A sewage treatment apparatus having a nested composite membrane assembly
By designing nested composite membrane modules and employing different forms of membrane module rings and flexible rotation methods, the problems of large volume and insufficient microbial nutrients in traditional membrane modules have been solved, achieving highly efficient wastewater treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG KEQING ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2024-09-14
- Publication Date
- 2026-07-03
Smart Images
Figure CN119143282B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a wastewater treatment device with a nested composite membrane module. Background Technology
[0002] Membrane modules serve as excellent carriers for microorganisms in wastewater treatment. The membrane material has a large specific surface area and numerous pores, allowing for water and / or air permeability. This enables it to support a large number of microorganisms and provides them with oxygen. The process of wastewater contacting the membrane material surface is the process of pollutants contacting microorganisms, allowing for thorough biochemical treatment. In practical applications, the simplest way to increase biomass is usually to increase the volume of the membrane module and the surface area of the membrane material. However, excessively large membrane modules increase the costs of installation, operation, and maintenance. In some applications, instead of increasing the module size, the membrane area is increased, resulting in an excessive membrane area per unit water volume. This leads to insufficient nutrients for microorganisms, preventing the formation of a large biofilm and reducing the utilization rate of the membrane material. Summary of the Invention
[0003] To address the aforementioned problems, this invention provides a wastewater treatment device with nested composite membrane modules, comprising a tank body and several membrane modules inside the tank body. The membrane modules have a nested structure and include several layers of membrane rings from the outside to the inside. The membrane rings are generally circular, with the diameter of the membrane rings gradually decreasing from the outside to the inside. Each membrane ring includes a top support plate and a bottom support plate. The membrane rings are divided into three types: vertical, inclined, and composite. The vertical, inclined, and composite membrane rings all include several layers of membrane filaments arranged sequentially from the outside to the inside, with each ring of membrane filaments including several membrane filaments.
[0004] In both vertical and inclined membrane module rings, the membrane fibers in the same loop are parallel to each other. The top end of the membrane fiber is connected to the top support plate, and the bottom end of the membrane fiber is connected to the air supply pipe on the bottom support plate to supply air to the membrane fiber. The membrane fibers in the vertical membrane module ring are all vertical, while the membrane fibers in the inclined membrane module ring are all inclined. The inclined directions of two adjacent loops of membrane fibers in the inclined membrane module ring are opposite.
[0005] The membrane fiber assembly of the composite membrane module ring also includes a circular load frame, and the membrane fibers are all wound around the load frame in a horizontal circle. The membrane fibers of the same ring are evenly distributed from top to bottom between the top support plate and the bottom support plate.
[0006] This invention designs a novel membrane module that completely breaks away from the limitations of traditional cubic membrane modules. It features a cylindrical, nested membrane module that can be flexibly disassembled, with the inner and outer membrane rings operating independently without interference. The entire membrane module contains three types of membrane rings with different membrane fiber placement methods. When the membrane rings rotate, they create richer water flow patterns between the inner and outer rings, promoting wastewater entry into the inner membrane rings.
[0007] Optionally, the top support plate and bottom support plate of the same membrane module ring are concentrically set, correspond to each other vertically, and have the same diameter.
[0008] Optionally, the vertical membrane module ring includes several first docking grooves, several first docking rings, several first air supply pipes, and a first main air pipe. The several first docking grooves are all circular and concentrically arranged. The several first docking grooves are evenly distributed on the lower surface of the top support plate of the vertical membrane module ring and are concave upward. The several first docking rings are all circular and concentrically arranged. The first docking rings can be embedded in the corresponding first docking grooves to facilitate the assembly and disassembly of the membrane fibers. The top ends of the membrane fibers in the same membrane fiber group are closed and connected to the corresponding first docking rings.
[0009] Several first air supply pipes are circular and concentrically arranged. Several first air supply pipes are evenly arranged on the upper surface of the bottom support plate of the vertical membrane module ring. The bottom end of the membrane filament of the same ring is connected to the corresponding first air supply pipe. The first main air pipe runs through each first air supply pipe along the radial direction of the bottom support plate.
[0010] Optionally, the first main air pipe is located on the upper surface of the base plate, and both ends of the first air supply pipe are open and connected to both sides of the first main air pipe respectively. One end of the first main air pipe near the inside of the membrane ring is closed, and the other end is connected to an external air supply device.
[0011] Optionally, the inclined membrane assembly ring includes several second docking grooves, several second docking rings, several second air supply pipes, and a second main air pipe. The several second docking grooves are all circular and concentrically arranged, and are evenly distributed on the lower surface of the top support plate of the inclined membrane assembly ring, and are concave upwards. The several second docking rings are all circular and concentrically arranged, and can be embedded in the corresponding second docking grooves to facilitate the assembly and disassembly of the membrane fibers. The top ends of the membrane fibers in the same group of membrane fibers are closed and connected to the corresponding second docking rings.
[0012] Several second air supply pipes are circular and concentrically arranged. Several second air supply pipes are evenly arranged on the upper surface of the bottom support plate of the vertical membrane module ring. The bottom end of the membrane filament of the same ring is connected to the corresponding second air supply pipe. The second main air pipe passes through each second air supply pipe along the radial direction of the bottom support plate.
[0013] Optionally, the second main air pipe is located on the upper surface of the base plate, and both ends of the second air supply pipe are open and connected to both sides of the second main air pipe respectively. One end of the second main air pipe near the inside of the membrane ring is closed, and the other end is connected to an external air supply device.
[0014] Further optionally, the angle between the membrane filaments of the inclined membrane assembly ring and the vertical line is 20°-45°.
[0015] Optionally, the composite membrane module ring includes several third docking grooves, several fourth docking grooves, several third air supply pipes, and a third main air pipe. The third docking grooves and fourth docking grooves are both circular and concentrically arranged. The third docking grooves are evenly distributed on the lower surface of the top support plate of the composite membrane module ring and are recessed upward. The fourth docking grooves are evenly distributed on the upper surface of the bottom support plate of the composite membrane module ring and are recessed downward. The top and bottom of the load frame of each membrane fiber group are respectively engaged in the third docking groove and the fourth docking groove.
[0016] Several third air supply pipes are vertical and arranged radially along the composite membrane module ring. The top of the third air supply pipe is connected to the top support plate, and the bottom is connected to the third main air pipe on the bottom support plate. The third main air pipe is arranged radially along the bottom support plate.
[0017] Optionally, the load-bearing mesh frame is woven from interlaced plastic filaments. The sides of the load-bearing mesh frame facing the same group of membrane filaments are evenly covered with outwardly protruding heads. The heads are frustum-shaped and the central axis is set horizontally, that is, both circular sides of the heads are vertical.
[0018] Optionally, the membrane module is provided with vertical membrane module rings, inclined membrane module rings and composite membrane module rings arranged sequentially from the outside to the inside, and the vertical, inclined and composite types are arranged in a cyclic manner.
[0019] Each membrane module ring has a top support plate that is detachably connected to a corresponding motor above the water surface via a connecting rod. Each motor corresponds to one membrane module ring, driving different membrane module rings to rotate at different speeds and in different directions.
[0020] Alternatively, the top support plate of each membrane module ring can be detachably connected to a lifting device above the water surface via a connecting rod, allowing for individual control of the vertical position of the membrane module ring within the pool, thus enabling flexible separation of the membrane module rings within the same membrane module. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the vertical membrane module ring.
[0022] Figure 2 This is a three-dimensional schematic diagram of a vertical membrane module ring.
[0023] Figure 3 This is a schematic diagram of the structure of the inclined membrane module ring.
[0024] Figure 4 This is a three-dimensional schematic diagram of the inclined membrane module ring.
[0025] Figure 5 This is a schematic diagram of a composite membrane module ring (the load grid is omitted);
[0026] Figure 6 This is a schematic diagram of the load-bearing space frame.
[0027] In the attached diagram, 1-vertical membrane module ring, 2-slanted membrane module ring, 3-composite membrane module ring, 4-top support plate, 5-bottom support plate, 6-membrane fiber, 7-third main air pipe, 8-load grid frame, 9-pier, 10-fourth docking groove, 11-first docking ring, 12-second docking ring, 13-first air supply pipe, 14-second air supply pipe, 15-third air supply pipe, 16-first main air pipe, 17-second main air pipe. Detailed Implementation
[0028] This embodiment provides a wastewater treatment device with a nested composite membrane module, such as... Figures 1-6 As shown, the system includes a pool body and several membrane modules inside the pool body. The membrane modules have a nested structure and include several layers of membrane module rings from the outside to the inside. The membrane module rings are circular in shape, and their diameter gradually decreases from the outside to the inside. Each membrane module ring includes a top support plate 4 and a bottom support plate 5. There are three types of membrane module rings: vertical, inclined, and composite. The vertical membrane module ring 1, the inclined membrane module ring 2, and the composite membrane module ring 3 all include several layers of membrane filaments arranged sequentially from the outside to the inside. Each membrane filament group includes several membrane filaments 6.
[0029] In both the vertical membrane module ring 1 and the inclined membrane module ring 2, the membrane fibers in the same loop are parallel to each other. The top end of the membrane fiber is connected to the top support plate 4, and the bottom end of the membrane fiber is connected to the air supply pipe on the bottom support plate 5 to supply air to the membrane fiber 6. The membrane fibers in the vertical membrane module ring 1 are all vertical, while the membrane fibers in the inclined membrane module ring 2 are all inclined. The inclined directions of two adjacent loops of membrane fibers in the inclined membrane module ring 2 are opposite.
[0030] The membrane fiber assembly of the composite membrane module ring 3 also includes a circular load frame 8, and the membrane fibers 6 are all wound around the load frame 8 in a horizontal circle. The membrane fibers of the same ring are evenly distributed from top to bottom between the top support plate 4 and the bottom support plate 5.
[0031] Optionally, both the top support plate 4 and the bottom support plate 5 are annular, and the top support plate 4 and the bottom support plate 5 of the same membrane assembly ring are concentrically arranged, correspond vertically, and have the same diameter.
[0032] Optionally, the vertical membrane assembly ring 1 includes several first docking grooves, several first docking rings 11, several first air supply pipes 13, and a first main air pipe 16. The several first docking grooves are all circular and concentrically arranged. The several first docking grooves are evenly arranged on the lower surface of the top support plate 4 of the vertical membrane assembly ring 1 and are concave upward. The several first docking rings 11 are all circular and concentrically arranged. The first docking rings 11 can be embedded in the corresponding first docking grooves to facilitate the assembly and disassembly of the membrane fibers 6. The top ends of the membrane fibers 6 in the same ring of membrane fibers are closed and connected to the corresponding first docking rings 11.
[0033] Several first air supply pipes 13 are circular and concentrically arranged. Several first air supply pipes 13 are evenly arranged on the upper surface of the bottom support plate 5 of the vertical membrane assembly ring 1. The bottom end of the membrane filament 6 of the same membrane filament assembly is connected to the corresponding first air supply pipe 13. The first main air pipe 16 passes through each first air supply pipe 13 along the radial direction of the bottom support plate 5.
[0034] Alternatively, the first docking groove, the first docking ring 11 and the first air supply pipe 13 corresponding to the upper and lower parts have the same diameter, which serves to fix the membrane fibers of the corresponding membrane fiber group and supply air.
[0035] The diameters of several first docking grooves, several first docking rings 11, and several first air supply pipes 13 gradually decrease from the outside to the inside.
[0036] Alternatively, the upper surface of the first air supply pipe 13 is provided with a plurality of docking holes, and the opening at the bottom end of the membrane fiber 6 is inserted into the docking holes, so that the membrane fiber 6 is connected to the corresponding first air supply pipe 13 and can supply air to the membrane fiber.
[0037] Optionally, the first main air pipe 16 is disposed on the upper surface of the base plate 5, and both ends of the first air supply pipe 13 are open and respectively connected to both sides of the first main air pipe 16. That is, the first main air pipe 16 is arranged around the base plate 5, with one side of the first main air pipe 16 as the starting point and the other side as the ending point. The first main air pipe 16 simultaneously supplies air to both ends of the first air supply pipe 13, promoting a more uniform distribution of gas in the first air supply pipe 13. The end of the first main air pipe 16 near the inside of the membrane ring is closed, and the other end is connected to an external air supply device.
[0038] The vertical membrane module ring 1 has several layers of membrane filaments arranged inside and outside. The membrane filaments 6 in each ring are vertical and evenly distributed along the circumference of the vertical membrane module ring 1. In two adjacent rings of membrane filaments, along the radial direction of the vertical membrane module ring 1, the membrane filaments of the inner ring correspond to the positions between two adjacent membrane filaments of the outer ring. This arrangement can make full use of space, increase the membrane filament density, and does not affect the flow of external sewage into and out of the vertical membrane module ring 1, thereby improving the bioload and membrane filament utilization rate.
[0039] Optionally, the inclined membrane assembly ring 2 includes several second docking grooves, several second docking rings 12, several second air supply pipes 14, and a second main air pipe 17. The several second docking grooves are all circular and concentrically arranged. The several second docking grooves are evenly arranged on the lower surface of the top support plate 4 of the inclined membrane assembly ring 2 and are concave upward. The several second docking rings 12 are all circular and concentrically arranged. The second docking rings 12 can be embedded in the corresponding second docking grooves to facilitate the assembly and disassembly of the membrane fibers 6. The top ends of the membrane fibers in the same ring of membrane fibers are closed and connected to the corresponding second docking rings 12.
[0040] Several second air supply pipes 14 are circular and concentrically arranged. Several second air supply pipes 14 are evenly arranged on the upper surface of the bottom support plate 5 of the vertical membrane assembly ring 1. The bottom end of the membrane filament of the same ring of membrane filaments is connected to the corresponding second air supply pipe 14. The second main air pipe 17 passes through each second air supply pipe 14 along the radial direction of the bottom support plate.
[0041] Alternatively, the corresponding second docking grooves, second docking rings 12 and second air supply pipes 14 have the same diameter, which serves to fix the membrane fibers of the corresponding membrane fiber group and supply air.
[0042] The diameters of several second docking grooves, several second docking rings 12, and several second air supply pipes 14 gradually decrease from the outside to the inside.
[0043] Alternatively, the upper surface of the second air supply pipe 14 is provided with a plurality of docking holes, and the opening at the bottom end of the membrane fiber 6 is inserted into the docking holes, so that the membrane fiber 6 is connected to the corresponding second air supply pipe 14 and can supply air to the membrane fiber.
[0044] Optionally, the second main air pipe 17 is disposed on the upper surface of the base plate 5, and both ends of the second air supply pipe 14 are open and connected to both sides of the second main air pipe 17 respectively. That is, the second main air pipe 17 is arranged around the base plate 5, with one side of the second main air pipe 17 as the starting point and the other side as the ending point. The second main air pipe 17 simultaneously supplies air to both ends of the second air supply pipe 14, promoting a more uniform distribution of gas in the second air supply pipe 14. The end of the second main air pipe 17 near the inside of the membrane ring is closed, and the other end is connected to an external air supply device.
[0045] Further optionally, the angle between the membrane filaments of the inclined membrane assembly ring 2 and the vertical line is 20°-45°.
[0046] The inclined membrane module ring 2 is also designed with several layers of membrane filaments arranged inside and outside. The membrane filaments 6 in each ring are inclined and evenly distributed along the circumference of the inclined membrane module ring 2. The inclination directions of two adjacent rings of membrane filaments are opposite. For example, if the outer ring of membrane filaments is inclined to the left from top to bottom, then the inner ring of membrane filaments is inclined to the right from top to bottom. Compared with vertical membrane filaments, although the number of membrane filaments is reduced when the membrane filaments are arranged in an inclined manner, the inclined membrane filaments can change the single form of water flow formed by vertical membrane filaments. In particular, the design of the opposite inclination directions of two adjacent rings of membrane filaments has a stronger ability to disturb the water flow, promoting the flow of sewage from the outside of the membrane module to the inside. Moreover, after long-term operation of the inclined membrane module ring 2, dead microorganisms cover the outside of the active biofilm. Under the action of hydraulic shear force, the inclined membrane filaments make it easier for the dead biofilm to fall off.
[0047] Optionally, the composite membrane assembly ring 3 includes several third docking grooves, several fourth docking grooves 10, several third air supply pipes 15, and a third main air pipe 7. The third docking grooves and fourth docking grooves 10 are both circular and concentrically arranged. The third docking grooves are evenly arranged on the lower surface of the top support plate 4 of the composite membrane assembly ring 3 and are recessed upwards. The fourth docking grooves 10 are evenly arranged on the upper surface of the bottom support plate 5 of the composite membrane assembly ring 3 and are recessed downwards. The top and bottom of the load frame 8 of each membrane filament assembly are respectively engaged in the third docking groove and the fourth docking groove 10.
[0048] Several third air supply pipes 15 are vertical and arranged radially along the composite membrane ring 3. The top of the third air supply pipe 15 is connected to the top support plate 4, and the bottom is connected to the third main air pipe 7 on the bottom support plate 5. The third main air pipe 7 is arranged radially along the bottom support plate 5.
[0049] Alternatively, the diameters of the corresponding third docking groove, load frame 8 and fourth docking groove 10 are the same, and the membrane filaments of the corresponding ring are fixed.
[0050] The diameters of several third docking slots, several fourth docking slots 10, and several load-bearing grid frames 8 gradually decrease from the outside to the inside.
[0051] Optionally, the top of the third air supply pipe 15 is closed, and several docking holes are provided on both sides. The openings at both ends of the membrane fiber 6 are inserted into the docking holes on both sides of the third air supply pipe 15, so that the membrane fiber 6 is connected to the corresponding third air supply pipe 15 and can supply air to the membrane fiber. That is, the membrane fiber is wound around the load frame 8, with one side of the corresponding third air supply pipe 15 as the starting point and the other side as the ending point. The third air supply pipe 15 supplies air to both ends of the membrane fiber at the same time, promoting a more uniform distribution of gas in the membrane fiber.
[0052] Alternatively, the third main air pipe 7 may be closed at one end near the inside of the membrane ring, and the other end may be connected to an external air supply device.
[0053] Optionally, the load frame 8 is woven from interlaced plastic filaments. The sides of the load frame 8 facing the same group of membrane filaments are evenly covered with outwardly protruding heads 9. The heads 9 are frustum-shaped and the central axis is set horizontally, that is, the two circular sides of the heads 9 are both vertical.
[0054] The composite membrane module ring 3 also has several layers of membrane filaments arranged inside and outside. The membrane filaments 6 in each ring are horizontal and evenly distributed along the length of the third air supply pipe 15. The membrane filaments 6 are supported by the load frame 8 of the same ring to form a circle. Some parts of the membrane filaments may contact the circular top surface of the pier 9 (at this time, the circular surface is at the outermost edge of the load frame 8), and some parts may be between two piers 9. The above situation can leave a certain gap between some parts of the membrane filaments and the load frame 8, allowing both parts of the membrane filaments and the load frame 8 to contact the sewage, improving the carrier utilization rate. At the same time, it can limit some parts of the membrane filaments by the piers 9, maintaining the relative position of the membrane filaments and the load frame 8. At the same time, with the help of the buoyancy of the sewage, the membrane filaments can be kept horizontal.
[0055] Traditional membrane fibers are vertically arranged for easy positioning and installation, and they are less likely to become entangled during operation. The inventors unexpectedly discovered that combining transverse and longitudinal membrane fibers can alter the wastewater flow pattern, promote better contact between microorganisms and wastewater, and maintain wastewater treatment efficiency while increasing membrane fiber density. The problems associated with positioning and operation of transverse membrane fibers can be solved by setting up a load-bearing mesh frame 8.
[0056] Optionally, the membrane assembly is provided with a vertical membrane assembly ring 1, an inclined membrane assembly ring 2, and a composite membrane assembly ring 3 arranged sequentially from the outside to the inside, and the vertical, inclined, and composite types are arranged in a cyclical manner.
[0057] Each membrane module ring has a top support plate that is detachably connected to a corresponding motor above the water surface via a connecting rod. Each motor corresponds to one membrane module ring, driving different membrane module rings to rotate at different speeds and in different directions.
[0058] In one specific implementation, the motor corresponding to the innermost membrane ring in the membrane module is positioned lower, so as not to affect the upper motor's control of the rotation of the outer membrane ring. The inner and outer rings of the membrane ring rotate at different speeds and / or in different directions, which is conducive to the entry of wastewater into the membrane module. Combined with the different types of membrane filaments in the inner membrane rings, the micro-flow of water becomes richer and more multi-dimensional, promoting the contact between wastewater and microorganisms on the membrane filaments.
[0059] Alternatively, the top support plate of each membrane module ring can be detachably connected to a lifting device above the water surface via a connecting rod, allowing for individual control of the vertical position of the membrane module ring within the pool, thus enabling flexible separation of the membrane module rings within the same membrane module.
[0060] In one specific implementation, when it is necessary to raise or lower a certain membrane ring component in the membrane module, the connecting rod is disconnected from the motor and connected to the lifting device to control the raising and lowering of the membrane ring component independently.
[0061] After prolonged operation, the biofilm on the membrane filaments ages and dies. The shedding of aged biofilm from the filaments inside the membrane module is more difficult than from the outer filaments. In this invention, each membrane module ring can be flexibly raised and lowered. For example, a membrane module ring inside the membrane module can move downwards, and the tank is equipped with aeration pipes; the aeration promotes the shedding of aged biofilm from this ring. Furthermore, the ability of each membrane module ring to move up and down can temporarily improve the aquatic environment surrounding it, promoting healthy metabolism of the biofilm on it.
[0062] The material of the membrane fibers in this invention is determined according to the requirements of wastewater treatment, for example, heavy ion microporous membranes, PVDF hollow fiber membranes, and PDMS hollow fiber membranes are used.
Claims
1. A wastewater treatment device with a nested composite membrane module, characterized in that, The system includes a pool body and several membrane modules inside the pool body. The membrane modules have a nested structure and include several layers of membrane module rings from the outside to the inside. The membrane module rings are circular in shape, and their diameter gradually decreases from the outside to the inside. Each membrane module ring includes a top support plate and a bottom support plate. There are three types of membrane module rings: vertical, inclined, and composite. The vertical, inclined, and composite membrane module rings all include several layers of membrane filaments arranged sequentially from the outside to the inside, and each membrane filament group includes several membrane filaments. In both vertical and inclined membrane module rings, the membrane fibers in the same loop are parallel to each other. The top end of the membrane fiber is connected to the top support plate, and the bottom end of the membrane fiber is connected to the air supply pipe on the bottom support plate to supply air to the membrane fiber. The membrane fibers in the vertical membrane module ring are all vertical, while the membrane fibers in the inclined membrane module ring are all inclined. The inclined directions of two adjacent loops of membrane fibers in the inclined membrane module ring are opposite. The membrane fiber assembly of the composite membrane module ring also includes a circular load frame, and the membrane fibers are all wound around the load frame in a horizontal circle. The membrane fibers of the same ring are evenly distributed from top to bottom between the top support plate and the bottom support plate. The composite membrane module ring includes several third docking grooves, several fourth docking grooves, several third air supply pipes, and a third main air pipe. The third docking grooves and fourth docking grooves are both circular and concentrically arranged. The third docking grooves are evenly distributed on the lower surface of the top support plate of the composite membrane module ring and are recessed upwards. The fourth docking grooves are evenly distributed on the upper surface of the bottom support plate of the composite membrane module ring and are recessed downwards. The top and bottom of the load frame of each membrane fiber group are respectively engaged in the third docking groove and the fourth docking groove. Several third air supply pipes are vertical and distributed radially along the composite membrane module ring. The top of the third air supply pipe is connected to the top support plate, and the bottom is connected to the third main air pipe on the bottom support plate. The third main air pipe is arranged radially along the bottom support plate. The load-bearing mesh frame is woven from interlaced plastic filaments. The sides of the load-bearing mesh frame facing the same group of membrane filaments are evenly covered with outwardly protruding heads. The heads are frustum-shaped and the central axis is set horizontally. The two circular sides of the heads are both vertical. The membrane module is provided with vertical membrane module rings, inclined membrane module rings and composite membrane module rings in sequence from the outside to the inside, and the vertical, inclined and composite types are arranged radially in a circular manner. The top support plate of each membrane module ring is detachably connected to the corresponding motor above the water surface via a connecting rod. One motor corresponds to one membrane module ring, driving different membrane module rings to rotate at different speeds and directions. Each membrane module ring's top support plate is detachably connected to a lifting device above the water surface via a connecting rod, allowing for individual control of the membrane module ring's vertical position within the tank, thus enabling flexible separation of membrane module rings within the same membrane module.
2. The wastewater treatment device with nested composite membrane modules according to claim 1, characterized in that, The top and bottom support plates of the same membrane module ring are concentrically set, correspond to each other, and have the same diameter.
3. The wastewater treatment device with nested composite membrane modules according to claim 2, characterized in that, The vertical membrane module ring includes several first docking grooves, several first docking rings, several first air supply pipes and a first main air pipe. The several first docking grooves are all circular and concentrically arranged. The several first docking grooves are evenly arranged on the lower surface of the top support plate of the vertical membrane module ring and are recessed upward. Several first docking rings are all circular and concentrically arranged. The first docking rings can be embedded in the corresponding first docking grooves, which facilitates the assembly and disassembly of the membrane fibers. The top ends of the membrane fibers in the same group of membrane fibers are closed and connected to the corresponding first docking rings. Several first air supply pipes are circular and concentrically arranged. Several first air supply pipes are evenly arranged on the upper surface of the bottom support plate of the vertical membrane module ring. The bottom end of the membrane filament of the same ring is connected to the corresponding first air supply pipe. The first main air pipe runs through each first air supply pipe along the radial direction of the bottom support plate.
4. The wastewater treatment device with nested composite membrane modules according to claim 3, characterized in that, The first main air pipe is located on the upper surface of the base plate. Both ends of the first air supply pipe are open and connected to both sides of the first main air pipe respectively. One end of the first main air pipe near the inside of the membrane ring is closed, and the other end is connected to an external air supply device.
5. The wastewater treatment device with nested composite membrane modules according to claim 2, characterized in that, The inclined membrane assembly ring includes several second docking grooves, several second docking rings, several second air supply pipes and a second main air pipe. The several second docking grooves are all circular and concentrically arranged. The several second docking grooves are evenly arranged on the lower surface of the top support plate of the inclined membrane assembly ring and are recessed upward. Several second docking rings are all circular and concentrically arranged. The second docking rings can be embedded in the corresponding second docking grooves, which facilitates the assembly and disassembly of the membrane fibers. The top ends of the membrane fibers in the same group of membrane fibers are closed and connected to the corresponding second docking rings. Several second air supply pipes are circular and concentrically arranged. Several second air supply pipes are evenly arranged on the upper surface of the bottom support plate of the inclined membrane module ring. The bottom end of the membrane filament of the same ring is connected to the corresponding second air supply pipe. The second main air pipe passes through each second air supply pipe along the radial direction of the bottom support plate.
6. The wastewater treatment device with a nested composite membrane module according to claim 5, characterized in that, The second main air pipe is located on the upper surface of the base plate. Both ends of the second air supply pipe are open and connected to both sides of the second main air pipe respectively. One end of the second main air pipe near the inside of the membrane ring is closed, and the other end is connected to the external air supply device. The angle between the membrane filaments of the inclined membrane module ring and the vertical line is 20°-45°.