Novel submersible ultrafiltration system and lifting device thereof

Abstract

The utility model provides a novel submersion type ultrafiltration system and hoist device thereof, including operation ultrafiltration membrane pool, ultrafiltration water distribution ditch and overhaul membrane pool, two parallelly arranged operation ultrafiltration membrane pools are symmetrically arranged in the both sides of ultrafiltration water distribution ditch along the first direction, and are connected with ultrafiltration water distribution ditch through first water inlet pipeline, and ultrafiltration water distribution ditch extends along the second direction, and the overhaul membrane pool is arranged on the side far from the water inlet of ultrafiltration water distribution ditch, and the bottom of overhaul membrane pool is provided with the water inlet and the middle opening of one end of ultrafiltration water distribution ditch far from the water inlet end and is connected through pipeline, there is transparent cover plate and ultrafiltration membrane assembly fixing device in the overhaul membrane pool, and the transparent cover plate is arranged on the top of overhaul membrane pool, and the ultrafiltration membrane assembly fixing device is arranged in the overhaul membrane pool, and the installation positioning size is consistent with the operation ultrafiltration membrane pool, the above-mentioned submersion type ultrafiltration system standard ultrafiltration membrane assembly hoist operation and satisfy storage condition, reduce the damage of overhaul to ultrafiltration membrane assembly, prolong the service life of ultrafiltration membrane.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial water supply and drainage, specifically a novel submersible ultrafiltration system and its lifting device. Background Technology

[0002] Submerged ultrafiltration (UFR) is widely used in wastewater reuse and material separation processes in industries such as metal smelting, combined heat and power (CHP), and food processing due to its excellent antifouling capabilities, particularly strong alkali resistance, and highly efficient chemical cleaning. A submerged UFR system consists of a water distribution channel (pipe), membrane tank, ultrafiltration membrane, permeate pump, backwash pump, dosing system, and supporting piping. The core process involves installing the ultrafiltration membrane in the membrane tank, ensuring the water level in the tank is below the membrane. During operation, starting the permeate pump creates negative pressure inside the ultrafiltration membrane fibers, drawing water from the membrane tank into the membrane fibers and collecting it in the main permeate pipe to form ultrafiltration permeate.

[0003] The membrane tank is a crucial component of an ultrafiltration system. It is typically a concrete structure with an internal polyurea coating for corrosion protection, and aeration equipment is located at the bottom. Currently, the conventional design involves one membrane tank for each ultrafiltration membrane module to ensure normal operation. For ease of maintenance, a water tank might be installed nearby to place the ultrafiltration membrane during repairs. However, this design has several drawbacks during operation.

[0004] When the anti-corrosion layer of the tank peels off or the aeration system malfunctions, the entire membrane module needs to be hoisted. Current specifications only recommend setting up a temporary water storage tank, but the lack of modular fixing supports leads to stacked storage of modules and excessive interfacial contact stress. Operating units without dedicated maintenance water tanks are forced to use non-standard storage and transportation solutions. The lack of guiding and positioning devices causes excessive swinging of the modules during hoisting, and the lack of humidity and temperature control in the water storage unit leads to dehydration of the ultrafiltration membrane fibers and mechanical damage to the membrane module. This is a major cause of ultrafiltration membrane fiber breakage and one of the main factors shortening the service life of ultrafiltration systems.

[0005] To address these issues, a novel submersible ultrafiltration system is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a novel submerged ultrafiltration system to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a novel submerged ultrafiltration system, comprising an operating ultrafiltration membrane tank, an ultrafiltration water distribution channel, and a maintenance membrane tank.

[0008] Two parallel ultrafiltration membrane tanks are symmetrically arranged on both sides of the ultrafiltration water distribution channel along a first direction and are connected to the ultrafiltration water distribution channel through a first inlet pipe. The ultrafiltration water distribution channel extends along a second direction, and the first direction is perpendicular to the second direction.

[0009] The maintenance membrane tank is located on the side away from the inlet of the ultrafiltration water distribution channel. The bottom of the maintenance membrane tank has an inlet that is connected to the middle opening of the end of the ultrafiltration water distribution channel away from the inlet end via a pipe.

[0010] The maintenance membrane tank includes a transparent cover and an ultrafiltration membrane module fixing device. The transparent cover is located at the top of the maintenance membrane tank. The ultrafiltration membrane module fixing device is located in the maintenance membrane tank, and its installation and positioning dimensions are consistent with those in the operating ultrafiltration membrane tank.

[0011] Furthermore, a first inlet valve is provided on the first inlet pipe, a first drain pipe is connected between the first inlet valve and the operating ultrafiltration membrane tank, and the first drain pipe is connected to a drainage ditch, and a first drain valve is provided on the first drain pipe.

[0012] Furthermore, the maintenance membrane tank and the ultrafiltration water distribution channel are connected through a second inlet pipe, a second inlet valve is installed on the second inlet pipe, a second drain pipe is connected between the second inlet valve and the maintenance membrane tank, and the second drain pipe is connected to the drainage channel, and a second drain valve is installed on the second drain pipe.

[0013] Furthermore, the transparent cover is flush with the ground.

[0014] Furthermore, the ultrafiltration membrane module fixing device adopts a maintenance membrane tank frame, which includes a fixed bracket and a working bracket, and the maintenance membrane tank frame extends along a first direction;

[0015] The fixed bracket is located on the top of the side wall of the maintenance membrane tank and is fixedly connected to the maintenance membrane tank. The working bracket is detachably connected to the fixed bracket. The working bracket is provided with a support rod for fixing the ultrafiltration membrane module and the support rod extends in a third direction.

[0016] Furthermore, the submersible ultrafiltration system also includes a self-ultrafiltration water supply pump and a self-cleaning filter; the ultrafiltration water supply pump and the self-cleaning filter are located on one side of the inlet of the ultrafiltration water distribution channel; the outlet of the ultrafiltration water supply pump is connected to the inlet of the self-cleaning filter through a first pipe, and the outlet of the self-cleaning filter is connected to the inlet of the ultrafiltration water distribution channel through a second pipe.

[0017] Furthermore, the submerged ultrafiltration system also includes an ultrafiltration product water tank, and the outlet of the operating ultrafiltration membrane tank is connected to the ultrafiltration product water tank.

[0018] A lifting device is used above the submerged ultrafiltration system, wherein the maintenance membrane tank and the operating ultrafiltration membrane tank share the same lifting device.

[0019] Furthermore, the lifting device adopts a U-shaped horizontal rail crane, and the crane rail of the U-shaped horizontal rail crane is arranged above the operating ultrafiltration membrane tank and the maintenance membrane tank.

[0020] Analysis shows that this utility model provides a novel submerged ultrafiltration system, including an operating ultrafiltration membrane tank, an ultrafiltration water distribution channel, and a maintenance membrane tank. Two parallel rows of operating ultrafiltration membrane tanks are symmetrically arranged on both sides of the ultrafiltration water distribution channel along a first direction and connected to the ultrafiltration water distribution channel through a first inlet pipe. The ultrafiltration water distribution channel extends along a second direction, with the first direction perpendicular to the second direction. The regular arrangement of the operating membrane tanks on both sides of the ultrafiltration water distribution channel improves the utilization of the site and provides a reasonable space for subsequent hoisting processes. The operation path minimizes the time spent hoisting the ultrafiltration membrane module. The maintenance membrane tank is located on the side away from the inlet of the ultrafiltration water distribution channel to reduce subsequent hoisting time and the swaying amplitude of the ultrafiltration membrane module during hoisting, thus preventing mechanical damage. The bottom of the maintenance membrane tank has an inlet connected to the middle opening at the end of the ultrafiltration water distribution channel away from the inlet end via a pipe, allowing water from the ultrafiltration water distribution channel to be directly transported to the maintenance membrane tank, ensuring consistent water quality between the operating and maintenance membrane tanks. This invention prevents damage to the ultrafiltration membrane module from changes in humidity and temperature within the maintenance membrane tank, and improves system efficiency. The maintenance membrane tank includes a transparent cover and an ultrafiltration membrane module fixing device. The transparent cover is located at the top of the maintenance membrane tank, ensuring easy observation of the ultrafiltration membrane module while protecting the tank from external influences. The ultrafiltration membrane module fixing device is positioned within the maintenance membrane tank, with dimensions identical to those in the operating ultrafiltration membrane tank. This ensures the ultrafiltration membrane module is immersed in the maintenance membrane tank at the same humidity and temperature as in the operating ultrafiltration membrane tank, preventing dehydration of the ultrafiltration membrane fibers due to humidity and temperature changes. This also reduces the impact of external factors on the ultrafiltration membrane module and prevents stacking and damage during maintenance. In summary, this invention standardizes the hoisting operation of ultrafiltration membrane modules and meets storage conditions, reducing damage during maintenance and extending the service life of the ultrafiltration membrane modules.

[0021] Compared with the closest existing technology, the technical solution provided by this utility model has the following advantages:

[0022] In response to the current situation where the anti-corrosion layer of the ultrafiltration membrane tank peels off or the aeration system malfunctions, requiring the overall hoisting of the membrane module, current specifications only recommend setting up a temporary water storage tank. If the operating unit does not have a dedicated maintenance water tank, it is forced to adopt a non-standard storage and transportation solution. This utility model unifies the operation of the ultrafiltration membrane tank and the maintenance membrane tank by using a single ultrafiltration water distribution channel, so that the ultrafiltration membrane module is in a relatively stable humidity and temperature environment, and reduces the hoisting time of the ultrafiltration membrane module, thus reducing damage to the ultrafiltration membrane module. Attached Figure Description

[0023] Figure 1 This is a diagram of the ultrafiltration process system of this utility model.

[0024] Figure 2 This is a schematic diagram of the newly added maintenance tank for ultrafiltration in this utility model embodiment.

[0025] Figure 3 This is a schematic diagram of the ultrafiltration membrane module fixing device according to an example of this utility model.

[0026] In the diagram: 1. Operating ultrafiltration membrane tank; 2. Ultrafiltration water distribution channel; 3. Maintenance membrane tank; 4. First inlet pipe; 5. Transparent cover; 6. Ultrafiltration membrane module fixing device; 7. First inlet valve; 8. First drain pipe; 9. First drain valve; 10. Second inlet pipe; 11. Second inlet valve; 12. Second drain pipe; 13. Second drain valve; 14. Fixed bracket; 15. Working bracket; 16. Support rod; 17. Ultrafiltration water supply pump; 18. Self-cleaning filter; 19. First pipe; 20. Second pipe; 21. Ultrafiltration permeate tank. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0031] like Figure 1 As shown, this utility model provides a technical solution: a novel submerged ultrafiltration system, including an operating ultrafiltration membrane tank 1, an ultrafiltration water distribution channel 2, and a maintenance membrane tank 3.

[0032] Two parallel ultrafiltration membrane tanks 1 are symmetrically arranged on both sides of the ultrafiltration water distribution channel 2 along a first direction and connected to the ultrafiltration water distribution channel 2 through a first water inlet pipe 4. The ultrafiltration water distribution channel 2 extends along a second direction, with the first direction perpendicular to the second direction. This improves the utilization rate of the site and provides a reasonable movement trajectory for the subsequent lifting device, shortens the time of the ultrafiltration membrane module during the lifting process, and reduces damage to the ultrafiltration membrane module.

[0033] The maintenance membrane tank 3 is located on the side away from the inlet of the ultrafiltration water distribution channel 2. The bottom of the maintenance membrane tank 3 has an inlet that is connected to the middle opening of the end of the ultrafiltration water distribution channel 2 away from the inlet end through a pipe. This connects the maintenance membrane tank 3 to the ultrafiltration water distribution channel 2, making it no longer a temporary maintenance device, improving the utilization rate of the device, reducing costs, further shortening the time of ultrafiltration membrane module hoisting, reducing mechanical damage to the ultrafiltration membrane module, and ensuring that the humidity and temperature of the ultrafiltration membrane module in the maintenance membrane tank 3 are consistent with those in the operating membrane tank 1, further reducing damage to the ultrafiltration membrane module.

[0034] The maintenance membrane tank 3 includes a transparent cover plate 5 and an ultrafiltration membrane module fixing device 6. The fiberglass cover plate 5 is located on the top of the maintenance membrane tank 3. The transparent cover plate 5 allows for observation of the ultrafiltration membrane module in the maintenance membrane tank 3, facilitating timely and effective measures. Furthermore, the transparent cover plate 5 isolates the ultrafiltration membrane module from the outside environment, reducing the impact of external factors. The ultrafiltration membrane module fixing device 6 is located in the maintenance membrane tank 3 and its installation and positioning dimensions are consistent with those in the operating ultrafiltration membrane tank 3. This ensures that the ultrafiltration membrane modules do not stack in the maintenance membrane tank 3, improving the utilization rate of the maintenance membrane tank.

[0035] Preferably, a first inlet valve 7 is provided on the first inlet pipe 4, a first drain pipe 8 is connected between the first inlet valve 7 and the operating ultrafiltration membrane tank 1, and the first drain pipe 8 is connected to a drainage ditch, and a first drain valve 9 is provided on the first drain pipe 8.

[0036] During normal operation, by opening the first inlet valve 7 and closing the first drain valve 9, water in the ultrafiltration water distribution channel 2 flows into the operating ultrafiltration membrane tank 1 through the first inlet pipe 4. When the operating ultrafiltration membrane tank 1 needs maintenance, the first inlet valve 7 is closed and the first drain valve 9 is opened to drain the water from the operating ultrafiltration membrane tank 1. The filling and draining of water in the operating ultrafiltration membrane tank 1 are achieved through the first inlet valve 7 and the first drain valve 9, thereby improving the operating efficiency of the device.

[0037] Preferably, the maintenance membrane tank 3 is connected to the ultrafiltration water distribution channel 2 through a second inlet pipe 10, a second inlet valve 11 is installed on the second inlet pipe 10, a second drain pipe 12 is connected between the second inlet valve 11 and the maintenance membrane tank 3, and the second drain pipe 12 is connected to the drainage channel, and a second drain valve 13 is provided on the second drain pipe 12.

[0038] When the ultrafiltration membrane tank 1 needs maintenance, open the second inlet valve 11 and close the second drain valve 13 to ensure that the water in the ultrafiltration water distribution channel 2 enters the maintenance membrane tank 3 through the second inlet pipe 10. After the water level reaches the designated position, close the second inlet valve 11. After the maintenance is completed, open the second drain valve 13 to drain the water in the maintenance membrane tank 3 into the drainage channel. The water level in the maintenance membrane tank 3 is controlled by the second inlet valve 11 and the second drain valve 13. The maintenance membrane tank 3 is connected to the ultrafiltration water distribution channel 2 to reduce damage to the ultrafiltration membrane module. The maintenance membrane tank 3 can be reused.

[0039] More preferably, sodium hypochlorite is added to the membrane tank 3 for soaking, and the water is changed and sodium hypochlorite is added once a week. The purpose is to prevent the growth of microorganisms and further improve the protection of the ultrafiltration membrane module.

[0040] Preferably, the transparent cover 5 is flush with the ground to facilitate observation of the membrane tank 3 during maintenance.

[0041] More preferably, the transparent cover plate 5 is made of fiberglass, which has the advantages of strong rust resistance, low cost, and high strength and toughness.

[0042] Preferably, the ultrafiltration membrane module fixing device 6 adopts a maintenance membrane tank frame, which includes a fixed bracket 14 and a working bracket 15, and the maintenance membrane tank frame extends along a first direction.

[0043] The fixed bracket 14 is located on the top of the side wall of the maintenance membrane tank 3. The fixed bracket 14 is fixedly connected to the maintenance membrane tank 3. The working bracket 15 is detachably connected to the fixed bracket 14. The working bracket 15 is provided with a support rod 16 for fixing the ultrafiltration membrane assembly. The support rod 16 extends in a third direction.

[0044] The ultrafiltration membrane modules are fixed by the membrane frame in the maintenance membrane tank. Specifically, the support rod 16 extends into the ultrafiltration membrane module to ensure that the ultrafiltration membrane modules are arranged regularly in the maintenance membrane tank 3. The working bracket 15 is connected to the fixed bracket 14 fixed to the top of the side wall of the maintenance membrane tank 3 to ensure that the ultrafiltration membrane modules do not stack and cause damage to the ultrafiltration membrane modules.

[0045] Preferably, the submersible ultrafiltration system further includes a self-ultrafiltration water supply pump 17 and a self-cleaning filter 18.

[0046] The ultrafiltration water supply pump 17 and the self-cleaning filter 18 are arranged on one side of the inlet of the ultrafiltration water distribution channel 2; the outlet of the ultrafiltration water supply pump 17 is connected to the inlet of the self-cleaning filter 18 through the first pipe 19, and the outlet of the self-cleaning filter 18 is connected to the inlet of the ultrafiltration water distribution channel 2 through the second pipe 2.

[0047] Water is delivered to the self-cleaning filter 18 via the ultrafiltration water supply pump 17, and the filtered water is then sent to the ultrafiltration water distribution channel 2. This ensures that the water entering the operating ultrafiltration membrane tank 1 and the maintenance membrane tank 3 is filtered, thus preventing impurities in the water from affecting the ultrafiltration membrane module. If the water is not filtered, microorganisms may grow on the ultrafiltration membrane module.

[0048] Preferably, the submerged ultrafiltration system further includes an ultrafiltration product water tank 21, and the outlet of the operating ultrafiltration membrane tank 1 is connected to the ultrafiltration product water tank 21 to send the water that has passed through the operating ultrafiltration membrane tank 1 to the ultrafiltration product water tank 21, providing it with a device to accommodate the water and improving the system's working efficiency.

[0049] A lifting device is used above an immersion ultrafiltration system. The maintenance membrane tank 3 and the operating ultrafiltration membrane tank 1 share the same lifting device. The purpose is to reduce the lifting time of the ultrafiltration membrane module from the operating ultrafiltration membrane tank 1 to the maintenance membrane tank 3 and reduce damage to the ultrafiltration membrane module due to excessive lifting time.

[0050] More preferably, the lifting device adopts a U-shaped horizontal rail crane. The use of a U-shaped horizontal rail crane enhances the stability during the lifting process of the ultrafiltration membrane module. The crane track is arranged above the operating ultrafiltration membrane tank 1 and the maintenance membrane tank 2, providing a reasonable track path for the crane and improving the lifting efficiency.

[0051] The normal operating process of this system is as follows:

[0052] Open the first inlet valve 7, close the first drain valve 9, close the second inlet valve 11, open the second drain valve 13, and send water to the self-cleaning filter 18 through the ultrafiltration water supply pump 17, then to the ultrafiltration water distribution channel 2, and then to the operating ultrafiltration membrane tank 1 through the first inlet pipe 4. Finally, send the filtered water to the ultrafiltration product water tank 21.

[0053] The following is the procedure for overhauling the ultrafiltration membrane tank in this system:

[0054] Close the first inlet valve 7 of the operating ultrafiltration membrane tank 1 to be inspected, open the first drain valve 9, open the second inlet valve 11, close the second drain valve 13, when the water level in the inspection membrane tank 3 reaches the designated position, close the second inlet valve 11, lift the ultrafiltration membrane module in the operating ultrafiltration membrane tank 1 into the inspection membrane tank using the lifting device, fix it in the inspection membrane tank 3 using the ultrafiltration membrane module fixing device, add sodium hypochlorite for soaking, and cover the inspection membrane tank 3 with the transparent cover plate 5.

[0055] In summary, this utility model achieves the following technical effects:

[0056] 1) When the anti-corrosion layer of the ultrafiltration membrane layer peels off or the aeration system malfunctions, it is necessary to hoist the entire membrane module. Current specifications only recommend the use of temporary water storage tanks, but lack modular fixing supports, resulting in stacked storage of modules and excessive interfacial contact stress. This utility model provides a standardized hoisting operation for ultrafiltration membrane modules and a submerged ultrafiltration system that meets storage conditions. By connecting both the operating ultrafiltration membrane tank 1 and the maintenance membrane tank 3 to the ultrafiltration water distribution channel 2, the hoisting distance of the ultrafiltration membrane modules is shortened. Furthermore, an ultrafiltration membrane module fixing device is installed in the maintenance membrane tank 3 to prevent the ultrafiltration membrane modules from stacking.

[0057] 2) The water in the ultrafiltration water distribution channel 2 is regulated to enter the operating ultrafiltration membrane tank 1 and the maintenance membrane tank 2 through the first inlet valve 7, the first outlet valve 9, the second inlet valve 11 and the second outlet valve 13 respectively, so that the system can be adjusted in normal operation mode and when the membrane tank needs maintenance, thereby improving the system's working efficiency.

[0058] 3) By covering the top of the maintenance membrane tank 3 with a transparent cover plate 5, the interior of the maintenance membrane tank 3 will not be affected by external factors, and the interior of the maintenance membrane tank 3 can be observed, so that relevant operations can be carried out at any time according to the actual situation.

[0059] 4) The ultrafiltration membrane module placed in the maintenance membrane tank 3 is fixed by the membrane frame in the maintenance membrane tank to prevent the ultrafiltration membrane module from stacking in the maintenance membrane tank 3 and causing damage to the ultrafiltration membrane module.

[0060] 5) The same lifting structure is used for the operation of ultrafiltration membrane tank 1 and the maintenance membrane tank 3 to avoid changing the lifting device midway, which would prolong the lifting time of the ultrafiltration membrane module and thus affect the ultrafiltration membrane module.

[0061] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel submersible ultrafiltration system, characterized in that, This includes operating ultrafiltration membrane tanks, ultrafiltration water distribution channels, and maintenance membrane tanks; Two parallel ultrafiltration membrane tanks are symmetrically arranged on both sides of the ultrafiltration water distribution channel along a first direction and are connected to the ultrafiltration water distribution channel through a first inlet pipe. The ultrafiltration water distribution channel extends along a second direction, and the first direction is perpendicular to the second direction. The maintenance membrane tank is located on the side away from the inlet of the ultrafiltration water distribution channel. The bottom of the maintenance membrane tank is provided with an inlet that is connected to the middle opening of the end of the ultrafiltration water distribution channel away from the inlet end through a pipe. The maintenance membrane tank includes a transparent cover and an ultrafiltration membrane module fixing device. The transparent cover is located at the top of the maintenance membrane tank. The ultrafiltration membrane module fixing device is located in the maintenance membrane tank, and its installation and positioning dimensions are consistent with those in the operating ultrafiltration membrane tank.

2. The submersible ultrafiltration system according to claim 1, characterized in that, A first inlet valve is provided on the first inlet pipe, and a first drain pipe is connected between the first inlet valve and the operating ultrafiltration membrane tank. The first drain pipe is also connected to a drainage ditch, and a first drain valve is provided on the first drain pipe.

3. The submersible ultrafiltration system according to claim 1, characterized in that, The maintenance membrane tank and the ultrafiltration water distribution channel are connected by a second inlet pipe. A second inlet valve is installed on the second inlet pipe. A second drain pipe is connected between the second inlet valve and the maintenance membrane tank, and the second drain pipe is connected to the drainage channel. A second drain valve is installed on the second drain pipe.

4. The submersible ultrafiltration system according to claim 1, characterized in that, The transparent cover is flush with the ground.

5. The submersible ultrafiltration system according to claim 1, characterized in that, The ultrafiltration membrane module fixing device adopts a maintenance membrane tank frame, which includes a fixed bracket and a working bracket, and the maintenance membrane tank frame extends along a first direction. The fixed bracket is located on the top of the side wall of the maintenance membrane tank and is fixedly connected to the maintenance membrane tank. The working bracket is detachably connected to the fixed bracket. The working bracket is provided with a support rod for fixing the ultrafiltration membrane module and the support rod extends in a third direction.

6. The submersible ultrafiltration system according to claim 1, characterized in that, It also includes a self-ultrafiltration water supply pump and a self-cleaning filter; The ultrafiltration water supply pump and the self-cleaning filter are located on one side of the inlet of the ultrafiltration water distribution channel; The outlet of the ultrafiltration water supply pump is connected to the inlet of the self-cleaning filter through a first pipe, and the outlet of the self-cleaning filter is connected to the inlet of the ultrafiltration water distribution channel through a second pipe.

7. The submersible ultrafiltration system according to claim 1, characterized in that, It also includes an ultrafiltration permeate tank, and the outlet of the operating ultrafiltration membrane tank is connected to the ultrafiltration permeate tank.

8. A lifting device, applied above the submersible ultrafiltration system, characterized in that, The maintenance membrane tank and the operating ultrafiltration membrane tank, as described in claim 1, share the same lifting device.

9. The lifting device according to claim 8, characterized in that, The lifting device is a U-shaped horizontal rail crane, and the crane rail of the U-shaped horizontal rail crane is arranged above the operating ultrafiltration membrane tank and the maintenance membrane tank.

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