A sewage treatment apparatus

Abstract

The present disclosure relates to a sewage treatment device, comprising: a device body having a reaction cavity inside, and provided with a water inlet and a water outlet pipeline; a membrane assembly accommodated in the reaction cavity, and separating a first chamber and a second chamber from the reaction cavity, and the water outlet pipeline being communicated to the first chamber, and the water inlet being communicated to the second chamber; biological filler having electric conductivity, and configured to be suspended and filled in the second chamber; and an electro-sorption assembly provided on a side of the membrane assembly close to the second chamber, and keeping a gap between the membrane surface of the membrane assembly and the electro-sorption assembly, and the electro-sorption assembly being configured to adsorb charged deposits accumulated on the membrane surface of the membrane assembly in an electrified state. The sewage treatment device provided by the present disclosure can improve the sewage removal capacity and solve the membrane pollution problem.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of sewage treatment and water resource recycling, and particularly relates to a sewage treatment device. BACKGROUND

[0002] In the field of sewage treatment and water resource recycling, a membrane bioreactor (MBR) is prone to membrane pollution during operation, which leads to reduced pollution removal capacity and water treatment capacity, shortened service life of the membrane, and increased operation cost of the MBR. In addition, the type of microorganisms in the MBR is relatively single, and the simultaneous removal efficiency of pollutants, especially nutrients, is low. Meanwhile, the performance of the MBR is easily affected by environmental factors such as pH and dissolved oxygen. SUMMARY

[0003] In order to solve the problems in the prior art, the present disclosure provides a sewage treatment device, which can improve the pollution removal capacity and solve the problem of membrane pollution.

[0004] According to a first aspect of the present disclosure, the present disclosure provides a sewage treatment device, comprising:

[0005] a device body, which has a reaction cavity inside and is provided with a water inlet and a water outlet pipeline;

[0006] a membrane assembly, which is accommodated in the reaction cavity and separates a first cavity and a second cavity from the reaction cavity, the water outlet pipeline is connected to the first cavity, and the water inlet is connected to the second cavity;

[0007] biological fillers, which have a conductive property and are configured to be suspended and filled in the second cavity; and

[0008] an electro-adsorption assembly, which is arranged on a side of the membrane assembly close to the second cavity and maintains a gap between the membrane surface of the membrane assembly and the electro-adsorption assembly, and the electro-adsorption assembly is configured to adsorb the charged deposits accumulated on the membrane surface of the membrane assembly in an energized state.

[0009] In an embodiment of the present disclosure, the membrane assembly comprises a membrane body in a hollow cylindrical shape, the hollow cavity of the membrane body is configured as the first cavity, and the space between the membrane body and the reaction cavity is configured as the second cavity.

[0010] In an embodiment of the present disclosure, the membrane body comprises a plurality of layers of filtration membranes arranged in a nested manner from inside to outside, and the electro-adsorption assembly is arranged at the periphery of at least the outermost layer of filtration membranes.

[0011] In an embodiment of the present disclosure, the electro-adsorption assembly comprises a conductive mesh, the mesh hole size of the conductive mesh is greater than the size of a single filler particle of the biological fillers, and the conductive mesh is in a hollow cylindrical shape and circumferentially surrounds the periphery of the membrane assembly.

[0012] In one embodiment of the present disclosure, the hollow cavity of the membrane body has an open top; the membrane assembly further comprises a water collecting member having a water collecting cavity inside, the water collecting member is installed on the top of the membrane body, and the water collecting cavity is communicated with the open top, and the water outlet pipeline is communicated to the first chamber through the water collecting cavity.

[0013] In one embodiment of the present disclosure, the water collecting cavity comprises a convex cavity part protruding upward from the top of the water collecting cavity, the convex cavity part extends along the circumference of the membrane body and is located directly above the membrane body.

[0014] In one embodiment of the present disclosure, the device body is further provided with an air inlet; the sewage treatment device further comprises an aeration assembly; the aeration assembly has an aeration port communicated with the air inlet, the aeration port is arranged along the bottom edge of the membrane assembly and is located directly below the bottom of the membrane assembly.

[0015] In one embodiment of the present disclosure, the device body is further provided with an air inlet; the second chamber comprises a first sub-chamber filled with a mixture of biological filler and sewage, and a second sub-chamber not filled with the mixture of biological filler and sewage, the second sub-chamber is communicated with an air outlet, and the air outlet and the air inlet are communicated by a pipeline to form a gas circulation pipeline.

[0016] In one embodiment of the present disclosure, the water outlet pipeline is communicated with a water pump,

[0017] The water pump is configured to be operated in forward rotation or reverse rotation, wherein when the water pump is configured to be operated in forward rotation, the water pump sucks the filtrate in the first chamber through the water outlet pipeline; and when the water pump is configured to be operated in reverse rotation, the water pump pumps the flushing liquid into the first chamber through the water outlet pipeline.

[0018] In one embodiment of the present disclosure, the sewage treatment device further comprises a constant temperature assembly for providing a predetermined temperature condition for the mixture of sewage and biological filler, the constant temperature assembly comprises a sandwich layer circumferentially surrounding the side wall of the reaction cavity, the sandwich layer is filled with a heat medium, and the reaction cavity is respectively provided with a medium inlet and a medium outlet communicated with the sandwich layer on the radially opposite sides, and the medium inlet is arranged lower than the medium outlet.

[0019] In one embodiment of the present disclosure, the material of the biological filler is selected from at least one of the following: graphene polymer composite material, biochar three-dimensional graphene composite material and graphene three-dimensional assembly material; and the volume of a single filler particle of the biological filler is 0.1-1 cm 3 , and the density is 0.015-0.025 g / cm3 porosity of 92-98.2%, graphene weight content of 0.5-0.9%, and specific surface area of 70.0-80.0 m 2 / g.

[0020] In an embodiment of the present disclosure, the membrane assembly comprises a hollow cylindrical membrane body, the device body further comprises at least two groups of support units arranged in sequence along the axial direction of the membrane assembly, each group of the support units comprises at least two fixed supports uniformly distributed along the circumferential direction of the membrane assembly, and the inner side wall of the reaction cavity is provided with a fixed support seat, one end of the fixed support is connected to the membrane assembly, and the other end is connected to the fixed support seat. In an embodiment of the present disclosure, the device body is further provided with a dosing port and / or a sampling port, and the dosing port and / or the sampling port are in communication with the second chamber.

[0021] In an embodiment of the present disclosure, the membrane assembly comprises a hollow cylindrical membrane body, the device body is further provided with an air inlet and a sludge outlet, the bottom of the device body is configured as an inverted conical frustum with a gradually converging caliber from top to bottom, and the center of the bottom surface of the inverted conical frustum is configured as the center of the bottom of the reaction cavity; the membrane assembly coincides with the axial center of the reaction cavity, the air inlet, the sludge outlet and the water inlet are arranged on the bottom surface of the conical frustum, and the air inlet is located at the center of the bottom surface of the conical frustum.

[0022] In an embodiment of the present disclosure, the gap width between the electric adsorption assembly and the membrane surface of the membrane assembly is 1-5 cm.

[0023] An embodiment of the present disclosure provides a sewage treatment device, which comprises a device body, a membrane assembly, biological fillers and an electric adsorption assembly. The membrane assembly can separate the reaction cavity of the device body into a first chamber and a second chamber. The second chamber is filled with suspended biological fillers. Sewage can enter the second chamber and mix with the biological fillers. The membrane assembly can filter the mixture of sewage and biological fillers to perform solid-liquid separation. The biological fillers can adsorb pollutants, optimize the structure of biological community and the micro-ecological environment, form a different micro-environment system of the outer layer and the inner layer of the biological fillers with synergistic bacteria, and strengthen the simultaneous removal efficiency of nutrients. In addition, the biological fillers have a certain adsorption capacity and conductivity, and can also adsorb protein pollutants and small particle pollutants in water to slow down the pollution process of the membrane assembly. Furthermore, the electric adsorption assembly arranged on the side of the membrane assembly close to the second chamber can adsorb the charged deposits accumulated on the membrane surface of the membrane assembly to relieve the in-situ membrane pollution, thereby further strengthening the pollutant removal performance and improving the membrane pollution.

[0024] Therefore, the sewage treatment device provided by the embodiment of the present disclosure is coupled with a membrane bioreactor and a moving bed membrane biofilm reactor, and a multi-sludge system of a biofilm, suspended sludge and the like outside a filter cake layer of a biological carrier and a membrane assembly is constructed, which can effectively improve the pollutant removal performance, and the electric adsorption assembly can adsorb the pollutants on the membrane surface, effectively adsorb and degrade the pollutants and relieve the membrane pollution.

[0025] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0027] Figure 1 is a structural schematic diagram of a sewage treatment device provided by an embodiment of the present disclosure;

[0028] Figure 2 is a structural schematic diagram of a device body of the sewage treatment device provided by an embodiment of the present disclosure;

[0029] Figure 3 is a structural schematic diagram of a membrane assembly in the sewage treatment device provided by an embodiment of the present disclosure;

[0030] Figure 4 is a top view of a water collecting member;

[0031] Figure 5 is a top view of an aeration ring;

[0032] Figure 6 is a structural schematic diagram of an aeration assembly in the sewage treatment device provided by an embodiment of the present disclosure;

[0033] Figure 7 is a structural schematic diagram of a membrane assembly in the sewage treatment device provided by another embodiment of the present disclosure.

[0034] Figures 1 to 7 The one-to-one correspondence between the names of the components in the figures and the reference numerals is as follows:

[0035] 10, device body; A, reaction cavity; 10A, top plate component; 10B, middle cylinder component; 10C, bottom component; 11, water inlet; 12, water outlet pipeline; 13, air inlet; 14, air outlet; 15, airflow control assembly; 16, dosing port; 17, sludge discharge port; 20, membrane assembly; 21, membrane body; 210, filter membrane; A1, first chamber; A2, second chamber; A21, first sub-chamber; A22, second sub-chamber; 30, biological filler; 40, electro-adsorption assembly; 41, conductive mesh; 50, water collecting component; B, water collecting cavity; B1, convex cavity portion; 60, aeration assembly; 61, aeration port; 62, aeration head; 63, air inlet pipeline; 64, aeration tank; 64A, aeration zone; 71, water pump; 80, constant temperature assembly; 81, interlayer; 82, medium inlet; 83, medium outlet; 90, support unit; 91, fixed support. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present disclosure will now be described in detail below with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application or uses.

[0038] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0039] Note that similar reference numerals and letters indicate similar items throughout the drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0040] The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0041] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and are not intended to limit the absolute positions of the relevant parts.

[0042] In this document, "first", "second", and the like are used only to distinguish between the relevant parts from each other, and are not intended to indicate importance and order, and a prerequisite for each other.

[0043] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use, etc.

[0044] MBR (Membrane Bio-Reactor), also known as membrane bioreactor, is a new type of water treatment technology combined with membrane separation unit and biological treatment unit, which can separate sludge retention time and hydraulic retention time, is easy to manage and control, has the advantages of stable water quality, less residual sludge, and can efficiently treat municipal wastewater and industrial wastewater. However, MBR will face membrane fouling problem in wastewater treatment process.

[0045] Membrane fouling refers to the physical and chemical interaction between sludge flocs, colloidal particles, organic or inorganic salts in the mixed liquor and the membrane, which causes the deposition and accumulation on the membrane surface, or the blockage of the membrane micropores due to adsorption, resulting in irreversible changes in membrane flux and separation characteristics.

[0046] Membrane fouling problem will lead to the decrease of MBR pollution removal capacity and treatment water volume, the shortening of membrane service life, and the increase of MBR operation cost. In addition, the type of MBR microorganisms is relatively single, and the simultaneous removal efficiency of pollutants, especially nutrients, is low. At the same time, the performance of MBR is easily affected by environmental factors such as pH and dissolved oxygen.

[0047] In related technologies, the membrane fouling cleaning technology adopted is to take out the membrane assembly for chemical cleaning, which is high in cost and troublesome in operation, and the chemical reagents used for cleaning and the air entering in the operation process are easy to cause the fluctuation of anaerobic system removal capacity.

[0048] The moving bed biofilm reactor is a new type of biofilm reactor, which is developed on the basis of fixed bed reactor, fluidized bed reactor and biological filter and is an improved new type of composite biofilm reactor. The moving bed biofilm reactor is a membrane wastewater treatment technology, which adds a certain amount of suspended carrier (biological filler) into the reactor to improve the biomass and biological species in the reactor. When aeration is carried out, the biological filler and water present as gas, liquid and solid three phases. The collision and shearing action of the carrier in water make the air bubbles smaller, and the shearing on the membrane surface is strengthened.

[0049] The moving bed biofilm reactor overcomes the shortcomings of fixed bed reactor, fluidized bed reactor and submerged biological filter, such as the need for periodic backwashing, the need for carrier fluidization, the need for cleaning filter material and replacing aeration device, etc., and retains the characteristics of traditional biofilm method, such as impact load resistance, low sludge yield and long sludge age. Moreover, compared with activated sludge method, the moving bed biofilm reactor can maintain more nitrifying bacteria due to long sludge age, and has better denitrification effect.

[0050] In order to solve the problems of membrane fouling and low pollutant removal efficiency of MBR, the sewage treatment device provided by the embodiments of the present disclosure can effectively adsorb and degrade pollutants, alleviate membrane fouling, and strengthen the pollutant removal performance.

[0051] As shown in Figure 1 , the sewage treatment device provided in the embodiment of the present disclosure comprises:

[0052] a device body 10, which has a reaction cavity A inside and is provided with a water inlet 11 and a water outlet pipeline 12;

[0053] a membrane assembly 20, which is accommodated in the reaction cavity A and separates the reaction cavity A into a first cavity A1 and a second cavity A2, and the water outlet pipeline 12 is connected to the first cavity A1 and the water inlet 11 is connected to the second cavity A2;

[0054] biological fillers 30, which have electric conductivity and are configured to be suspended and filled in the second cavity A2; and

[0055] an electro-adsorption assembly 40, which is arranged on the side of the membrane assembly 20 close to the second cavity A2 and keeps a gap between the membrane surface of the membrane assembly 20 and the electro-adsorption assembly 40, and the electro-adsorption assembly 40 is configured to adsorb the charged deposits accumulated on the membrane surface of the membrane assembly 20 in the electrified state.

[0056] In the above scheme, the membrane assembly 20 is arranged in the sewage treatment device, which can separate the reaction cavity A into the first cavity A1 and the second cavity A2, the biological fillers 30 are filled in the second cavity A2 in suspension, the sewage can enter the second cavity A2 to mix with the biological fillers 30, and the membrane assembly 20 can filter the mixture of the sewage and the biological fillers 30 to perform solid-liquid separation; the biological fillers 30 can adsorb pollutants, optimize the structure of biological community and the micro-ecological environment, form a different micro-environment system of the outer layer-inner layer of the biological fillers 30 with the synergistic effect of multiple bacteria, and strengthen the simultaneous removal efficiency of nutrients, at the same time, the biological fillers 30 have a certain adsorption capacity and electric conductivity, which can also adsorb protein pollutants and small-particle pollutants in water to slow down the pollution process of the membrane assembly 20; in addition, the electro-adsorption assembly 40 is arranged on the side of the membrane assembly 20 close to the second cavity A2, which can adsorb the charged deposits (including the biological fillers 30 and pollutants on the membrane surface, etc.) accumulated on the membrane surface of the membrane assembly 20 to slow down the in-situ membrane pollution, further strengthen the pollutant removal performance, and improve the membrane pollution.

[0057] Therefore, the sewage treatment device provided in the embodiment of the present disclosure couples the membrane bioreactor and the moving bed membrane biofilm reactor, constructs a multi-sludge system of the biological carrier and the biofilm of the filter cake layer outside the membrane assembly 20, suspended sludge, etc., can effectively improve the pollutant removal performance, and the electro-adsorption assembly 40 can adsorb and degrade the pollutants on the membrane surface to slow down the membrane pollution.

[0058] For the convenience of understanding, the following refers to Figures 1 to 7The specific structure of the sewage treatment device and the working principle thereof will be described in detail in combination with an embodiment.

[0059] Please refer to Figure 1 In an embodiment of the present disclosure, the sewage treatment device comprises a device body 10, a membrane assembly 20, biological filler 30 and an electric adsorption assembly 40. The device body 10 has a reaction cavity A inside, and the device body 10 is provided with a water inlet 11 and a water outlet pipeline 12. The membrane assembly 20 is contained in the reaction cavity A, and the reaction cavity A comprises a first chamber A1 and a second chamber A2 separated by the membrane assembly 20. The water outlet pipeline 12 is connected to the first chamber A1, and the water inlet 11 is connected to the second chamber A2. The biological filler 30 has a conductive property and is configured to be suspended and filled in the second chamber A2 after being mixed with sewage. The electric adsorption assembly 40 is arranged on the side of the membrane assembly 20 close to the second chamber A2 and maintains a gap between the membrane surface of the membrane assembly 20 and the electric adsorption assembly 40. The electric adsorption assembly 40 is configured to adsorb the charged deposits accumulated on the membrane surface of the membrane assembly 20 in an energized state. It should be noted that the charged deposits can include the charged biological filler 30 and sludge flocs, colloidal particles, organic or inorganic salts and other pollutants adsorbed and accumulated on the surface of the membrane assembly 20.

[0060] In the above scheme, the sewage treatment device couples the membrane bioreactor with the moving bed membrane bioreactor. The membrane assembly 20 has micropores with a size smaller than that of a single filler particle in the biological filler 30. The membrane assembly 20 separates the reaction cavity A into the first chamber A1 and the second chamber A2. The first chamber A1 and the second chamber A2 are communicated through the micropores. The second chamber A2 is connected to the water inlet 11, and sewage substrate is fed into the second chamber A2 through the water inlet 11. Therefore, the second chamber A2 can be used as a reaction tank. The mixture of sewage and biological filler 30 in the second chamber A2 can be filtered through the membrane assembly 20 to achieve solid-liquid separation. The filtered filtrate can enter the first chamber A1 and be discharged through the water outlet pipeline 12. The filtered solid sludge is left in the second chamber A2. A sludge discharge port can be arranged on the device body 10. When the concentration of suspended solids in the sludge mixture is too high, the sludge can be discharged through the sludge discharge port.

[0061] The second chamber A2 is filled with suspended biological filler 30, which is fluidized bed filler, and has adsorption capacity and conductivity. The biological filler 30 has high mechanical strength, light weight, large specific surface area and high porosity, and can provide an attachment site for microbial growth and reproduction, and can increase the amount of microorganisms in the reactor and strengthen the process. For high-concentration organic wastewater, the adsorption of the biological filler 30 with strong adsorption capacity on the refractory pollutants can form a local high-concentration environment, optimize the microecological environment, and screen microorganisms with specific degradation ability for refractory substances. At the same time, different biological species are formed in the inner and outer layers of the biological filler 30 due to the difference in oxidation-reduction potential and substrate type. In this way, the biological filler 30 as a micro-reactor can improve the simultaneous removal efficiency of nutrients.

[0062] By arranging the electro-adsorption assembly 40 on the side of the membrane assembly 20 close to the second chamber A2 and maintaining a gap between the membrane surface of the membrane assembly 20 and the electro-adsorption assembly 40, when the electro-adsorption assembly 40 is powered on, the electro-adsorption assembly 40 can adsorb the conductive pollutants and biological filler 30 on the membrane surface of the membrane assembly 20, so that the deposits on the membrane surface are removed, the addition of the biological filler 30 is prevented from blocking the membrane assembly 20, and the in-situ membrane pollution is alleviated.

[0063] As can be seen, the sewage treatment device provided by the embodiment of the present disclosure can efficiently treat high-concentration organic wastewater or wastewater containing refractory pollutants, can realize efficient removal of pollutants, and can alleviate the problem of membrane pollution.

[0064] In an embodiment of the present disclosure, the gap width between the electro-adsorption assembly 40 and the membrane surface of the membrane assembly 20 can be 1-5 cm. Within this gap width range, the deposits on the membrane surface of the membrane assembly 20 can be more easily adsorbed by the electro-adsorption assembly 40.

[0065] In an embodiment of the present disclosure, please refer to Figure 1 and Figure 3 As shown, the membrane assembly 20 includes a membrane body 21 in the form of a hollow cylinder, and the hollow cavity of the membrane body 21 is configured as the first chamber A1. The space between the membrane body 21 and the reaction chamber A is configured as the second chamber A2. In this way, the membrane body 21 of the membrane assembly 20 is configured in the form of a hollow cylinder, which itself encloses the first chamber A1. Compared with a plate-shaped membrane, the hollow cylinder-shaped membrane body 21 has a self-supporting effect, and the structure is more compact, and has a large packing density. In a unit volume of membrane element, the effective membrane area is large, the filtration and separation efficiency is high, the land occupation area of the equipment can be greatly reduced, and the operation cost of the equipment can be reduced.

[0066] In some embodiments of the present disclosure, the membrane body 21 can be selected from hollow fiber membranes. Hollow fiber membranes refer to membranes that have a fiber-like shape and are self-supporting. Hollow fiber membranes are mainly made of polysulfone and dimethylacetamide as raw materials to process fiber filaments with hollow cavities, which have selective permeation properties. The membrane module 20 selected from hollow fiber membranes has the following advantages:

[0067] 1) High filtration precision: For example, in one embodiment of the present disclosure, the membrane body 21 can be selected from hollow fiber membranes with a pore size of 0.1-0.4 μm. In this way, suspended particulate impurities larger than the pore size can be removed from the mixed solution, and the removal rate of total bacteria can reach 99.99%, and the removal rate of coliform bacteria can reach 100%. 2) High packing density: In a unit volume of membrane element, the effective membrane area of hollow fiber membranes is the largest, and the filtration and separation efficiency is the highest, thereby greatly reducing the land occupation area of the membrane filtration equipment, saving the cost of civil engineering, reducing investment, and reducing operating costs. 3) Low filtration pressure: The continuous membrane filtration equipment using hollow fiber separation membranes has very low operating pressure, usually operating pressure is 0.05-0.08 MPa, thereby reducing energy consumption, reducing investment, and reducing operating costs. 4) Easy to clean: Due to the structure of the single skin layer of the hollow fiber membrane, backwashing and chemical cleaning can be performed. 5) Repairable: The hollow fiber membrane element is assembled by several thousand or tens of thousands of hollow fiber filaments. Once an individual fiber filament is damaged, it can be detected by a certain method, and the membrane element can be repaired. The repaired membrane element can continue to be used without any effect on the separation effect. Of course, it should be understood that the membrane body 21 of the membrane module 20 is not limited to hollow fiber membranes. For example, the membrane body 21 can also be a hollow cylinder enclosed by several plate-shaped filter membranes.

[0068] In addition, it should be noted that the membrane body 21 in the sewage treatment device uses a microfiltration membrane with a pore size of 0.1-0.4 μm. For example, the membrane module 111 can be selected from PVDF hollow fiber membranes of Beijing Bishuiyuan Company with a pore size of 0.1 μm, PVDF hollow fiber membranes of Jinmian Technology Company with a pore size of 0.2 μm, and PVDF hollow fiber membranes of Mitsubishi Company of Japan with a pore size of 0.4 μm.

[0069] The smaller the pore size of the hollow fiber membrane, the better the retention effect, but the cost and pollution process will increase. The pore size of the membrane module can be optimized according to the properties of the membrane tank influent and the particle size of the sludge in the tank. For example, when the organic concentration and suspended solids of the membrane tank treatment influent of the sewage plant are low, the water plant selects a small pore size membrane module; and when the water quantity and particles of the sewage plant are large, the water plant selects a large pore size membrane module.

[0070] In addition, the membrane material can be a high-molecular organic material or an inorganic material. In one embodiment of the present disclosure, the membrane material of the membrane body 21 can be polyvinylidene fluoride (PVDF) or other high-molecular organic materials such as polyether sulfone, polypropylene, and polytetrafluoroethylene. The high-molecular organic materials have similar advantages and disadvantages, and have little difference in properties. In addition, the membrane material of the membrane body 21 can also be an inorganic particle modified high-molecular organic material, such as a composite membrane of silicon dioxide, aluminum oxide, and a high-molecular organic material, which can reduce the accumulation of pollutants on the membrane surface and slow down the membrane pollution process.

[0071] In addition, in one embodiment of the present disclosure, as shown in Figure 3 the membrane body 21 of the membrane assembly 20 can only include one layer of the filter membrane 210.

[0072] In another embodiment of the present disclosure, as shown in Figure 7 the membrane body 21 can also include multiple layers of the filter membrane 210, and the multiple layers of the filter membrane 210 are arranged in a nested manner from inside to outside, and the electric adsorption assembly 40 is arranged at the periphery of at least the outermost layer of the filter membrane 210.

[0073] It should be noted that in one embodiment, the filter membrane 210 can be regarded as a hollow fiber membrane with a hollow cylindrical shape formed by fiber membrane filaments. The multiple layers of the filter membrane 210 can be regarded as a plurality of hollow fiber membranes nested together. Of course, it can be understood that the filter membrane 210 can also be selected from other types of membranes in the field of sewage treatment.

[0074] It should also be noted that when the membrane assembly 20 includes multiple layers of the filter membrane 210, the electric adsorption assembly 40 can be arranged only at the periphery of the outermost layer of the filter membrane 210, and in the case of a large enough device size, the electric adsorption assembly 40 can also be arranged between adjacent two layers of the filter membrane 210.

[0075] In one embodiment of the present disclosure, as shown in Figure 1 the electric adsorption assembly 40 can include a conductive mesh 41, and the mesh hole size of the conductive mesh 41 can be larger than the size of a single filler particle of the biological filler 30. In this way, the mesh hole size of the conductive mesh 41 is large, and the biological filler 30 can pass through the mesh hole of the conductive mesh 41 without affecting the fluidization of the biological filler 30.

[0076] In one embodiment of the present disclosure, as shown in Figure 1 when the membrane body 21 is in a hollow cylindrical shape, the conductive mesh 41 also corresponds to a hollow cylindrical shape and circumferentially surrounds the periphery of the membrane assembly 20 to adsorb the accumulated substances on the circumferential surface of the membrane body 21. In one embodiment of the present disclosure, the conductive mesh 41 can be selected from any suitable material such as graphite conductive material or metal conductive material.

[0077] In one embodiment of the present disclosure, as shown in Figure 1 , Figure 3 and Figure 4 , the hollow cavity of the membrane body 21 is open at the top. The membrane assembly 20 can further comprise a water collecting member 50, which has a water collecting cavity B inside, is mounted to the top of the membrane body 21, and is in communication with the open top of the membrane body 21, and the water outlet pipeline 12 is connected to the first cavity A1 through the water collecting cavity B.

[0078] In the above scheme, the membrane assembly 20 is immersed in the mixture of sewage and biological filler 30. In order to send the filtrate in the hollow cavity of the membrane assembly 20, a water collecting member 50 can be mounted at the open top of the membrane body 21 to collect the filtrate in the hollow cavity of the membrane body 21, and a water outlet pipeline 12 is connected to the water collecting member 50.

[0079] Wherein, a water pump or the like can be provided on the water outlet pipeline 12. When the water pump pumps the filtrate in the water collecting member 50, a membrane pressure difference can be formed between the inside and outside of the membrane body 21, so that the mixture of sewage and biological filler 30 is filtered through the micropores to realize solid-liquid separation. By providing the water collecting member 50, the filtrate can be filled in the water collecting cavity B and then pumped out through the water outlet pipeline 12, so that the filtrate is more stable. When pumping liquid into the hollow cavity of the membrane body 21 through the water outlet pipeline 12, the liquid can first fill the water collecting cavity B and then enter the hollow cavity of the membrane body 21, so that the water inlet is more stable.

[0080] In one embodiment of the present disclosure, as shown in Figure 1 , Figure 3 and Figure 4 , the water collecting cavity B comprises a protruding cavity portion B1 protruding upward from the top of the water collecting cavity B, which extends along the circumference of the membrane body 21 and is located directly above the membrane body 21. In this way, by providing the protruding cavity portion B1, the top end of the membrane body 21 can be avoided to ensure that there is enough space above the membrane body 21 to collect the overflow liquid.

[0081] In one embodiment of the present disclosure, as shown in Figure 1 , Figure 3 and Figure 4 , the water collecting member 50 is configured as a substantially circular member, the protruding cavity portion B1 is annularly distributed on the top of the water collecting member 50, the top of the membrane body 21 protrudes into the water collecting cavity B, and the filtrate in the hollow cavity of the membrane body 21 can enter the water collecting cavity B through the open top of the membrane body 21 and / or the micropores under the suction pressure of the water pump.

[0082] In one embodiment of the present disclosure, as shown in Figure 1 ,Figure 3 and Figure 4 As shown in FIG. 1, the filter membrane 210 of the membrane body 21 is a single layer, and the convex cavity portion B1 is arranged in one circle around the filter membrane 210; in another embodiment of the present disclosure, the filter membrane 210 is a double layer or a multi-layer, and the convex cavity portion B1 is arranged in two or more circles around the filter membrane 210.

[0083] Of course, it can be understood that the specific structure of the water collecting member 50 is not limited to this.

[0084] In one embodiment of the present disclosure, as shown in FIG. 1, the device body 10 is further provided with an air inlet 13 in communication with the second chamber A2; the sewage treatment device further comprises an aeration assembly 60, which can be arranged in the second chamber A2 and in communication with the air inlet 13. For example, the aeration assembly 60 is arranged at the bottom of the second chamber A2. Figure 1

[0085] The above scheme can prevent the suspended bodies in the second chamber A2 from sinking under the action of aeration and can strengthen the contact between the organic matters and the microorganisms and the dissolved gas in the reaction tank to fully mix the substrates.

[0086] In one embodiment of the present disclosure, as shown in FIG. 1, the aeration assembly 60 has an aeration port 61, which can be arranged along the bottom edge of the membrane assembly 20 and located directly below the bottom of the membrane assembly 20. Figure 1

[0087] In one embodiment of the present disclosure, the aeration assembly 60 is configured to make the mixed liquid of the sewage and the biological filler 30 form an upward flow along the membrane surface of the membrane assembly 20 on the membrane proximal side and form a downward flow on the membrane distal side. The membrane proximal side is the side radially close to the membrane surface of the membrane assembly 20, and the membrane distal side is the side radially close to the inner wall of the reaction chamber A.

[0088] In the above scheme, the aeration port 61 is located directly below the membrane assembly 20. According to the structure and functional characteristics of the sewage treatment device, the second chamber can further include a bottom aeration area, an upward flow area on the membrane proximal side, and a downward flow area on the membrane distal side. As shown by the arrows in FIG. 1, the circulating flow direction of the mixed liquid in the second chamber A2 is as follows: Figure 1

[0089] ​​​Under the aeration, the mixed liquid of the sewage and the biological filler 30 rises along the membrane surface of the membrane assembly 20, washes the membrane surface of the membrane assembly 20, forms the rising flow, and drives the biological filler 30 and the suspended sludge to flow upward; after the biological filler 30 and the suspended sludge rise along the membrane surface of the membrane assembly 20 to the membrane far side away from the aeration assembly 60, the biological filler 30 and the suspended sludge begin to flow downward, the downward flow is relatively slow, a different microenvironment system of the outer layer-inner layer of the biological filler 30 with the synergistic bacteria is formed, and thus the pollutants are effectively adsorbed and degraded, and the nutrients are synchronously removed. In this way, the internal circulation flow of the mixed liquid is formed in the second chamber A2.

[0090] In one embodiment of the present disclosure, the membrane assembly 20 comprises a hollow cylindrical membrane body 21, the aeration port 61 can be circumferentially arranged below the membrane assembly 20 and the membrane body 21, the airflow direction of the aeration port 61 is substantially upward along the axial direction of the membrane body 21, so as to aerate the membrane body 21, and thus sufficiently mix the substrate and drive the mixed liquid to wash the surface of the membrane body 21. Of course, it can be understood that the arrangement of the aeration port 61 is not limited to this, and the aeration airflow direction and the flow direction of the mixed liquid driven by the aeration are also not limited to this.

[0091] It should be noted that the airflow direction of the aeration port 61 is substantially upward along the axial direction of the membrane body 21, which can mean that the aeration airflow direction is completely parallel to the axial direction of the membrane body 21, or the aeration airflow direction forms a small angle with the axial direction of the membrane body 21.

[0092] It should be further noted that in the above embodiment, the aeration assembly 60 can include but is not limited to jet aeration, air blowing aeration, strong flow aeration and other aeration modes.

[0093] The distance between the membrane assembly and the bottom of the reaction chamber (i.e. the wall of the aeration tank) can be optimized, and the optimization direction is to reduce the downward flow speed of the membrane far end, but it cannot be too far so as to cause the filler to deposit. The distance can be determined according to water simulation and experimental demonstration. Moreover, the purpose of aeration is mainly to wash the membrane surface of the membrane assembly and maintain the mixing state in the reaction chamber. The higher the gas-water ratio is, the stronger the mixing effect and the washing effect will be; and the lower the gas-water ratio is, the greater the water load will be, which will aggravate the membrane pollution.

[0094] In one embodiment of the present disclosure, please refer to FIGS. 1, 2 and 3, Figure 1 and Figure 6 It is shown that the aeration assembly 60 comprises an aeration head 62 and an air inlet pipeline 63, the air inlet pipeline 63 is connected to the air inlet 13, the bottom of the aeration head 62 is connected to the air inlet pipeline 63, and the top of the aeration head 62 is provided with an annular aeration port 61 which circumferentially surrounds the membrane body 21. It should be understood that the specific structure of the aeration assembly 60 is not limited to this.

[0095] As shown in Figure 1 , Figure 3 and Figure 5 , the membrane assembly 20 further comprises an aeration tank 64 mounted to the bottom of the membrane body 21, the aeration tank 64 is mounted to the bottom end of the membrane body 21 and is provided with an annular aeration zone 64A, and the aeration tank 64 can be a sand core aeration tank.

[0096] In an embodiment of the present disclosure, the aeration port 61 can be configured to surround the membrane surface of the membrane body 21 with aeration air flow, and the aeration air flow direction is generally axially upward along the membrane body 21, at this time, the aeration port 61 can be configured to have a radial width equal to or slightly greater than the radial width of the membrane body 21, and the inner diameter can be substantially equal to the inner diameter of the membrane body 21, and the outer diameter is substantially equal to the outer diameter of the membrane body 21.

[0097] It should be noted that in an embodiment of the present disclosure, the membrane body 21 is configured as a hollow cylinder, compared with a plate-shaped membrane, in terms of flow state, the hollow cylinder-shaped membrane body 21 can guide the water flow to form an upward flow in the center of the reaction chamber A and a membrane proximal side, and a downward flow in the membrane distal side, while the water flow of the plate-shaped membrane is dispersed, which is not conducive to the scouring of the membrane surface by the filler and mixed flow.

[0098] In the reaction tank, through biological action, especially the action of microorganisms, the decomposition of organic matter and the synthesis of organisms are completed, and the organic pollutants are converted into harmless gas products (CO2), liquid products (water) and solid products (microbial population or biological sludge) rich in organic matter.

[0099] In an embodiment of the present disclosure, as shown in Figure 1 , the second chamber A2 can further include a first sub-chamber A21 filled with a mixed solution of biological filler 30 and sewage, and a second sub-chamber A22 not filled with the mixed solution of biological filler 30 and sewage, the first sub-chamber A21 can be located below the second sub-chamber A22, and the second sub-chamber A22 can serve as a gas chamber, and the gas products in the sewage treatment can enter the second sub-chamber A22. As shown in Figure 1 , the second sub-chamber A22 can be a space enclosed by the mixed solution liquid level of the sewage and the biological filler 30 and the top of the reaction chamber A. The device body 10 can further be provided with a gas outlet 14 communicating with the gas chamber.

[0100] In an embodiment of the present disclosure, as shown in Figure 1As shown, the air outlet 14 and the air inlet 13 are connected by a pipeline to form a gas circulation pipeline. This allows the gaseous products generated after wastewater degradation to be directly recycled and used to supply gas to the aeration component 60, which is then introduced into the mixture of wastewater and biological filler 30, providing an anaerobic environment for wastewater treatment. This eliminates the need for a separate air supply device for the aeration component 60, saving costs and promoting an anaerobic environment.

[0101] In some embodiments, such as Figure 1 As shown, an airflow control component 15 can be installed on the pipeline between the air outlet 14 and the air inlet 13 to control aeration parameters. For example, the airflow control component 15 may include an air pump or the like to control the aeration rate.

[0102] It should be noted that in other embodiments, an air supply component may also be connected separately to the air inlet 13 to supply the required gas to the aeration component 60 according to actual needs.

[0103] In one embodiment of this disclosure, such as Figure 1 As shown, a water pump 71 is connected to the water outlet pipe. The water pump 71 is configured to operate in either forward or reverse direction. When the water pump 71 is configured to operate in forward direction, it draws filtrate from the first chamber A1 outward through the water outlet pipe. When the water pump 71 is configured to operate in reverse direction, it pumps flushing fluid into the first chamber A1 through the water outlet pipe.

[0104] By adopting the above scheme, and by switching the operating mode of the water pump, after the membrane module 20 has been continuously filtering for a period of time, the water flow can be controlled to flow in reverse through the filter cake layer on the membrane surface of the membrane module 20. This causes the filter cake layer to expand and suspend, and the shear force of the water flow and the collision friction of the particles clean the filter cake layer, causing the dirt in the filter cake layer to detach and be discharged with the backwash water, thus achieving backwashing of the membrane module 20. In this way, when membrane fouling intensifies, the electro-adsorption component 40 can be energized, adsorbing the bio-filler 30 and sludge with good conductivity on the outer surface of the membrane module 20, causing the deposits on the membrane surface of the membrane module 20 to detach. Combined with the backwashing technology, the deposits on the membrane surface of the membrane module 20 can be thoroughly cleaned.

[0105] In one embodiment of this disclosure, such as Figure 1 As shown, the wastewater treatment device may further include a control unit, which may be electrically connected to the water pump 71. The water pump 71 may be configured to operate in forward, reverse, or paused operation. The control unit is used to control the water pump 71 to switch operating states according to a predetermined pulse cycle.

[0106] In one embodiment of this disclosure, a period includes a first time period, a second time period, and a third time period arranged sequentially; wherein,

[0107] During the first time period, the control unit controls the water pump 71 to run in forward rotation to pump the filtrate of the first chamber A1;

[0108] During the second time period, the control unit controls the water pump 71 to suspend operation;

[0109] During the third time period, the control unit controls the water pump 71 to run in reverse rotation, and the filtrate is pumped into the first chamber A1 to backwash the membrane assembly 20.

[0110] If the continuous filtration mode is adopted, the filter cake layer and the gel layer on the membrane assembly 20 will continue to thicken, and the membrane pollution will gradually increase. In the above scheme, the intermittent water outlet is adopted. During the time period when the filtrate pumping is stopped, the rising gas-liquid two-phase flow will scour the membrane surface, reduce the influence of concentration polarization, and the deposits deposited on the membrane surface will also be driven by the gas-liquid two-phase flow to return to the sewage mixed solution, thereby reducing the influence of membrane pollution.

[0111] For example, the time length ratio of the first time period, the second time period and the third time period is 2:2:1. Specifically, in an embodiment of the present disclosure, the time length of one cycle can be 5 minutes, the first time period is 2 minutes, the second time period is 2 minutes, and the third time period is 1 minute. At this time, the membrane assembly 20 can be effectively cleaned. Of course, it can be understood that the time length of different time periods is not limited to this.

[0112] Within a suitable temperature range, the physiological activity of microorganisms is vigorous, and the activity is enhanced with the increase of temperature, and the treatment effect is better. Beyond this range, the activity of microorganisms will be poor, and the biological reaction process will be affected. Therefore, in an embodiment of the present disclosure, as shown in Figure 1 The sewage treatment device also includes a thermostat assembly 80 for providing a predetermined temperature condition for the mixed solution of sewage and biological filler 30. By providing the thermostat assembly 80, suitable temperature conditions can be provided for the reaction tank to improve the pollutant removal capacity of the sewage treatment device.

[0113] In an embodiment, the temperature of the mixed solution of sewage and biological filler is controlled by the thermostat assembly 80 to be 30-40°C or 50-60°C. Among them, the medium temperature of 30-40°C is the temperature condition of anaerobic digestion, and the pollutant removal capacity and gas production effect are stronger at this temperature. The high temperature of 50-60°C is more suitable for the growth of thermophilic methanogens, and the high-temperature anaerobic digestion has faster chemical reaction and biological reaction, and the organic matter decomposition rate is faster, which can shorten the residence time in the reactor and improve the anaerobic digestion treatment efficiency.

[0114] In one embodiment of the present disclosure, as shown in Figure 1 and Figure 2 The constant temperature assembly 80 includes a sandwich 81 circumferentially surrounding the side wall of the reaction chamber A, the sandwich 81 is filled with a thermal medium, and the reaction chamber A is respectively provided with a medium inlet 82 and a medium outlet 83 communicating with the sandwich 81. Wherein, the medium inlet 82 is lower than the medium outlet 83, and the medium inlet and outlet are configured in a lower-in and upper-out manner, which is more conducive to filling the sandwich 81 with the medium. Exemplarily, the thermal medium can include but is not limited to water.

[0115] In one embodiment of the present disclosure, the sandwich 81 can be integrally connected with the device body 10. It can be understood that the specific structure of the constant temperature assembly 80 is not limited to this.

[0116] In one embodiment of the present disclosure, the material of the biological filler 30 can be selected from at least one of the following: graphene polymer composite material, biochar three-dimensional graphene composite material, and graphene three-dimensional assembly material. Because the graphene composite material has the characteristics of high mechanical strength, light weight, large specific surface area, hydrophobicity, and good electrical conductivity, it can be used as a place for the growth and reproduction of microorganisms. According to the different types and concentrations of pollutants, different microbial communities are formed in the inner and outer layers of the graphene biological filler 30, which can strengthen the removal capacity of pollutants and effectively adsorb pollutants and small particle suspensions in the mixed solution caused by aeration shear. The membrane pollution caused by membrane hole blockage is effectively alleviated.

[0117] Exemplarily, the graphene polymer composite material can be graphene polyurethane sponge. Because the sponge has high mechanical strength and is combined with graphene tightly, it is not easy to produce small particle solid substances under the action of water flow shear force, causing membrane hole blockage.

[0118] In one embodiment of the present disclosure, the volume of a single filler particle of the biological filler 30 is 0.1-1 cm 3 , the density is 0.015-0.025 g / cm 3 , the porosity is 92-98.2%, the graphene content is 0.5-0.9%, and the specific surface area is 70.0-80.0 m 2 / g. Further, in one embodiment, the porosity of the biological filler is 98.2%, the size of the filler particle is 0.5*0.5*0.5 cm, the density is 0.02188 g / cm 3 , the surface area is 76.4 m 2 / g, and the graphene content is 0.81 wt%.

[0119] In one embodiment of the present disclosure, as shown in Figure 1As shown, the device body 10 further comprises at least two groups of support units 90 arranged along the axial direction of the membrane body 21 in sequence, each group of the support units 90 comprising at least two fixed supports uniformly distributed along the circumferential direction of the membrane body 21, and the inner side wall of the reaction cavity A is provided with a fixed support 91, one end of the fixed support is connected to the membrane assembly 20, and the other end is connected to the fixed support 91. With the above scheme, the membrane assembly 20 is supported and fixed by the fixed support, which is simple in structure and convenient to disassemble and assemble. Of course, it can be understood that the membrane assembly 20 can also be fixed in the reaction cavity A by other means.

[0120] In one embodiment of the present disclosure, the support units 90 are two groups, each group of the support units 90 comprises four fixed supports, and one group of the support units 90 is 175mm away from the top of the reaction cavity A, and the other group of the support units 90 is 478mm away from the top of the reaction cavity A.

[0121] In one embodiment of the present disclosure, as shown in Figure 1 As shown, the device body 10 can also be provided with a dosing port 16, which communicates with the second chamber A2. By providing the dosing port 16, chemical agents such as cleaning agents can be added to the mixed solution in the second chamber A2 to further improve the problem of membrane pollution. Of course, it can be understood that the dosing port 16 can also add other agents according to actual needs.

[0122] In one embodiment of the present disclosure, the device body 10 can also be provided with a sampling port, which communicates with the second chamber A2. By providing the sampling port, sampling and detection can be performed from the second chamber A2 during sewage treatment. In one embodiment of the present disclosure, the dosing port 16 and the sampling port can be the same port provided on the device body 10.

[0123] In one embodiment of the present disclosure, please refer to Figure 1 and Figure 2 As shown, the device body 10 is further provided with a sludge discharge port 17, the bottom of the device body 10 is configured as an inverted conical frustum with the caliber gradually converging from top to bottom, and the center of the bottom surface of the inverted conical frustum is configured as the center of the bottom of the reaction cavity A; the membrane body 21 coincides with the axial center of the reaction cavity A, the air inlet 13, the sludge discharge port 17 and the water inlet 11 are all arranged on the bottom surface of the conical frustum, and the air inlet 13 is located at the center of the bottom surface of the conical frustum.

[0124] In the above scheme, since the aeration assembly 60 is located directly below the membrane assembly 20 and at the center of the reaction chamber A, the gas inlet 13 can be arranged at the center of the bottom of the reaction chamber A to supply gas to the aeration assembly 60. In addition, the water inlet 11 is located at one side of the gas inlet 13, and the sewage entering the second chamber A2 from the water inlet 11 can directly flow upward under the action of aeration, which is conducive to uniform mixing of the substrate. In addition, the bottom of the device body 10 is configured as an inverted conical frustum, which is conducive to sludge discharge. Of course, it can be understood that the arrangement positions of the gas inlet 13, the sludge outlet 17 and the water inlet 11 are not limited to this.

[0125] In one embodiment of the present disclosure, as shown in Figure 2 The device body 10 can include a top plate member 10A, a middle cylinder member 10B and a bottom member 10C in the shape of an inverted conical frustum, which are sequentially connected to enclose the reaction chamber A.

[0126] The size parameters of the sewage treatment device provided in one embodiment of the present disclosure are illustrated as follows:

[0127] In one embodiment of the present disclosure, the thickness of the interlayer 81 of the constant-temperature assembly 80 is 20 mm, and the diameter of the medium outlet 83 is 7 mm. The height of the gas chamber (i.e., the distance between the liquid level of the mixture of sewage and biological filler 30 and the top of the reaction chamber A) is 80 mm, and the diameter of the gas chamber can be 300 mm.

[0128] The axial height of the middle cylinder member 10B is 460 mm, and the diameter is 210 mm. The upper end of the bottom member is connected to the lower end of the middle cylinder member 10B and has the same diameter, both of which are 300 mm. The diameter of the bottom of the conical frustum of the bottom member 10C is 70 mm, and the axial height of the bottom member 10C is 40 mm.

[0129] The diameter of the dosing port 16 is 7 mm, and the axial distance between the dosing port 16 and the top plate member 10A is 340 mm. The diameter of the water inlet 11 is 7 mm, the diameter of the gas inlet 13 is 7 mm, and the diameter of the sludge outlet 17 is 7 mm. The water inlet 11 and the sludge outlet 17 are arranged on the diametrically opposite sides of the gas inlet 13, and the distance between the gas inlet 13 and the water inlet 11 is 10 mm, and the distance between the sludge outlet 17 and the gas inlet 13 is 10 mm.

[0130] The inner diameter of the membrane assembly is 5 mm, the outer diameter is 13 mm, and the axial height is 275 mm. The inner diameter of the convex cavity part B1 of the water collecting member is 5 mm, and the outer diameter is 13 mm. The inner diameter of the annular aeration port 61 of the aeration head 62 is 5 mm, and the outer diameter is 13 mm.

[0131] It can be understood that the above is only an example, and the size parameters in the sewage treatment device are not limited thereto.

[0132] In summary, the sewage treatment device provided by the embodiments of the present disclosure can be applied to organic high-concentration wastewater or refractory pollutants, realizes efficient removal of pollutants, has the advantages of compact structure, smooth optimization, small occupied area, low consumption and high efficiency, and effectively solves the problems of membrane pollution and cleaning after membrane pollution intensifies during device operation.

[0133] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A sewage treatment apparatus characterised in that, The device comprises: a device body having a reaction cavity inside, and provided with a water inlet and a water outlet pipeline; a membrane assembly accommodated in the reaction cavity and separating a first cavity and a second cavity from the reaction cavity, the water outlet pipeline being communicated to the first cavity, and the water inlet being communicated to the second cavity; biological fillers having electric conductivity and configured to be suspended and filled in the second cavity; and an electric adsorption assembly provided on a side of the membrane assembly close to the second cavity and having a gap with a membrane surface of the membrane assembly, the gap between the electric adsorption assembly and the membrane surface of the membrane assembly being 1-5 cm, the electric adsorption assembly being configured to adsorb and accumulate charged accumulations on the membrane surface of the membrane assembly in an electrified state, the electric adsorption assembly comprising an electrically conductive mesh, the mesh having a mesh hole size greater than a single filler particle size of the biological fillers, and the electrically conductive mesh being in a hollow cylindrical shape and circumferentially surrounding a periphery of the membrane assembly. The material of the biological filler is selected from at least one of graphene polymer composite material, biochar three-dimensional graphene composite material and graphene three-dimensional assembly material; and the volume of a single filler particle of the biological filler is 0.1-1 cm 3 , the density is 0.015-0.025 g / cm 3 , the porosity is 92-98.2%, the graphene weight content is 0.5-0.9%, and the specific surface area is 70.0-80.0 m 2 / g.

2. The sewage treatment device according to claim 1, characterized in that, The membrane assembly comprises a membrane body in a hollow cylindrical shape, a hollow cavity of the membrane body being configured as the first cavity, and a space between the membrane body and the reaction cavity being configured as the second cavity.

3. The sewage treatment device of claim 2, wherein The membrane body comprises a plurality of layers of filter membranes arranged in a nested manner from inside to outside, and the electric adsorption assembly is arranged at least on a periphery of an outermost layer of filter membranes.

4. The sewage treatment device according to claim 2, wherein A top of the hollow cavity of the membrane body is an open port, the membrane assembly further comprises a water collecting member having a water collecting cavity inside, the water collecting member being mounted to the top of the membrane body, the water collecting cavity being communicated with the open port, and the water outlet pipeline being communicated to the first cavity via the water collecting cavity.

5. The sewage treatment device of claim 4, wherein The water collecting cavity comprises a convex cavity part protruding upward from a top of the water collecting cavity, the convex cavity part extending along a circumference of the membrane body and being located directly above the membrane body.

6. The sewage treatment device of claim 1, wherein The device body is further provided with an air inlet, the sewage treatment device further comprises an aeration assembly having an aeration port communicated with the air inlet, the aeration port being arranged along a bottom edge of the membrane assembly and located directly below the bottom of the membrane assembly.

7. The sewage treatment device of claim 1, wherein The device body is further provided with an air inlet, the second cavity comprises a first sub-cavity filled with a mixture of biological fillers and sewage and a second sub-cavity not filled with the mixture of biological fillers and sewage, the second sub-cavity being provided with an air outlet communicated thereon, and the air outlet and the air inlet being communicated by a pipeline to form a gas circulation pipeline.

8. The sewage treatment device of claim 1, wherein The water outlet pipeline is communicated with a water pump, the water pump being configured to operate in a forward rotation or a reverse rotation, wherein when the water pump is configured to operate in the forward rotation, the water pump sucks filtrate in the first cavity via the water outlet pipeline, and when the water pump is configured to operate in the reverse rotation, the water pump pumps a flushing liquid into the first cavity via the water outlet pipeline.

9. The sewage treatment device of claim 1, wherein The sewage treatment device further comprises a constant temperature assembly for providing a predetermined temperature condition for the mixed liquid of sewage and biological filler, the constant temperature assembly comprises a sandwich layer circumferentially surrounding the side wall of the reaction cavity, the sandwich layer is filled with a heat medium, and the reaction cavity is respectively provided with a medium inlet and a medium outlet communicating with the sandwich layer on the diametrically opposite sides, and the medium inlet is arranged lower than the medium outlet.

10. The sewage treatment device of claim 1, wherein The membrane assembly comprises a hollow cylindrical membrane body, and the device body further comprises at least two groups of support units arranged in sequence along the axial direction of the membrane assembly, each group of the support units comprises at least two fixed supports uniformly distributed along the circumferential direction of the membrane assembly, and the inner side wall of the reaction cavity is provided with a fixed support base, one end of the fixed support is connected to the membrane assembly, and the other end is connected to the fixed support base.

11. The sewage treatment device of claim 1, wherein The device body is further provided with a dosing port and / or a sampling port, and the dosing port and / or the sampling port communicate with the second chamber.

12. The sewage treatment device of claim 1, wherein, The membrane assembly comprises a hollow cylindrical membrane body, the device body is further provided with an air inlet and a sludge discharge port, the bottom of the device body is configured as an inverted conical frustum with a gradually converging caliber from top to bottom, and the center of the bottom surface of the inverted conical frustum is configured as the center of the bottom of the reaction cavity; the membrane body coincides with the axial center of the reaction cavity, the air inlet, the sludge discharge port and the water inlet are arranged on the bottom surface of the conical frustum, and the air inlet is located at the center of the bottom surface of the conical frustum.

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