A method and system for treating reverse osmosis microbial contamination

Abstract

This invention relates to the field of water treatment technology, and more particularly to a method and system for treating microbial contamination in reverse osmosis systems. The system includes at least two parallel filters; controlling the filters to switch between oxidative sterilization and reduction states while simultaneously monitoring their operational information; and determining whether the filter cartridges need replacement based on the operational information. The reverse osmosis microbial contamination treatment system and method proposed in this invention uses a security filter comprising two independent filter membrane housings, enabling continuous operation of the reverse osmosis equipment. Oxidizing chlorine-containing reverse osmosis feed water passes through one of the security filter membrane housings, placing it in an oxidative sterilization state without the need for additional chemical addition, effectively inhibiting microbial contamination of the security filter and ensuring the quality of the reverse osmosis feed water. The system employs a method of medium-pressure ultraviolet sterilization followed by the addition of a reducing agent, replacing traditional non-oxidizing bactericides, ensuring sterilization while reducing the amount of reducing agent required.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a method and system for treating reverse osmosis microbial contamination. Background Technology

[0002] As the "lifeblood" of thermal power units, the safety of water supply throughout the plant is of paramount importance. Reverse osmosis, a commonly used water treatment technology, is widely applied in the power industry. However, many power plants currently suffer from varying degrees of microbial fouling of their reverse osmosis membranes. On the one hand, this leads to problems such as decreased system desalination rates, increased permeate pressure, and frequent membrane cleaning, seriously threatening the safety of water supply throughout the plant. On the other hand, it also shortens the lifespan of reverse osmosis membranes and security filter cartridges, increasing operating costs. The main reason for frequent membrane microbial fouling is that microorganisms multiply rapidly and can regenerate, easily forming biological slime on the surface of membranes and security filter cartridges, which is difficult to remove completely. In addition, organic matter can also easily become nutrients for microbial growth.

[0003] To prevent microbial contamination of the reverse osmosis system, power plants typically add bactericides. Adding sodium hypochlorite before ultrafiltration effectively prevents microbial contamination of the ultrafiltration system. However, sodium hypochlorite is a strong oxidant and can cause irreversible oxidative damage to the reverse osmosis membrane, reducing its lifespan. Therefore, a reducing agent needs to be added before reverse osmosis to remove residual oxidizing chlorine from the water, along with a non-oxidizing bactericide. Non-oxidizing bactericides are expensive, have complex compositions, easily pollute water, and their bactericidal effect is far less than that of oxidizing bactericides. Reverse osmosis security filters are used to prevent large particulate impurities from entering the reverse osmosis system and clogging the membrane. Security filters typically use a one-piece stainless steel cylindrical design with a filtration accuracy of 5µm. When the pressure differential increases, reverse osmosis must be shut down, and the filter element must be removed and replaced, which cannot meet the requirements for continuous reverse osmosis operation. Adding a reducing agent before the security filter prevents oxidizing bactericides from effectively killing the impurities. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned reverse osmosis microbial contamination treatment methods, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a method for treating reverse osmosis microbial contamination.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for treating reverse osmosis microbial contamination, comprising...

[0007] At least two filters should be installed in parallel;

[0008] The filter is controlled to switch between oxidative sterilization and reduction states, while the filter's operating information is monitored.

[0009] Determine whether the filter element needs to be replaced based on the work information.

[0010] As a preferred embodiment of the reverse osmosis microbial contamination treatment method of the present invention, the fluid is subjected to medium-pressure ultraviolet sterilization before entering the filter; and a reducing agent is added to the fluid after medium-pressure ultraviolet sterilization.

[0011] As a preferred embodiment of the reverse osmosis microbial contamination treatment method of the present invention, the set value range of the operating pressure difference is 0.10 to 0.15 MPa, and the working information is the operating pressure difference of the filter; the operating pressure difference is the difference between the fluid pressure at the inlet end of the filter and the fluid pressure at the outlet end. When the operating pressure difference is greater than the set value, it indicates that the filter element needs to be isolated and replaced.

[0012] This invention also proposes a reverse osmosis microbial contamination treatment system, employing the aforementioned reverse osmosis microbial contamination treatment method; it includes,

[0013] The filtration unit includes at least two filters;

[0014] The water delivery unit includes a first water delivery module and a second water delivery module, and the first water delivery module and the second water delivery module are connected to each filter;

[0015] The water outlet unit includes a first water outlet module for conveying filtered liquid, a second water outlet module for discharging waste liquid, and a third water outlet module connected to the second water supply module. The first water outlet module, the second water outlet module, and the third water outlet module are all connected to each filter.

[0016] The second water delivery module is equipped with a first pressure gauge, and the first water outlet module is equipped with a second pressure gauge;

[0017] The second water delivery module is connected to a reducing agent addition module;

[0018] By controlling different water supply modules and different water outlet modules, the filter in the filtration unit can switch between oxidation sterilization and reduction states.

[0019] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, it further includes a water inlet pipe, which is connected to the first water delivery module and the second water delivery module.

[0020] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, the first water delivery module includes a first water delivery trunk line and at least two first water delivery branch lines connected to the first water delivery trunk line.

[0021] A first valve is installed on the first water supply main line, and the number of the first water supply branches is equal to the number of filters and is connected to each filter. A valve is installed on each of the first water supply branches.

[0022] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, the second water delivery module includes a second water delivery main line and at least two second water delivery branch lines connected to the second water delivery main line.

[0023] A fourth valve is installed on the second water supply main line. The number of the second water supply branches is equal to the number of filters and they are connected to each filter. Each of the second water supply branches is equipped with a valve.

[0024] The reducing agent addition module is located on the second water supply main.

[0025] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, the first water outlet module includes a first water outlet branch line that is equivalent in number to the number of filters and is connected to each other, and a first water outlet main line that is connected to the first water outlet branch line.

[0026] The first pressure gauge is installed on the second water supply main line, and the second pressure gauge is installed on the first water outlet main line.

[0027] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, the third effluent module includes a third effluent branch line that is equivalent in number to the number of filters and is connected to each other, and a third effluent main line that is connected to the third effluent branch line.

[0028] The third water outlet main line is connected to the second water supply main line.

[0029] As a preferred embodiment of the reverse osmosis microbial contamination treatment system of the present invention, a first online residual chlorine meter is installed on the second water supply main line, and a second online residual chlorine meter is installed on the second water outlet module.

[0030] The beneficial effects of this invention are as follows: Compared with the prior art, the reverse osmosis microbial contamination treatment system and method proposed in this invention include a security filter comprising two independent filter membrane housings, enabling continuous operation of the reverse osmosis equipment; the reverse osmosis feed water containing oxidizing chlorine passes through one of the security filter membrane housings, placing it in an oxidizing and sterilizing state, eliminating the need for additional chemical addition, effectively inhibiting microbial contamination of the security filter, and ensuring the quality of the reverse osmosis feed water; the method of adding a reducing agent after medium-pressure ultraviolet sterilization replaces the traditional non-oxidizing bactericide, ensuring sterilization while reducing the amount of reducing agent required. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0032] Figure 1 This is a structural diagram of each unit in the reverse osmosis microbial contamination treatment system of the present invention.

[0033] Figure 2 This is a structural diagram of each module in the reverse osmosis microbial contamination treatment system of the present invention.

[0034] Figure 3 This is a detailed structural diagram of the reverse osmosis microbial contamination treatment system of the present invention.

[0035] Figure 4 This is a flow diagram of the fluid direction during the oxidation and sterilization process of the first security filter in this invention.

[0036] Figure 5 This is a diagram showing the fluid flow direction during the flushing process of the first security filter in this invention.

[0037] Figure 6 This is a flow diagram of the fluid direction during the oxidation and sterilization process of the second security filter in this invention. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0041] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0042] Example 1 provides a method for treating reverse osmosis microbial contamination, including...

[0043] S1. At least two filters should be installed in parallel;

[0044] In application, the inlet water can selectively enter the interior of any of the filters. In this embodiment, there are two filters, and the inlet water can enter the interior of each of the two filters respectively.

[0045] S2. Control the filter to switch between oxidation sterilization and reduction states;

[0046] Under normal conditions, one filter is kept in an oxidizing and sterilizing state, while the other is kept in a reducing state. The incoming water first enters the inside of the filter in the oxidizing and sterilizing state. After the fluid passes through this filter, a reducing agent is added, and then it is transported to the inside of the filter in the reducing state.

[0047] Every 24 to 36 hours, the filter in the oxidation sterilization state is switched to the reduction state, and the filter in the reduction state is switched to the oxidation sterilization state. In this way, both membrane housings can be oxidized and sterilized without stopping the machine, thus preventing the growth of microorganisms.

[0048] S3. Simultaneously monitor the filter's operating information; determine whether the filter element needs to be replaced based on the operating information.

[0049] The operating information is the operating pressure difference of the filter; the operating pressure difference is the difference between the fluid pressure at the filter inlet and the fluid pressure at the filter outlet. When the operating pressure difference is greater than the set value, it indicates that the filter element needs to be isolated and replaced. The set value range of the operating pressure difference is 0.10 to 0.15 MPa.

[0050] Before the fluid enters the filter, it undergoes medium-pressure ultraviolet sterilization. After medium-pressure ultraviolet sterilization, a reducing agent is added to the fluid. This method of adding a reducing agent after medium-pressure ultraviolet sterilization replaces the traditional non-oxidizing sterilizer, ensuring sterilization while reducing the amount of reducing agent required.

[0051] Example 2, refer to Figures 1 to 6 This embodiment differs from the first embodiment in that it also proposes a reverse osmosis microbial contamination treatment system, employing the aforementioned reverse osmosis microbial contamination treatment method; it includes a filtration unit 100, comprising at least two filters; as shown... Figure 2 In this embodiment, the filtering unit 100 includes two security filters, namely a first security filter 101 and a second security filter 102.

[0052] The reverse osmosis microbial contamination treatment system includes a water delivery unit 200, which includes a first water delivery module 201 and a second water delivery module 202. The first water delivery module 201 and the second water delivery module 202 are connected to each filter. The first water delivery module 201 and the second water delivery module 202 can deliver water to the first security filter 101 and the second security filter 102, respectively.

[0053] The reverse osmosis microbial contamination treatment system includes an outlet unit 300, comprising a first outlet module 301 for conveying filtered liquid, a second outlet module 302 for discharging waste liquid, and a third outlet module 303 connected to a second water supply module 202. Each filter is connected to the first outlet module 301, the second outlet module 302, and the third outlet module 303. The second water supply module 202 is equipped with a first pressure gauge 700, and the first outlet module 301 is equipped with a second pressure gauge 800. The second water supply module 202 is connected to a reducing agent addition module 400. By controlling different water supply modules and different outlet modules, the filters in the filtration unit 100 are controlled to switch between oxidation sterilization and reduction states. Every 24-36 hours, the filter in the oxidation sterilization state switches to the reduction state, and the filter in the reduction state switches to the oxidation sterilization state. This ensures that both membrane housings are oxidized and sterilized without shutting down the system, preventing microbial growth.

[0054] The first water outlet module 301 is used to transport the treated water to the subsequent water supply pipeline, the third water outlet module 303 is used to build a circulation channel in the system, and the second water outlet module 302 can discharge wastewater.

[0055] Specifically, it also includes a water inlet pipe 900, which is connected to the first water delivery module 201 and the second water delivery module 202, such as... Figure 2 The water inlet pipe 900 is equipped with an inlet valve 901 and a medium-pressure ultraviolet sterilization device 902. The inlet valve 901 is used to transport water to the system, while the medium-pressure ultraviolet sterilization device 902 can sterilize the water.

[0056] Furthermore, the first water delivery module 201 includes a first water delivery main line 201a and at least two first water delivery branch lines 201b connected to the first water delivery main line 201a; a first valve 201c is provided on the first water delivery main line 201a, the number of first water delivery branch lines 201b is equivalent to the number of filters and is connected to each filter, and each first water delivery branch line 201b is provided with a valve.

[0057] like Figure 3There are two first water supply branches 201b, and each first water supply branch 201b is equipped with a valve. A second valve 201d is installed on the first water supply branch 201b connected to the first security filter 101, and a third valve 201e is installed on the first water supply branch 201b connected to the second security filter 102.

[0058] Furthermore, the second water delivery module 202 includes a second water delivery main line 202a and at least two second water delivery branch lines 202b connected to the second water delivery main line 202a; a fourth valve 202c is installed on the second water delivery main line 202a; the number of second water delivery branch lines 202b is equivalent to the number of filters and is connected to each filter; each second water delivery branch line 202b is equipped with a valve; the reducing agent addition module 400 is installed on the second water delivery main line 202a, wherein a fifth valve 202d is installed on the second water delivery branch line 202b connected to the first security filter 101, and a sixth valve 202e is installed on the second water delivery branch line 202b connected to the second security filter 102.

[0059] Furthermore, the first water outlet module 301 includes a first water outlet branch line 301a, which is connected to the number of filters one by one, and a first water outlet main line 301b connected to the first water outlet branch line 301a; a first pressure gauge 700 is installed on the second water supply main line 202a, and a second pressure gauge 800 is installed on the first water outlet main line 301b. An eighth valve 301c is installed on the first water outlet branch line 301a connected to the first security filter 101, and an eleventh valve 301d is installed on the first water outlet branch line 301a connected to the second security filter 102.

[0060] Furthermore, the third water outlet module 303 includes a third water outlet branch line 303a, which is connected to the number of filters one by one, and a third water outlet main line 303b connected to the third water outlet branch line 303a; the third water outlet main line 303b is connected to the second water supply main line 202a.

[0061] The third water outlet branch line 303a connected to the first security filter 101 is equipped with a seventh valve 303c, and the third water outlet branch line 303a connected to the second security filter 102 is equipped with a tenth valve 303d. In addition, the second water outlet module 302 also includes two second water outlet branches 302a connected to the first security filter 101 and the second security filter 102 respectively. The second water outlet branch line 302a connected to the first security filter 101 is equipped with a ninth valve 302b, and the second water outlet branch line 302a connected to the second security filter 102 is equipped with a twelfth valve 302c.

[0062] Furthermore, a first online residual chlorine meter 500 is installed on the second water supply main line 202a, a second online residual chlorine meter 600 is installed on the second water outlet module 302, an online ORP meter 202g is also installed on the second water supply main line 202a, and a pipeline mixer 202f is also installed on the second water supply main line 202a after the reducing agent addition module 400. All valves are electric valves.

[0063] Under normal operating conditions: Two sets of security filters operate simultaneously. One set maintains an oxidizing and sterilizing state for filtration, while the other set maintains a reducing state for pre-reverse osmosis filtration. Taking the first security filter 101 in an oxidizing and sterilizing state and the second security filter in a reducing state as an example, the system keeps the first valve 201c, the second valve 201d, the sixth valve 202e, the seventh valve 303c, and the eleventh valve 301d open, and the third valve 201e, the fourth valve 202c, the fifth valve 202d, the eighth valve 301c, the ninth valve 302b, the tenth valve 303d, and the twelfth valve 302c closed. For example... Figure 4 The water inlet process is as follows: water inlet pipe 900 → medium-pressure ultraviolet sterilization device 902 → first valve 201c → second valve 201d → first security filter 101 → seventh valve 303c → fourth valve 202c followed by adding reducing agent → pipeline mixer 202f → first online residual chlorine meter 500 → online ORP meter 202g → first pressure gauge 700 → sixth valve 202e → second security filter 102 → eleventh valve 301d → second pressure gauge 800 → first water outlet module 301.

[0064] After medium-pressure ultraviolet sterilization, a reducing agent is added to the incoming water pipe 900. The amount of reducing agent added is automatically adjusted based on the measurement data from the first online residual chlorine meter 500 and the online ORP meter 202g to ensure that the relevant measured indicators meet the water quality requirements of the incoming water pipe 900. The water is then thoroughly mixed by the pipe mixer 202f. The difference between the first pressure gauge 700 and the second pressure gauge 800 is the operating pressure differential of the security filter. When the pressure differential reaches 0.10–0.15 MPa or higher, the filter must be isolated online and replaced.

[0065] Switching process: The system will periodically switch between the two security filters, every 24-36 hours, to ensure that both membrane housings are oxidized and sterilized, preventing microbial growth. Taking the switching of the second security filter 102 to the oxidation and sterilization state as an example, it needs to be isolated online first. Based on the above steps, open the fourth valve 202c, the fifth valve 202d, and the ninth valve 302b, and close the first valve 201c and the second valve 201d.

[0066] like Figure 5The water inlet process is as follows: Inlet water pipe 900 → Medium-pressure ultraviolet sterilization device 902 → Fourth valve 202c → Add reducing agent → Pipeline mixer 202f → First online residual chlorine meter 500 → Online ORP meter 202g → First pressure gauge 700, then splits into two paths; one path is the fifth valve 202d → First security filter 101 → Ninth valve 302b → Second online residual chlorine meter 600 → Drainage; the other path is the sixth valve 202e → Second security filter 102 → Eleventh valve 301d → Second pressure gauge 800 → First outlet water module 301. First security filter 101 is flushed first. When the reading of the second online residual chlorine meter 600 is less than 0.05mg / L, the flushing is considered qualified.

[0067] At this point, open valve 301c (eighth valve) and close valve 302b (ninth valve), allowing water from the first security filter 101 to enter the first outlet module 301. Then close valves 202e (sixth valve) and 301d (eleventh valve), completing the online isolation and exit of the second security filter 102. The first security filter 101 now operates independently. If the differential pressure of the second security filter 102 does not exceed the control range, switch it to oxidation and sterilization mode by opening valves 201c (first valve), 201e (third valve), and 303d (tenth valve), and closing valve 202c, thus completing the switch. Figure 6 The water inlet process is as follows: water inlet pipe 900 → medium-pressure ultraviolet sterilization device 902 → first valve 201c → third valve 201e → second security filter 102 → tenth valve 303d → fourth valve 202c followed by adding reducing agent → pipeline mixer 202f → first online residual chlorine meter 500 → online ORP meter 202g → first pressure gauge 700 → fifth valve 202d → first security filter 101 → eighth valve 301c → second pressure gauge 800 → first water outlet module 301.

[0068] Compared with traditional methods, it can achieve continuous operation of reverse osmosis equipment. By periodically switching the online oxidation and sterilization state, it can effectively treat the microbial contamination of the security filter without adding additional agents. The medium-pressure ultraviolet sterilization is followed by the addition of a reducing agent. The medium-pressure ultraviolet sterilization device 902 inactivates microorganisms in the water while decomposing some residual chlorine and organic matter, reducing the TOC content in the water. The reduction of residual chlorine also helps to reduce the amount of reducing agent to be added.

[0069] The rest of the structure is the same as in Example 1.

[0070] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0071] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0072] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A reverse osmosis microbial contamination management method, characterized by: The application relates to a filter system and a method for treating reverse osmosis microbial pollution. At least two parallel filters are arranged; The filter is switched between oxidation sterilization and reduction, and the working information of the filter is monitored; Whether the filter element needs to be replaced is judged according to the working information; The reverse osmosis microbial pollution treatment method is applied to a reverse osmosis microbial pollution treatment system, and the reverse osmosis microbial pollution treatment method comprises the following steps: A filter unit (100) comprises at least two filters; A water feeding unit (200) comprises a first water feeding module (201) and a second water feeding module (202), and the first water feeding module (201) and the second water feeding module (202) are connected with each filter; A water outlet unit (300) comprises a first water outlet module (301) for feeding filtered liquid, a second water outlet module (302) for discharging waste liquid, and a third water outlet module (303) connected with the second water feeding module (202), and the first water outlet module (301), the second water outlet module (302) and the third water outlet module (303) are connected with each filter; The second water feeding module (202) is provided with a first pressure gauge (700), and the first water outlet module (301) is provided with a second pressure gauge (800); The second water feeding module (202) is connected with a reducing agent adding module (400); The filter in the filter unit (100) is switched between oxidation sterilization and reduction by controlling different water feeding modules and different water outlet modules.

2. The reverse osmosis microorganism fouling mitigation method of claim 1, wherein: The fluid is subjected to medium-pressure ultraviolet sterilization before entering the filter; The reducing agent is added into the fluid after the fluid is subjected to medium-pressure ultraviolet sterilization.

3. The reverse osmosis microorganism fouling mitigation method of claim 2, wherein: The working information is the running differential pressure of the filter; The running differential pressure is the difference between the fluid pressure at the inlet end and the fluid pressure at the outlet end of the filter, and when the running differential pressure is greater than a set value, it indicates that the filter element needs to be replaced; The set value range of the running differential pressure is 0.10-0.15 MPa.

4. The reverse osmosis microorganism fouling mitigation method of claim 3, wherein: The water inlet pipeline (900) is connected with the first water feeding module (201) and the second water feeding module (202).

5. The reverse osmosis microorganism fouling mitigation method of claim 4, wherein: The first water feeding module (201) comprises a first water feeding main line (201a) and at least two first water feeding branch lines (201b) connected with the first water feeding main line (201a); The first water feeding main line (201a) is provided with a first valve (201c), the number of the first water feeding branch lines (201b) is equal to that of the filters, and each first water feeding branch line (201b) is provided with a valve.

6. The reverse osmosis microorganism fouling mitigation method of claim 5, wherein: The second water feeding module (202) comprises a second water feeding main line (202a) and at least two second water feeding branch lines (202b) connected with the second water feeding main line (202a); The second water feeding main line (202a) is provided with a fourth valve (202c), the number of the second water feeding branch lines (202b) is equal to that of the filters, and each second water feeding branch line (202b) is provided with a valve; The reducing agent adding module (400) is arranged on the second water feeding main line (202a).

7. The reverse osmosis microorganism biofouling mitigation method of claim 6, wherein: The first water outlet module (301) comprises a first water outlet branch (301a) corresponding to the number of filters and connected one by one, and a first water outlet trunk (301b) connected with the first water outlet branch (301a); The first pressure gauge (700) is arranged on the second water supply trunk (202a), and the second pressure gauge (800) is arranged on the first water outlet trunk (301b).

8. The reverse osmosis microorganism biofouling mitigation method of claim 7, wherein: The third water outlet module (303) comprises a third water outlet branch (303a) corresponding to the number of filters and connected one by one, and a third water outlet trunk (303b) connected with the third water outlet branch (303a); The third water outlet trunk (303b) is connected with the second water supply trunk (202a).

9. The reverse osmosis microorganism biofouling mitigation method of claim 8, wherein: The second water supply trunk (202a) is provided with a first online residual chlorine gauge (500), and the second water outlet module (302) is provided with a second online residual chlorine gauge (600).

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