Filtering assembly capable of being internally and externally cleaned, dynamic membrane module device and cleaning method

Abstract

The invention discloses a filter assembly capable of being internally and externally cleaned, a dynamic membrane module device and a cleaning method. The filter assembly comprises a membrane frame, a filter membrane and a pressing sheet, the filter membranes are respectively fixed on two outer side surfaces of the membrane frame by the pressing sheets, so that the filter membranes and the membrane frame jointly define an internal space; the membrane frame is provided with a top opening and a bottom opening which are communicated with the internal space and is used for cleaning the opposite inner side surfaces of the filtering membranes; the filter membrane comprises a nylon fiber membrane, the pore diameter of the nylon fiber membrane is 50-350 meshes, the warp breaking force and the weft breaking force are both 2200 N or above, and the warp breaking elongation and the weft breaking elongation are both 20% or above. The high-performance dynamic membrane module comprises a plurality of filter assemblies, an assembly frame, a cleaning aeration system and a control system, wherein the control system controls the cleaning aeration system to perform aeration operation in the tank, external cleaning of the filter assemblies and / or internal cleaning of the filter assemblies according to a detection result.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a filter component capable of being cleaned inside and outside, a dynamic membrane module and a cleaning method. Background Art

[0002] In the process of sewage treatment, the dynamic membrane module organically combines the membrane separation technology and the biological reaction process, and has become a key filtration device in this field. The performance and cleaning effect of its filter component play a crucial role in the efficiency and stability of the entire treatment system. However, there are also some limitations in using the dynamic membrane module, such as the high cost of the membrane module, the high consumption of operating costs, and the fact that during the membrane separation process, due to the continuous retention of suspended solids on the membrane surface, membrane fouling occurs, and the attenuation of the effluent flux is very large, etc. The invention patent application CN1363526A discloses a method and device for filtering the mixed liquid of a bioreactor by using a dynamic membrane. A filter component is processed with a common porous material as the substrate, and it is placed in a bioreactor with continuous water inlet, biological reaction and water outlet and submerged therein, so that the liquid level of the reactor is higher than its water outlet to form a water level difference. In the case of having cross-flow on the membrane surface, as the filtration progresses, microbial metabolites, bacteria themselves, etc. will form a biomass layer on the substrate surface through adsorption, adhesion, deposition, etc. Although this invention effectively reduces the cost by selecting low-cost materials, the fabricated dynamic membrane module is in a fixed state in the biochemical reactor, and it is difficult to solve the membrane fouling problem only by providing the cross-flow shear force on the membrane surface unidirectionally by aeration.

[0003] During the membrane filtration process, the colloids and suspended particles in the solution are trapped on the membrane surface under the filtration pressure to form a filter cake layer, resulting in a decrease in membrane flux and other phenomena. Regular cleaning is the main means to reduce membrane pollution and ensure the filtration effect of the membrane. The traditional cleaning process mainly targets the outer side of the membrane (i.e., the filtration surface) for physical brushing or chemical cleaning, such as using a rotating brush, air-water backwashing, or chemical agent soaking. However, it has been found in long-term practice that ordinary membranes have poor deformation resistance, are prone to wrinkles under the impact of high-speed water flow, and are extremely easy to wear, which seriously shortens their service life. Invention patent application CN1807279A discloses a high-throughput flexible bionic dynamic membrane component and its manufacturing method and application. The structure includes a membrane assembly, a valve, a flexible joint, a membrane frame, and a fixing card; the membrane assembly structure includes a curtain sheet composed of several porous material nets or filter cloths, a diversion cavity, and a water collection pipe. The curtain sheet is assembled by a combination of several porous material nets or filter cloths, and the surface of the membrane assembly is modified with collagen. The curtain sheet has a cavity with length and width, wherein the two sides in the length direction are bonded or sewn, and the two sides in the width direction are open. A flexible diversion grid is provided in the curtain sheet cavity to form a flexible diversion cavity; the two open ends of the curtain sheet with a flexible diversion cavity are respectively inserted into the grooves of two water collection pipes, one end of the water collection pipe is blocked, and the other end is connected to the main water outlet pipe through a matching flexible joint and valve; a fixing card is welded on the membrane frame, and the water collection pipes are fixed on the fixing card respectively. However, the invention still uses hollow fiber as the base layer, and its membrane pore size is large, resulting in poor water quality during the formation of the dynamic membrane; in addition, it is also impossible to stably produce water during the filtration process, thereby limiting the promotion and application of dynamic membranes.

[0004] Therefore, how to provide a filter membrane and a filter component thereof, wherein the filter membrane itself has excellent comprehensive performance, and the filter component has a simple and durable structure, is easy to install and maintain, and is used in a dynamic membrane module to have high filtration performance, no need to disassemble and wash, easy to clean inside and outside, durable and low cost, etc., has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide a more optimized filter assembly, a dynamic membrane module and a cleaning method that can be cleaned inside and outside. Specifically, the filter membrane uses a high-strength nylon fiber membrane as the base material, and through the coordinated design of the membrane frame, rubber pad and pressing sheet, a stable and flexible connection is achieved; the cleaning system of the dynamic membrane module and other assemblies effectively solve the technical problems existing in the prior art, such as membrane pollution, poor sealing, unstable filtering effect and poor cleaning effect.

[0006] In a first aspect, the present invention provides a filter assembly that can be cleaned inside and outside, comprising: a membrane frame, a filter membrane and a pressing sheet; The filter membrane is fixed to the two outer sides of the membrane frame by pressing the filter membrane, so that the filter membrane and the membrane frame together enclose the internal space; The membrane frame has a top opening and a bottom opening that communicate with the internal space, and is used for cleaning the opposite inner sides of the filter membrane sheets; The filter membrane sheet includes a nylon fiber membrane, the pore size of the nylon fiber membrane is 50 mesh to 350 mesh, the warp breaking force and the weft breaking force are both above 2200 N, and the warp breaking elongation rate and the weft breaking elongation rate are both above 20%.

[0007] Through material selection and structural optimization, the present invention provides a filter assembly with good filtering effect, long service life, and the ability to clean the inside and outside of the filter membrane sheets without disassembling the filter membrane sheets and the membrane frame. Among them, the membrane frame and the pressing sheet are preferably made of stainless steel to enhance the overall quality and service life of the equipment. And 1-5 top openings are provided at the top of the membrane frame, and 1-5 bottom openings are provided at the bottom, which is conducive to high-pressure water flow entering the internal space of the membrane frame through the above openings to clean the inner side of the filter membrane sheet, and flowing out the sewage and dirt after internal cleaning from the bottom opening. The filter membrane sheet uses a nylon fiber membrane, which has a long regeneration period (more than 30 days), and the flux can be restored by high-intensity aeration without consuming chemical agents, saving costs and being environmentally friendly. The nylon fiber membrane may include a single layer or multiple layers of nylon fiber layers, and is preferably composed of multiple laminated nylon fiber layers, such as forming an integral structure through three-dimensional weaving. Compared with the traditional nylon fiber membrane, it has higher strength and anti-deformation ability, and can reduce the wrinkles of the membrane sheet under the impact of high-speed water flow; the anti-fracture ability adapts to the strength of high-pressure backwashing of the membrane sheet, improving the service life of the membrane sheet.

[0008] Further, the membrane frame includes a top cover hinged to the top of the membrane frame and a bottom cover hinged to the bottom of the membrane frame; The top cover rotates to open or close the top opening, and the bottom cover rotates to open or close the bottom opening.

[0009] The top of the membrane frame of the present invention can be provided with a single top opening or multiple top openings, and the bottom can be provided with a single bottom opening or multiple bottom openings. Correspondingly, the top cover and the bottom cover can be provided with a single one or multiple ones for the openings, or an integral top cover that can cover the top of the membrane frame and an integral bottom cover that can cover the bottom of the membrane frame can be provided to respectively open or close all the top openings and all the bottom openings, improving the overall sealing performance of the membrane frame.

[0010] Further, a top cover seal is provided on the inner surface of the top cover facing the top of the membrane frame, and / or a bottom cover seal is provided on the inner surface of the bottom cover facing the bottom of the membrane frame. The top cover seal and the bottom cover seal meet at least one of the following conditions: 1) The thickness is 1-5 mm, and the foaming density is 0.1-0.6 g / m 3 ; 2) The tear strength is above 3 KN / m and the elongation rate is above 200%. 3) It includes foamed latex, selected from at least one of foamed silicone, foamed EPDM (ethylene propylene diene monomer), foamed EVA (ethylene vinyl acetate copolymer), foamed PU (polyurethane), foamed CR (neoprene), and foamed NBR (nitrile rubber).

[0011] Through the settings of the top cover seal on the inner surface of the top cover and the bottom cover seal on the inner surface of the bottom cover, it effectively prevents the leakage of liquid from the top and bottom of the membrane frame during the filtration process, ensuring the sealing performance of the filtration operation. The seal can be selected from at least one of rubber material, latex material, and foamed latex material. Preferably, foamed latex is used. The foamed latex has better compressible space and resilience. When closing the top cover / bottom cover, the foamed latex can fill the gap between the membrane frame and the top cover / bottom cover, providing better sealing performance.

[0012] The selection of different sealing materials can be based on specific working conditions requirements for selection or combined optimization. For example, in high-temperature, oil-containing or organic solvent environments, foamed CR or foamed NBR can be selected; in outdoor environments exposed to strong ultraviolet rays or ozone, foamed EPDM can be selected to specifically improve the environmental adaptability and long-term stability of the equipment, thereby extending the service life.

[0013] Preferably, the top cover seal and the bottom cover seal are made of foamed silicone, with a tear strength of about 3 - 8 KN / m, an elongation of about 200 - 600%, and a pressure strength of about 0.1 - 0.5 MPa.

[0014] More preferably, 1 - 10 wt% of nano-silica is added to the foamed silicone. The addition of nano-silica improves the compactness and wear resistance of the cell structure of the foamed silicone, which is beneficial to improving the sealing performance and durability of the top cover seal and the bottom cover seal.

[0015] Furthermore, it also includes a rubber gasket, which is arranged in the edge area of at least one side of the filter membrane. The pressing plate fixes the filter membrane on the membrane frame through the rubber gasket; the rubber gasket meets at least one of the following conditions: 1) The thickness of the rubber gasket is 0.5 - 1.5 mm, the Shore hardness is 50 - 70 A, and the water absorption rate ≤ 1%; 2) The rubber gasket includes an inner rubber gasket and an outer rubber gasket. The inner rubber gasket is arranged on the side of the filter membrane facing the membrane frame, and the thickness of the inner rubber gasket is 0.5 - 1.2 mm; the outer rubber gasket is arranged on the side of the filter membrane facing the pressing plate, and the thickness of the outer rubber gasket is 0.8 - 1.5 mm; 3) The material of the rubber gasket is selected from at least one of silicone rubber, fluororubber, CR (chloroprene rubber), NBR (nitrile rubber), EPDM (ethylene propylene diene monomer), and IIR (butyl rubber).

[0016] The design of the rubber pad can effectively protect the filter membrane, preventing it from being damaged by the membrane frame, pressing piece or fixing screws during installation and use. Moreover, it provides sufficient friction for fixing the filter membrane and can also enhance the sealing performance of the non-membrane area of the filter component.

[0017] Preferably, the rubber pad is made of silicone rubber to form a solid strip-shaped rubber pad. During use, the rubber pad is stacked between the filter membrane and the membrane frame and / or stacked between the filter membrane and the pressing piece. Alternatively, a rubber pad layer can be preformed on the edge area of the filter membrane by means of coating, impregnation, etc., which not only improves the bonding strength between the rubber pad material and the filter membrane but also avoids damage to the filter membrane caused by offset during subsequent installation, thus affecting the filtering effect and service life.

[0018] Furthermore, the filter membrane comprises a plurality of laminated nylon fiber layers. From the water inlet side to the water outlet side of the membrane frame, the pore sizes of the plurality of nylon fiber layers in the filter membrane gradually decrease. The pore size of the nylon fiber layer on the water inlet side is 80 - 120 mesh, the pore size of the nylon fiber layer on the water outlet side is 280 - 320 mesh, and the pore size of the intermediate nylon fiber layer is greater than 120 mesh and less than 280 mesh.

[0019] Furthermore, the nylon fiber layer on the water inlet side (film-forming surface) is twill weave with 80 - 120 mesh, the intermediate nylon fiber layer is twill weave with a density greater than 120 mesh and less than 280 mesh, and the nylon fiber layer on the water outlet side (clean water surface) is plain weave with 280 - 320 mesh. The twill weave nylon fiber layer placed on the water inlet side has excellent elasticity and ductility, and the relatively loose pores enable a fast film-forming speed; the intermediate twill weave nylon fiber layer is relatively dense, with high wear resistance and strength, and 1 - 3 single layers can be provided in the intermediate layer; the plain weave nylon fiber layer on the water outlet side is more compact and uniform, with moderate wear resistance and strength, strong structural stability and not easy to deform. The filter membrane of the present invention combines different weaving methods while designing the pore size gradient, giving full play to the wear resistance, strength and filtering performance advantages of various woven fiber layers to obtain a filter membrane with excellent comprehensive performance. Moreover, the plurality of nylon fiber layers are preferably woven into an integrated filter membrane through three-dimensional gradient weaving. Through the above-mentioned individual layer and overall design, it can be ensured that both the warp breaking force and the weft breaking force of the nylon fiber membrane of a single filter membrane are above 2200N, and both the warp breaking elongation rate and the weft breaking elongation rate are above 20%. Preferably, the warp breaking force is above 2450N, the warp breaking elongation rate is above 30%, the weft breaking force is above 2500N, and the weft breaking elongation rate is above 25%.

[0020] Furthermore, the nylon fiber layer on the water inlet side contains 1 - 3wt% hydroxylated carbon nanotubes; The surface of the nylon fibers in the nylon fiber layer on the water outlet side has a polytetrafluoroethylene anti-fouling layer, and the polytetrafluoroethylene anti-fouling layer is formed by electrostatic spraying and comprises the following steps: S1: Charge polytetrafluoroethylene microparticles (preferably with a particle size < 50 μm) by means of a high-voltage electrostatic field (e.g., a voltage of 50 - 100 kV). S2: Ground the nylon fiber layer on the water outlet side and preheat it to 60 - 100 °C. S3: Spray and adsorb the polytetrafluoroethylene onto the surface of the nylon fiber to form a polytetrafluoroethylene anti-fouling layer.

[0021] Preferably, the nylon fiber layer on the water outlet side operates at a running speed of 1 - 10 m / min, and the dosage of polytetrafluoroethylene is 5 - 10% of the total mass of the nylon fiber layer on the water outlet side, forming an anti-fouling layer with a thickness of about 1 - 50 μm.

[0022] By means of treatment methods such as modification and spraying, the nylon fiber layer on the water inlet side (outer layer) is easy to form a film, and the nylon fiber layer on the water outlet side (inner layer) is not easily contaminated. Under their combined action, the film-forming time of the dynamic membrane is reduced, the flux operation time is extended, and the chemical cleaning cycle is prolonged. The process of electrostatic spraying to form the polytetrafluoroethylene anti-fouling layer can be implemented separately on the nylon fiber layer on the water outlet side before lamination, or on this nylon fiber layer after lamination.

[0023] In a second aspect, the present invention provides a dynamic membrane module with internal and external collaborative cleaning including the above-mentioned filtration components, comprising: a plurality of said filtration components, an assembly frame, a cleaning aeration system, and a control system; A plurality of said filtration components and the cleaning aeration system are detachably fixed on the assembly frame; The cleaning aeration system includes an air supply pipe and an aeration head with a variable jet direction connected to the air supply pipe; The control system includes a treatment tank detection unit, a filtration membrane detection unit, and a control unit. The control unit controls the aeration head to perform in-tank aeration operations, external cleaning of the filtration components, and / or internal cleaning of the filtration components according to the feedback results of the treatment tank detection unit and / or the filtration membrane detection unit.

[0024] Through the design and optimization of the structural combination, the dynamic membrane module of the present invention integrates functions of filtration, aeration, and intelligent internal and external self-cleaning, and through the detachable installation method of the filtration components, it can flexibly adapt to various application scenarios and treatment intensities, effectively improving the versatility and maintenance convenience of the equipment.

[0025] Furthermore, the dynamic membrane module includes a plurality of filtration components arranged in parallel on the assembly frame, and the filtration membranes of the filtration components satisfy at least one of the following conditions: 1) Each filtration membrane includes a plurality of laminated nylon fiber layers, and the pore sizes of the plurality of nylon fiber layers gradually decrease from the water inlet to the water outlet direction; 2) The nylon fibers in the nylon fiber layer on the water inlet side of the filtration membrane contain hydroxylated carbon nanotubes; 3) The nylon fiber surface of the nylon fiber layer on the outlet side of the filter membrane has a polytetrafluoroethylene anti-fouling layer.

[0026] The present invention arranges a functional filter membrane on the membrane frame, and the aperture gradient design of the multiple nylon fiber layers of the filter membrane is carried out, which is conducive to ensuring the overall anti-fracture ability and anti-deformation ability of the filter membrane. In addition, through treatment means such as modification and spraying, the outer layer is easy to form a film, and the inner layer is not easy to be polluted. Under the joint action, the film forming time of the dynamic membrane is reduced, the large flux operation time is extended, and the chemical cleaning cycle is extended. In particular, when the filter membranes are fixed on the two outer sides of the membrane frame respectively, the inner side surface in the internal space between the two filter membranes is difficult to clean. The use of the existing ordinary filter membrane needs to face a high cleaning frequency. The treated filter membrane shows long-lasting durability and anti-fouling, which significantly reduces the use and maintenance costs. In addition, the filter assembly of the present invention can open the aforementioned internal space by arranging the top opening and the bottom opening on the membrane frame, and cooperate with the aeration head for high-pressure cleaning. The sewage and dirt are discharged from the bottom opening again, which can quickly restore the filter membrane to a better filtering state, further reducing the use and maintenance costs.

[0027] Furthermore, it also includes a driving system and a reset system, wherein the driving system is used to synchronously open a top cover hinged to the top of the membrane frame and a bottom cover hinged to the bottom of the membrane frame to cooperate with the aeration head to clean the inside of the filter assembly from the top opening and the bottom opening; The reset system is used to close the top cover and the bottom cover synchronously or step by step after the interior is cleaned, so as to close the top opening and the bottom opening.

[0028] The driving system and reset system of the present invention have multiple options. Optionally, the driving system can use at least one of motor drive, cylinder drive, and hydraulic drive to provide driving force, and cooperate with pulley drive, gear drive, screw drive and other transmission methods to provide opening force to the top cover and the bottom cover. The reset system can adopt a configuration similar to the driving system, or simply use a spring structure to drive the top cover and the bottom cover using the elastic reset force of the spring. Through the coordinated cooperation of the driving system and the reset system, automatic cleaning is achieved, and the thoroughness of cleaning and the maintenance efficiency of the equipment are improved. When multiple filter assemblies are set on the assembly rack, the top covers and bottom covers of the multiple filter assemblies can be linked to open or close.

[0029] In a third aspect, using the aforementioned dynamic membrane module, the present invention also provides a method for coordinated cleaning of the inside and outside of a dynamic membrane module, comprising the following steps: S1. Real-time detection of at least one parameter of the treatment pool water parameter, the treatment pool liquid level, the filter membrane effluent turbidity, the filter membrane flux, and the filter membrane pressure difference; S2. According to the detection result, the control unit controls the dynamic membrane module to enter at least one of the following operation modes: (1) Aeration mode in the pool; (2) External cleaning mode of the filtration component; (3) Internal cleaning mode of the filtration component.

[0030] The method for collaborative cleaning inside and outside the dynamic membrane module provided by the present invention realizes precise triggering and dynamic collaborative cleaning by real-time detecting various data such as water body parameters and liquid level in the treatment pool, and the control unit intelligently selects mode switching according to the detection results. This method can match the optimal cleaning strategy for different pollution types, effectively improve the membrane flux recovery rate, extend the service life of the membrane module, while reducing energy consumption and maintenance costs, which can kill multiple birds with one stone.

[0031] The beneficial effects of the above technical solutions of the present invention at least include: (1) The present invention adopts a filter membrane sheet with excellent mechanical properties and an integral laminated structure, combined with a stainless steel pressing sheet and a membrane frame, making the surface of the filter membrane sheet flatter, and there will be no phenomenon of concave or convex due to water flow scouring during operation, forming a filter component with both high filtration performance and high mechanical properties. And through the pore size gradient design of the filter membrane sheet and the preferred functionalization treatment of the double-sided nylon fiber layer, it is beneficial to ensure the filtration effect while extending the regeneration cycle and reducing the cleaning frequency, overall improving the durability of the filter component and reducing the operation cost.

[0032] (2) The top opening connecting the internal and external environments of the membrane frame provided on the top border of the membrane frame, and the bottom opening connecting the internal and external environments of the membrane frame provided on the bottom border of the present invention realize the internal and external penetration of the membrane frame in the vertical direction. High-pressure water flow enters the internal space of the membrane frame from the top opening and / or the bottom opening to perform internal cleaning on the inner sides of the two filter membrane sheets facing each other, and the sewage and dirt after internal cleaning flow out from the bottom opening. Without removing each filter component and without disassembling the filter membrane sheet, the cleaning of the inner and outer sides of each filter membrane sheet can be completed. On this basis, the distance between the membrane sheets can also be reduced, and more filter components can be accommodated on the assembly rack under the same space, improving the treatment capacity and treatment efficiency of the dynamic membrane module.

[0033] (3) On the basis of the membrane frame, filter membrane sheet, and pressing sheet, the present invention also correspondingly sets foamed latex seals on the inner surfaces of the top cover and the bottom cover, which are used for effectively sealing the top opening and the bottom opening during the filtration operation, improving the filtration effect of the filter component. And an inner rubber pad facing the side of the membrane frame and / or an outer rubber pad facing the pressing sheet are provided in the side edge area of the filter membrane sheet, which are used for protecting the edge area of the filter membrane sheet, especially beneficial for preventing the filter membrane sheet from being damaged by the membrane frame, pressing sheet or fixing screws during installation and use.

[0034] (4)The filtration component of the present invention can be integrated with a cleaning and aeration system, a control system, etc. into a dynamic membrane module. The intelligent control system monitors the water body parameters in the treatment tank and the state parameters of the filter membrane in real time, and switches the cleaning mode according to the detection results, taking into account the realization of in-tank aeration and coordinated cleaning inside and outside the filtration component, dynamically and comprehensively improving the cleaning effect and enhancing the degree of cleaning intelligence and pertinence. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic structural diagram of the filtration component of the present invention; Figure 2 is a schematic structural diagram of the upper part of the membrane frame of the present invention; Figure 3 is a schematic structural diagram of the lower part of the membrane frame of the present invention; Figure 4 is a schematic structural diagram of each nylon fiber layer in the filter membrane of the present invention; Figure 5 is a schematic structural diagram of the dynamic membrane module of the present invention.

[0036] Description of the reference numerals in the drawings: 1 - top cover, 2 - bottom cover, 3 - membrane frame, 4 - filter membrane, 5 - rubber gasket, 6 - assembly frame, 7 - air supply pipe, 9 - drive system, 9.1 - upper linkage, 9.2 - lower linkage, 10 - reset system, 11 - pressing piece, 1.1 - top cover seal, 2.1 - bottom cover seal, 3.1 - top opening of the membrane frame, 3.2 - bottom opening of the membrane frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to better understand the above technical solutions, the following will describe the above technical solutions in detail in conjunction with the accompanying drawings of the specification and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0039] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0040] As Figures 1-5 shown, the dynamic membrane module for internal and external collaborative cleaning provided by the present invention includes a number of filter components that can be cleaned internally and externally, an assembly frame 6, a cleaning aeration system, a control system, etc., specifically including: (1) Filter components that can be cleaned internally and externally, a membrane frame 3, filter membrane sheets 4, pressing sheets 11, optional top cover seals 1.1 and bottom cover seals 2.1, and rubber pads 5. The specific structure is as follows: (1.1) Membrane frame 3, see appendix Figures 1-3 , preferably made of stainless steel, having a top opening 3.1 on the top border and a bottom opening 3.4 on the bottom border. The top opening 3.1 and the bottom opening 3.2 connect the internal space enclosed by the membrane frame and the filter membrane sheet 4 with the external environment. The membrane frame 3 also has a top cover 1 hinged to the top of the membrane frame 3 and a bottom cover 2 hinged to the bottom, and the top cover 1 and the bottom cover 2 can rotate to open and close the top opening 3.1 / bottom opening 3.2 of the membrane frame; (1.2) Filter membrane sheets 4, each filter component has at least two filter membrane sheets 4. Among them, one filter membrane sheet 4 is fixed on each of the two outer sides of the membrane frame 3. Each filter membrane sheet 4 includes a plurality of laminated nylon fiber layers. From the water inlet side to the water outlet side of the membrane frame 3 (along the thickness direction of the filter membrane sheet 4), the pore diameters of the plurality of nylon fiber layers in the filter membrane sheet gradually decrease. See appendix Figure 4 : a. Water inlet side nylon fiber layer, with a pore diameter of 80 - 120 mesh. Preferably, the film-forming surface on the water inlet side is twill warp; the water inlet side nylon fiber layer preferably contains 1 - 3 wt% hydroxylated carbon nanotubes to increase the surface Zeta potential of the material, promote the adsorption of positively charged bacterial colloids, and reduce the dynamic membrane formation time; b. Intermediate nylon fiber layer, with a pore diameter greater than 120 mesh and less than 280 mesh. Preferably, the intermediate layer is twill, and more preferably 1 - 3 single layers are used. When multiple single layers are used, from the water inlet side to the water outlet side, the pore diameters of each single layer decrease in sequence; c. Water outlet side nylon fiber layer, with a pore diameter of 280 - 320 mesh. Preferably, the clear water surface on the water outlet side is plain weave; the water outlet side nylon fiber layer preferably contains a polytetrafluoroethylene anti-fouling layer formed by electrostatic spraying to improve the anti-fouling performance of the material.

[0041] The warp breaking force and weft breaking force of the nylon fiber membrane of a single filter membrane sheet are both above 2200N, and the warp breaking elongation and weft breaking elongation are both above 20%. Preferably, the warp breaking force is above 2450N, the warp breaking elongation is above 30%, the weft breaking force is above 2500N, and the weft breaking elongation is above 25%.

[0042] (1.3) Pressing plate 11, see attached Figures 2-3 , preferably made of stainless steel. The pressing plate has a plurality of mounting holes corresponding to the membrane frame for screwing in fixing screws to squeeze and fix the pressing plate together with the filter membrane sheet on the side of the membrane frame.

[0043] (1.4) Rubber gasket 5, see attached Figure 3 , arranged in the edge area of at least one side of the filter membrane sheet 4. The pressing plate 11 fixes the filter membrane sheet 4 on the membrane frame 3 through the rubber gasket 5; the rubber gasket 5 satisfies at least one of the following conditions: 1) The thickness of the rubber gasket 5 is 0.5 - 1.5mm, the Shore hardness is 50 - 70A, and the water absorption rate ≤ 1%; 2) The rubber gasket 5 includes an inner rubber gasket and an outer rubber gasket. The inner rubber gasket is arranged on the side of the filter membrane sheet 4 facing the membrane frame 3, and the thickness of the inner rubber gasket is 0.5 - 1.2mm; the outer rubber gasket is arranged on the side of the filter membrane sheet 4 facing the pressing plate 11, and the thickness of the outer rubber gasket is 0.8 - 1.5mm; 3) The material of the rubber gasket 5 is selected from at least one of silicone rubber, fluororubber, CR (chloroprene rubber), NBR (nitrile rubber), EPDM (ethylene propylene diene monomer rubber), IIR (butyl rubber).

[0044] An inner rubber gasket facing the side of the membrane frame and an outer rubber gasket facing the pressing plate are arranged in the edge area of both sides of the filter membrane sheet 4. The pressing plate 11 fixes the outer rubber gasket, the filter membrane sheet 4, and the inner rubber gasket together on the outer side of the membrane frame 3, where: Inner rubber gasket, with a thickness of 0.5 - 1.2mm, Shore hardness of 50 - 70A, water absorption rate ≤ 1%, and preferably made of silicone rubber pad; Outer rubber gasket, with a thickness of 0.8 - 1.5mm, Shore hardness of 50 - 70A, water absorption rate ≤ 1%, the same material as the inner rubber gasket, or other rubbers can also be used.

[0045] (1.5) Top cover seal 1.1 / bottom cover seal 2.1, see attached Figures 1-3, to ensure the tightness of the filtration component, a top cover seal 1.1 is provided on the inner surface of the top cover 1 facing the top of the membrane frame 3, and a bottom cover seal 2.1 is provided on the inner surface of the bottom cover 2 facing the bottom of the membrane frame 3. When the top cover 1 and the bottom cover 2 close the top / bottom of the membrane frame 3, they are used to fill the gaps between the membrane frames 3, better sealing the top opening 3.1 / bottom opening 3.2. The top cover seal 1.1 and the bottom cover seal 2.1 meet at least one of the following conditions: 1) The thickness is 1 - 5 mm, and the foaming density is 0.1 - 0.6 g / m 3 ; 2) The tear strength is above 3 KN / m, and the elongation rate is above 200%; 3) It includes foamed latex, selected from at least one of foamed silicone, foamed EPDM, foamed EVA, foamed PU, foamed CR (neoprene), and foamed NBR (nitrile rubber).

[0046] (2) The assembly frame 6 is used to detachably fix equipment such as the filtration component and the cleaning aeration system to form an integrated dynamic membrane module, and is convenient for the use and maintenance of each equipment; (3) The cleaning aeration system includes an air supply pipe 7 and an aeration head with a variable spraying direction; (4) The control system includes a treatment tank detection unit, a filter membrane detection unit, and a control unit. The control unit controls the aeration head to perform in-tank aeration operations, external cleaning of the filtration component, and internal cleaning of the filtration component according to the feedback results of the treatment tank detection unit and the filter membrane detection unit; (5) The drive system 9 is used to synchronously open the top cover 1 hinged to the top of the membrane frame 3 and the bottom cover 2 hinged to the bottom of the membrane frame of each filtration component, so as to cooperate with the aeration head to clean the inside of the filtration component from the top opening 3.1 and / or the bottom opening 3.2, and discharge the sewage and dirt from the opened bottom opening 3.2 during the internal cleaning; Optionally, the power equipment of the drive system can use at least one of motor drive, cylinder drive, and hydraulic drive to provide driving force, and cooperate with transmission methods such as pulley drive, gear drive, and screw drive to provide an opening force to the top cover and the bottom cover. When there are multiple filtration components, linkage parts can be set to synchronously open multiple top covers 1 and / or synchronously open multiple bottom covers 2; (6) The reset system 10 is used to synchronously or stepwise close the top cover 1 and the bottom cover 2 after the internal cleaning is completed, so as to close the top opening 3.1 and the bottom opening 3.2. The reset system can adopt a configuration similar to that of the drive system, and preferably uses a spring structure to provide a restoring force.

[0047] Preferably, as Figure 5As shown in the figure, taking the dynamic membrane module without a filter membrane as an example, the driving system, the reset system, etc. and their automated working processes are demonstrated. The driving device of the driving system 9 drives the linkage members, driving each top cover 1 and each bottom cover 2 to open synchronously. The reset system cooperates with this to achieve automated operations before and after cleaning. The driving and reset operation methods include but are not limited to the following: The driving system 9 includes a power device, an upper linkage member 9.1 connected to each top cover 1, and a lower linkage member 9.2 connected to each bottom cover 2. The power device includes a motor fixed on the assembly frame 6 and a telescopic rod driven by the motor. The free end of the telescopic rod fixes a transmission rope. The transmission rope extends downward around the top fixed pulley and is fixed to the upper linkage member 9.1. Further extending downward and then around the bottom fixed pulley, it extends upward and is fixed to the lower linkage member 9.2. The top fixed pulley is fixed at the top of the assembly frame 6, and the bottom fixed pulley is fixed at the bottom of the assembly frame 6.

[0048] When driving to open each top cover 1 and each bottom cover 2, the power device contracts the telescopic rod, and the transmission rope makes the upper linkage member 9.1 move upward, opening each top cover 1 relative to the top of the membrane frame 3; the transmission rope further uses the turning action of the bottom fixed pulley to synchronously drive the lower linkage member 9.2 to move downward, opening each bottom cover 2 relative to the bottom of the membrane frame 3.

[0049] The reset system 10 includes a top cover spring and a bottom cover spring. One end of the top cover spring is connected to the inner side of the top cover 1, and the other end is fixed on the membrane frame 3 or on the support member of the membrane frame 3. The fixed position is preferably lower than the top of the membrane frame 3 to provide sufficient elastic deformation and restoring force. When the top cover 1 is opened by the power loaded by the driving system 9, the top cover spring is stretched to accumulate the restoring force. When the driving system 9 unloads the driving force, the restoring force of the top cover spring pulls the top cover 1 towards the top of the membrane frame 3 to close the top opening. Similarly, one end of the bottom cover spring is connected to the inner side of the bottom cover 2, and the other end is fixed on the membrane frame 3 or on the support member of the membrane frame 3. The fixed position is preferably higher than the bottom of the membrane frame 3. And considering that the telescopic movement of the spring is likely to wear or damage the filter membrane, at the position where it may contact the filter membrane, a soft rope can be preferably used for connection, that is, a structure combining a rope and a spring is used to provide the reset drive. See the appendix Figure 3 .

[0050] Using the above dynamic membrane module, during or step by step with the aeration operation in the pool, the internal and external collaborative cleaning operation of the dynamic membrane module can also be achieved. The process is as follows: S1. Detect at least one of the parameters such as the water body parameters, liquid level, effluent turbidity of the filter membrane, membrane flux, and membrane pressure difference in the treatment pool in real time; S2. According to the detection results, the control unit controls the dynamic membrane module to switch the operation mode to perform aeration in the pool or clean the inside / outside of the filter component.

[0051] To further illustrate the present invention, the filter assembly capable of internal and external cleaning, the dynamic membrane module, and the internal and external collaborative cleaning method provided by the present invention will be described in detail below in conjunction with embodiments:

[0052] Example 1 The filter assembly capable of internal and external cleaning in Embodiment 1 includes a membrane frame 3, filter membrane sheets 4, pressing sheets 11, a top cover seal 1.1, a bottom cover seal 2.1, and rubber pads 5. The specific structure is as follows: (1.1) The membrane frame 3 is made of stainless steel. It has a top opening 3.1 on the top border and a bottom opening 3.4 on the bottom border. The top opening 3.1 and the bottom opening 3.2 communicate the internal space enclosed by the membrane frame and the filter membrane sheet 4 with the external environment. The membrane frame 3 also has a top cover 1 hinged to the top of the membrane frame 3 and a bottom cover 2 hinged to the bottom. The top cover 1 and the bottom cover 2 can be rotated to open and close the top opening 3.1 and the bottom opening 3.2 of the membrane frame respectively; (1.2) For the filter membrane sheet 4, one filter membrane sheet 4 is fixed on each of the two outer sides of the membrane frame 3 in the filter assembly through a pressing sheet 11. Each filter membrane sheet 4 includes 3 nylon fiber layers integrally woven in a three-dimensional gradient. Along the thickness direction of the filter membrane sheet 4, it sequentially includes: a. The nylon fiber layer on the water inlet side, with a heddle count of 100 meshes; b. The middle nylon fiber layer, with a twill count of 200 meshes; d. The nylon fiber layer on the water outlet side, with a plain weave count of 300 meshes.

[0053] The warp breaking force of a single filter membrane sheet is about 2750 N, the warp breaking elongation rate is about 36%, the weft breaking force is about 2850 N, and the weft breaking elongation rate is about 27.5%.

[0054] (1.3) The pressing sheet 11 is made of stainless steel. The pressing sheet has a plurality of mounting holes corresponding to the membrane frame for screwing in fixing screws to squeeze and fix the pressing sheet together with the filter membrane sheet on the side of the membrane frame.

[0055] (1.4) The rubber pad 5 is made of silicone rubber, with a thickness of 1.0 mm, a Shore hardness of about 60 A, and a water absorption rate ≤ 1%. It is set in the side edge area of the filter membrane sheet 4 facing the pressing sheet 11. The pressing sheet 11 fixes the filter membrane sheet 4 on the membrane frame 3 through the rubber pad 5.

[0056] (1.5) Top cover seal 1.1 and bottom cover seal 2.1. The top cover seal 1.1 is provided on the inner surface of the top cover 1 facing the top of the membrane frame 3, and the bottom cover seal 2.1 is provided on the inner surface of the bottom cover 2 facing the bottom of the membrane frame 3. When the top cover 1 and the bottom cover 2 close the membrane frame 3, they are used to fill the pores between the membrane frames 3 to better seal the top opening 3.1 and the bottom opening 3.2. The top cover seal 1.1 and the bottom cover seal 2.1 are made of foamed silica gel with a thickness of 2.5 mm and a foaming density of about 0.4 g / m 3 , and the tear strength is about 4.5 KN / m, and the elongation rate is more than 400%.

[0057] (1.6) Reset system 10, including a top cover spring and a bottom cover spring. One end of the top cover spring is connected to the inner side of the top cover 1, and the other end is fixed on the support of the membrane frame 3 at a position lower than the top of the membrane frame 3, providing sufficient elastic deformation and restoring force. When the top cover 1 is opened, the top cover spring is stretched to accumulate the restoring force. When the top cover 1 returns, the restoring force of the top cover spring pulls the top cover 1 towards the top of the membrane frame 3 to close the top opening. Similarly, one end of the bottom cover spring is connected to the inner side of the bottom cover 2, and the other end is fixed on the support of the membrane frame 3 at a position higher than the bottom of the membrane frame 3. Also, considering that the telescopic movement of the spring is likely to wear or damage the filter membrane, at the position where it may contact the filter membrane, a soft rope is used for connection, that is, a structure combining a rope and a spring is used to provide the reset drive. See the attached Figure 3 .

[0058] Example 2 The difference between the filter assembly that can be cleaned inside and outside in Embodiment 2 and that in Embodiment 1 is that the filter membrane in Embodiment 2 is functionally treated and sequentially includes, along the thickness direction of the filter membrane 4: a. An inlet-side nylon fiber layer with a twill of 100 meshes. The nylon fibers in the inlet-side nylon fiber layer contain about 1.5 wt% hydroxylated carbon nanotubes; b. An intermediate nylon fiber layer with a twill of 200 meshes; c. An outlet-side nylon fiber layer with a plain weave of 300 meshes. The surface of the nylon fibers in the outlet-side nylon fiber layer has a polytetrafluoroethylene anti-fouling layer. The polytetrafluoroethylene anti-fouling layer is formed by electrostatic spraying and includes the following steps: S1: Charge the polytetrafluoroethylene particles (screened with a particle size of about 30 μm or less) through a 75 kV high-voltage electrostatic field; S2: Ground the outlet-side nylon fiber layer and preheat it to 80 ± 2 °C; S3: The outlet-side nylon fiber layer runs at a running speed of 5 m / min, and the polytetrafluoroethylene is sprayed and adsorbed on the surface of the nylon fibers to form a polytetrafluoroethylene anti-fouling layer. The dosage of polytetrafluoroethylene is 6% of the total mass of the outlet-side nylon fiber layer, and the thickness of the anti-fouling layer formed is about 25 ± 5 μm.

[0059] The warp breaking force of a single filter membrane is approximately 2810 N, the warp breaking elongation rate is approximately 32.3%, the weft breaking force is approximately 2900 N, and the weft breaking elongation rate is approximately 26.0%.

[0060] Example 3 The difference between the filter assembly that can be cleaned inside and outside in Example 3 and that in Example 2 is that the rubber pads in Example 3 use inner rubber pads and outer rubber pads, including: The rubber pads include inner and outer rubber pads made of silicone rubber. The inner rubber pad is arranged on the side of the filter membrane facing the membrane frame, and the thickness of the inner rubber pad is 0.5 mm; the outer rubber pad is arranged on the side of the filter membrane facing the pressing plate, and the thickness of the outer rubber pad is 1.0 mm.

[0061] Application Example 1 Five groups of the filter assemblies in Example 1 are fixedly arranged in parallel on the assembly rack of the dynamic membrane module. The dynamic membrane module includes: filter assemblies, an assembly rack, a cleaning and aeration system, a control system, a driving system, and a reset system.

[0062] The assembly rack detachably fixes equipment such as the filter assemblies and the cleaning and aeration system to form an integral dynamic membrane module; The cleaning and aeration system includes an air supply pipe and an aeration head with a variable jet direction. The air supply pipe includes an air supply main pipe and air supply branch pipes branched from the air supply main pipe. The air supply branch pipes are arranged at the upper and lower parts of the assembly rack and are arranged corresponding to each filter assembly. Three aeration heads are arranged on each air supply branch pipe, corresponding to the three top openings and three bottom openings of the filter assembly respectively. When the jet direction of the aeration head changes, other positions can also be cleaned and the pool can be aerated.

[0063] The control system includes a treatment tank detection unit, a filter membrane detection unit, and a control unit. The control unit controls the aeration head to perform in-pool aeration operations, external cleaning of the filter assembly, and internal cleaning of the filter assembly according to the feedback results of the treatment tank detection unit and the filter membrane detection unit; A drive system is used to synchronously open each top cover and bottom cover to cooperate with the aeration head to clean the opposite inner sides of the filter assembly from the top opening and the bottom opening, and discharge the sewage and dirt from the internal cleaning through the opened bottom opening. The drive system includes a power device, an upper linkage connected to each top cover, and a lower linkage connected to each bottom cover. The power device includes a motor fixed on the assembly frame and a telescopic rod driven by the motor. The free end of the telescopic rod fixes a transmission rope. The transmission rope extends downward around the top fixed pulley and is fixed to the upper linkage. After further extending downward and bypassing the bottom fixed pulley, it extends upward and is fixed to the lower linkage. The top fixed pulley is fixed at the top of the assembly frame, and the bottom fixed pulley is fixed at the bottom of the assembly frame. When driving to open each top cover and each bottom cover, the power device contracts the telescopic rod, and the transmission rope makes the upper linkage move upward to open each top cover relative to the top of the membrane frame; the transmission rope further uses the turning action of the bottom fixed pulley to synchronously drive the lower linkage to move downward to open each bottom cover relative to the bottom of the membrane frame.

[0064] A reset system uses a spring structure to provide a restoring force, including a top cover spring and a bottom cover spring. One end of the top cover spring is connected to the inner side of the top cover, and the other end is fixed on the support member of the membrane frame at a position lower than the top of the membrane frame. One end of the bottom cover spring is connected to the inner side of the bottom cover, and the other end is fixed on the support member of the membrane frame at a position higher than the bottom of the membrane frame. When the top cover and the bottom cover are opened by the power loaded by the drive system, the top cover spring is stretched to accumulate the restoring force. After the internal cleaning is completed, the drive system unloads the driving force, and the restoring force of the top cover spring pulls the top cover towards the top of the membrane frame to close the top opening, and the restoring force of the bottom cover spring pulls the bottom cover towards the bottom of the membrane frame to close the bottom opening.

[0065] The dynamic membrane module can provide an internal and external collaborative cleaning method, including the following steps: S1. Real-time detect at least one parameter among the water body parameters of the treatment tank, the liquid level of the treatment tank, the effluent turbidity of the filter membrane, the membrane flux of the filter membrane, and the membrane pressure difference of the filter membrane. S2. According to the detection results, the control unit controls the dynamic membrane module to enter at least one of the following operation modes: (1) In-pool aeration mode, the top cover and the bottom cover of the filter assembly are in a closed state, and the aeration head sprays aeration into the pool. (2) External cleaning mode of the filter assembly, the top cover and the bottom cover of the filter assembly are in a closed state, and the aeration head sprays to wash the membrane frame and the outer side of the filter assembly. (3) Internal cleaning mode of the filter assembly, the top cover and the bottom cover of the filter assembly are in an open state, and the aeration head sprays into the internal space of the membrane frame from the top opening and the bottom opening respectively and washes the inner side of each filter membrane. The washing sewage and dirt are discharged from the bottom opening, and the top cover and the bottom cover are closed after the cleaning is completed.

[0066] Application Examples 2-3 Application Examples 2 and 3 have the same overall structure as the entire application example, except that: in Application Example 2, 5 sets of the filter components of Example 2 are fixedly arranged in parallel on the assembly rack of the dynamic membrane module; in Application Example 3, 5 sets of the filter components of Example 3 are fixedly arranged in parallel on the assembly rack of the dynamic membrane module.

[0067] The dynamic membrane module samples of Application Examples 1 - 3 are simultaneously placed in the aerobic tank for normal operation. On the 31st day, the filtration membrane detection unit of Application Example 1 feeds back that the water turbidity < 10 NTU, and the internal cleaning mode of the filter component of Application Example 1 is started; on the 38th day, the filtration membrane detection unit of Application Example 2 feeds back that the water turbidity < 10 NTU, and the internal cleaning mode of the filter component of Application Example 2 is started; on the 40th day, the filtration membrane detection unit of Application Example 3 feeds back that the water turbidity < 10 NTU, and the internal cleaning mode of the filter component of Application Example 3 is started. Within one quarter (3 months), the internal cleaning of Application Example 1 is carried out 3 times, and the internal cleaning of Application Examples 2 and 3 is carried out 2 times. After opening each dynamic membrane module for inspection, it is found that among the 10 filtration membranes of Application Example 1, 3 filtration membranes show slight unevenness; among the 10 filtration membranes of Application Example 2, 2 filtration membranes show slight unevenness; the surfaces of the 10 filtration membranes of Application Example 3 remain flat, without the phenomenon of concave or convex due to water flow scouring.

[0068] Improving the durability, fouling resistance and easy cleanability of the filtration membrane, combined with a stable assembly method and an automatic detection and control system, are important factors for the dynamic membrane module to balance high filtration performance, easy cleaning, stable durability and intelligent low - cost operation.

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and variations.

Claims

1. A filter component capable of being cleaned inside and outside, characterized in that, The filtering component includes: a membrane frame (3), a filtering membrane sheet (4), and a pressing sheet (11); The pressing sheet (11) fixes the filtering membrane sheets (4) on two outer side surfaces of the membrane frame (3) respectively, so that the filtering membrane sheets (4) and the membrane frame (3) jointly enclose an internal space; The membrane frame has a top opening (3.1) and a bottom opening (3.2) communicating with the internal space, and is used for cleaning the inner side surfaces opposite to the filtering membrane sheets (4); The filtering membrane sheet (4) includes a nylon fiber membrane, the pore size of the nylon fiber membrane is 50 mesh to 350 mesh, the warp breaking force and the weft breaking force are both above 2200 N, and the warp breaking elongation rate and the weft breaking elongation rate are both above 20%.

2. The filtering component according to claim 1, wherein The membrane frame (3) includes a top cover (1) hinged to the top of the membrane frame, and a bottom cover (2) hinged to the bottom of the membrane frame; The top cover (1) rotates to open or close the top opening (3.1), and the bottom cover (2) rotates to open or close the bottom opening (3.2).

3. The filtering component according to claim 2, characterized in that, A top cover seal (1.1) is provided on the inner surface of the top cover (1) facing the top of the membrane frame (3), and / or a bottom cover seal (2.1) is provided on the inner surface of the bottom cover (2) facing the bottom of the membrane frame (3); The top cover seal (1.1) and the bottom cover seal (2.1) meet at least one of the following conditions: 1) The thickness is 1 - 5 mm, and the foaming density is 0.1 - 0.6 g / m 3 ; 2) The tear strength is above 3 kN / m, and the elongation rate is above 200%; 3) It includes foamed latex, and is selected from at least one of foamed silica gel, foamed EPDM, foamed EVA, foamed PU, foamed CR, and foamed NBR.

4. The filter component according to any one of claims 1-3, characterized in that, It further includes a rubber gasket (5), which is arranged in the edge area of at least one side surface of the filtering membrane sheet (4), and the pressing sheet (11) fixes the filtering membrane sheet (4) on the membrane frame (3) through the rubber gasket (5); the rubber gasket (5) meets at least one of the following conditions: 1) The thickness of the rubber gasket (5) is 0.5 - 1.5 mm, the Shore hardness is 50 - 70 A, and the water absorption rate ≤ 1%; 2) The rubber gasket (5) includes an inner rubber gasket and an outer rubber gasket. The inner rubber gasket is arranged on the side surface of the filtering membrane sheet (4) facing the membrane frame (3), and the thickness of the inner rubber gasket is 0.5 - 1.2 mm; the outer rubber gasket is arranged on the side surface of the filtering membrane sheet (4) facing the pressing sheet (11), and the thickness of the outer rubber gasket is 0.8 - 1.5 mm; 3) The material of the rubber gasket (5) is selected from at least one of silicone rubber, fluororubber, CR, NBR, EPDM, and IIR.

5. The filtering component according to any one of claims 1 to 3, characterized in that, The filtering membrane sheet (4) includes a plurality of laminated nylon fiber layers. From the water inlet side to the water outlet side of the membrane frame (3), the pore sizes of the plurality of nylon fiber layers in the filtering membrane sheet gradually decrease. The pore size of the nylon fiber layer on the water inlet side is 80 - 120 mesh, the pore size of the nylon fiber layer on the water outlet side is 280 - 320 mesh, and the pore size of the intermediate nylon fiber layer is greater than 120 mesh and less than 280 mesh.

6. The filter component according to claim 5, wherein, The nylon fiber layer on the water inlet side contains 1 - 3 wt% hydroxylated carbon nanotubes; The surface of the nylon fiber of the nylon fiber layer on the water outlet side has a polytetrafluoroethylene anti-fouling layer, and the polytetrafluoroethylene anti-fouling layer is formed by electrostatic spraying, and includes the following steps: S1: Charging the polytetrafluoroethylene particles through a high-voltage electrostatic field; S2: The nylon fiber layer on the water outlet side is grounded and preheated; S3: Polytetrafluoroethylene is sprayed and adsorbed onto the surface of nylon fibers to form a polytetrafluoroethylene anti-fouling layer.

7. A dynamic membrane module with internal and external collaborative cleaning having a filtration component as described in any one of claims 1-6, characterized in that, Including: A plurality of said filter components, an assembly rack (6), a cleaning aeration system, and a control system; A plurality of said filter components and the cleaning aeration system are detachably fixed on the assembly rack (6); The cleaning aeration system includes an air supply pipe (7) and an aeration head with a variable jet direction connected to the air supply pipe; The control system includes a treatment tank detection unit, a filter membrane detection unit, and a control unit. The control unit controls the aeration head to perform in-tank aeration operations, external cleaning of the filter components, and / or internal cleaning of the filter components according to the feedback results of the treatment tank detection unit and / or the filter membrane detection unit.

8. The dynamic membrane module according to claim 7, characterized in that, The dynamic membrane module includes a plurality of filter components arranged in parallel on the assembly rack (6). The filter membranes (4) of the filter components satisfy at least one of the following conditions: 1) Each filter membrane (4) includes a plurality of laminated nylon fiber layers. From the water inlet to the water outlet direction, the pore sizes of the plurality of nylon fiber layers gradually decrease; 2) The nylon fibers in the nylon fiber layer on the water inlet side of the filter membrane contain hydroxylated carbon nanotubes; 3) The surface of the nylon fibers in the nylon fiber layer on the water outlet side of the filter membrane has a polytetrafluoroethylene anti-fouling layer.

9. The dynamic membrane module according to claim 7 or 8, characterized in that, It further includes a driving system (9) and a reset system (10). The driving system (9) is used to synchronously open the top cover (1) hinged to the top of the membrane frame (3) and the bottom cover (2) hinged to the bottom of the membrane frame to cooperate with the aeration head to clean the inside of the filter components from the top opening (3.1) and the bottom opening (3.2); The reset system (10) is used to synchronously or stepwise close the top cover (1) and the bottom cover (2) after the internal cleaning is completed to close the top opening (3.1) and the bottom opening (3.2).

10. An internal and external collaborative cleaning method for the dynamic membrane module according to any one of claims 7-9, comprising the following steps: S1. Real-time detect at least one parameter among the water body parameters of the treatment tank, the liquid level of the treatment tank, the turbidity of the water outlet of the filter membrane (4), the membrane flux of the filter membrane (4), and the membrane pressure difference of the filter membrane (4); S2. According to the detection results, the control unit controls the dynamic membrane module to enter at least one of the following operation modes: (1) In-tank aeration mode; (2) External cleaning mode of the filter components; (3) Internal cleaning mode of the filter components.

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