Reverse osmosis membrane filtration system capable of backwashing

Abstract

The utility model relates to a reverse osmosis membrane filtration system capable of backwashing, which belongs to the technical field of reverse osmosis membrane cleaning and comprises a pump, a water outlet of the pump is connected with a water inlet of a reverse osmosis membrane component through a water inlet pipeline, and a water purification port of the reverse osmosis membrane component is connected with a water purification pipeline; a concentrated water port of the reverse osmosis membrane assembly is connected with a water inlet of the concentrated water pipeline; the filtering system further comprises a first flushing pipeline and a second flushing pipeline; two ends of the first flushing pipeline are respectively connected with a pump water outlet and a concentrated water port of the reverse osmosis membrane assembly; one end of the second flushing pipeline is connected with the water inlet pipeline between the first valve and the reverse osmosis membrane assembly, and the other end of the second flushing pipeline is connected to the concentrated water pipeline between the second valve and the concentrated water pipeline water outlet. By arranging the first flushing pipeline and the second flushing pipeline, the reverse osmosis membrane filtration system capable of realizing online reverse flushing is constructed, pollutants deposited on the surface of a membrane are effectively stripped, in-situ cleaning operation without disassembling a membrane component is realized, and the downtime of the system is remarkably shortened.

Description

Technical Field

[0001] This utility model belongs to the field of reverse osmosis membrane cleaning technology, specifically relating to a reverse osmosis membrane filtration system that can be backwashed. Background Technology

[0002] Reverse osmosis (RO) membrane filtration technology is a highly efficient water treatment method, widely used in seawater desalination, industrial wastewater reuse, and high-purity water preparation.

[0003] However, as the system operates for longer periods, reverse osmosis membrane modules face a series of technical bottlenecks. First, in traditional unidirectional reverse osmosis systems, suspended particles, colloids, organic matter, and microorganisms in the feed water are prone to form concentration polarization zones on the membrane surface and deposit, forming scale. Therefore, existing technologies require cleaning of the reverse osmosis membrane. The most common cleaning method is physical cleaning, which uses low-pressure water flow to backflush from the concentrate end to the feed end to remove contaminants from the membrane surface or uses high-velocity feed water to flush the membrane surface.

[0004] However, existing physical cleaning methods still have certain problems. Before cleaning, the reverse osmosis membrane usually needs to be disassembled. The disassembly process is complicated, and the downtime for a single operation is ≥2 hours, resulting in low cleaning efficiency of the reverse osmosis membrane. This leads to a reduction in the working time of the reverse osmosis membrane and a decrease in filtration efficiency, which is not conducive to automation and large-scale application. Utility Model Content

[0005] This invention addresses the problems in the prior art by providing a reverse osmosis membrane filtration system that can be backwashed, thus solving the problem of low cleaning efficiency caused by the complex disassembly process of physical cleaning methods in the prior art.

[0006] The technical solution adopted in this utility model is as follows:

[0007] This application provides a reverse osmosis membrane filtration system that can be backwashed, including a pump, the pump outlet being connected to the inlet of the reverse osmosis membrane module via an inlet pipe, and a first valve being provided on the inlet pipe;

[0008] The water inlet of the reverse osmosis membrane module is connected to the water purification pipe;

[0009] The concentrate outlet of the reverse osmosis membrane module is connected to the inlet of the concentrate pipeline, and a second valve is installed on the concentrate pipeline;

[0010] The filtration system also includes a first flushing pipe and a second flushing pipe;

[0011] The first flushing pipe is connected to the pump outlet and the concentrate outlet of the reverse osmosis membrane module at both ends, and a third valve is installed on the first flushing pipe.

[0012] One end of the second flushing pipe is connected to the inlet pipe between the first valve and the reverse osmosis membrane module, and the other end of the second flushing pipe is connected to the concentrate pipe between the second valve and the concentrate pipe drain outlet. A fourth valve is installed on the second flushing pipe.

[0013] Preferably, the first valve, the second valve, the third valve, and the fourth valve are all electrically controlled valves.

[0014] Preferably, the reverse osmosis membrane module includes a first water collection pipe, a second water collection pipe, a third water collection pipe, and a plurality of reverse osmosis membranes. The first water collection pipe is connected to the inlet water pipe and the inlet of each reverse osmosis membrane. The second water collection pipe is connected to the purified water pipe and the purified water outlet of each reverse osmosis membrane. The third water collection pipe is connected to the concentrate water pipe and the concentrate outlet of each reverse osmosis membrane.

[0015] Preferably, a switch valve is installed between the water outlet of each reverse osmosis membrane and the second water collection pipe.

[0016] Preferably, the system is also equipped with a circulation pipeline, one end of which is connected to the pump, and the other end of which is connected to the second flushing pipeline between the fourth valve and the concentrate pipeline. A circulation valve is installed on the circulation pipeline.

[0017] Preferably, a pressure sensor and a flow sensor are installed on the water inlet pipe.

[0018] Preferably, the water purification pipeline is equipped with a conductivity detection module and a flow meter.

[0019] Preferably, the concentrate pipeline is equipped with a pressure sensor, a conductivity detection module and a flow sensor.

[0020] Preferably, the conductivity detection module is a pipeline conductivity sensor.

[0021] Preferably, the pump is a booster pump.

[0022] As can be seen from the above technical solutions, this utility model has the following advantages:

[0023] 1. This invention constructs a reverse osmosis membrane filtration system that can realize online backwashing by setting up a first flushing pipe and a second flushing pipe. This allows the cleaning water to flow in reverse from the concentrate end to the feed end, effectively removing pollutants deposited on the membrane surface. This enables in-situ cleaning without disassembling the membrane module, significantly reducing system downtime, improving membrane lifespan and filtration efficiency, and meeting the needs of automated and large-scale operation.

[0024] By setting all valves to be electrically controlled, the efficiency of the flushing process is further improved, eliminating the need for time-consuming manual valve turning by staff.

[0025] 2. By setting up a water collection pipeline structure (inlet water, purified water, concentrate water) for the reverse osmosis membrane module, unified water supply and drainage of multiple membrane elements are realized, simplifying the system connection structure, which is conducive to unified pipe laying and convenient maintenance. At the same time, it is easy to control the area and expand the module modularly, enhancing the system flexibility and engineering adaptability.

[0026] A switch valve is installed between the clean water inlet and the water collection pipe of each membrane module, which can isolate the unit membrane module during cleaning or maintenance, avoiding the shutdown of the entire system due to contamination of individual components, and enhancing the system's maintainability and fault isolation capability.

[0027] 3. Installing pressure and flow sensors on the inlet pipe can monitor the operating status of the membrane module in real time, making it easier to determine the degree of membrane fouling and the timing of cleaning, achieving precise control and early warning, and helping to ensure the long-term stable operation of the system.

[0028] Installing a conductivity detection module and flow meter on the water purification pipeline can provide real-time feedback on the quality and quantity of produced water, facilitating quality control and operational optimization. Additionally, it allows for comparison of water quality recovery after cleaning, serving as a basis for membrane fouling or performance assessment.

[0029] By installing pressure sensors, conductivity modules, and flow sensors on the concentrate pipeline, the operating status of the membrane downstream can be monitored. Combined with data from the inlet end, membrane resistance changes can be analyzed to help determine whether membrane fouling, scaling, or concentration polarization occurs, thereby improving the system's intelligent diagnostic capabilities. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure in a specific embodiment of the present utility model.

[0032] In the diagram: 1. Booster pump; 2. Inlet pipe; 3. First valve; 4. Clean water pipe; 5. Concentrate pipe; 6. Second valve; 7. First flushing pipe; 8. Second flushing pipe; 9. Third valve; 10. Fourth valve; 11. First collection pipe; 12. Second collection pipe; 13. Third collection pipe; 14. Reverse osmosis membrane; 15. Switch valve; 16. Circulation pipe; 17. Circulation valve; 18. Pressure sensor; 19. Flow sensor; 20. Conductivity detection module; 21. Flow meter. Detailed Implementation

[0033] Various embodiments of this disclosure will be described more fully in the following detailed description. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0034] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0035] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of this disclosure, indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of this disclosure, the terms “comprising,” “having,” and their cognates are intended only to indicate a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of the foregoing.

[0036] In various embodiments of this disclosure, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0037] The terms used in the various embodiments of this disclosure (such as "first," "second," etc.) may modify various components in the various embodiments, but do not limit the corresponding components. For example, the above terms do not limit the order and / or importance of the components. The above terms are only used for the purpose of distinguishing one component from others. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, a first component may be referred to as a second component without departing from the scope of the various embodiments of this disclosure, and similarly, a second component may also be referred to as a first component.

[0038] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0039] 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.

[0040] Example:

[0041] like Figure 1 As shown, this embodiment provides a reverse osmosis membrane filtration system that can be backwashed, including a pump. The pump outlet is connected to the inlet of the reverse osmosis membrane module through an inlet pipe 2, and a first valve 3 is provided on the inlet pipe 2.

[0042] The water inlet of the reverse osmosis membrane module is connected to the water purification pipe 4;

[0043] The concentrate outlet of the reverse osmosis membrane module is connected to the inlet of the concentrate pipe 5, and a second valve 6 is installed on the concentrate pipe 5;

[0044] The filtration system also includes a first flushing pipe 7 and a second flushing pipe 8;

[0045] The first flushing pipe 7 is connected at both ends to the pump outlet and the concentrate outlet of the reverse osmosis membrane module, respectively. A third valve 9 is installed on the first flushing pipe 7.

[0046] One end of the second flushing pipe 8 is connected to the inlet pipe 2 between the first valve 3 and the reverse osmosis membrane module, and the other end of the second flushing pipe 8 is connected to the concentrate pipe 5 between the second valve 6 and the outlet of the concentrate pipe 5. A fourth valve 10 is provided on the second flushing pipe 8.

[0047] By setting up two independent flushing pipes, reverse water flow is achieved by pumping water into the membrane module through the concentrate end and discharging it from the inlet end, thereby stripping away deposits on the membrane surface and achieving online cleaning without disassembly.

[0048] In this embodiment, the pump is a booster pump 1.

[0049] In this embodiment, the first valve 3, the second valve 6, the third valve 9, and the fourth valve 10 are all electrically controlled valves.

[0050] Electric valves can be connected to PLCs or industrial controllers, and the flushing logic can be triggered by preset time or conditions such as increased membrane resistance to improve operating efficiency;

[0051] An electric ball valve with Modbus communication protocol is selected, with a control signal input response time of less than 1 second, and the valve position is monitored in real time through feedback signals.

[0052] In this embodiment, the reverse osmosis membrane assembly includes a first water collection pipe 11, a second water collection pipe 12, a third water collection pipe 13, and a plurality of reverse osmosis membranes 14. The first water collection pipe 11 is connected to the inlet pipe 2 and the inlet of each reverse osmosis membrane 14. The second water collection pipe 12 is connected to the purified water pipe 4 and the purified water outlet of each reverse osmosis membrane 14. The third water collection pipe 13 is connected to the concentrate pipe 5 and the concentrate outlet of each reverse osmosis membrane 14.

[0053] Taking three reverse osmosis membranes 14 as an example, the first, second and third water collection pipes 13 are all made of stainless steel with a diameter of 50mm, and the three-way joints are uniformly made of quick-installation clamps, which facilitates quick assembly and disassembly.

[0054] In this embodiment, a switch valve 15 is provided between the clean water inlet of each reverse osmosis membrane 14 and the second water collection pipe 12.

[0055] The switch valve 15 is a 316L stainless steel needle valve, installed between the clean water inlet of the membrane housing and the water collection pipe. It can be controlled manually or electrically. The switch valve 15 is uniformly numbered for easy management.

[0056] In this embodiment, the system is also provided with a circulation pipe 16. One end of the circulation pipe 16 is connected to the pump, and the other end of the circulation pipe 16 is connected to the second flushing pipe 8 between the fourth valve 10 and the concentrate pipe 5. A circulation valve 17 is provided on the circulation pipe 16.

[0057] In this embodiment, a pressure sensor 18 and a flow sensor 19 are installed on the water inlet pipe 2.

[0058] The pressure sensor 18 has a measurement range of 0-1.6 MPa; the flow sensor 19 uses an E+H electromagnetic flow meter 21 with a 420mA output for communication, and uploads data to the SCADA system monitoring interface in real time.

[0059] In this embodiment, a conductivity detection module 20 and a flow meter 21 are installed on the water purification pipe 4.

[0060] The conductivity module is a Yokogawa SC202G pipeline conductivity meter with a measurement range of 0.12000 μS / cm and automatic temperature compensation; the flow meter 21 is a turbine flow meter 21 with a range of 0.24 m³ / h.

[0061] In this embodiment, a pressure sensor 18, a conductivity detection module 20, and a flow sensor 19 are installed on the concentrate pipeline 5.

[0062] The conductivity module on the concentrate side is the same as that on the purified water side and is installed before the concentrate outlet; the pressure sensor 18 has a range of 0~1.0MPa, and the flow sensor 19 is an ultrasonic pipe section flow meter 21 with an accuracy of ±1%.

[0063] In this embodiment, the conductivity detection module 20 is a pipeline conductivity sensor.

[0064] It adopts the HACH CDC401 four-pole pipe sensor with a 1.5-inch threaded connection interface. The sensor material is 316L+PEEK, with an IP68 protection rating and digital output function.

[0065] The cleaning process is as follows: When cleaning the reverse osmosis membrane 14, firstly, open the first valve 3 and the second valve 6, close the third valve 9 and the fourth valve 10, and simultaneously close the switch valve 15. At this time, water flows from the booster pump 1 through the inlet pipe 2 into the reverse osmosis membrane module to perform forward flushing of the reverse osmosis membrane 14. The flushed water flows through the third collection pipe 13 into the concentrate pipe 5 for discharge, completing the forward flushing. After a certain period of time, close the first valve 3 and the second valve 6, and open the third valve 9 and the fourth valve 10. At this time, water flows from the booster pump 1 through the first flushing pipe 7 into the concentrate port of the reverse osmosis membrane module to perform reverse flushing of the reverse osmosis membrane 14. The flushed water flows through the inlet pipe 2 into the second flushing pipe 8, and then flows through the second flushing pipe 8 into the concentrate pipe 5 for discharge, completing the reverse flushing.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse osmosis membrane filtration system with backwashable capability, characterized in that, Includes a pump, the pump outlet is connected to the inlet of the reverse osmosis membrane module through an inlet pipe (2), and a first valve (3) is provided on the inlet pipe (2). The water inlet of the reverse osmosis membrane module is connected to the water purification pipe (4); The concentrate outlet of the reverse osmosis membrane module is connected to the inlet of the concentrate pipe (5), and a second valve (6) is installed on the concentrate pipe (5). The filtration system also includes a first flushing pipe (7) and a second flushing pipe (8); The first flushing pipe (7) is connected to the pump outlet and the concentrate outlet of the reverse osmosis membrane module at both ends, and a third valve (9) is installed on the first flushing pipe (7). One end of the second flushing pipe (8) is connected to the inlet pipe (2) between the first valve (3) and the reverse osmosis membrane module, and the other end of the second flushing pipe (8) is connected to the concentrated water pipe (5) between the second valve (6) and the drain outlet of the concentrated water pipe (5). A fourth valve (10) is provided on the second flushing pipe (8).

2. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, The first valve (3), the second valve (6), the third valve (9), and the fourth valve (10) are all electrically controlled valves.

3. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, The reverse osmosis membrane module includes a first water collection pipe (11), a second water collection pipe (12), a third water collection pipe (13), and several reverse osmosis membranes (14). The first water collection pipe (11) is connected to the inlet pipe (2) and the inlet of each reverse osmosis membrane (14). The second water collection pipe (12) is connected to the purified water pipe (4) and the purified water outlet of each reverse osmosis membrane (14). The third water collection pipe (13) is connected to the concentrate pipe (5) and the concentrate outlet of each reverse osmosis membrane (14).

4. The reverse osmosis membrane filtration system with backwashable capability according to claim 3, characterized in that, A switch valve (15) is installed between the clean water inlet of each reverse osmosis membrane (14) and the second water collection pipe (12).

5. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, The system is also equipped with a circulation pipe (16), one end of which is connected to the pump, and the other end of which is connected to the second flushing pipe (8) between the fourth valve (10) and the concentrated water pipe (5). A circulation valve (17) is installed on the circulation pipe (16).

6. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, A pressure sensor (18) and a flow sensor (19) are installed on the water inlet pipe (2).

7. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, A conductivity detection module (20) and a flow meter (21) are installed on the water purification pipe (4).

8. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, A pressure sensor (18), a conductivity detection module (20), and a flow sensor (19) are installed on the concentrate pipeline (5).

9. The reverse osmosis membrane filtration system with backwashable capability according to claim 7 or 8, characterized in that, The conductivity detection module (20) is a pipeline conductivity sensor.

10. The reverse osmosis membrane filtration system with backwashable capability according to claim 1, characterized in that, The pump is a booster pump (1).

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