A cleaning system for ultrafiltration membranes

Abstract

The utility model relates to high polymer material manufacturing technical field especially relates to a kind of cleaning system for ultrafiltration membrane, the structure of cleaning system for ultrafiltration membrane includes first holding tank, sodium hypochlorite solution is equipped in the first holding tank;Second holding tank, purified water is equipped in the second holding tank;Third holding tank, sodium bisulfite solution is equipped in the third holding tank;Cleaning storage tank, communication in the first holding tank The second holding tank and the third holding tank;Ultrafiltration membrane component, communication in the cleaning storage tank;And water circuit, communication in the ultrafiltration membrane component, the water circuit communication in the first holding tank The second holding tank and the third holding tank;Or the water circuit communication in the cleaning storage tank. The cleaning system for ultrafiltration membrane can solve the problem that existing cleaning process is difficult to meet production demand.

Description

Technical Field

[0001] This application relates to the field of polymer material manufacturing technology, and in particular to a cleaning system for ultrafiltration membranes. Background Technology

[0002] In the preparation of ultrafiltration membranes, porogens (such as polyvinylpyrrolidone, polyethylene glycol, etc.) are often added to form a porous structure. In the post-processing stage, thoroughly removing these porogens is crucial to ensuring membrane flux and product quality.

[0003] However, existing cleaning processes generally suffer from problems such as long cleaning cycles, significant water waste, and unstable cleaning results. Existing cleaning processes, such as high-temperature boiling or alkaline soaking, can take several days or even a week, severely limiting production efficiency and failing to meet the demands of large-scale continuous production. Furthermore, multiple and extensive rinsing processes result in enormous consumption of purified water, leading to high production costs and environmental problems. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a cleaning system for ultrafiltration membranes to solve the problem that existing cleaning processes cannot meet production needs.

[0005] According to this utility model, a cleaning system for an ultrafiltration membrane is provided, wherein the cleaning system for the ultrafiltration membrane includes: a first container tank containing a sodium hypochlorite solution; a second container tank containing purified water; a third container tank containing a sodium bisulfite solution; a cleaning storage tank connected to the first container tank, the second container tank, and the third container tank; an ultrafiltration membrane assembly connected to the cleaning storage tank; and a water circuit connected to the ultrafiltration membrane assembly, wherein the water circuit is connected to the first container tank, the second container tank, and the third container tank; or the water circuit is connected to the cleaning storage tank.

[0006] Preferably, the cleaning system for the ultrafiltration membrane further includes a heat exchange section disposed between the cleaning tank and the ultrafiltration membrane assembly. The solution in the cleaning tank flows to the heat exchange section for heating and then flows to the ultrafiltration membrane assembly.

[0007] Preferably, the heat exchange section includes: a heat exchanger connected to the cleaning tank and the ultrafiltration membrane module; a steam source connected to the heat exchanger; and a drainage passage connected to the heat exchanger; the steam in the steam source flows to the drainage passage after passing through the heat exchanger, and the solution in the cleaning tank flows to the ultrafiltration membrane module after passing through the heat exchanger.

[0008] Preferably, the cleaning system for the ultrafiltration membrane further includes a first pressure gauge, a first flow meter, and a temperature gauge, wherein the first pressure gauge, the first flow meter, and the temperature gauge are disposed on the pipeline connecting the cleaning tank to the heat exchange section.

[0009] Preferably, there are multiple ultrafiltration membrane modules, which are connected to the heat exchange section. A switching valve is provided at the connection between the ultrafiltration membrane module and the heat exchange section, and the multiple ultrafiltration membrane modules are connected to the water circuit.

[0010] Preferably, the water circuit includes a main circuit connected to the ultrafiltration membrane module, a residual chlorine analyzer and a conductivity meter installed on the main circuit, and the main circuit connected to the first container tank, the second container tank and the third container tank; multiple product water branches, each corresponding to one of the multiple ultrafiltration membrane modules, each product water branch equipped with a second flow meter and a first branch valve, and the multiple product water branches connected to the main circuit; and multiple concentrate branches, each corresponding to one of the multiple ultrafiltration membrane modules, each concentrate branch equipped with a second pressure gauge and a second branch valve, and the multiple concentrate branches connected to the main circuit.

[0011] Preferably, when the water circuit is connected to the first container tank, the second container tank, and the third container tank, the first container tank is provided with a first inlet valve at the connection point with the water circuit, and the first container tank is connected to a sodium hypochlorite liquid source through a first inlet pipe; the second container tank is provided with a second inlet valve at the connection point with the water circuit, and the second container tank is connected to a purified water liquid source through a second inlet pipe; the third container tank is provided with a third inlet valve at the connection point with the water circuit, and the third container tank is connected to a sodium bisulfite liquid source through a third inlet pipe.

[0012] Preferably, the first container tank, the second container tank, the third container tank, and the cleaning storage tank are provided with drain pipes, and drain valves are provided at the drain pipes.

[0013] Preferably, a hydraulic pump is provided between the first container tank and the cleaning storage tank, between the second container tank and the cleaning storage tank, between the third container tank and the cleaning storage tank, and between the heat exchange unit and the cleaning storage tank, and an inlet valve is provided at the hydraulic pump.

[0014] Preferably, when the water circuit is connected to the cleaning tank, the cleaning system for the ultrafiltration membrane further includes a mixing pipeline, the first end of which is connected to the cleaning tank, and the other end of which is connected between the hydraulic pump and the inlet valve between the heat exchange unit and the cleaning tank, and a mixing valve is provided on the mixing pipeline.

[0015] The ultrafiltration membrane cleaning system of this embodiment includes a first container filled with sodium hypochlorite solution, a second container filled with purified water, and a third container filled with sodium bisulfite solution. A cleaning tank is connected to the first, second, and third containers, allowing the solutions in these containers to be mixed and prepared within the cleaning tank. The ultrafiltration membrane module is connected to the cleaning tank, using the solution within the cleaning tank to clean the ultrafiltration membrane module, thereby effectively improving the cleaning effect and shortening the cleaning cycle. A water circuit is connected to the ultrafiltration membrane module, and also to the first, second, and third containers, or to the cleaning tank, allowing the water used to rinse the ultrafiltration membrane module to be recycled, thus greatly reducing the consumption of purified water. This effectively solves the problem that existing cleaning processes cannot meet production requirements.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of one embodiment of the cleaning system for ultrafiltration membranes according to the present invention.

[0019] Figure 2 This is a schematic diagram of another embodiment of the cleaning system for ultrafiltration membranes according to the present invention.

[0020] Reference numerals: 1-First container tank; 10-First inlet pipe; 11-First water inlet valve; 2-Second container tank; 20-Second inlet pipe; 21-Second water inlet valve; 3-Third container tank; 30-Third inlet pipe; 31-Third water inlet valve; 4-Cleaning tank; 41-Mixing pipeline; 42-Mixing valve; 5-Heat exchange section; 51-Heat exchanger; 52-Steam source; 53-Drainage passage; 530-Drain valve; 501-First Pressure gauge; 502-First flow meter; 503-Thermometer; 6-Ultrafiltration membrane module; 60-Switch valve; 7-Water circuit; 71-Main circuit; 72-Residual chlorine analyzer; 73-Product water branch; 731-First branch valve; 732-Second flow meter; 74-Concentrate branch; 741-Second branch valve; 742-Second pressure gauge; 75-Conductivity meter; 8-Drain pipe; 80-Drain valve; 9-Hydraulic pump; 90-Inlet valve. Detailed Implementation

[0021] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0022] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0023] Throughout the specification, when a component (such as a layer, region, or substrate) is described as being "on" another component, "attached" to another component, "bonded" to another component, "on" another component, or "covering" another component, it may be directly "on" another component, "attached" to another component, "bonded" to another component, "on" another component, or "covering" another component, or there may be one or more other components in between. In contrast, when a component is described as being "directly on" another component, "directly attached" to another component, "directly bonded" to another component, "directly on" another component, or "directly covering" another component, there may be no other components in between.

[0024] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0025] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0026] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one component and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, a component described as being “above” or “upper” relative to another component will subsequently be “below” or “lower” relative to that component. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, and / or combinations thereof.

[0028] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0029] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0030] This invention provides a cleaning system for ultrafiltration membranes, such as... Figure 1 and Figure 2 As shown, the cleaning system for the ultrafiltration membrane includes a first container tank 1, a second container tank 2, a third container tank 3, a cleaning tank 4, an ultrafiltration membrane module 6, and a water circuit 7.

[0031] In the following description, reference will be made to Figure 1 and Figure 2 The specific structure of the components of the cleaning system for ultrafiltration membranes and the connection relationship of the components are described in detail.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, the first container 1 can be used to contain sodium hypochlorite solution. The second container 2 can be used to contain purified water. The third container 3 can be used to contain sodium bisulfite solution. A cleaning tank 4 can be connected to the first container 1, the second container 2, and the third container 3, allowing the solutions in these containers to be mixed and prepared within the cleaning tank 4. The ultrafiltration membrane module 6 is connected to the cleaning tank 4, using the solution within the cleaning tank 4 to clean the ultrafiltration membrane module 6, thereby effectively improving the cleaning effect and shortening the cleaning cycle. A water circuit 7 is connected to the ultrafiltration membrane module 6, and simultaneously, the water circuit 7 is connected to the first container 1, the second container 2, and the third container 3, or to the cleaning tank 4, allowing the water used to rinse the ultrafiltration membrane module 6 to be recycled, thus greatly reducing the consumption of purified water. This effectively solves the problem that existing cleaning processes cannot meet production needs.

[0033] Preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the cleaning system for the ultrafiltration membrane may further include a heat exchanger 5. The heat exchanger 5 may be disposed between the cleaning tank 4 and the ultrafiltration membrane module 6 to heat the solution in the cleaning tank 4. After being heated by the heat exchanger 5, the solution in the cleaning tank 4 flows to the ultrafiltration membrane module 6, thereby improving the cleaning effect on the ultrafiltration membrane module 6.

[0034] Furthermore, preferably, such as Figure 1 and Figure 2As shown, in this embodiment, the heat exchange unit 5 may include a heat exchanger 51, a steam source 52, and a drainage passage 53. The heat exchanger 51 may be a plate heat exchanger 51. The heat exchanger 51 may be connected to the cleaning tank 4 and also to the ultrafiltration membrane module 6. The steam source 52 is connected to the heat exchanger 51 to provide heat to the heat exchanger 51. The drainage passage 53 is connected to the heat exchanger 51 to discharge condensate generated after steam cooling. A drain valve 530 may be provided at the drainage passage 53. During use, the solution in the cleaning tank 4 flows to the ultrafiltration membrane module 6 after passing through the heat exchanger 51, and the steam in the steam source 52 exchanges heat with the solution in the cleaning tank 4 after passing through the heat exchanger 51, and is discharged through the drainage passage 53 after cooling.

[0035] Further optimized, such as Figure 1 and Figure 2 As shown, in this embodiment, the cleaning system for the ultrafiltration membrane may further include a first pressure gauge 501, a first flow meter 502, and a temperature gauge 503. The first pressure gauge 501, the first flow meter 502, and the temperature gauge 503 may be installed on the pipeline connecting the cleaning tank 4 to the heat exchange section 5 to detect pressure, flow rate, and temperature.

[0036] In addition, preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the number of ultrafiltration membrane modules 6 can be multiple. Multiple ultrafiltration membrane modules 6 can all be connected to the heat exchange section 5 via pipelines. Each ultrafiltration membrane module 6 can be equipped with a switching valve 60 at the connection point between itself and the heat exchange section 5 to selectively clean the ultrafiltration membrane module 6. Multiple ultrafiltration membrane modules 6 are connected to the water circuit 7.

[0037] Preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the water circuit 7 may include a main circuit 71. The main circuit 71 is connected to the ultrafiltration membrane module 6, and a residual chlorine analyzer 72 is installed on the main circuit 71 to detect the residual chlorine concentration in the water in real time, serving as the basis for determining the termination step. A conductivity meter 75 is also installed on the main circuit 71 to detect the conductivity of the water. The main circuit 71 is connected to the first container tank 1, the second container tank 2, and the third container tank 3, or the main circuit 71 is connected to the cleaning storage tank 4.

[0038] Furthermore, preferably, such as Figure 1 and Figure 2As shown, in this embodiment, the water circuit 7 may further include multiple product water branches 73 and multiple concentrate branches 74. The multiple product water branches 73 can be connected one-to-one with the sides of multiple ultrafiltration membrane modules 6. Each product water branch 73 is equipped with a second flow meter 732 and a first branch valve 731 for detecting water flow. The multiple product water branches 73 can be connected to the main circuit 71. The multiple concentrate branches 74 can be connected one-to-one with the tops of the multiple ultrafiltration membrane modules 6. Each concentrate branch 74 can be equipped with a second pressure gauge 742 and a second branch valve 741 for detecting water pressure. The multiple concentrate branches 74 can be connected to the main circuit 71. The operator can selectively open any of the first branch valves 731 and second branch valves 741 as needed.

[0039] Further optimized, such as Figure 1 As shown, in this embodiment, when the water circuit connects the first container tank, the second container tank, and the third container tank, the first container tank 1 may also be equipped with a first inlet valve 11 at its connection with the water circuit 7. After opening the first inlet valve 11, circulating water can flow into the first container tank 1. The first container tank 1 can be connected to a sodium hypochlorite source via a first inlet pipe 10 to prepare a sodium hypochlorite solution within the first container tank 1. The second container tank 2 may be equipped with a second inlet valve 21 at its connection with the water circuit 7. After opening the second inlet valve 21, circulating water can flow into the second container tank 2. The second container tank 2 can be connected to a purified water source via a second inlet pipe 20 to replenish purified water into the second container tank 2. The third container tank 3 may also be equipped with a third inlet valve 31 at its connection with the water circuit 7. After opening the third inlet valve 31, circulating water can flow into the third container tank 3. The third container 3 can be connected to a sodium bisulfite liquid source through a third inlet pipe 30 to prepare a sodium bisulfite solution within the third container 3.

[0040] Preferred, such as Figure 1 and Figure 2 As shown in the embodiment, the first container tank 1, the second container tank 2, the third container tank 3, and the cleaning storage tank 4 may also be equipped with drain pipes 8. A drain valve 80 may be installed at the drain pipe 8; opening the drain valve 80 allows the solution in the container to be emptied and the container to be rinsed with water. Furthermore, hydraulic pumps 9 may be installed between the first container tank 1 and the cleaning storage tank 4, between the second container tank 2 and the cleaning storage tank 4, between the third container tank 3 and the cleaning storage tank 4, and between the heat exchange unit 5 and the cleaning storage tank 4 to increase the hydraulic pressure required for fluid flow. An inlet valve 90 may also be installed at the hydraulic pump 9 (i.e., on the pipeline where the hydraulic pump 9 is installed) to control the fluid flow.

[0041] Furthermore, preferably, such as Figure 2 As shown, in this embodiment, when the water circuit 7 is connected to the cleaning tank 4, the cleaning system for the ultrafiltration membrane may further include a mixing pipeline 41. One end of the mixing pipeline 41 may be connected to the cleaning tank 4, and the other end may be connected between the hydraulic pump 9 and the inlet valve 90 between the heat exchange unit 5 and the cleaning tank 4. A mixing valve 42 is provided on the mixing pipeline 41. This arrangement allows the circulating water in the water circuit 7 to directly return to the cleaning tank 4. The operator can turn on the hydraulic pump 9 and the mixing valve 42 and close the inlet valve 90, allowing the solution in the cleaning tank 4 to be mixed evenly within the mixing pipeline 41.

[0042] During use, the ultrafiltration membrane module 6 to be cleaned can first be placed in the ultrafiltration membrane cleaning system and circulated with hot water at a temperature of 40-45℃ for 1-2 hours. This step aims to soften the pore-forming agent, weaken its binding force with the membrane material, create favorable conditions for subsequent chemical cleaning, and avoid high energy consumption and membrane damage caused by high temperature. After draining the hot water, a sodium hypochlorite solution with a concentration of 0.05%-0.3% (w / w) is pumped into the system and circulated for 3-5 hours at the same temperature (40℃-45℃). The oxidizing effect of sodium hypochlorite can effectively decompose the softened pore-forming agent molecules. After circulation is complete, the sodium hypochlorite in the pipeline is drained, and circulating water is introduced for 30-60 minutes. Then, a sodium bisulfite solution with a concentration of 0.05%-0.5% (w / w) is pumped into the system and circulated for 30-60 minutes. This concentration range, calculated and experimentally verified, ensures complete neutralization of residual sodium hypochlorite (residual chlorine ≤ 0.1 ppm) while avoiding the introduction of new residues or unnecessary corrosion to the equipment due to excessive reducing agent. After draining the sodium bisulfite solution, flush the system with purified water for 30-60 minutes until the effluent quality (e.g., conductivity) meets the standards. Finally, perform a flux performance test on ultrafiltration membrane module 6 to verify that it has recovered to the rated flux.

[0043] The cleaning system for the ultrafiltration membrane reduces the traditional 7-10 day cleaning cycle to 4-8 hours, improving efficiency by over 90% and meeting the needs of continuous industrial production. It employs a gentle hot cleaning process at 40℃-45℃, reducing energy consumption by over 50% compared to traditional 80℃-90℃ high-temperature cooking. Furthermore, by optimizing the process and clearly defining the cleaning endpoint, total water consumption is reduced by over 60%. The process parameters (temperature, concentration, and time) are clearly defined, facilitating standardization and automated control, reducing human error, and thoroughly removing residual oxidants through a reduction step, avoiding potential damage to the membrane material and ensuring membrane flux recovery and batch-to-batch stability.

[0044] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cleaning system for an ultrafiltration membrane, characterized in that, The cleaning system for the ultrafiltration membrane includes: A first container, which contains a sodium hypochlorite solution; The second container is filled with purified water; A third container is provided, which contains a sodium bisulfite solution; A cleaning storage tank is connected to the first container tank, the second container tank, and the third container tank; An ultrafiltration membrane module, connected to the cleaning tank; and A water circuit is connected to the ultrafiltration membrane assembly, and the water circuit is connected to the first container tank, the second container tank, and the third container tank; Alternatively, the water circuit may be connected to the cleaning storage tank.

2. The cleaning system for ultrafiltration membranes according to claim 1, characterized in that, The cleaning system for the ultrafiltration membrane also includes a heat exchanger, which is disposed between the cleaning tank and the ultrafiltration membrane module. The solution in the cleaning tank flows to the heat exchanger for heating and then flows to the ultrafiltration membrane module.

3. The cleaning system for ultrafiltration membranes according to claim 2, characterized in that, The heat exchange section includes: A heat exchanger is connected to the cleaning tank, and the heat exchanger is connected to the ultrafiltration membrane module; A steam source, connected to the heat exchanger; and A drainage passage, connected to the heat exchanger; The steam in the steam source flows to the drainage passage after passing through the heat exchanger, and the solution in the cleaning tank flows to the ultrafiltration membrane module after passing through the heat exchanger.

4. The cleaning system for ultrafiltration membranes according to claim 2, characterized in that, The cleaning system for the ultrafiltration membrane also includes a first pressure gauge, a first flow meter, and a temperature gauge, which are installed on the pipeline connecting the cleaning tank to the heat exchange section.

5. The cleaning system for ultrafiltration membranes according to claim 2, characterized in that, The number of ultrafiltration membrane modules is multiple, and the multiple ultrafiltration membrane modules are connected to the heat exchange section. A switching valve is provided at the connection between the ultrafiltration membrane module and the heat exchange section, and the multiple ultrafiltration membrane modules are connected to the water circuit.

6. The cleaning system for ultrafiltration membranes according to claim 5, characterized in that, The water circuit includes: The main circuit is connected to the ultrafiltration membrane module. A residual chlorine analyzer and a conductivity meter are installed on the main circuit. The main circuit is connected to the first container tank, the second container tank, and the third container tank, or the main circuit is connected to the cleaning storage tank. Multiple permeate branches are connected to multiple ultrafiltration membrane modules one-to-one. Each permeate branch is equipped with a second flow meter and a first branch valve. The multiple permeate branches are connected to the main circuit. Multiple concentrate branches are connected to multiple ultrafiltration membrane modules one by one. Each concentrate branch is equipped with a second pressure gauge and a second branch valve. The multiple concentrate branches are connected to the main circuit.

7. The cleaning system for ultrafiltration membranes according to claim 1, characterized in that, When the water circuit is connected to the first container tank, the second container tank and the third container tank, the first container tank is provided with a first water inlet valve at the connection point with the water circuit, and the first container tank is connected to the sodium hypochlorite liquid source through a first liquid inlet pipe. The second container is provided with a second water inlet valve at the connection point with the water circuit, and the second container is connected to the purified water source through a second liquid inlet pipe; The third container is equipped with a third inlet valve at the connection point with the water circuit, and the third container is connected to the sodium bisulfite liquid source through a third liquid inlet pipe.

8. The cleaning system for ultrafiltration membranes according to claim 1, characterized in that, The first container tank, the second container tank, the third container tank, and the cleaning storage tank are equipped with drain pipes, and drain valves are installed at the drain pipes.

9. The cleaning system for ultrafiltration membranes according to claim 2, characterized in that, A hydraulic pump is provided between the first container tank and the cleaning storage tank, between the second container tank and the cleaning storage tank, between the third container tank and the cleaning storage tank, and between the heat exchange unit and the cleaning storage tank. An inlet valve is provided at the hydraulic pump.

10. The cleaning system for ultrafiltration membranes according to claim 9, characterized in that, When the water circuit is connected to the cleaning tank, the cleaning system for the ultrafiltration membrane also includes a mixing pipeline. The first end of the mixing pipeline is connected to the cleaning tank, and the other end of the mixing pipeline is connected between the hydraulic pump and the inlet valve between the heat exchange unit and the cleaning tank. A mixing valve is provided on the mixing pipeline.

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