Anaerobic dynamic membrane bioreactor and sewage treatment method

Abstract

The invention discloses an anaerobic dynamic membrane bioreactor. The reactor comprises a reactor shell, a cathode, an anode and a power source, the cathode is an electroactive dynamic membrane assembly and comprises a membrane frame, a current collecting net and a conductive net base material, and an electroactive biological membrane selectively formed on a conductive macroporous base material under the dual effects of electric field stimulation and filtering separation serves as a secondary filtering layer. According to the reactor, in a continuous flow mode, the power supply device is used for adjusting the potential of the electroactive dynamic membrane cathode assembly, and an electroactive microorganism dynamic membrane with a specific function is selectively formed, so that degradation and conversion of pollutants in low-organic-strength sewage are accelerated, and improvement of the recovery efficiency and quality purification of biomass gas are realized. Meanwhile, the dynamic membrane component with low price is used as the cathode membrane, so that membrane pollution can be relieved, and the operation cost of the anaerobic membrane bioreactor is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an anaerobic dynamic membrane bioreactor and a sewage treatment method. Background Art

[0002] The anaerobic membrane bioreactor is a water treatment technology that combines membrane separation technology with anaerobic biological technology. It can achieve complete separation of hydraulic retention time and solid retention time, while reducing residual sludge and utilizing biogas resources. However, it still faces problems such as rapid membrane pollution and high operating costs when treating municipal sewage and other low organic matter concentration sewage.

[0003] Dynamic membranes are based on cheap substrates and form microbial dynamic membranes through filtration, effectively reducing the operating costs of anaerobic membrane bioreactors. However, this process is mainly aimed at wastewater with high organic loads, and the energy recovery efficiency in wastewater with low organic matter intensity is low. Therefore, how to achieve efficient energy recovery and alleviate membrane pollution is one of the main problems to be solved at present. Summary of the invention

[0004] In order to solve the above technical problems, the present invention has developed a new anaerobic dynamic membrane bioreactor with an electroactive dynamic membrane assembly as the cathode, and proposed a strategy to enhance the cooperation of bacteria in different ecological niches to improve the energy recovery efficiency, thereby achieving efficient energy recovery while effectively alleviating membrane pollution, providing technical support for the low-carbon development and low-cost operation of anaerobic membrane bioreactors.

[0005] To achieve the above technical objectives, the technical solution of the present invention is as follows:

[0006] An anaerobic dynamic membrane bioreactor comprises an inlet system, a reactor shell, an anode, an electroactive dynamic membrane assembly, a power source, an aeration system and an outlet system; the electroactive dynamic membrane assembly is a cathode, and the electroactive dynamic membrane assembly comprises a conductive substrate, a current collecting net, a membrane frame and a support plate; the inlet system introduces sewage to be treated into the reactor shell through an inlet pipe; the anode and the electroactive dynamic membrane assembly are used to be electrically connected to the power source; the electroactive dynamic membrane assembly is connected to the outlet system through an outlet pipe.

[0007] In one embodiment, the conductive substrate includes any one of carbon cloth, carbon felt, nickel foam, and titanium foam.

[0008] In one embodiment, the conductive substrate has a pore structure, and the mesh size of the pores is 100-400 meshes.

[0009] In one embodiment, the current collecting net includes any one of a stainless steel wire mesh and a titanium mesh.

[0010] In one embodiment, the current collecting net and the conductive substrate are disposed on both sides of the support plate, the current collecting net is disposed between the support plate and the conductive substrate, and the conductive substrate, the current collecting net and the support plate are jointly sleeved in a membrane frame.

[0011] In one of the embodiments, the membrane frame is provided with a suction port communicating with the inner cavity of the membrane frame, and the suction port is connected to a water outlet pipe of the water outlet system.

[0012] In one embodiment, the anode includes any one of carbon cloth, carbon felt or carbon brush.

[0013] In one of the embodiments, the distance between the electroactive dynamic membrane assembly and the anode is 5 mm to 10 mm.

[0014] In one embodiment, the power supply is a regulated DC power supply, and the voltage range of the power supply is 0.5V to 2V.

[0015] In one embodiment, the aeration system includes an aeration pipe, a gas flow meter and an aeration pump.

[0016] In one embodiment, the aeration system is disposed at the bottom of the inner cavity of the reactor shell.

[0017] In one embodiment, the anaerobic dynamic membrane bioreactor further includes a gas collection system.

[0018] A sewage treatment method, using the anaerobic dynamic membrane bioreactor, comprises the following steps:

[0019] Inoculating suspended sludge in the cavity of the reactor shell of the anaerobic dynamic membrane bioreactor;

[0020] Powering the anode and the electroactive dynamic membrane assembly and acclimating them;

[0021] The sewage to be treated is introduced into the cavity of the reactor shell through the water inlet pipe, and the sewage is passed through the electroactive dynamic membrane assembly for treatment under the suction action of the water outlet system;

[0022] The treated sewage is discharged from the reactor shell through the outlet pipe.

[0023] In one embodiment, the hydraulic retention time is 8 to 12 hours.

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

[0025] 1. The present invention prepares a combined electroactive dynamic membrane component, replaces traditional membrane materials with conductive substrates, and forms an electroactive dynamic membrane by effectively intercepting microorganisms in the reactor, thereby establishing an anaerobic dynamic membrane bioreactor system with the dynamic membrane as the cathode. Under the action of suction pressure, electroactive bacteria, fermentation bacteria, and methanogens are continuously enriched on the surface of the dynamic membrane, thereby improving the efficiency of electron transfer between microorganisms and further accelerating the degradation of organic matter and the methane production rate; in addition, the functional microorganisms on the dynamic membrane can utilize the precipitated hydrogen to further convert the CO2 produced in the fermentation process into CH4, thereby achieving quality improvement and purification of biogas, increasing methane production, and improving energy recovery efficiency.

[0026] 2. The present invention uses the electroactive dynamic membrane assembly as the cathode, thereby significantly reducing the membrane fouling rate under the synergistic effect of electrostatic repulsion and the hydrogen evolution reaction occurring at the cathode.

[0027] 3. After the microorganisms are trapped by the pore structure of the conductive substrate, the electroactive dynamic membrane with good filtration performance formed on the surface of the substrate serves as a microbial filter, replacing traditional membrane materials and reducing the operating cost of the anaerobic membrane bioreactor.

[0028] 4. The present invention utilizes the hydrogen generated in situ by the cathode electroactive dynamic membrane assembly to react with CO2 to form methane on the membrane surface, which forms a convection effect with the membrane suction process, and can effectively slow down the adhesion of pollutants on the membrane surface, thereby alleviating membrane pollution.

[0029] 5. The present invention sets the voltage range of the stabilized DC power supply to 0.5-2V. When operating in the continuous flow mode, the lower external electric field has no side effects on the microorganisms. The activated sludge microorganisms in the system can degrade easily degradable pollutants in the water body, thereby improving the treatment effect on the water body.

[0030] 6. The reactor of the present invention is used to treat sewage without chemical addition and will not cause secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings.

[0032] Figure 1 It is a schematic structural diagram of the reactor of the present invention;

[0033] Figure 2 It is a schematic diagram of the preparation process of the dynamic membrane assembly in the present invention;

[0034] Figure 3 is a diagram of the formation process of the electroactive dynamic membrane in the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the dynamic membrane assembly in the present invention;

[0036] Figure 5 is the change of methane production over time in two reactors (a. blank control group; b. experimental group) in Example 1;

[0037] Figure 6 is the change of transmembrane pressure of two reactors (a. blank control group; b. experimental group) in Example 3 over time;

[0038] Figure numerals: 1. water inlet pipe; 2. reactor shell; 3. anode; 4. electroactive dynamic membrane assembly - cathode, 41. carbon cloth, 42. current collecting net, 43. membrane frame, 44. support plate; 5. power supply; 6. aeration system, 61. aeration pipe, 62. gas flow meter, 63. aeration pump; 7. pressure gauge, 8. water outlet pipe, 9. gas collection system. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0042] In order to solve the problems of low energy recovery efficiency and membrane pollution in existing sewage treatment, an anaerobic dynamic membrane bioreactor (see Figure 1 and Figure 2), including a water inlet system, a reactor shell 2, an anode 3, an electroactive dynamic membrane assembly 4, a power supply 5, an aeration system 6 and a water outlet system; the electroactive dynamic membrane assembly 4 is a cathode, and the electroactive dynamic membrane assembly 4 includes a conductive substrate 41, a current collecting net 42, a membrane frame 43 and a support plate 44; the water inlet system introduces the water to be treated into the reactor shell 2 through a water inlet pipe 1; the anode 3 and the electroactive dynamic membrane assembly 4 are used to be electrically connected to the power supply 5; the electroactive dynamic membrane assembly 4 is connected to the water outlet system through a water outlet pipe 8.

[0043] The inventors found that by constructing a new anaerobic membrane bioreactor system with an electroactive dynamic membrane assembly as the cathode, the electroactive dynamic membrane assembly can be used to directional differentiate microbial niches, accelerate the characteristics of electron transfer in the anaerobic membrane bioreactor, thereby improving the degradation of organic matter and the rate of methanogenesis, and the functional microorganisms on the cathode membrane surface of the electroactive dynamic membrane assembly can use the precipitated hydrogen to quickly convert CO2 into CH4, achieve the quality improvement and purification of biogas, and enhance the energy recovery efficiency of sewage with low organic matter concentration. In addition, the hydrogen bubbles generated in situ by the cathode electroactive dynamic membrane assembly and the electrostatic repulsion provided can effectively inhibit membrane fouling, greatly reduce the membrane fouling rate in the anaerobic dynamic membrane bioreactor, and ensure the low-cost and efficient operation of the anaerobic membrane bioreactor.

[0044] In one embodiment, the conductive substrate 41 includes any one of carbon cloth, carbon felt, nickel foam, and titanium foam. After the electroactive dynamic membrane assembly 4 and the anode 3 are energized, an electroactive biofilm selectively formed on the conductive substrate 41 under the dual effects of electric field stimulation and filtration separation can serve as a secondary filtration layer.

[0045] In one embodiment, the conductive substrate 41 has a pore structure, and the mesh number of the pores is 100 to 400. Within this pore size range, the electroactive dynamic membrane assembly 4 can ensure good conductivity while retaining microorganisms, so that the electroactive dynamic membrane with good filtration performance can be used as a microbial filter to replace traditional membrane materials and reduce the operating cost of the anaerobic membrane bioreactor.

[0046] In one embodiment, the current collecting net 42 includes any one of a stainless steel wire mesh and a titanium mesh.

[0047] In one embodiment, the current collecting net 42 and the conductive substrate 41 are disposed on both sides of the support plate 44 , the current collecting net 42 is disposed between the support plate 44 and the conductive substrate 41 , and the conductive substrate 41 , the current collecting net 42 and the support plate 44 are jointly sleeved in the membrane frame 43 .

[0048] In the present invention, the cathode of the electroactive dynamic membrane assembly is composed of a membrane frame, a current collecting net, a conductive substrate and a support plate, and can be used as a filtering unit and a cathode at the same time. The electroactive dynamic membrane assembly intercepts and forms a microbial filter, and the microorganisms are composed of electroactive bacteria, fermentation bacteria, and methanogens (such as Figure 3 As shown in the figure); under the stimulation of the micro-electric field, the electroactive bacteria are continuously enriched on the membrane surface of the electroactive dynamic membrane assembly, the fermentation bacteria and the electroactive bacteria interact and coexist to accelerate the degradation of organic matter, and the special methanogenic bacteria enriched on the membrane surface use the carbon dioxide produced by the fermentation bacteria to generate methane, thereby increasing the methane production and achieving the quality improvement and purification of biogas.

[0049] In one embodiment, the membrane frame 43 is provided with a suction port communicating with the inner cavity of the membrane frame 43 , and the suction port is connected to the water outlet pipe 8 of the water outlet system.

[0050] In one embodiment, the anode 3 includes any one of carbon cloth, carbon felt or carbon brush.

[0051] In one embodiment, the distance between the electroactive dynamic membrane assembly 4 and the anode 3 is 5 mm to 10 mm, which can effectively ensure the mass transfer rate and electron transfer efficiency between microorganisms. Specifically, it can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm. If the distance is exceeded, the mass transfer rate and electron transfer efficiency between microorganisms cannot be achieved, resulting in low degradation and conversion efficiency of pollutants.

[0052] In one embodiment, the power supply is a stabilized DC power supply, and the voltage range of the power supply is 0.5 V to 2 V. When the voltage range of the stabilized DC power supply is set to 0.5 to 2 V, when operating in the continuous flow mode, the lower external electric field has no side effects on the microorganisms, and the activated sludge microorganisms in the system can degrade easily degradable pollutants in the water body, thereby improving the treatment effect on the water body.

[0053] In one embodiment, the aeration system 6 includes an aeration pipe 61 , a gas flow meter 62 , and an aeration pump 63 . The aeration system 6 is disposed at the bottom of the inner cavity of the reactor shell 2 .

[0054] In one embodiment, the anaerobic dynamic membrane bioreactor further comprises a gas collection system 9 for collecting gas in the reactor and measuring gas production.

[0055] The present invention also provides a method for treating sewage, using the anaerobic dynamic membrane bioreactor, comprising the following steps:

[0056] Inoculating suspended sludge in the cavity of the reactor shell 2 of the anaerobic dynamic membrane bioreactor;

[0057] The anode 3 and the electroactive dynamic membrane assembly 4 are energized and domesticated. The domestication includes domesticating the anode, suspended sludge and membrane surface sludge. The domestication method can be a conventional domestication method in the art, which will not be described in detail here.

[0058] The sewage to be treated is introduced into the cavity of the reactor shell 2 through the water inlet pipe 1, and the sewage is passed through the electroactive dynamic membrane assembly 4 for treatment under the suction action of the water outlet system;

[0059] The treated sewage is discharged from the reactor shell 2 through the outlet pipe 8 .

[0060] In one embodiment, the hydraulic retention time is 8 to 12 hours, specifically, it can be 8 hours, 9 hours, 10 hours, 11 hours or 12 hours.

[0061] The working principle of the sewage treatment method is as follows: the sewage to be treated first enters the reactor shell through the water inlet pipe, and after preliminary hydrolysis and acidification degradation by suspended microorganisms, it passes through the electroactive dynamic membrane cathode under the suction action of the outlet system; the electric potential of the cathode membrane assembly is adjusted by a power supply device, and an electroactive microbial dynamic membrane with specific functions is formed on the surface of the macroporous substrate to further degrade organic matter, thereby improving the recovery efficiency of biomass gas and achieving the purification of biomass gas.

[0062] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0063] Example 1

[0064] This embodiment provides an anaerobic dynamic membrane bioreactor (such as Figure 1 As shown), it includes a water inlet system, a reactor shell, an anode, an electroactive dynamic membrane assembly, a power supply, an aeration system and a water outlet system; the electroactive dynamic membrane assembly is a cathode, and the electroactive dynamic membrane assembly (specifically shown as Figure 2 , 4 ) includes a conductive substrate carbon cloth (the mesh number of the carbon cloth holes is 200 meshes), a current collecting net titanium mesh, a membrane frame and a support plate; the water inlet system passes the sewage to be treated into the reactor shell through the water inlet pipe; the anode and the electroactive dynamic membrane assembly are used to be electrically connected to the power supply; the electroactive dynamic membrane assembly is connected to the water outlet system through the outlet pipe. In this embodiment, the distance between the electroactive dynamic membrane assembly and the anode is 10mm, the power supply is a regulated DC power supply, and the power supply voltage is 1V.

[0065] The membrane separation performance of the electroactive dynamic membrane assembly in the filtration mode was investigated using the anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application. The experimental parameters were set as follows: the hydraulic retention time was 12h, and the measured water turbidity was maintained at around 1NTU.

[0066] The anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application were used to treat simulated domestic sewage, and the experimental conditions were set as follows:

[0067] Experimental group: influent COD400mg / L, NH4 + -N35mg / L, the regulated DC power supply voltage is 1V.

[0068] Blank control group: influent COD400mg / L, NH4 + -N35mg / L, no voltage applied.

[0069] The anaerobic dynamic membrane bioreactor was operated in continuous flow mode and the effluent of the reactor was tested after 20 days of operation. The results showed that the effluent COD of the experimental group and the blank control group was lower than 40 mg / L. During the startup phase, as the microorganisms were continuously domesticated, the methane production rates of the two groups of reactors continued to increase. As time went on, the methane production rates gradually reached a stable level. Since the microorganisms in the experimental group were more active under the stimulation of the electric field and formed a special niche differentiation, a higher methane yield could be achieved quickly. The methane yield of the blank control group can reach 1.6 L / gCOD, and the methane yield of the experimental group can be stably maintained at around 2.7 L / gCOD.

[0070] Example 2

[0071] The difference between this embodiment and embodiment 1 is that the treatment conditions are different, specifically as follows: the membrane separation performance of the electroactive dynamic membrane assembly in the filtration mode was investigated using the anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application, and the experimental parameters were set as follows: the hydraulic retention time was 12h, and the measured water turbidity was maintained at around 1NTU.

[0072] The anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application were used to treat simulated domestic sewage, and the experimental conditions were set as follows:

[0073] Experimental group: influent COD 300mg / L, NH4+-N 35mg / L, regulated DC power supply voltage 1V.

[0074] Blank control group: influent COD 300 mg / L, NH4+-N 35 mg / L, no voltage applied.

[0075] The reactor was operated in continuous flow mode and the effluent from the reactor was tested after 10 days of operation. The results showed that the effluent COD of the reactors in the experimental group and the blank control group were both lower than 40 mg / L; the methane yield of the blank control group could reach 1.5 L / gCOD, and the methane yield of the experimental group could be stably maintained above 2.5 L / gCOD.

[0076] Example 3

[0077] The difference between this embodiment and embodiment 1 is that the treatment conditions are different, specifically as follows: the membrane separation performance of the electroactive dynamic membrane assembly in the filtration mode was investigated using the anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application, and the experimental parameters were set as follows: the hydraulic retention time was 12h, and the measured water turbidity was maintained at about 1NTU.

[0078] The anaerobic dynamic membrane bioreactor (experimental group) and the conventional biofilm reactor (blank control group) of the present application were used to treat municipal sewage. The experimental conditions were set as follows:

[0079] Experimental group: influent COD was about 200-500 mg / L, and the voltage of the regulated DC power supply was 1V.

[0080] Blank control group: influent COD is about 200-500 mg / L, and no voltage is applied.

[0081] The transmembrane pressure of the two reactors varies with time when operated in continuous flow mode. Figure 6 As shown by Figure 6 It can be seen that compared with the blank control group, the membrane fouling of the cathode electroactive anaerobic dynamic membrane bioreactor with an external voltage of 1V can be greatly improved. After the reactor was operated for 5 days, the effluent of the reactor was detected. The results showed that the effluent COD of the two reactors was lower than 40mg / L. The methane yield of the blank group can reach 1.6L / gCOD, while the methane yield of the cathode electroactive anaerobic dynamic membrane bioreactor with an external voltage of 1V (experimental group) can be stably maintained at more than 2.5L / gCOD.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anaerobic dynamic membrane bioreactor, characterized in that: It comprises a water inlet system, a reactor shell (2), an anode (3), an electroactive dynamic membrane assembly (4), a power source (5), an aeration system (6) and a water outlet system; The electroactive dynamic membrane component (4) is a cathode, and the electroactive dynamic membrane component (4) comprises a conductive substrate (41), a current collecting net (42), a membrane frame (43) and a support plate (44); The water inlet system introduces the sewage to be treated into the reactor shell (2) through the water inlet pipe (1); The anode (3) and the electroactive dynamic membrane assembly (4) are used to be electrically connected to the power source (5); The electroactive dynamic membrane assembly (4) is connected to the water outlet system via a water outlet pipe (8).

2. The anaerobic dynamic membrane bioreactor according to claim 1, characterized in that: The conductive substrate (41) comprises any one of carbon cloth, carbon felt, nickel foam, and titanium foam. The conductive substrate 41 has a pore structure, and the mesh number of the pores is 100 to 400.

3. The anaerobic dynamic membrane bioreactor according to claim 1 or 2, characterized in that: The current collecting net (42) comprises any one of a stainless steel wire net and a titanium net.

4. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 3, characterized in that: The current collecting net (42) and the conductive substrate (41) are arranged on both side surfaces of the support plate (44); the current collecting net (42) is arranged between the support plate (44) and the conductive substrate (41); and the conductive substrate (41), the current collecting net (42) and the support plate (44) are jointly sleeved in the membrane frame (43).

5. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 4, characterized in that: The membrane frame (43) is provided with a suction port which is in communication with the inner cavity of the membrane frame (43), and the suction port is connected to a water outlet pipe (8) of the water outlet system.

6. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 5, characterized in that: The anode (3) comprises any one of carbon cloth, carbon felt or carbon brush.

7. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 6, characterized in that: The distance between the electroactive dynamic membrane assembly (4) and the anode (3) is 5 mm to 10 mm.

8. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 7, characterized in that: The power supply is a regulated DC power supply, and the voltage range of the power supply is 0.5V to 2V.

9. The anaerobic dynamic membrane bioreactor according to any one of claims 1 to 8, characterized in that: The aeration system (6) comprises an aeration pipe (61), a gas flow meter (62) and an aeration pump (63), and the aeration system (6) is arranged at the bottom of the inner cavity of the reactor shell (2).

10. A method for treating sewage using the anaerobic dynamic membrane bioreactor according to any one of claims 1 to 9, characterized in that: The following steps are involved: Inoculating suspended sludge in the cavity of the reactor shell (2) of the anaerobic dynamic membrane bioreactor; The anode (3) and the electroactive dynamic membrane assembly (4) are energized and acclimated; The sewage to be treated is introduced into the cavity of the reactor shell (2) through the water inlet pipe 1, and the sewage is passed through the electroactive dynamic membrane assembly (4) for treatment under the suction action of the water outlet system; The treated sewage is discharged from the reactor shell (2) through a water outlet pipe (8).

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