Reciprocating membrane aerated biofilm reactor

Abstract

The application provides a reciprocating membrane aeration bio-membrane reactor, comprising: a membrane box, the top of the membrane box being provided with a moving wheel; a membrane assembly, the membrane assembly being arranged in the membrane box; a guide rail plate, the guide rail plate being arranged on a membrane pool, the guide rail plate being provided with an arc-shaped guide rail groove matched with the moving wheel along the length direction of the guide rail plate, the arc-shaped guide rail groove being downwardly bent; a buoyancy assembly, the buoyancy assembly being arranged at the bottom of the membrane box; and a power assembly, the power assembly being arranged on the membrane pool and connected with the membrane box, the power assembly being used for driving the membrane box to reciprocate along the length direction of the arc-shaped guide rail groove. The reciprocating membrane aeration bio-membrane reactor can reduce energy consumption, improve mass transfer effect and membrane area utilization.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a reciprocating membrane aeration biofilm reactor. Background Technology

[0002] Currently, commonly used activated sludge processes mainly include Sequencing Batch Reactor (SBR), Anoxic-Oxic (AO), Anaerobic-Anoxic-Oxic (AAO), Cyclic Activated Sludge System (CASS), and oxidation ditch processes. All these processes require aeration, but the main existing aeration method is microporous aeration. However, due to limitations in gas-liquid interface dynamics, the oxygen utilization rate of microporous aeration is only 18-25% (corresponding to 1.8-2.2 kg O2 / kWh). In recent years, the emergence of membrane aerated bioreactor (MABR) technology has fundamentally solved the problem of low oxygen utilization. A MABR is a low-energy-consumption membrane aerated bioreactor that uses a permeable membrane as a carrier for microbial growth, allowing microorganisms to grow on the outer surface of the membrane to form a stable biofilm. The inside of the membrane is filled with air. Oxygen from the air diffuses to the outer surface of the membrane using the concentration gradient between the inside and outside of the membrane as the driving force, and is then utilized by microorganisms. This unique oxygen supply method of the membrane aeration biofilm reactor allows it to achieve an oxygen utilization rate close to 100%, and the oxygen transfer rate can reach over 6 kg O2 / kWh. Currently, membrane aeration biofilm reactors mainly operate in two modes: intermittent aeration and hydraulic circulation. Both modes rely on driving liquid-phase fluid for mixing and require high liquid flow rates to control the biofilm thickness on the membrane fiber surface. Therefore, they require high energy consumption, and both modes suffer from uneven mixing, leading to low membrane area utilization. Summary of the Invention

[0003] In view of this, the present invention provides a reciprocating membrane aeration biofilm reactor that can reduce energy consumption and improve membrane area utilization.

[0004] To solve at least one of the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A reciprocating membrane aeration biofilm reactor according to an embodiment of the present invention includes:

[0006] The membrane box is equipped with casters on its top.

[0007] Membrane module, the membrane module is set in the membrane box;

[0008] The guide plate is used to be installed on the membrane tank. The guide plate has an arc-shaped guide groove along its length to cooperate with the moving wheel. The arc-shaped guide groove is bent downward.

[0009] Buoyancy assembly, which is located at the bottom of the membrane box;

[0010] The power assembly is installed on the membrane tank and connected to the membrane box. The power assembly is used to drive the membrane box to reciprocate along the length of the arc-shaped guide groove.

[0011] In one embodiment of the present invention, there are two sets of moving wheels arranged opposite to each other on the top two sides of the membrane box, and two guide rails distributed opposite to each other on both sides of the membrane box. Each guide rail corresponds to a set of moving wheels, and each set of moving wheels includes a plurality of arc-shaped guide rail grooves arranged sequentially at intervals along the length direction of the guide rail. Each guide rail has a plurality of arc-shaped guide rail grooves, and the moving wheels correspond one-to-one with the arc-shaped guide rail grooves.

[0012] In one embodiment of the present invention, the membrane box is formed as a frame structure, and the membrane box includes:

[0013] A membrane module support, in which the membrane module is installed and connected;

[0014] The moving wheel bracket is located above and connected to the membrane module bracket, and the moving wheels are mounted on the moving wheel bracket;

[0015] The buoyancy support is located below and connected to the membrane module support, and the buoyancy module is connected to the buoyancy support.

[0016] In one embodiment of the present invention, the membrane assembly includes:

[0017] Multiple membrane filaments are arranged vertically, and the multiple membrane filaments are arranged sequentially and at intervals in the membrane box with their arrangement direction perpendicular to the length direction of the guide rail plate.

[0018] The main air distribution pipe is located above each membrane fiber and is connected to each membrane fiber. The main air distribution pipe is equipped with a main air inlet pipe at the top.

[0019] The main gas collection pipe is located below each membrane filament and is connected to each membrane filament. The main gas outlet pipe is located at the bottom of the main gas collection pipe.

[0020] In one embodiment of the present invention, each membrane filament comprises:

[0021] The air distribution pipe is located at the top of the membrane fiber and its length direction is perpendicular to the main air distribution pipe. An air inlet pipe is provided at the top of the air distribution pipe, and the air distribution pipe is connected to the air outlet of the main air distribution pipe through the air inlet pipe.

[0022] The gas collecting pipe is located at the bottom of the membrane fiber and its length direction is perpendicular to the main gas collecting pipe. The gas collecting pipe is parallel to and opposite to the gas distribution pipe. The bottom of the gas collecting pipe is provided with an air outlet pipe, and the gas collecting pipe is connected to the air inlet of the main gas collecting pipe through the air outlet pipe.

[0023] Multiple membrane filaments are located between the gas distribution tube and the gas collection tube and are arranged sequentially at intervals along the length of the gas distribution tube. Each membrane filament is set in a vertical direction, with its upper end connected to the gas distribution tube and its lower end connected to the gas collection tube.

[0024] In one embodiment of the invention, the diameter of the moving wheel is smaller than the vertical distance from the upper surface to the lower surface of the arc-shaped guide groove.

[0025] In one embodiment of the invention, the buoyancy assembly includes two floats, which are disposed opposite each other on the bottom sides of the membrane tank.

[0026] In one embodiment of the present invention, each float is provided with a buoyancy air inlet pipe and a buoyancy drain pipe.

[0027] In one embodiment of the present invention, the power assembly includes:

[0028] Drive components;

[0029] The crank disc is connected to the output shaft of the drive unit, which is used to drive the crank disc to rotate. A connecting rod is provided on the edge of the crank disc.

[0030] An eccentric crank has one end hinged to a connecting rod on the crank plate, and the other end hinged to a diaphragm box via a ball joint connecting rod.

[0031] In one embodiment of the present invention, a drive unit and a guide rail plate are used to be disposed on the top of the membrane tank, and the drive unit is a geared motor.

[0032] The above-described technical solution of the present invention has at least one of the following beneficial effects:

[0033] The reciprocating membrane aeration biofilm reactor of this invention uses a power component to drive the membrane tank to reciprocate along the length of an arc-shaped guide rail groove. The membrane module reciprocates synchronously with the membrane tank in both horizontal and vertical directions. During the movement, the power acts directly on the membrane tank body, thereby causing the membrane module to oscillate and forming a microscale vortex field. This eliminates the dependence on high liquid phase flow velocities, achieving liquid phase mixing and biofilm thickness control within the membrane tank, thus improving mass transfer efficiency and membrane area utilization. Furthermore, by incorporating a buoyancy component to provide buoyancy to the membrane tank and incorporating a downwardly curved arc-shaped guide rail groove on the guide rail plate, the power component and buoyancy component form a dual-mode drag reduction system. This creates an inertial force compensation mechanism, enabling the mutual conversion of kinetic and potential energy, reducing frictional resistance, and decreasing power consumption, thereby reducing energy consumption. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a reciprocating membrane aeration biofilm reactor in one embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the membrane tank structure of a reciprocating membrane aeration biofilm reactor in one embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the membrane module of a reciprocating membrane aeration biofilm reactor in one embodiment of the present invention;

[0037] Figure 4 This is a side view of the membrane module of a reciprocating membrane aeration biofilm reactor according to one embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of the membrane filaments of a reciprocating membrane aeration biofilm reactor in one embodiment of the present invention.

[0039] Figure label:

[0040] 100. Membrane box; 110. Membrane module support; 120. Caster wheel support; 121. Caster wheel; 130. Buoyancy support;

[0041] 200. Membrane module; 210. Membrane fiber assembly; 211. Air distribution pipe; 212. Air inlet pipe; 213. Air collection pipe; 214. Air outlet pipe; 215. Membrane fiber; 220. Main air distribution pipe; 221. Main air inlet pipe; 230. Main air collection pipe; 231. Main air outlet pipe;

[0042] 300, guide rail plate; 310, arc-shaped guide rail groove; 400, float; 410, buoyancy air inlet pipe; 420, buoyancy drain pipe;

[0043] 500. Power assembly; 510. Drive unit; 520. Crankshaft; 530. Eccentric crank; 540. Ball joint connecting rod. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0045] The following describes, with reference to the accompanying drawings, a reciprocating membrane aeration biofilm reactor according to an embodiment of the present invention.

[0046] like Figure 1 As shown, the reciprocating membrane aeration biofilm reactor of this embodiment may include: a membrane tank 100, a membrane module 200, a guide rail plate 300, a buoyancy component, and a power component 500. The membrane tank 100 is equipped with a caster wheel 121 at its top; the membrane module 200 is disposed within the membrane tank 100; the guide rail plate 300 is disposed on the membrane tank, and an arc-shaped guide rail groove 310 is provided along its length direction to cooperate with the caster wheel 121, the arc-shaped guide rail groove 310 being bent downwards; the buoyancy component is disposed at the bottom of the membrane tank 100; the power component 500 is disposed on the membrane tank and connected to the membrane tank 100, and the power component 500 is used to drive the membrane tank 100 to reciprocate along the length direction of the arc-shaped guide rail groove 310.

[0047] In this embodiment, the power component 500 can drive the membrane tank 100 to reciprocate along the length of the arc-shaped guide groove 310 in the membrane tank. The membrane module 200 reciprocates synchronously with the membrane tank 100 in the horizontal and vertical directions. For example, the stroke range of the membrane tank 100 can be 5-30cm, and the reciprocating frequency can be 10-60Hz. During the reciprocating motion, the water flow power directly acts on the membrane module 200, thereby forming a microscale vortex field, which can provide continuous mixing and stirring. Compared with intermittent aeration, the mass transfer effect is improved. In addition, the reciprocating operation mode can also achieve full flow field coverage operation conditions, which effectively improves the effective utilization rate of membrane area (close to 100%) compared with the hydraulic circulation operation mode. Furthermore, by providing buoyancy to the membrane box 100 through a buoyancy component and by providing a downwardly curved arc-shaped guide rail groove 310 on the guide rail plate 300, the power component 500 and the buoyancy component form a dual-mode drag reduction system. On the one hand, this system can provide reciprocating motion to the membrane box 100 in both horizontal and vertical directions, further improving the effective utilization rate of the membrane area. On the other hand, it can also form an inertial force compensation mechanism, realizing the mutual conversion of kinetic energy and potential energy, reducing frictional resistance, reducing power consumption, and thus reducing energy consumption.

[0048] like Figure 1 and Figure 2 As shown, there are two sets of moving wheels 121 arranged opposite to each other on the top sides of the membrane box 100, and two guide rail plates 300 distributed opposite to each other on both sides of the membrane box 100. Each guide rail plate 300 corresponds to a set of moving wheels 121. Each set of moving wheels 121 includes multiple moving wheels arranged at intervals along the length direction of the guide rail plate 300. There are multiple arc-shaped guide rail grooves 310 on each guide rail plate 300, and the moving wheels 121 correspond one-to-one with the arc-shaped guide rail grooves 310.

[0049] In this embodiment, by setting two sets of moving wheels 121 on the top two sides of the membrane box 100 respectively, and setting arc-shaped guide rail grooves 310 on the guide rail plate 300 that correspond one-to-one with the moving wheels 121, and connecting the moving wheels 121 to their respective corresponding arc-shaped guide rail grooves 310, the stability of the membrane box 100 when reciprocating along the length direction of the arc-shaped guide rail grooves 310 can be improved.

[0050] like Figure 1 and Figure 2 As shown, the membrane tank 100 is formed as a frame structure, including a membrane module support 110, a wheel support 120, and a buoyancy support 130. The membrane module 200 is disposed within and connected to the membrane module support 110; the wheel support 120 is located above and connected to the membrane module support 110, and the wheel 121 is disposed on the wheel support 120; the buoyancy support 130 is located below and connected to the membrane module support 110, and the buoyancy component is connected to the buoyancy support 130. In this embodiment, the frame structure of the membrane tank 100 allows the hydrodynamic force to directly act on the membrane module 200, thereby forming a microscale eddy field, which can provide continuous mixing and agitation, improving mass transfer efficiency and the effective utilization rate of the membrane area.

[0051] like Figure 3 and Figure 4 As shown, the membrane module 200 includes: multiple membrane filaments 210, a main air distribution pipe 220, and a main air collection pipe 230. Each membrane filament 210 is arranged vertically, and the multiple membrane filaments 210 are arranged sequentially at intervals in the membrane box 100 with their arrangement direction perpendicular to the length direction of the guide rail plate 300. The main air distribution pipe 220 is located above each membrane filament 210 and communicates with each membrane filament 210. A main air inlet pipe 221 is located at the top of the main air distribution pipe 220. The main air collection pipe 230 is located below each membrane filament 210 and communicates with each membrane filament 210. A main air outlet pipe 231 is located at the bottom of the main air collection pipe 230.

[0052] In this embodiment, multiple membrane filaments 210 are arranged vertically, which effectively increases the effective membrane area, allowing oxygen to continuously diffuse through the micropores of the membrane filaments 215 to the outside of the membrane in a bubble-free manner, thereby providing sufficient oxygen for aerobic microorganisms attached to their surface. The main gas distribution pipe 220 serves as the primary gas distribution channel, connecting to the top of each membrane filament 210 to ensure that gas is evenly distributed to each membrane filament 215, effectively improving the uniformity of gas distribution. The main inlet pipe 221 at the top of the main gas distribution pipe 220 is designed for easy connection with an external gas source system, enabling centralized control of the overall gas flow. The main gas collection pipe 230 collects the oxygen released from the bottom of each membrane filament 210 and discharges it to the membrane pool through the main outlet pipe 231 at the bottom for unified discharge or recycling.

[0053] like Figure 5 As shown, each membrane fiber 210 includes: an air distribution pipe 211, an air collection pipe 213, and a gas collection tube 214. The air distribution pipe 211 is located at the top of the membrane fiber 210 and its length direction is perpendicular to the main air distribution pipe 220. An air inlet pipe 212 is provided at the top of the air distribution pipe 211, and the air distribution pipe 211 is connected to the air outlet of the main air distribution pipe 220 through the air inlet pipe 212. The gas collection pipe 213 is located at the bottom of the membrane fiber 210 and its length direction is perpendicular to the main gas collection pipe 230. The gas collection pipe 213 is parallel to and opposite to the air distribution pipe 211. An air outlet pipe 214 is provided at the bottom of 13, and the air collection pipe 213 is connected to the air inlet of the main air collection pipe 230 through the air outlet pipe 214; multiple membrane filaments 215 are located between the air distribution pipe 211 and the air collection pipe 213 and are arranged sequentially at intervals along the length of the air distribution pipe 211. Each membrane filament 215 is arranged in a vertical direction, and the upper end of each membrane filament 215 is connected to the air distribution pipe 211, and the lower end of each membrane filament 215 is connected to the air collection pipe 213.

[0054] In this embodiment, the gas distribution pipe 211 serves as the gas distribution starting point for the membrane filament 210. Gas from the main gas distribution pipe 220 is introduced through the inlet pipe 212 and evenly transported along the length of the gas distribution pipe 211 to the upper end of each membrane filament 215, ensuring that all membrane filaments 215 receive a balanced gas input. The membrane filament 215 serves as the core channel for gas mass transfer. Its hollow microporous structure allows oxygen to diffuse laterally to the outer surface of the membrane under pressure difference, continuously providing a bubble-free oxygen environment for the external biofilm, thereby reducing oxygen loss, improving oxygen utilization, and suppressing interference with the denitrification reaction during nitrogen removal. The lower end of each membrane filament 215 is connected to the gas collection pipe 213. Uncollected exhaust gas enters the gas collection pipe 213 through the bottom of the membrane filament 215, is then transported to the main gas collection pipe 230 through the outlet pipe 214, and finally discharged or recycled, forming a closed and controllable oxygen supply path. Furthermore, the parallel arrangement of the gas distribution pipe 211 and the gas collection pipe 213 at both ends of the membrane fiber 215 not only provides stable structural support for the membrane fiber 215 but also facilitates modular installation and maintenance of the entire membrane fiber 215 assembly. The membrane fibers 215 are spaced apart along the length of the gas distribution pipe 211, which not only promotes sufficient contact between the biofilm and oxygen transport but also effectively prevents mutual interference, entanglement, or excessive biofilm accumulation between the membrane fibers 215, thus extending the system's operating cycle.

[0055] In one embodiment of the present invention, the movable wheel 121 can rotate freely, and the diameter of the movable wheel 121 is smaller than the vertical distance from the upper surface to the lower surface of the arc-shaped guide groove 310. The buoyancy assembly includes two floats 400, which are arranged opposite each other on both sides of the bottom of the membrane tank 100. Specifically, the vertical distance from the upper surface to the lower surface of the arc-shaped guide groove 310 is 2-4 mm higher than the diameter of the movable wheel 121. Therefore, the overall buoyancy of the membrane tank 100 can be adjusted by injecting air or dewatering into the floats 400, allowing the membrane tank 100 to suspend in the water. This causes the movable wheel 121 to detach from the lower surface of the arc-shaped guide groove 310, forming a controllable gap with a height of 0.1-2 mm. Thus, the rolling friction between the arc-shaped guide groove 310 and the movable wheel 121 effectively reduces frictional resistance, power loss, and energy consumption of the power assembly 500.

[0056] like Figure 2 As shown, each float 400 is equipped with a buoyancy air inlet pipe 410 and a buoyancy drain pipe 420. Specifically, the buoyancy water inlet pipe is located above the float 400, and the buoyancy drain pipe 420 is located below the float 400. When it is necessary to increase the overall buoyancy of the membrane tank 100, air can be injected into the float 400 through the buoyancy air inlet pipe 410, and ballast water can be discharged through the buoyancy drain pipe 420. Conversely, when it is necessary to decrease the overall buoyancy of the membrane tank 100, ballast water can be injected into the float 400 through the buoyancy drain pipe 420, and air can be discharged through the buoyancy air inlet pipe 410. This allows for controllable adjustment of the overall buoyancy of the membrane tank 100.

[0057] In one embodiment of the present invention, the power assembly 500 includes: a drive member 510, a crank disk 520, and an eccentric crank 530. The drive member 510 and the guide plate 300 are disposed on the top of the membrane tank. The drive member 510 is a geared motor. The crank disk 520 is connected to the output shaft of the drive member 510, and the drive member 510 drives the crank disk 520 to rotate. A connecting rod is provided on the edge of the crank disk 520. One end of the eccentric crank 530 is hinged to the connecting rod on the crank disk 520, and the other end of the eccentric crank 530 is hinged to the membrane box 100 via a ball joint connecting rod 540.

[0058] In this embodiment, the geared motor acts as a drive component 510, which drives the crank disk 520 connected to its output shaft to rotate continuously by outputting low-speed, high-torque rotational power. The connecting rod on the edge of the crank disk 520 is hinged to one end of the eccentric crank 530. The connecting rod drives the eccentric crank 530 to perform eccentric rotational motion. One end of the ball joint connecting rod 540 is hinged to the eccentric crank 530 through a ball joint structure, and the other end of the ball joint connecting rod 540 is hinged to the moving wheel bracket 120 of the diaphragm box 100 through a ball joint structure. The ball joint structure can rotate freely. Since one end of the eccentric crank 530 is hinged to the crank disk 520, and the other end is hinged to the diaphragm box 100 through the ball joint connecting rod, the diaphragm box 100 can reciprocate along an arc-shaped trajectory under the constraint of the arc-shaped guide groove 310. This enables the membrane tank 100 and membrane module 200 to reciprocate in both horizontal and vertical directions. The water flow dynamics directly act on the membrane module 200, thereby forming a microscale vortex field, which can provide continuous mixing and stirring. Compared with intermittent aeration, this improves the mass transfer effect and effectively inhibits scaling of membrane fibers 215 and excessive local thickening of biofilm. In addition, the reciprocating operation mode can also achieve full flow field coverage operation, which effectively improves the effective utilization rate of membrane area compared with the hydraulic circulation operation mode.

[0059] In summary, the reciprocating membrane aeration biofilm reactor of the present invention, by using a power component 500 to drive the membrane tank 100 to reciprocate along the length of the arc-shaped guide rail groove 310, and the membrane module 200 reciprocating synchronously with the membrane tank 100 in both horizontal and vertical directions, can achieve liquid phase mixing and biofilm thickness control within the membrane tank, thereby improving mass transfer efficiency and membrane area utilization. Furthermore, by providing buoyancy to the membrane tank 100 with a buoyancy component and by providing a downwardly curved arc-shaped guide rail groove 310 on the guide rail plate 300, the power component 500 and the buoyancy component form a dual-mode drag reduction system, which can create an inertial force compensation mechanism, realizing the mutual conversion of kinetic energy and potential energy, reducing frictional resistance, reducing power consumption, and thus reducing energy consumption.

[0060] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0061] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A reciprocating membrane aeration biofilm reactor, characterized in that, include: A membrane box, the top of which is equipped with casters; Membrane module, the membrane module being disposed in the membrane box; A guide plate is provided on the membrane tank. The guide plate has an arc-shaped guide groove along its length that cooperates with the moving wheel. The arc-shaped guide groove is bent downward. A buoyancy assembly is disposed at the bottom of the membrane tank; A power assembly is provided on the membrane tank and connected to the membrane box, and the power assembly is used to drive the membrane box to reciprocate along the length direction of the arc-shaped guide groove; The diameter of the moving wheel is smaller than the vertical distance from the upper surface to the lower surface of the arc-shaped guide groove. The buoyancy component is used to suspend the membrane box, thereby causing the moving wheel to detach from the lower surface of the arc-shaped guide groove.

2. The reciprocating membrane aeration biofilm reactor according to claim 1, characterized in that, The moving wheels are two sets arranged opposite to each other on the top two sides of the membrane box. The guide rails are two sets distributed opposite to each other on the two sides of the membrane box. Each guide rail corresponds to a set of moving wheels. Each set of moving wheels includes a plurality of wheels arranged at intervals along the length of the guide rail. Each guide rail has a plurality of arc-shaped guide rail grooves. The moving wheels correspond one-to-one with the arc-shaped guide rail grooves.

3. The reciprocating membrane aeration biofilm reactor according to claim 1, characterized in that, The membrane box is formed as a frame structure, and the membrane box includes: A membrane module support, wherein the membrane module is disposed in the membrane module support and connected to the membrane module support; A movable wheel bracket is located above and connected to the membrane module bracket, and the movable wheel is mounted on the movable wheel bracket; A buoyancy support is located below and connected to the membrane module support, and the buoyancy component is connected to the buoyancy support.

4. The reciprocating membrane aeration biofilm reactor according to claim 3, characterized in that, The membrane assembly includes: Multiple membrane filaments are arranged vertically, and the multiple membrane filaments are arranged sequentially at intervals in the membrane box with their arrangement direction perpendicular to the length direction of the guide rail plate; A main air distribution pipe is provided above each of the membrane filaments and is connected to each of the membrane filaments respectively. A main air inlet pipe is provided at the top of the main air distribution pipe. A main gas collection pipe is provided below each of the membrane filaments and communicates with each of the membrane filaments. A main gas outlet pipe is provided at the bottom of the main gas collection pipe.

5. The reciprocating membrane aeration biofilm reactor according to claim 4, characterized in that, Each of the aforementioned membrane filaments includes: An air distribution pipe is located at the top of the membrane fiber and its length direction is perpendicular to the main air distribution pipe. An air inlet pipe is provided at the top of the air distribution pipe, and the air distribution pipe is connected to the air outlet of the main air distribution pipe through the air inlet pipe. A gas collecting pipe is located at the bottom of the membrane fiber and its length direction is perpendicular to the main gas collecting pipe. The gas collecting pipe is parallel to and opposite to the gas distribution pipe. An air outlet pipe is provided at the bottom of the gas collecting pipe. The gas collecting pipe is connected to the air inlet of the main gas collecting pipe through the air outlet pipe. Multiple membrane filaments are located between the air distribution pipe and the air collection pipe and are arranged sequentially at intervals along the length of the air distribution pipe. Each membrane filament is arranged vertically, with its upper end connected to the air distribution pipe and its lower end connected to the air collection pipe.

6. The reciprocating membrane aeration biofilm reactor according to claim 1, characterized in that, The buoyancy assembly includes two floats, which are arranged opposite each other on both sides of the bottom of the membrane tank.

7. The reciprocating membrane aeration biofilm reactor according to claim 6, characterized in that, Each of the aforementioned pontoons is equipped with a buoyancy air inlet pipe and a buoyancy drain pipe.

8. The reciprocating membrane aeration biofilm reactor according to claim 1, characterized in that, The power assembly includes: Drive components; A crank disc, which is connected to the output shaft of the drive unit, the drive unit being used to drive the crank disc to rotate, and a connecting rod being provided on the edge of the crank disc; An eccentric crank, one end of which is hinged to a connecting rod on the crank plate, and the other end of which is hinged to the diaphragm box via a ball joint connecting rod.

9. The reciprocating membrane aeration biofilm reactor according to claim 8, characterized in that, The driving component and the guide rail plate are used to be mounted on the top of the membrane tank, and the driving component is a geared motor.

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