A flexible flat-sheet membrane wastewater treatment device

Abstract

This invention provides a flexible flat-sheet membrane wastewater treatment device, relating to the field of microbial wastewater treatment technology. It includes a biological treatment tank, several flexible flat-sheet membrane elements, several aeration elements, and a water collection assembly. By placing the aeration elements below the flexible flat-sheet membrane elements, the invention generates rising air and water flow when the aeration elements are operating. This flow washes over the membrane surface of the flexible flat-sheet membrane elements and provides hydraulic impact force, thereby cleaning the membrane elements, preventing surface clogging, reducing the frequency of manual cleaning, and meeting the normal drainage schedule of the plant.

Description

Technical Field

[0001] This invention relates to the field of biological wastewater treatment technology, specifically to a flexible flat-sheet membrane wastewater treatment device. Background Technology

[0002] With the acceleration of industrialization, the types of wastewater generated during factory production are becoming increasingly complex, covering multiple fields such as textile dyeing and printing wastewater, electroplating wastewater, food processing wastewater, and chemical wastewater. This type of industrial wastewater is typically characterized by high organic matter concentration, high suspended solids content, and significant water quality fluctuations, placing higher demands on the stability and reliability of treatment processes. Membrane bioreactor technology, due to its advantages such as excellent effluent quality, small footprint, and low sludge production, has gradually become one of the mainstream technologies for factory wastewater treatment and reclaimed water reuse.

[0003] Biological treatment tanks, as the core treatment unit, undertake key functions such as degrading organic pollutants and removing nitrogen and phosphorus. Traditional biological treatment tanks typically employ the activated sludge process, using the metabolism of microorganisms to convert organic matter in wastewater into harmless substances. However, with increasingly stringent emission standards, relying solely on biological treatment is insufficient to consistently meet requirements, necessitating its integration with subsequent sludge-water separation units. Against this backdrop, membrane bioreactor (MBR) technology has emerged, directly immersing the membrane separation unit within the biological treatment tank, replacing the traditional secondary sedimentation tank with membrane modules to achieve complete separation of sludge retention time and hydraulic retention time.

[0004] The pollutants in industrial wastewater are complex, especially highly viscous substances and oils, which readily adhere to the membrane surface, forming a filter cake layer that is difficult to remove. Traditional flat sheet membranes cannot effectively deform or oscillate under aeration and scouring, allowing pollutants to accumulate rapidly once attached, leading to a rapid increase in transmembrane pressure. To maintain normal water production, operators must frequently perform manual or chemical cleaning, which not only increases labor intensity and operating costs but also causes production interruptions, disrupting the plant's normal wastewater discharge schedule. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a flexible flat sheet membrane sewage treatment equipment, which solves the problem that sewage treatment systems are prone to clogging, which not only increases labor intensity and operating costs, but also causes production interruptions and affects the normal drainage rhythm of the factory.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A flexible flat sheet membrane wastewater treatment device includes: a biological treatment tank, a plurality of flexible flat sheet membrane elements installed inside the biological treatment tank, a plurality of aeration elements, and a water collection assembly.

[0008] The water collection assembly connects several flexible flat sheet membrane elements, and the aeration elements are distributed in the area below the flexible flat sheet membrane elements to generate rising airflow and water flow, which scour the membrane surface of the flexible flat sheet membrane elements and provide hydraulic impact power.

[0009] The flexible flat sheet membrane element includes:

[0010] The main frame has an open first side and a second side that are opposite to each other. A water collection area is formed inside the main frame. A water outlet is provided on the top of the main frame and communicates with the water collection area. The water outlet of the water outlet is connected to the water collection assembly.

[0011] The filter membrane is provided in two sets, which are respectively arranged on the first side and the second side of the main frame to cover the opening.

[0012] The linkage component is located in the water collection area, and its two ends are respectively connected to two sets of filter membranes.

[0013] Preferably, a mesh frame is fixedly connected to the inner side of the main frame and near the two sets of filter membranes, and the linkage is slidably engaged with the mesh frame.

[0014] Preferably, the space frame is composed of several metal bending springs, and both ends of each metal bending spring are fixedly connected to the inner wall of the main frame.

[0015] Preferably, the linkage component includes: a crossbar, both ends of which are fixedly connected to a connecting plate, the connecting plate being located between the mesh frame and the filter membrane, and an external fastener being fixedly connected to the outside of the connecting plate, the filter membrane being clamped and fixed by the external fastener and the connecting plate.

[0016] Preferably, a limiting part is fixedly provided on the side of the connecting plate facing the grid frame, and the limiting part cooperates with the opening of the grid frame.

[0017] Preferably, the filter membrane forms a protruding part at the connection between the outer fastener and the connecting plate.

[0018] Preferably, a horizontal member is fixedly connected to the inner side of the main frame, and a bistable elastic member is fixedly connected to the horizontal member. The bistable elastic member has a first stable position and a second stable position, and the crossbar is fixedly connected to the bistable elastic member.

[0019] Preferably, the bistable elastic element is an arc-shaped metal sheet, and the two ends of the arc-shaped metal sheet are fixedly connected to the horizontal member, and the middle part of the arc-shaped metal sheet is fixedly connected to the crossbar.

[0020] Preferably, the water outlet component includes: a connecting cylinder fixedly connected to the main frame, a first sealing plate fixedly connected to the top of the connecting cylinder, a water outlet fixedly connected to the first sealing plate, a second sealing plate fixedly connected to the bottom of the connecting cylinder, and a water inlet distribution pipe fixedly connected to the bottom of the second sealing plate.

[0021] The water collection assembly includes: a pipeline system and a pump, wherein the pump is connected to the pipeline system and the branch pipes of the pipeline system are connected to the water outlet.

[0022] Preferably, it further includes: a support member disposed on the side of the main frame, the support member including: a vertical pole, the bottom end of the vertical pole being fixedly connected to the inner bottom of the biological treatment tank, two ear pieces being fixedly connected to the side of the main frame, the vertical pole passing through the ear holes on the two ear pieces, a guide cylinder being slidably disposed on the side of the vertical pole and between the two ear pieces, the guide cylinder being fixed to the vertical pole by fasteners, and elastic rings being fixedly connected to both ends of the guide cylinder;

[0023] It also includes an inner frame and an outer frame. The inner frame is fixedly connected to the inner wall of the main frame, and the outer frame is detachably and fixedly installed with the inner frame. The filter membrane is clamped and fixed by the inner frame and the outer frame.

[0024] This invention provides a flexible flat-sheet membrane wastewater treatment device. It has the following beneficial effects:

[0025] 1. This invention, by placing an aeration element in the lower region of a flexible flat sheet membrane element, generates an upward airflow and water flow when the aeration element is working, which washes the membrane surface of the flexible flat sheet membrane element and provides hydraulic impact force, thereby cleaning the flexible flat sheet membrane element, avoiding clogging of the flexible flat sheet membrane element surface, reducing the frequency of manual cleaning, and meeting the normal drainage rhythm of the factory.

[0026] 2. This invention, by setting a linkage component that runs through the water collection area inside the main frame, with its two ends connected to two sets of filter membranes respectively, allows the following structural design: When the rising water flow generated by the aeration element impacts the left filter membrane, that membrane indents inward, and the displacement and thrust are transmitted to the right filter membrane through the linkage component, driving it to bulge outward; the reverse is also true. This structural design achieves mechanical linkage between the two filter membranes, making the originally independent filter membranes a motion-coupled system. This method utilizes the natural hydraulic fluctuations generated by aeration as the driving force, transforming the hydraulic impact on one side of the membrane surface into coordinated movement of both sides through the linkage component. When the permeability of one side of the membrane surface changes due to pollution, it responds more readily to the hydraulic impact, and its movement is forcibly driven by the linkage component to deform the other side, forming a mutually beneficial cleaning mechanism of "cleaning with clean". Meanwhile, the sliding engagement of the linkage components within the mesh frame openings ensures smooth movement. Furthermore, the clamping structure of the connecting disc and external fasteners creates protrusions on the membrane surface. These protrusions generate localized stress concentrations during membrane movement, further enhancing the pollutant removal effect. Compared to existing technologies, traditional flat-sheet membranes, whether using rigid support plates or flexible membrane sheets, have independent moving units on both sides. The more heavily polluted side can only passively receive aeration and scouring, making it difficult to effectively restore flux. Therefore, this invention, through its linkage structure, creates mechanical coupling between the two membrane surfaces, redistributing hydraulic energy between them and achieving "mutual self-cleaning." This design eliminates the need for an external power source, relying solely on the inherent hydraulic fluctuations within the pool to significantly improve the membrane's anti-fouling ability and flux maintenance time, extend the cleaning cycle, and reduce operation and maintenance costs.

[0027] 3. In this invention, a bistable elastic element is further provided on the linkage component. The bistable elastic element has a first stable position and a second stable position and is fixedly connected to the crossbar. When the water flow generated by the aeration element drives the linkage component to slide, the bistable elastic element is gradually stretched or compressed to store energy. When the linkage component slides to the critical position, the bistable elastic element surpasses the energy peak and jumps to another stable state in an instant, releasing the stored elastic potential energy in a very short time, driving the linkage component to generate accelerated motion, thereby causing the filter membrane to generate strong pulse-like shaking. This invention utilizes the nonlinear mechanical properties of a bistable structure to achieve energy conversion from slow energy storage to instantaneous release, increasing the impact effect and achieving deep self-cleaning. The bistable elastic element has two stable equilibrium positions and an unstable equilibrium point in the middle. When an external force causes it to cross the critical point, the structure spontaneously and rapidly jumps to another stable state. This process is accompanied by the instantaneous release of elastic potential energy, generating a rapid motion much higher than the input speed. In this invention, the slow hydraulic propulsion generated by aeration is converted into rapid shaking of the filter membrane through the critical jump of the bistable elastic element, realizing the amplification of motion speed and the concentrated release of cleaning energy. Compared with existing technologies, conventional aeration flushing is a "continuous" cleaning method. The water flow shear force is relatively stable but it is difficult to peel off the formed dense filter cake layer. Although mechanical cleaning driven by external power can generate strong flushing, it requires additional energy consumption and transmission mechanisms. It can be seen that this invention, through the bistable elastic element, accumulates, converts, and releases the hydraulic energy of aeration itself to form a pulsed, powerful shaking, which can effectively break and peel off stubborn filter cake layers without any external power or control unit. Meanwhile, the automatic reset characteristic of the bistable elastic element enables it to utilize the alternating directions of the naturally existing water flow in the pool to form a self-sustaining oscillation cycle, continuously generating a pulse cleaning effect, which significantly improves the long-term operational stability and anti-fouling ability of the membrane module. Attached Figure Description

[0028] Figure 1 This is an overall schematic diagram of a flexible flat-sheet membrane wastewater treatment device proposed in this invention;

[0029] Figure 2 This is a perspective view of the flexible flat sheet membrane of a flexible flat sheet membrane wastewater treatment device proposed in this invention;

[0030] Figure 3 This is a cross-sectional view of the flexible flat sheet membrane of a flexible flat sheet membrane wastewater treatment device proposed in this invention.

[0031] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0032] Figure 5 This is a three-dimensional schematic diagram of the main frame and mesh structure of the flexible flat sheet membrane in a flexible flat sheet membrane wastewater treatment device proposed in this invention.

[0033] Figure 6 This is a schematic diagram of the installation of the filter membrane in a flexible flat sheet membrane wastewater treatment device proposed in this invention.

[0034] Figure 7 This is a three-dimensional schematic diagram of the linkage component of a flexible flat sheet membrane wastewater treatment device proposed in this invention;

[0035] Figure 8 This is a schematic diagram of the connection of a bistable elastic element in a flexible flat sheet membrane wastewater treatment device proposed in this invention.

[0036] The components include: 1. Biological treatment tank; 2. Flexible flat sheet membrane element; 201. Main frame; 202. Filter membrane; 202a. Protrusion part; 203. Linkage component; 2031. Crossbar; 2032. Connecting plate; 2032a. Limiting part; 2033. External fastener; 2034. Bistable elastic component; 2035. Horizontal component; 204. Support component; 2041. Vertical pole; 2042. Ear; 2043. Guide cylinder; 2044. Elastic ring; 2045. Fastener; 205. Water outlet component; 2051. Connecting cylinder part; 2052. First sealing plate; 2053. Water outlet interface; 2054. Second sealing plate; 2055. Water inlet distribution pipe; 206. Inner frame; 207. Outer frame; 208. Mesh frame; 3. Aeration element; 4. Piping system; 5. Pump component. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1:

[0039] like Figures 1-8 As shown, this embodiment of the invention provides a flexible flat sheet membrane wastewater treatment device, belonging to the field of biological wastewater treatment. Specifically, it performs microbial treatment, aeration treatment, and filtration purification treatment on wastewater in a factory. It includes: a biological treatment tank 1 and several flexible flat sheet membrane elements 2, several aeration elements 3, and a water collection assembly installed inside the biological treatment tank 1.

[0040] like Figure 1As shown, several flexible flat sheet membrane elements 2 are distributed in an array to form a clustered filtration effluent area. Aeration elements 3 are arranged at the bottom of the biological treatment tank 1 and located below the flexible flat sheet membrane elements 2. They are used to generate rising airflow and water flow to scour the membrane surface of the flexible flat sheet membrane elements 2 and provide hydraulic impact power. The water collection assembly connects several flexible flat sheet membrane elements 2 and is used to pump out the purified water filtered by the flexible flat sheet membrane elements 2, which is the effluent part of the flexible flat sheet membrane wastewater treatment equipment.

[0041] Understandably, the specific process of the flexible flat sheet membrane wastewater treatment equipment is as follows: the wastewater generated daily in the factory is guided into the biological treatment tank 1 for a period of time for microbial treatment, and the aeration element 3 is activated periodically to aerate the wastewater, further accelerating the efficiency of microbial treatment; when a certain amount of wastewater accumulates inside the biological treatment tank 1, the water collection component is activated, and the wastewater inside the biological treatment tank 1 is pumped out after being filtered by the flexible flat sheet membrane element 2; and the sludge remaining at the bottom of the biological treatment tank 1 needs to be cleaned every once in a while to ensure that the biological treatment tank 1 has enough space to accommodate wastewater.

[0042] Understandably, during the microbial treatment process, sludge and other impurities settle at the bottom of the biological treatment tank 1. Raising the bottom of the flexible flat sheet membrane element 2 a certain distance from the bottom of the biological treatment tank 1 can prevent sludge accumulation from causing the flexible flat sheet membrane element 2 to clog faster.

[0043] Specifically, the flexible flat sheet membrane element 2 includes: a main frame 201, a water outlet 205, a filter membrane 202, and a linkage component 203.

[0044] The main frame 201 is a frame structure with openings on both sides, having a first side and a second side that are open and opposite to each other. A water collection area is formed inside the main frame 201. A water outlet 205, communicating with the water collection area, is located at the top of the main frame 201. The outlet of the water outlet 205 is connected to a water collection assembly. The water collection assembly draws clean water (water filtered by the flexible flat sheet membrane element 2) from the water collection area through the water outlet 205. Two sets of filter membranes 202 are provided, respectively arranged on the first and second sides of the main frame 201, to cover the openings, thus enabling biological treatment. Wastewater entering the collection area from the treatment tank 1 must be filtered through the filter membrane 202. Clean water is temporarily stored in the collection area for pumping out by the collection components. The linkage 203 is located in the collection area, with its two ends connected to the two sets of filter membranes 202 respectively. The linkage 203 drives the two sets of filter membranes 202 in a coordinated manner. For example, when the rising water flow generated by the aeration element 3 impacts the left filter membrane 202, that membrane 202 indents inward. The displacement and thrust are transmitted to the right filter membrane 202 through the linkage 203, driving the right filter membrane 202 to bulge outward; the reverse is also true. This linkage method increases the operating frequency of the two sets of filter membranes 202, improving the removal effect of pollutants on the filter membranes 202. Moreover, when the permeability of one filter membrane 202 changes due to pollution, it is more responsive to water impact. Its movement is forcibly driven by the linkage 203 to deform the other side, forming a mutually beneficial cleaning mechanism of "clean water carrying turbid water," which can more fully utilize the rising airflow and water flow. It can also be argued that, under the same aeration element operating environment, the filter membrane 202 has a better effect on removing pollutants.

[0045] In one embodiment, a mesh frame 208 is fixedly connected to the inner side of the main frame 201 and near both sets of filter membranes 202. The linkage 203 is slidably engaged with the mesh frame 208. The mesh frame 208 is located inside the filter membrane 202 and is used to elastically support the filter membrane 202 to ensure the stable position distribution of the filter membrane 202. The linkage 203 is slidably engaged with the mesh frame 208 to guide the movement of the linkage 203 and ensure that the movement of the linkage 203 is within a limited range, so that the linkage 203 moves toward the left or right filter membrane 202 and avoids unnecessary movements in other directions.

[0046] In one embodiment, the space frame 208 is composed of a number of metal bending springs, and both ends of each metal bending spring are fixedly connected to the inner wall of the main frame 201.

[0047] Each metal bending spring has an elastic function, providing stable support for the filter membrane 202 while allowing the linkage 203 to impact / push the mesh frame 208 to deform, so that the linkage 203 can move freely under force within a limited range, thereby driving the filter membrane 202 to remove pollutants from the filter membrane 202.

[0048] In one embodiment, the linkage 203 includes: a crossbar 2031, with connecting discs 2032 fixedly connected to both ends of the crossbar 2031. The crossbar 2031 and the connecting discs 2032 can be connected by threads. The connecting discs 2032 are located between the mesh frame 208 and the filter membrane 202. An outer fastener 2033 is fixedly connected to the outside of the connecting disc 2032. The filter membrane 202 is clamped and fixed by the outer fastener 2033 and the connecting disc 2032. The outer fastener 2033 and the connecting disc 2032 can be connected by threads.

[0049] It is understandable that the connecting plate 2032 is located between the mesh frame 208 and the filter membrane 202, and the connecting plate 2032 is supported on the inner side of the filter membrane 202. During the distribution of the filter membrane 202, the connecting plates 2032 corresponding to several linkage components 203 protrude in a dot-like manner to support the filter membrane 202, so that the filter membrane 202 presents a non-planar three-dimensional distribution. This can increase the peeling effect during the process of pollutant peeling (the vibration transmitted by the linkage component 203 is mostly perpendicular to the filter membrane 202. Under planar distribution, the vibration direction is perpendicular to the filter membrane 202, and the peeling effect is not obvious. The three-dimensional distribution has a complex direction distribution and the effect is better).

[0050] The auxiliary filter membrane 202 is fixed using the external fastener 2033. This fixing method is simple and makes it very convenient to replace the filter membrane 202 in the future.

[0051] In one embodiment, a limiting part 2032a is fixedly provided on the side of the connecting plate 2032 facing the grid frame 208, and the limiting part 2032a cooperates with the opening of the grid frame 208.

[0052] It is understood that the mesh frame 208 includes several metal bending springs, and the area between two adjacent metal bending springs forms an opening; the connecting plate 2032 is fixedly provided with a limiting part 2032a on the side facing the mesh frame 208. The design of the limiting part 2032a cooperating with the opening of the mesh frame 208 can ensure that when the connecting plate 2032 is close to the mesh frame 208, the mesh frame 208 can stably and elastically support the connecting plate 2032, and the connecting plate 2032 stably supports the filter membrane 202.

[0053] In one embodiment, the filter membrane 202 has a protrusion 202a at the connection between the outer fastener 2033 and the connecting plate 2032, that is, a plurality of protrusions 202a are distributed on the filter membrane 202 to form a three-dimensional structure, which is beneficial for filtration.

[0054] In one embodiment, a horizontal member 2035 is fixedly connected to the inner side of the main frame 201, and a bistable elastic member 2034 is fixedly connected to the horizontal member 2035. The bistable elastic member 2034 has a first stable position and a second stable position, and the crossbar 2031 is fixedly connected to the bistable elastic member 2034.

[0055] It is understandable that the bistable elastic element 2034 has a first stable position and a second stable position. That is, during the process of the bistable elastic element 2034 moving from the first stable position to the second stable position, there is a force that overcomes the bistable elastic element 2034, and then the bistable elastic element 2034 quickly stabilizes to the second stable position, and vice versa.

[0056] When the water flow generated by the aeration element 3 drives the linkage 203 to slide, the bistable elastic element 2034 is gradually stretched or compressed to store energy. When the linkage 203 slides to the critical position, the bistable elastic element 2034 surpasses the energy peak and instantly jumps to another stable state, releasing the stored elastic potential energy in a very short time. This drives the linkage 203 to produce accelerated motion, thereby causing the filter membrane 202 to produce strong pulse-like vibration. This utilizes the nonlinear mechanical characteristics of the bistable structure to achieve the energy conversion of "slow energy storage - instantaneous release," increasing the impact effect and achieving deep self-cleaning; it achieves efficient deep self-cleaning without adding additional power.

[0057] In one embodiment, the bistable elastic element 2034 is an arc-shaped metal sheet, and the two ends of the arc-shaped metal sheet are fixedly connected to the horizontal member 2035, and the middle part of the arc-shaped metal sheet is fixedly connected to the crossbar 2031.

[0058] The arc-shaped metal sheet is a simple bistable elastic structure. The arc-shaped metal sheet can be oriented towards a first direction for the first stable position, or towards a second direction for the second stable position. When the arc-shaped metal sheet is in a vertical state, that is, close to a plane, it is the critical state between the first stable position and the second stable position.

[0059] In one embodiment, the water outlet component 205 includes: a connecting cylinder portion 2051 fixedly connected to the main frame 201, a first sealing plate 2052 fixedly connected to the top end of the connecting cylinder portion 2051, a water outlet interface 2053 fixedly connected to the first sealing plate 2052, a second sealing plate 2054 fixedly connected to the bottom end of the connecting cylinder portion 2051, and a water inlet distribution pipe 2055 fixedly connected to the bottom of the second sealing plate 2054.

[0060] The distribution design of the inlet distribution pipe 2055 can guide purified water from all parts of the water collection area into the outlet component 205, so that the water flow resistance in all parts of the water collection area is consistent and does not affect the filtration efficiency of each area of ​​the filter membrane 202.

[0061] In one embodiment, the water collection assembly includes: a piping system 4 and a pump 5, the pump 5 being connected to the piping system 4, and a branch pipe of the piping system 4 being connected to the water outlet 2053.

[0062] When pump 5 is in operation, it generates suction force on pipeline system 4, which draws clean water from various parts of the water collection area into pipeline system 4 through inlet distribution pipe 2055, connecting cylinder 2051, and outlet interface 2053, and then discharges it from the outlet of pipeline system 4 (for discharge or for further treatment and recycling).

[0063] In one embodiment, a support member 204 is also designed on the side of the main frame 201. The support member 204 includes: a vertical pole 2041, the bottom end of which is fixedly connected to the inner bottom of the biological treatment tank 1; two lugs 2042 are fixedly connected to the side of the main frame 201; the vertical pole 2041 passes through the lug holes on the two lugs 2042; a guide cylinder 2043 is slidably disposed on the side of the vertical pole 2041 and between the two lugs 2042; the guide cylinder 2043 is fixed to the vertical pole 2041 by fasteners 2045; and elastic rings 2044 are fixedly connected to both ends of the guide cylinder 2043.

[0064] Based on the design of the above-mentioned upright 2041, the main frame 201 can be placed stably. The upright 2041 ensures that the two lugs 2042 can only slide up and down. The elastic rings 2044 at the upper and lower ends of the guide cylinder 2043 support and stabilize the two lugs 2042. In this way, the main frame 201 can be stabilized. After the main frame 201 is stabilized, it can make slight movements in the vertical direction, which is beneficial for being impacted by water flow and airflow.

[0065] In one embodiment, an inner frame 206 and an outer frame 207 are also designed. The inner frame 206 is fixedly connected to the inner wall of the main frame 201, and the outer frame 207 is detachably fixed to the inner frame 206. The filter membrane 202 is clamped and fixed by the inner frame 206 and the outer frame 207.

[0066] The filter membrane 202 is fixed by the inner frame 206 and the outer frame 207, making it very convenient to replace the filter membrane 202 in the future.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible flat sheet membrane wastewater treatment apparatus comprising: A biological treatment tank (1), several flexible flat sheet membrane elements (2), several aeration elements (3), and a water collection assembly installed inside the biological treatment tank (1), characterized in that: The water collection assembly connects several flexible flat sheet membrane elements (2), and the aeration elements (3) are distributed in the area below the flexible flat sheet membrane elements (2) to generate rising airflow and water flow, to scour the membrane surface of the flexible flat sheet membrane elements (2) and provide hydraulic impact power. The flexible flat sheet membrane element (2) includes: The main frame (201) has an open first side and a second side that are opposite to each other. A water collection area is formed inside the main frame (201). A water outlet (205) communicating with the water collection area is provided on the top of the main frame (201). The water outlet (205) is connected to the water collection assembly. The filter membrane (202) is provided in two sets, which are respectively arranged on the first side and the second side of the main frame (201) to cover the opening; Linkage component (203), the linkage component (203) is located in the water collection area, and its two ends are respectively connected to two sets of filter membranes (202); A mesh frame (208) is fixedly connected to the inner side of the main frame (201) and near the two sets of filter membranes (202), and the linkage (203) slides with the mesh frame (208); The linkage component (203) includes: a crossbar (2031), both ends of which are fixedly connected to a connecting plate (2032). The connecting plate (2032) is located between the mesh frame (208) and the filter membrane (202). An outer fastener (2033) is fixedly connected to the outside of the connecting plate (2032). The filter membrane (202) is clamped and fixed by the outer fastener (2033) and the connecting plate (2032). The connecting plate (2032) is fixedly provided with a limiting part (2032a) on the side facing the grid frame (208), and the limiting part (2032a) cooperates with the opening of the grid frame (208); A horizontal member (2035) is fixedly connected to the inner side of the main frame (201), and a bistable elastic member (2034) is fixedly connected to the horizontal member (2035). The bistable elastic member (2034) has a first stable position and a second stable position. The crossbar (2031) is fixedly connected to the bistable elastic member (2034). The bistable elastic element (2034) is an arc-shaped metal sheet, and the two ends of the arc-shaped metal sheet are fixedly connected to the horizontal member (2035), and the middle part of the arc-shaped metal sheet is fixedly connected to the crossbar (2031).

2. A flexible flat sheet membrane wastewater treatment apparatus according to claim 1, wherein: The space frame (208) is composed of several metal bending springs, and both ends of each metal bending spring are fixedly connected to the inner wall of the main frame (201).

3. The flexible flat-sheet membrane wastewater treatment equipment according to claim 1, characterized in that, The filter membrane (202) forms a protrusion (202a) at the connection between the outer fastener (2033) and the connecting plate (2032).

4. The flexible flat sheet membrane wastewater treatment apparatus of claim 1, wherein, The water outlet component (205) includes: a connecting cylinder (2051) fixedly connected to the main frame (201), a first sealing plate (2052) fixedly connected to the top of the connecting cylinder (2051), a water outlet interface (2053) fixedly connected to the first sealing plate (2052), a second sealing plate (2054) fixedly connected to the bottom of the connecting cylinder (2051), and a water inlet distribution pipe (2055) fixedly connected to the bottom of the second sealing plate (2054). The water collection assembly includes: a pipeline system (4) and a pump (5), wherein the pump (5) is connected to the pipeline system (4), and the branch pipe of the pipeline system (4) is connected to the water outlet (2053).

5. The flexible flat sheet membrane wastewater treatment apparatus of claim 1, wherein, Also includes: A support member (204) is provided on the side of the main frame (201). The support member (204) includes: a vertical rod (2041), the bottom end of which is fixedly connected to the inner bottom of the biological treatment tank (1). Two ear pieces (2042) are fixedly connected to the side of the main frame (201). The vertical rod (2041) passes through the ear holes on the two ear pieces (2042). A guide cylinder (2043) is slidably provided on the side of the vertical rod (2041) and between the two ear pieces (2042). The guide cylinder (2043) is fixed to the vertical rod (2041) by fasteners (2045). Both ends of the guide cylinder (2043) are fixedly connected to elastic rings (2044). It also includes: an inner frame (206) and an outer frame (207). The inner frame (206) is fixedly connected to the inner wall of the main frame (201), and the outer frame (207) is detachably fixed to the inner frame (206). The filter membrane (202) is clamped and fixed by the inner frame (206) and the outer frame (207).

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