane fouling of the anaerobic membrane bioreactor components; The electrochemical anaerobic membrane bioreactor includes a cylindrical reactor loaded with sewage, a Ni / Fe LDH@C-BIO hybrid, a DC power supply, an anode plate and a cathode plate; The Ni / Fe LDH@C-BIO hybrid is synthesized by an in situ co-precipitation method, comprising the following steps: S1. Soak the powdered activated carbon PAC in a hydrochloric acid solution to remove impurities in the activated carbon, wash it with deionized water several times, and dry it for later use; S2. Ni(NO3)2·6H2O and Fe(NO3)3·9H2O were reacted at a metal molar ratio of 3:1 and a ratio of layered double hydroxide (LDH) to powdered activated carbon (PAC) of 4:1, titrated to pH 10.0 with NaOH, and stirred for reaction; S3, washing the mixed solution prepared in S2 with deionized water several times until neutral, and drying to obtain Ni / Fe LDH@C; S4. Utilizing the opposite positive and negative zeta potentials on the surface, Ni / Fe LDH@C and BIO are attracted to each other through electrostatic attraction and assembled into Ni / Fe LDH@C-BIO hybrid.

2. The method for promoting anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The culture solution is composed of culture solution A and culture solution B, and the specific components are as follows: Culture medium A: sodium acetate 1000 mg / L, ammonium chloride 50 mg / L, NaH2PO4 35 mg / L, yeast extract 75 mg / L, NaCl 75 mg / L, NaHCO3 200 mg / L, MgSO4·7H2O 40 mg / L, CaCl2 25 mg / L; Culture medium B: CoCl2·6H2O 0.1 g / L, ZnCl2 0.13 mg / L, CuSO4·5H2O 0.1 mg / L, H3BO3 0.01g / L, Na2MoO4·2H2O 0.025 g / L, NiCl2·6H2O 0.024 g / L, Na2WO4·2H2O 0.025 g / L, MnCl2·4H2O 0.62 g / L, EDTA·2Na 2 g / L.

3. The method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The anaerobic sludge concentration range is 2-5g MLVSS / L.

4. The method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The dissolved oxygen content in the water is lower than 0.5 mg / L, and the pH adjustment range is 6.8-7.

2.

5. The method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The cylindrical reactor has an inner diameter of 10 cm, a height of 15 cm, an effective volume of 1.0 L, and is made of acrylic plate.

6. The method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The power supply adopts a commercial DC power supply with a constant voltage of 1 V.

7. The method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in claim 1, characterized in that: The anode plate is made of a graphite plate, and the cathode plate is made of a stainless steel mesh and PVDF.

8. Use of the method for promoting the anti-membrane fouling of an anaerobic membrane bioreactor under the action of an electric field as claimed in any one of claims 1 to 7 in improving the anti-fouling ability and membrane permeability of a membrane assembly of an anaerobic membrane bioreactor.

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