Membrane treatment device capable of delaying membrane pollution and easy to clean

Abstract

The invention relates to a membrane treatment device capable of delaying membrane pollution and easy to clean, which comprises a main treater, the main treater comprises a concentrated water area, a filter area and a water inlet area from top to bottom, the top of the filter area is provided with an upper partition plate, and the bottom of the filter area is provided with a lower partition plate; at least one ultrafiltration membrane assembly is arranged in the main processor and comprises a plurality of membrane wires and a plurality of functional pipes, an upper fixing block is located on the upper partition plate, the tops of the membrane wires and the functional pipes penetrate through the upper partition plate to be connected with the upper fixing block, a lower fixing block is located below the lower partition plate, and the bottoms of the membrane wires and the functional pipes penetrate through the lower partition plate to be connected with the lower fixing block; a plurality of membrane filaments are distributed on the cross section of the ultrafiltration membrane assembly from outside to inside layer by layer, a layer of functional pipe is arranged between every two adjacent layers of membrane filaments inside and outside, clean water and / or gas are input into the functional pipes and can be released to the surrounding membrane filaments, and the clean water and / or gas and sewage or cleaning water with certain pressure in the membrane filaments act synergistically, so that the membrane filaments can be recycled. Dirt deposition in the membrane filaments is weakened or the membrane filament cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment membranes, and particularly relates to a membrane treatment device that can delay membrane fouling and is easy to clean. Background Art

[0002] Membrane separation technology is a technology centered on a separation membrane, with functions such as separation, concentration, and purification, and is an important sewage treatment technology. In particular, ultrafiltration membranes have been widely used in the sewage pretreatment stage to remove impurities such as suspended solids, colloidal particles, and bacteria in sewage, ensuring the long-term safe and stable operation of subsequent equipment such as reverse osmosis. Currently, tubular and hollow fiber ultrafiltration membranes are more commonly used, with a large packing density, which can obtain a large membrane surface area and improve the water treatment efficiency. Currently, the problems of membrane fouling and membrane cleaning have a greater impact on the sewage treatment efficiency of ultrafiltration membranes. Due to the different qualities of the sewage being treated, the degree of membrane fouling is basically proportional to the degree of deterioration of the sewage quality. How to extend the service life of tubular or hollow fiber ultrafiltration membranes and how to improve the membrane cleaning efficiency are problems faced by those skilled in the art. Summary of the Invention

[0003] In view of the above problems, the present invention provides a membrane treatment device that can delay membrane fouling and is easy to clean, including a main processor. Inside the main processor, from top to bottom, there are a concentrated water area, a filtration area, and a water inlet area. At the top of the filtration area, there is an upper partition plate, and at the bottom, there is a lower partition plate for separating each area; at least one ultrafiltration membrane module is provided inside the main processor. The ultrafiltration membrane module includes an upper fixing block, a plurality of membrane filaments, a plurality of functional tubes, and a lower fixing block. The upper fixing block is located on the upper partition plate. The tops of the membrane filaments and the functional tubes pass through the upper partition plate to connect to the upper fixing block. The lower fixing block is located below the lower partition plate. The bottoms of the membrane filaments and the functional tubes pass through the lower partition plate to connect to the lower fixing block;

[0004] A plurality of membrane filaments are arranged layer by layer from the outside to the inside in a circle on the cross-section of the ultrafiltration membrane module. Between two adjacent inner and outer layers of membrane filaments, there is a layer of functional tubes. Clear water and / or gas with a certain pressure are input into the functional tubes, and can release clear water and / or gas to the surrounding membrane filaments, and cooperate with the sewage or cleaning water with a certain pressure inside the membrane filaments to weaken the deposition of dirt inside the membrane filaments or improve the membrane filament cleaning efficiency.

[0005] Optionally, a raw water tank and a product water tank are also provided beside the main processor. The bottom of the main processor is connected to the raw water tank through a water inlet pipe to input sewage into the water inlet area; at least one product water pipe is provided on the side corresponding to the filtration area. The product water pipe is connected to the product water tank to input the product water obtained by membrane filtration into the product water tank; a concentrated water outlet is provided at the top of the main processor. The concentrated water outlet is connected in parallel to the raw water tank and the product water tank, and can not only return the concentrated water generated by filtration to the raw water tank during sewage treatment, but also return the wastewater after cleaning to the product water tank during membrane cleaning.

[0006] Further optionally, the water production tank is provided with a cleaning outlet, and the cleaning outlet is connected to the water production pipe and the water inlet pipe in parallel through a pipeline, so that when used for membrane cleaning, the produced water is input into the filtration area and the water inlet area to clean the inside and outside of the membrane fibers.

[0007] Optionally, the membrane filaments and functional tubes of the ultrafiltration membrane assembly are integrally surrounded into a cylindrical shape, a functional tube is arranged at the innermost center of the ultrafiltration membrane assembly, recorded as the central functional tube, a circle of membrane filaments is arranged on the outer side of the central functional tube, and then the functional tubes and membrane filaments are arranged outward layer by layer in an alternating order, and are arranged concentrically; each circle of membrane filaments consists of a plurality of membrane filaments uniformly arranged along the circumference of the circle, and each circle of functional tubes consists of a plurality of functional tubes uniformly arranged along the circumference of the circle;

[0008] The functional tube is a slender flexible tube body with a hollow interior and evenly distributed through holes on the surface. The top end is closed and the bottom end is open, so that the clean water and / or gas inside the functional tube can be output from the functional tube through the through holes.

[0009] Preferably, in the direction from the central functional tube toward the outside of the ultrafiltration membrane assembly, the ratio of the number of membrane filaments in the membrane filament layer is 6:12:18:24; the number of membrane filament layers is preferably 2-3 layers.

[0010] Further optionally, a first circle of functional tubes is arranged between the first layer and the second layer of membrane filaments, and a second circle of functional tubes is arranged between the second layer and the third layer of membrane filaments; the first circle of functional tubes includes 3-4 functional tubes, preferably 4; the second circle of functional tubes includes 6-8 functional tubes, preferably 8;

[0011] There is a gap between a circle of functional tubes and the inner and outer adjacent membrane filament layers to avoid direct contact between the membrane filaments and the functional tubes.

[0012] Optionally, the upper partition is provided with an upper slot at a position corresponding to the membrane wire and the functional tube, the upper slot is a through hole, the upper slot corresponds to the membrane wire and the functional tube one by one, and the membrane wire and the functional tube pass through the upper slot to pass out of the upper partition;

[0013] A plurality of through holes are evenly arranged on the side wall of the upper slot, so that when the membrane assembly is packaged, the glue flows through the through holes in each upper slot, so as to better bond the membrane wire and the upper slot, and the functional tube and the upper slot;

[0014] The upper fixing block is connected to the upper partition. After the top ends of the membrane wires and the functional tubes pass through the upper partition, they are connected to the upper fixing block, which provides support for the membrane wires and the functional tubes.

[0015] Optionally, the lower partition plate is provided with a lower slot at a position corresponding to the membrane wire and the functional tube, the lower slot is a through hole, the lower slot corresponds to the membrane wire and the functional tube one by one, and the membrane wire and the functional tube pass through the lower partition plate through the lower slot;

[0016] A number of through holes are evenly arranged on the side wall of the lower slot, facilitating the flow of glue through the through holes in each lower slot during the encapsulation of the membrane module, so as to better bond the membrane filaments with the lower slot and the functional tubes with the lower slot;

[0017] The lower fixing block is connected to the lower partition plate. After the bottom ends of the membrane filaments and the functional tubes pass through the lower partition plate, they are connected to the lower fixing block, and the lower fixing block provides support for the membrane filaments and the functional tubes.

[0018] Further optionally, the bottom ends of all the functional tubes are connected to a comprehensive tube, and the comprehensive tube passes through the main processor and is then connected in parallel to a clean water source and an air inlet pipe for inputting clean water and / or gas into the functional tubes.

[0019] When the functional tubes release gas, bubbles may be formed. If the bubbles adhere to the surface of the membrane filaments, they may cover the membrane pores, which is not conducive to the discharge of the produced water during water treatment or the reverse cleaning of the produced water during cleaning. The present invention provides the following solutions to solve the problem of bubble adhesion.

[0020] Optionally, a mobile cleaning device is provided inside the main processor. The mobile cleaning device includes a telescopic device and a support frame with defoaming brushes. The telescopic device is arranged above the main processor, inside the concentrated water area or at the top of the filtration area. The telescopic end of the telescopic device is connected to the top of the support frame for driving the support frame to move up and down;

[0021] The support frame includes a number of cleaning components from top to bottom. Each cleaning component includes a number of support rings from inside to outside. A number of rotatable defoaming brushes are arranged on the support rings. The support rings are located between two adjacent layers of membrane filaments inside and outside for cleaning the bubbles on the outer wall of the membrane filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the main processor of the membrane treatment device that can delay membrane fouling and is easy to clean;

[0023] Figure 2 It is a plan view of the upper slot;

[0024] Figure 3 It is a schematic diagram of the ultrafiltration membrane module;

[0025] Figure 4 It is a schematic diagram of the distribution of the membrane filaments and the functional tubes (in order to observe more clearly, the membrane filaments and the functional tubes are dispersed in the figure);

[0026] Figure 5 It is a schematic diagram of the mobile cleaning device;

[0027] Figure 6 It is a schematic diagram of the defoaming brush;

[0028] Figure 7 It is a schematic diagram of the connection between the main processor and the raw water tank and the product water tank.

[0029] In the attached drawings, 1 is the main processor, 2 is the concentrated water area, 3 is the filtration area, 4 is the water inlet area, 5 is the upper partition board, 6 is the lower partition board, 7 is the upper fixing block, 8 is the membrane filaments, 9 is the functional tube, 10 is the lower fixing block, 11 is the raw water tank, 12 is the product water tank, 13 is the water inlet pipe, 14 is the product water pipe, 15 is the concentrated water outlet, 16 is the cleaning outlet, 17 is the central functional tube, 18 is the upper slot, 19 is the defoaming brush, 20 is the telescopic device, 21 is the support frame, and 22 is the support ring. Specific implementation mode

[0030] This embodiment provides a membrane treatment device that can delay membrane fouling and is easy to clean. As Figures 1-7 shown, it includes a main processor 1. Inside the main processor 1, from top to bottom, there are a concentrated water area 2, a filtration area 3, and a water inlet area 4. At the top of the filtration area 3, there is an upper partition board 5, and at the bottom, there is a lower partition board 6 for separating each area. Inside the main processor 1, there is at least one ultrafiltration membrane module. The ultrafiltration membrane module includes an upper fixing block 7, several membrane filaments 8, several functional tubes 9, and a lower fixing block 10. The upper fixing block 7 is located on the upper partition board 5. The tops of the membrane filaments 8 and the functional tubes 9 pass through the upper partition board 5 to connect to the upper fixing block 7. The lower fixing block 10 is located below the lower partition board 6. The bottoms of the membrane filaments 8 and the functional tubes 9 pass through the lower partition board 6 to connect to the lower fixing block 10;

[0031] Several membrane filaments 8 are distributed layer by layer in circles from the outside to the inside in the cross-section of the ultrafiltration membrane module. Between two adjacent inner and outer layers of membrane filaments, there is a layer of functional tubes 9. Clear water and / or gas with a certain pressure are input into the functional tubes 9, and can release clear water and / or gas to the surrounding membrane filaments 8, and cooperate with the sewage or cleaning water with a certain pressure inside the membrane filaments 8 to weaken the deposition of dirt inside the membrane filaments or improve the membrane filament cleaning efficiency.

[0032] Optionally, a raw water tank 11 and a product water tank 12 are also provided beside the main processor 1. The bottom of the main processor 1 is connected to the raw water tank 11 through a water inlet pipe 13 to input sewage into the water inlet area 4; on the side corresponding to the filtration area 3, there is at least one product water pipe 14, and the product water pipe 14 is connected to the product water tank 12 to input the product water obtained by membrane filtration into the product water tank 12; at the top of the main processor 1, there is a concentrated water outlet 15, and the concentrated water outlet 15 is connected in parallel with the raw water tank 11 and the product water tank 12, which can not only return the concentrated water generated by filtration to the raw water tank 11 when treating sewage, but also return the wastewater after membrane cleaning to the product water tank 12 during membrane cleaning.

[0033] Further optionally, the product water tank 12 is provided with a cleaning outlet 16. The cleaning outlet 16 is connected in parallel with the product water pipe 14 and the water inlet pipe 13 through a pipeline, and is used to input product water into the filtration area 3 and the water inlet area 4 during membrane cleaning to clean the inside and outside of the membrane filaments.

[0034] Optionally, the membrane filaments and functional tubes of the ultrafiltration membrane assembly are integrally surrounded into a cylindrical shape, a functional tube is arranged at the innermost center of the ultrafiltration membrane assembly, and is recorded as a central functional tube 17. A circle of membrane filaments is arranged on the outer side of the central functional tube 17, and then the functional tubes and membrane filaments are arranged outward layer by layer in an alternating order, and are arranged concentrically; each circle of membrane filaments is composed of a plurality of membrane filaments uniformly arranged along the circumference of the circle, and each circle of functional tubes is composed of a plurality of functional tubes uniformly arranged along the circumference of the circle;

[0035] The functional tube 9 is a slender flexible tube body with a hollow interior and evenly distributed through holes on the surface. The top end is closed and the bottom end is open, so that the clean water and / or gas inside the functional tube can be output from the functional tube through the through holes.

[0036] Preferably, in the direction from the central functional tube to the outside of the ultrafiltration membrane assembly, the number of membrane wires of the membrane wire coils is 6, 12, 18, and 24, respectively. The number of membrane wire coils (i.e., the number of membrane wire layers) is reasonably arranged according to the amount of sewage treatment and the size of the main processor 1;

[0037] Since too many membrane wire layers affect the sewage treatment effect and membrane cleaning effect, the number of membrane wire circles is preferably 2-3 circles. That is, from the inside to the outside, the first circle of membrane wires includes 6 membrane wires, the second circle includes 12 membrane wires, and the third circle includes 18 membrane wires.

[0038] The membrane fibers of the present invention are arranged in layers in a honeycomb shape around the outside of the central functional tube 17, which can fully utilize the space, increase the density of the membrane fibers, and further improve the water treatment efficiency.

[0039] Further optionally, a first circle of functional tubes is arranged between the first circle and the second circle of membrane wires, and a second circle of functional tubes is arranged between the second circle and the third circle of membrane wires; the first circle of functional tubes includes 3-4 functional tubes, preferably 4; the second circle of functional tubes includes 6-8 functional tubes, preferably 8;

[0040] There is a gap between a circle of functional tubes and the inner and outer adjacent membrane wire circles to avoid direct contact between the membrane wires and the functional tubes.

[0041] Optionally, the upper partition plate 5 is provided with an upper slot 18 at a position corresponding to the membrane wire and the functional tube. The upper slot 18 is a through hole. The upper slot 18 corresponds to the membrane wire and the functional tube one by one. The membrane wire and the functional tube pass through the upper slot 18 and pass out of the upper partition plate 5.

[0042] The upper partition 5 has a certain thickness, for example, 1-5 cm, and a plurality of through holes are evenly arranged on the side wall of the upper slot 18, so that when the membrane assembly is packaged, the glue flows through the through holes in each upper slot 18, so as to better bond the membrane wire and the upper slot 18, and the functional tube and the upper slot 18;

[0043] The upper fixing block 7 is connected to the upper partition plate 5. After the top ends of the membrane filaments and the functional tubes pass through the upper partition plate 5, they are connected to the upper fixing block 7, and the upper fixing block 7 provides support for the membrane filaments and the functional tubes.

[0044] Optionally, lower slots are provided at the positions of the membrane filaments and the functional tubes corresponding to the lower partition plate 6. The lower slots are through holes, and the lower slots correspond to the membrane filaments and the functional tubes one by one. The membrane filaments and the functional tubes pass through the lower partition plate 6 through the lower slots.

[0045] The lower partition plate 6 has a certain thickness, for example, 1 - 5 cm. A number of through holes are evenly provided on the side walls of the lower slots. When encapsulating the membrane module, glue can flow through the through holes in each lower slot, so as to better bond the membrane filaments with the lower slots and the functional tubes with the lower slots.

[0046] The lower fixing block 10 is connected to the lower partition plate 6. After the bottom ends of the membrane filaments and the functional tubes pass through the lower partition plate 6, they are connected to the lower fixing block 10, and the lower fixing block 10 provides support for the membrane filaments and the functional tubes.

[0047] After the top and bottom ends of the membrane filaments are respectively connected to the upper fixing block 7 and the lower fixing block 10, they are in an open state. After the water inlet pipe 13 inputs sewage into the water inlet area 4 of the main processor 1, due to the blocking effect of the lower partition plate 6, the sewage can only enter the membrane filaments from the bottom opening of the membrane filaments, and then rise along the internal space of the membrane filaments to the filtration area 3. After the sewage is filtered through the membrane pores of the membrane filaments, the produced water enters the filtration area 3, and then is discharged to the water production tank 12 through the water production pipe 14. The concentrated water continues to rise along the inside of the membrane filaments to the concentrated water area 2, and then returns to the original water tank 11 through the concentrated water outlet 15. An air inlet pipe can also be connected to the bottom of the water inlet area 4, and gas is introduced at intervals to perform air scouring and cleaning on the membrane module. A small amount of ozone can also be introduced to prevent fouling of the membrane module by microorganisms and reduce the frequency of membrane module replacement.

[0048] Further optionally, the bottom ends of all the functional tubes are connected to a comprehensive tube. The comprehensive tube passes through the main processor 1 and is then connected in parallel to a clean water source and an air inlet pipe for inputting clean water and / or gas into the functional tubes.

[0049] In the present invention, a number of functional tubes are arranged inside the membrane module, and the functional tubes can release clear water and / or gas outward. When the ultrafiltration membrane module treats sewage, sewage is introduced into the membrane filaments. After being filtered by the membrane material, water produced passes through the membrane pores and exits the membrane filaments, while contaminants remain on the inner wall of the membrane filaments. The functional tubes input gas into the filtration zone 3, disturbing the produced water and increasing the degree of water flow turbulence on the water production side of the membrane filaments, thereby improving the membrane filtration efficiency; the input gas can contain a small amount of ozone to prevent fouling of the membrane module by microorganisms; since the distance between the functional tubes and the membrane filaments is not far, the gas released by the functional tubes can impact the surface of the adjacent membrane filaments, causing the surface of the membrane filaments to vibrate, which is conducive to the falling off of the contaminants attached to the inner wall of the membrane filaments and delaying the fouling of the membrane filaments. According to the actual water volume and water quality of the sewage to be treated, gas and clear water are simultaneously input into the functional tubes, and by reasonably adjusting the fluid flow rate (or conveying pressure) or conveying form (such as intermittent conveying or pulsed conveying) inside the functional tubes, the above-mentioned effects on the adjacent membrane filaments can be enhanced or weakened, prolonging the service life of the membrane module and improving the membrane fouling situation.

[0050] During routine maintenance cleaning of the membrane module, the backwash water pump extracts water from the product water tank 12 and enters the filtration zone 3 through the product water pipe 14 to perform reverse cleaning on the membrane filaments. When the water production of the main processor 1 drops severely, membrane cleaning chemicals are added to the product water tank 12 to form a cleaning liquid. The backwash pump also serves as a chemical cleaning water pump, injecting the cleaning liquid from the water inlet pipe 13 into the water inlet zone 4, then inputting it into the interior of the membrane filaments and rising along the membrane filaments, thereby cleaning the entire membrane filament. The cleaning liquid after cleaning carries contaminants into the concentrated water zone 2 and then is discharged into the original water tank 11 or the product water tank 12 from the concentrated water outlet 15.

[0051] During routine maintenance cleaning of the membrane module, the produced water cleans the membrane filaments from the outside to the inside. At this time, clear water (or produced water) and / or gas are input into the functional tubes, and water and / or gas are released to the adjacent membrane filaments, increasing the degree of water flow turbulence inside the membrane module and acting synergistically with the produced water to enhance the cleaning intensity of the produced water, reversely impacting the outer wall of the membrane filaments, causing the contaminants on the inner wall of the membrane filaments to fall off under the vibration effect, and also being able to reversely impact the membrane pores, promoting the reverse entry of the produced water into the membrane filaments, thereby cleaning the fouling of the membrane pores and improving the daily cleaning efficiency.

[0052] When the water production of the main processor 1 drops severely, the cleaning liquid is directly input into the interior of the membrane filaments for cleaning. At this time, the functional tubes still release water and / or gas to the adjacent membrane filaments, reversely impacting the outer wall of the membrane filaments with a certain pressure. The cleaning liquid inside the membrane also has a certain pressure, and the pressure directions inside and outside the membrane filaments are mostly different. In this way, the inside and outside of the membrane filaments play a synergistic role, cleaning, flushing, and impact-vibrating the wall surface of the membrane filaments, promoting the rapid shedding of contaminants, quickly dredging the fouling, and improving the cleaning efficiency. When cleaning the membrane filaments, the functional tubes can still adjust the fluid flow rate (or conveying pressure) or conveying form (such as intermittent conveying or pulsed conveying) inside the functional tubes.

[0053] The membrane filament layer and the functional tube layer are arranged alternately. The two sides of the functional tube face the membrane filaments of the inner and outer layers respectively, and can play the above-mentioned roles on the membrane filament layers on both sides. The membrane filament layer can also receive the effects of the functional tube layers on both sides. The functional tube can be a microfiltration membrane filament, and the membrane pore diameter is larger than that of the ultrafiltration membrane filament, which is convenient for releasing water and / or gas. The functional tube can also be an aeration tube, with evenly distributed aeration holes, capable of outputting water and / or gas.

[0054] The setting of the number of membrane filaments in the membrane filament layer and the number of functional tubes can maximize the role of each functional tube on the basis of saving functional tubes. The functional tube can evenly release water and / or gas to the surrounding membrane filaments, so that each layer of membrane filaments can receive the effect of the functional tube.

[0055] When the functional tube releases gas, bubbles may be formed. If the bubbles adhere to the surface of the membrane filaments, they may cover the membrane pores, which is not conducive to the water production discharge during water treatment or the reverse cleaning of water production during cleaning. The present invention provides the following solutions to solve the problem of bubble adhesion.

[0056] Optionally, a mobile cleaning device is provided in the main processor 1. The mobile cleaning device includes a telescopic device 20 and a support frame 21 with a defoaming brush 19. The setting position of the telescopic device 20 is selected above the main processor 1, in the concentrated water area 2 or at the top of the filtration area 3. The telescopic end of the telescopic device 20 is connected to the top of the support frame 21 for driving the support frame 21 to move up and down;

[0057] The support frame 21 includes several cleaning components from top to bottom. Each cleaning component includes several layers of support rings 22 from inside to outside. A number of rotatable defoaming brushes 19 are provided on the support rings 22. The support rings 22 are located between two adjacent inner and outer layers of membrane filaments for cleaning the bubbles on the outer wall of the membrane filaments.

[0058] Further optionally, the support frame 21 includes several vertical rods. At least two rods are evenly arranged circumferentially on each support ring 22 for supporting the support ring 22. The rods corresponding to each support ring 22 can be arranged corresponding to each other or not aligned.

[0059] Further optionally, the support ring 22 is circular, and several defoaming brushes 19 are evenly distributed along the circumference of the support ring 22. The part of the support ring 22 corresponding to the defoaming brush 19 is a straight line. The defoaming brush 19 is a hollow tube, and bristles are evenly distributed on the outside of the tube. There is a very small gap between the free ends of the bristles and the outer side of the facing membrane filaments.

[0060] When the telescopic device 20 drives the support ring 22 to move up and down through the rod, the defoaming brush 19 follows the support ring 22 to move up and down, and can also rotate around the straight line part of its corresponding support ring 22 under the action of water flow to clean the bubbles on the outer side of the membrane filaments.

[0061] A ring-shaped support ring 22 can separate two adjacent inner and outer layers of membrane filaments. When treating sewage or cleaning the membrane filaments, the support ring 22 moves up and down regularly or irregularly, which can straighten the membrane filaments and prevent the entanglement of the two layers of membrane filaments. The functional tubes between two adjacent layers of membrane filaments can be located inside or outside the support ring 22.

[0062] The support frame 21 is provided with a number of cleaning components from top to bottom, and the spacing between adjacent upper and lower cleaning components is equal. The telescopic device 20 drives the support frame 21 to move a distance of one such spacing, so that each support ring 22 moves a distance of one spacing, and the entire vertical length of the membrane filaments can be cleaned by each support ring 22. The moving cleaning device of the present invention has a simple structure, is easy to operate and run, has a low cost, is suitable for the layered structure of the membrane module of the present invention, and while cleaning the dirt and bubbles on the outer wall of the membrane filaments, can also drive the water body in the filtration area 3 to move up and down, greatly disturbing the water body and improving the effect of water treatment and membrane cleaning.

[0063] Both the vertical membrane module and the main processor 1 have a characteristic that the membrane filaments at the lower part of the main processor 1 bear a greater water pressure than the membrane filaments at the upper part (due to the action of gravity on the water body). The greater water pressure outside the membrane filaments will form a force to squeeze the membrane filaments, which will, to a certain extent, affect the outward filtration of the sewage inside the membrane filaments, and thus affect the water treatment efficiency of the lower membrane filaments. The present invention proposes the following solutions.

[0064] Optionally, the filtration area 3 is divided into upper and lower parts, and a middle partition is provided between the upper and lower parts for isolating the upper and lower parts; a first water production pipe 14 is provided on the side of the lower part, and a second water production pipe 14 is provided on the side of the upper part, which are respectively used for discharging the produced water of the lower part and the upper part.

[0065] Further optionally, middle slots are provided on the middle partition at positions corresponding to the membrane filaments and the functional tubes. The middle slots are through holes, and the middle slots correspond to the membrane filaments and the functional tubes one by one. The membrane filaments and the functional tubes pass through the middle partition through the middle slots;

[0066] The middle partition has a certain thickness, for example, 1-5 cm. A number of through holes are evenly provided on the side walls of the middle slots, which is convenient for the glue to flow through the through holes in each middle slot when packaging the membrane module, so as to better bond the membrane filaments with the middle slots and the functional tubes with the middle slots.

[0067] Further optionally, sealing components are provided at the positions where the rods of the moving cleaning device penetrate the middle partition; or a first moving cleaning device is provided in the upper part of the filtration area 3, and a second moving cleaning device is provided in the lower part.

Claims

1. A membrane treatment device that can delay membrane fouling and is easy to clean, characterized in that: The main processor includes a concentrated water area, a filtration area and a water inlet area from top to bottom. An upper baffle is provided on the top of the filtration area and a lower baffle is provided on the bottom to separate the areas. The main processor is provided with at least one ultrafiltration membrane assembly, which includes an upper fixing block, a plurality of membrane filaments and a plurality of functional tubes, and a lower fixing block. The upper fixing block is located on the upper baffle, and the tops of the membrane filaments and the functional tubes pass through the upper baffle to connect to the upper fixing block. The lower fixing block is located below the lower baffle, and the bottoms of the membrane filaments and the functional tubes pass through the lower baffle to connect to the lower fixing block. A number of membrane filaments are distributed layer by layer from the outside to the inside on the cross-section of the ultrafiltration membrane assembly. A functional tube is provided between two adjacent inner and outer membrane filaments. Water and / or gas are input into the functional tube, and water and / or gas can be released to the surrounding membrane filaments, synergizing with the sewage or cleaning water inside the membrane filaments to reduce the deposition of dirt inside the membrane filaments or improve the cleaning efficiency of the membrane filaments.

2. The membrane treatment device according to claim 1, characterized in that: The membrane filaments and functional tubes of the ultrafiltration membrane assembly are integrally arranged in a cylindrical shape. A functional tube is arranged at the innermost center of the ultrafiltration membrane assembly, which is referred to as the central functional tube. A circle of membrane filaments is arranged outside the central functional tube, and then the functional tubes and membrane filaments are arranged outward layer by layer in an alternating order, and are arranged concentrically; each circle of membrane filaments consists of a plurality of membrane filaments uniformly arranged along the circumference of the circle, and each circle of functional tubes consists of a plurality of functional tubes uniformly arranged along the circumference of the circle; The functional tube is a slender flexible tube body with a hollow interior and evenly distributed through holes on the surface. The top end is closed and the bottom end is open, so that the clean water and / or gas inside the functional tube can be output from the functional tube through the through holes.

3. The membrane treatment device according to claim 2, characterized in that: According to the direction from the central functional tube to the outside of the ultrafiltration membrane assembly, the ratio of the number of membrane fibers in the membrane fiber layer is 6:12:18:24, and the number of membrane fiber layers is preferably 2-3 layers.

4. The membrane treatment device according to claim 3, characterized in that: A first circle of functional tubes is arranged between the first and second layers of membrane filaments, and a second circle of functional tubes is arranged between the second and third layers of membrane filaments; the first circle of functional tubes includes 3-4 functional tubes; the second circle of functional tubes includes 6-8 functional tubes; there is a gap between a circle of functional tubes and the inner and outer adjacent membrane filament layers to avoid direct contact between the membrane filaments and the functional tubes.

5. The membrane treatment device according to claim 1, characterized in that: The upper partition plate is provided with an upper slot at a position corresponding to the membrane wire and the functional tube. The upper slot is a through hole. The upper slot corresponds to the membrane wire and the functional tube one by one. The membrane wire and the functional tube pass through the upper slot and pass out of the upper partition plate. A plurality of through holes are evenly arranged on the side wall of the upper slot, so that when the membrane assembly is packaged, the glue flows through the through holes in each upper slot, so as to better bond the membrane wire and the upper slot, and the functional tube and the upper slot; The upper fixing block is connected to the upper partition. After the top ends of the membrane wires and the functional tubes pass through the upper partition, they are connected to the upper fixing block, which provides support for the membrane wires and the functional tubes.

6. The membrane treatment device according to claim 1, characterized in that: The lower partition plate is provided with a lower slot at a position corresponding to the membrane wire and the functional tube. The lower slot is a through hole. The lower slot corresponds to the membrane wire and the functional tube one by one. The membrane wire and the functional tube pass through the lower slot and go out of the lower partition plate. A plurality of through holes are evenly arranged on the side wall of the lower slot, so that when the membrane assembly is packaged, the glue flows through the through holes in each lower slot, so as to better bond the membrane wire and the lower slot, and the functional tube and the lower slot; The lower fixing block is connected to the lower partition plate. After the bottom ends of the membrane wire and the functional tube pass through the lower partition plate, they are connected to the lower fixing block, which provides support for the membrane wire and the functional tube.

7. The membrane treatment device according to claim 1, characterized in that: The bottom ends of all functional pipes are connected to an integrated pipe, which passes through the main processor and is then connected in parallel to a clean water source and an air inlet pipe to input clean water and / or gas into the functional pipes.

8. The membrane treatment device according to claim 2, characterized in that: The main processor is provided with a mobile cleaning device, which includes a telescopic device and a support frame with a defoaming brush. The telescopic device is set at a position selected from above the main processor, in the concentrated water area or at the top of the filtration area. The telescopic end of the telescopic device is connected to the top of the support frame to drive the support frame to move up and down; The support frame includes several cleaning components from top to bottom, and the cleaning components include several layers of support rings from inside to outside. The support rings are provided with several rotatable defoaming brushes. The support rings are located between two adjacent layers of membrane filaments and are used to clean bubbles on the outer wall of the membrane filaments.

9. The membrane treatment device according to claim 8, characterized in that: A raw water tank and a production water tank are also provided next to the main processor. The bottom of the main processor is connected to the raw water tank through an inlet pipe, and sewage is input into the water inlet area. At least one production water pipe is provided on the side corresponding to the filtration area, and the production water pipe is connected to the production water tank, and the production water obtained by membrane filtration is input into the production water tank. A concentrate water outlet is provided on the top of the main processor, and the concentrate water outlet is connected in parallel with the raw water tank and the production water tank. It can return the concentrate water generated by filtration to the raw water tank when treating sewage, and can also return the waste water after cleaning to the production water tank when cleaning the membrane.

10. The membrane treatment device according to claim 9, characterized in that: The water production box is provided with a cleaning outlet, which is connected in parallel to the water production pipe and the water inlet pipe through a pipeline. When used for membrane cleaning, the produced water is input into the filtration area and the water inlet area to clean the inside and outside of the membrane fibers.

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