A cross-flow reverse osmosis membrane fouling experimental simulation device

Abstract

This utility model relates to the field of water purification technology, and discloses a cross-flow reverse osmosis membrane fouling experimental simulation device, including a membrane pack 12 for cross-flow filtration of raw water. The membrane pack 12 includes multi-layer reverse osmosis membrane sheets that can be quickly assembled and disassembled, and is clamped and erected on a base 18 by membrane pack pressure plates set on the left and right sides. A first branch for controlling the raw water feed is provided on the lower side of one side of the membrane pack 12, and a second branch for controlling the discharge is provided on the upper side of this side. The second branch also includes a reflux component for controlling the return of the concentrate that has not passed through the membrane to the raw water storage container. The membrane pack of this utility model adopts a pressure plate modular design, which facilitates the quick replacement of membrane sheets of different models and materials. Through pressure regulation, flow rate adjustment and reagent addition, the membrane fouling and reagent intervention process under actual working conditions can be accurately simulated under laboratory conditions. It is suitable for the study of cross-flow reverse osmosis membrane fouling mechanism and reagent screening under multiple conditions and multiple variables.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a cross-flow reverse osmosis membrane fouling experimental simulation device. Background Technology

[0002] Currently, reverse osmosis membrane treatment technology has been widely used in various reclaimed water processes in my country. Reverse osmosis membranes and ultrafiltration membranes, as core separation components, are indispensable in water treatment and purification processes. However, all types of reverse osmosis and ultrafiltration membranes generally face the technical challenges of membrane fouling and clogging, mainly manifested as decreased permeate flow, reduced desalination rate, and increased membrane cleaning and replacement frequency. These problems directly lead to increased operating costs and reduced operating efficiency, severely restricting the widespread adoption and stable application of membrane technology. Current simulation experiments on membrane fouling and clogging are mostly large-scale pilot-scale systems, which are costly and complex to operate, making it inconvenient to quickly conduct multi-condition parameter comparison studies under laboratory conditions. Therefore, there is an urgent need for a cross-flow filtration device with a simple structure, easy construction, and continuous operation to accurately simulate membrane fouling phenomena and conduct screening experiments for optimal antiscalant or antibacterial agent.

[0003] Existing technology 1:

[0004] A Chinese patent with publication number CN221085231U discloses a column-type microfiltration membrane performance testing device, including a testing water tank and an inlet pipe. The bottom of the testing water tank is provided with a delivery pipe connected to the inlet pipe. An installation mechanism is installed on the right side of the inlet pipe. The installation mechanism includes a detachable pipe and a membrane shell. A product water pipe is connected to the upper left corner of the membrane shell, and a concentrate pipe is connected to the bottom of the membrane shell. The end of the concentrate pipe extends to the inside of the testing water tank. A cleaning mechanism is connected to the lower left corner of the membrane shell. The cleaning mechanism includes a cleaning pipe and a cleaning column.

[0005] The shortcomings of the existing technology are as follows:

[0006] Limited experimental scale and simulation conditions: This device is mainly used for small-scale microfiltration membrane performance testing and cannot simulate high-flux, continuous cross-flow operation and circulation systems, thus providing limited support for dynamic research on membrane fouling and reagent action processes.

[0007] Parameter control is not precise enough: The device has limited pressure and flow regulation capabilities, making it difficult to accurately reproduce various operating parameters in engineered reverse osmosis systems, and the dynamic simulation methods are relatively limited. Membrane module replacement is inconvenient / adaptability is weak: The main structure is mostly a customized column cavity, making it cumbersome to change membrane materials or specifications, and making it difficult to achieve high-flux, rapid comparison of various membrane materials.

[0008] Lack of reflux circulation design: The device structure is a single-path design of inlet water-membrane-outlet water, without a reflux port, which cannot realize cross-flow filtration and concentrate reflux circulation, making it difficult to simulate the working conditions of cross-flow reverse osmosis membranes in actual reclaimed water plants.

[0009] Limited applicability of experimental data: Due to structural and functional limitations, the experimental data obtained by this device has limited reference value for process optimization in actual large-scale membrane fouling, scale inhibitor screening, and other processes. Summary of the Invention

[0010] To overcome or alleviate one or more of the above-mentioned technical problems, the purpose of this utility model is to provide a cross-flow reverse osmosis membrane fouling experimental simulation device. This device employs multi-layered membrane packs and uses pressure plates to achieve rapid replacement and sealing of the membrane packs. Equipped with pressure gauges and multi-way controllable valves, it allows for precise control of feed flow rate, permeate pressure, permeate flow, and reflux flow, enabling efficient simulation of membrane fouling under actual operating conditions and the effects of different reagents. Simultaneously, the device includes a reflux end, allowing some of the unpermeated liquid to circulate back to the feed tank, ensuring closed-loop liquid circulation and continuous experimentation.

[0011] This utility model provides the following technical solution:

[0012] A cross-flow reverse osmosis membrane fouling experimental simulation device includes a membrane pack (12) for cross-flow filtration of raw water. The membrane pack (12) includes multi-layer reverse osmosis membrane sheets that can be quickly disassembled and assembled. The membrane pack is clamped and erected on a base (18) by membrane pack pressure plates arranged on the left and right sides. A first branch for controlling the feed of raw water is provided on the lower side of one side of the membrane pack (12), and a second branch for controlling the discharge is provided on the upper side of the same side. The second branch includes a reflux component for controlling the return of the concentrate that has not passed through the membrane to the raw water storage container.

[0013] According to some implementations, the first branch includes, in sequence, a feed end (13) for entering raw water, a first manual diaphragm valve (5) and a three-way interface (16), wherein the three-way interface (16) is connected to the inlet at the lower end of the membrane pack (12); the third interface of the three-way interface (16) is provided with a pre-membrane pressure gauge (9);

[0014] The second branch includes, in sequence, another three-way interface (16) for connecting the upper outlet side of the membrane pack (12), another first manual diaphragm valve (5) and a permeate end (6), and the third interface of the three-way interface (16) of the second branch is provided with a post-membrane pressure gauge (4);

[0015] The second branch reflux assembly includes a reflux end (8) located on the water outlet side of the upper end of the membrane pack (12) and controlled to open and close by a second manual diaphragm valve (3). Reflux liquid that does not pass through the membrane pack (12) flows out through the reflux end (8) and returns to the raw water storage container.

[0016] According to some implementations, the interfaces of the three-way interface (16) are all provided with silicone gaskets (2) and clamps (10) for sealing.

[0017] According to some embodiments, the membrane pack (12) is fixed on the fixed bracket (14) by the support rod fixing nut (1) and bolt support column (7), and the fixed bracket (14) passes through the two membrane pack pressure plates and clamps them from left to right; the membrane pack pressure plate on one side is vertically fixed to the base (18) by the fixing bolt (19).

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention features a reflux port, forming a closed-loop circulation with the feed tank. Combined with a cross-flow filtration design, it not only supports continuous long-term operation, enabling continuous circulation of raw water within the system, but also effectively simulates the dynamic accumulation of membrane fouling and the action of chemicals in actual engineering processes, meeting the needs of high-flux and dynamic research experiments. Through concentrate reflux circulation and cross-flow filtration design, it achieves high-flux simulation, continuous cross-flow operation, and a circulating system, dynamically simulating process conditions and supporting systematic research on dynamic membrane fouling and chemical effects.

[0020] This invention is equipped with a pressure gauge and multiple valves, enabling real-time and flexible control of key parameters such as feed flow rate, membrane pressure, permeate flow, and return flow. It allows for rapid switching and accurate reproduction of multiple experimental conditions, better approximating the diverse operating parameters of actual reverse osmosis systems. It supports fine-tuning of core parameters such as flow rate and pressure, rapidly reproducing various process conditions with precise parameter control and strong adaptability to experimental conditions.

[0021] This invention adopts a modular membrane packaging design, which supports the stacking and installation of multiple membranes of different materials and specifications. It can achieve simple and quick replacement, improve experimental efficiency and high-throughput multivariate comparative testing capabilities, and ensure the switching of multi-level research and development and application scenarios.

[0022] This invention features a reflux port, separating the product water and reflux ends. The reflux liquid is directly returned to the raw water tank, achieving concentrate reflux and cross-flow filtration, accurately simulating actual reverse osmosis membrane operating conditions. The reflux circulation design realizes cross-flow filtration under true engineering conditions. This design can realistically reproduce the cross-flow and circulation effects in actual membrane treatment processes, facilitating in-depth research on membrane fouling, scale inhibition, and sterilization processes, and enhancing the authenticity of experimental data and its engineering guidance value.

[0023] This invention features multi-parameter controllability and continuous dynamic operation, enabling parallel simulation under multiple conditions. The experimental data obtained has good repeatability and representativeness, and can truly reflect the development law of membrane fouling and the effect of reagents in large-scale systems. The experimental data has strong reference value and is more valuable for engineering promotion. It provides direct and usable data support for scientific research and engineering, and effectively fills the problem of insufficient applicability of data from small column devices. Attached Figure Description

[0024] Figure 1 A schematic diagram of the cross-flow reverse osmosis membrane fouling experimental simulation device provided in this embodiment of the utility model.

[0025] In the picture:

[0026] 1-Support rod fixing nut; 2-Silicone gasket; 3-Second manual diaphragm valve; 4-Pressure gauge after membrane passage; 5-First manual diaphragm valve; 6-Permeate end; 7-Bolt support column; 8-Return end; 9-Pressure gauge before membrane passage; 10-Clamp; 11-Left membrane wrapping pressure plate; 12-Membrane wrap; 13-Feed end; 14-Fixed bracket; 15-Base support leg; 16-T-connector; 17-Right membrane wrapping pressure plate; 18-Base; 19-Fixing bolt. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are for illustrative purposes only and do not constitute any limitation on the scope of protection of the present invention. All reasonable modifications and combinations that fall within the inventive spirit of the present invention are within the scope of protection of the present invention.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figure 1 The structure of the cross-flow reverse osmosis membrane fouling experimental simulation device provided in this embodiment is described as follows: A base 18 is provided at the bottom, and a vertically arranged filter assembly is fixed on the base 18. A first branch for feed is provided below one side of the filter assembly, and a second branch for discharge is provided above it. The second branch is also used to return the concentrate that has not passed through the membrane to the raw water return assembly. A return end 8 is provided at the connection between the filter assembly and the second branch. Specifically:

[0032] First branch: Raw water enters from the feed end 13 through a hose or pipe. The feed end 13 is sealed to the pipeline and serves as the raw water inlet of the device. The feed end 13 is connected to the three-way interface 16 via a manual diaphragm valve 5. The pressure test before the membrane is performed through the three-way interface 16 and the water is filtered into the membrane package 12.

[0033] Membrane Pack 12: Raw water enters membrane pack 12 from the lower end of the three-way connector 16. Membrane pack 12 is the core filtration component, containing multiple layers of stacked filtration membranes, with fluid flowing through the membrane layers in a cross-flow manner from bottom to top. Membrane pack 12 features a modular, quick-assembly and disassembly structure, allowing for rapid replacement of membrane sheets of different specifications or materials according to experimental needs, and supports the stacking of multiple membrane layers.

[0034] The structure of the fixed support for membrane package 12 is as follows:

[0035] The membrane pack 12 is clamped and fixed by the left membrane pack pressure plate 11 and the right membrane pack pressure plate 17, and uniform pressure is applied to ensure stable stress and sealing of the filter membrane. The membrane pack 12 has adapter interfaces at both ends for easy installation, removal, and replacement of the membrane material. It is fixed by the support rod fixing nut 1 and bolt support column 7. The fixing bracket 14 passes through the two pressure plates and is clamped securely. One of the pressure plates is fastened to the base 18 by the fixing bolt 19 passing through the base 18. The bottom of the base 18 is supported by the base support legs 15.

[0036] The second branch: After cross-flow filtration within membrane pack 12, the raw water has two outlets at the top. The first outlet is the permeate end 6, connected to a three-way connector 16 and the first manual diaphragm valve 5. The filtered permeate flows out from this end and is guided by a hose to a collection container or measuring cylinder. The second outlet is a return end 8 located on the outlet side of membrane pack 12, controlled by a second manual diaphragm valve 3. Return liquid that has not passed through the membrane flows out from this end and returns to the raw water tank via a hose, achieving test solution circulation. The water that has passed through the membrane after cross-flow filtration is the permeate outlet. Some of the raw water that has not passed through the membrane gradually concentrates and is collected again at the return end 8 and discharged back into the raw water tank. The third connector of the three-way connector 16 in the second branch is connected to a pressure gauge 4 after passing through the membrane to monitor the pressure of the filtered permeate in real time.

[0037] In the second branch, the through end 6 and the return end 8 are respectively controlled by the first manual diaphragm valve 5 and the second manual diaphragm valve 3 of the second branch to open or shut off, thereby regulating the passage and flow rate. Each connection sealing part is equipped with a silicone gasket 2 to improve sealing and prevent leakage.

[0038] The pressure gauge 9 before membrane flow and the pressure gauge 4 after membrane flow are respectively installed in the inlet and outlet channels of the membrane pack 12, which can monitor the pressure on both sides of the membrane pack in real time.

[0039] Since only a portion of water molecules can pass through the membrane pack 12 each time, the remaining liquid that loses some water molecules flows back to the raw water tank from the return end, waiting for the next filtration. The entire filtration process is not a one-time membrane pass, but a continuous cycle. Each cycle causes the raw water in the raw water tank to lose some water molecules, making the raw water concentration increase. This cycle process is the common principle of all cross-flow filtration devices.

[0040] Fluid flow path description:

[0041] Raw water enters from the feed end 13, passes through the first manual diaphragm valve 5 of the first branch, then through the three-way interface 16, and flows into the membrane pack 12 (which is held and fixed by the left and right membrane pack pressure plates). It then flows vertically upwards through the inner filter membrane of the membrane pack 12 for cross-flow filtration. During this process, the pressure gauge 9 connected to the third interface of the three-way interface 16 of the first branch collects pressure values.

[0042] The filtered permeate flows out along the right side of the membrane package 12, through the three-way interface 16 of the second branch, through the first manual diaphragm valve 5, and out through the permeate end 6. The pressure value is collected by the pressure gauge 4 connected to the three-way interface 16 and controlled by the first manual diaphragm valve 5. The permeate flows into a collection container such as a measuring cylinder or collection bottle outside the permeate end 6.

[0043] Unfiltered liquid is output through return end 8 and its flow is controlled by the second manual diaphragm valve 3. The return hose leads to the raw water tank to achieve liquid circulation.

[0044] The system's operating status is monitored at each pressure point along the inlet, circulation, and product water paths using corresponding pressure gauges and pressure meters.

[0045] The cross-flow reverse osmosis membrane fouling and clogging experimental simulation device in this embodiment is equipped with the following experimental and auxiliary equipment to ensure overall experimental accuracy, controllability, and efficiency:

[0046] Feed tank (raw water tank): A beaker with magnetic stirring function is used to ensure that the raw water and the reagent are mixed evenly. The raw water liquid is connected to the peristaltic pump through a hose.

[0047] Peristaltic pump / constant flow pump: Enables quantitative and constant-speed delivery of the liquid used in the experiment into the feed end 13. The pressure and flow rate can be finely adjusted to accurately reproduce the actual engineering environment.

[0048] Pressure gauges: A pressure gauge 9 (before the membrane) and a pressure gauge 4 (after the membrane) are installed in the water channels before and after the membrane housing 12 to monitor pressure changes on both sides of the membrane housing in real time. All gauges are secured to the pipeline using clamps 10 to ensure a tight seal at the pressure monitoring points and facilitate easy replacement.

[0049] Gas cylinders and accessories: When draining water, air can be introduced from the feed end 13 or the return end 8. When testing for air tightness, air can be introduced from the feed end 13 to ensure the equipment is sealed and safe.

[0050] Collection equipment (measuring cylinder / collecting cup): used for collecting and measuring produced water, wastewater and experimental samples.

[0051] Connecting hoses and related valves: including manual diaphragm valves and silicone gaskets at various locations, to ensure unobstructed and sealed fluid paths.

[0052] In this embodiment, the flow rate and pressure can be precisely controlled. A peristaltic pump enables stepless adjustment of the flow rate within the range of 1–500 mL / min. The system ensures that the inlet and outlet water pressures are precisely within the range of 0–2 bar (typical reverse osmosis operating pressure range) through the second manual diaphragm valve 3, the first manual diaphragm valves 5 of the first and second branches, the pressure gauge 9 before membrane flow, and the pressure gauge 4 after membrane flow. Flexible dosing and mixing are achieved through a magnetic stirrer in conjunction with the dosing port, ensuring uniform dispersion of the reagents in the feed tank, thus achieving pretreatment before the experiment. Cross-flow ratio and rejection rate can be controlled by adjusting the flow rate and pressure at the permeate end 6 and the return end 8, setting different active cross-flow ratios to simulate different operating conditions (such as high speed, high cross-flow, high rejection rate, etc.). The membrane pack 12 is adjustable, supporting rapid replacement of various membrane layers, materials, and pore sizes to meet different experimental needs. Highly reliable airtightness monitoring is achieved through pressurized gas cylinders combined with graduated cylinder observation at the product water end, ensuring no gas leakage and avoiding experimental errors.

[0053] Specific experimental procedure:

[0054] ①System preparation and inspection

[0055] Assemble membrane pack 12 as needed, confirm that all connections are well sealed, and that the silicone gaskets are in place. Connect components such as feed end 13, return end 8 and permeate end 6, pre-membrane pressure gauge 9, post-membrane pressure gauge 4, first and second manual diaphragm valves, etc., according to specifications. Add deionized water to the feed tank and turn on the magnetic stirrer to ensure initial uniform mixing.

[0056] ② Wetting, drainage and airtightness tests

[0057] 1. Wetting: Connect all hoses. First, place the permeate end and return end hoses into the waste liquid cup, and introduce deionized water into the feed end hose. Start the peristaltic pump, control the pressure to 0.3 bar, open the return end 8 and close the permeate end 6 to allow water to flow out, then close the return end 8 and open the permeate end 6 to allow water to flow out. Wetting is now complete.

[0058] 2. Drainage: Use a gas cylinder to vent air to the feed end 13, which involves opening the return end 8 and closing the permeation end 6 to drain the water, then closing the return end 8 and opening the permeation end 6 to drain the water completely.

[0059] 3. Air tightness test: Disconnect the water pipe from the return end 8 and connect the gas cylinder to the return end 8. Close the through end 6 and blow water out of the device, then reverse the operation. Connect the gas cylinder to the feed end 13 and introduce air into the feed end 13. Adjust the air pressure to 1 bar. Invert the graduated cylinder filled with water into the water basin. Insert the hose connected to the through end 6 into the lower part of the graduated cylinder opening. Observe the change in gas volume in the pressure gauge and the water-immersed inverted graduated cylinder for one minute to test the air tightness (if the gas output in one minute is less than 12 ml, the seal meets the standard).

[0060] ③ Experimental run

[0061] The experimental water sample is prepared as needed and thoroughly stirred. Different concentrations of scale inhibitor / bactericide are added if necessary. The peristaltic pump at the feed end is turned on to pump the water sample into the device. The pressure and flow rate are monitored in real time by the pressure gauge 9 before membrane and the pressure gauge 4 after membrane. The peristaltic pump and the first and second manual diaphragm valves are adjusted as needed. Different reagent types, dosages, operating pressures, permeate / reflux ratios and other parameters are set according to the experimental plan. The device is run continuously and samples are collected.

[0062] ④ Sample collection, data recording and cleaning

[0063] Real-time recording of key data such as influent and effluent pressure, permeate flow, and reflux flow; collection of samples before, after, and in the reflux solution to analyze the composition of membrane contaminants and the effectiveness of reagents; after the experiment, the system is shut down in reverse order, the membrane pack is disassembled, and all components are thoroughly cleaned to prepare for the next experiment.

[0064] Example 2

[0065] This embodiment uses the cross-flow reverse osmosis membrane fouling simulation device provided in Embodiment 1 to conduct a screening experiment for scale inhibitors in urban wastewater reclaimed water.

[0066] I. Experimental Preparation

[0067] 1. Raw water sample: 5L of effluent from a municipal wastewater treatment plant (pretreated by sedimentation and disinfection) was prepared and divided into 3 groups according to experimental requirements, with each group containing 1.5L.

[0068] 2. Preparation of reagents: Prepare solutions of different concentrations (e.g., 100 mg / L and 200 mg / L) using commercially available scale inhibitors A and B.

[0069] 3. Feeding tank and stirring: Add raw water and corresponding reagent to a beaker equipped with a magnetic stirrer and stir thoroughly to ensure uniform dosage distribution;

[0070] 4. Membrane selection: Install the reverse osmosis membrane that has been used in the city's wastewater treatment plant for some time into the membrane pack 12, and clamp the left and right membrane pack pressure plates to ensure good sealing.

[0071] II. System Setup and Debugging

[0072] According to the procedure, connect the feed hose, reflux hose, and permeate hose to the beaker (raw water tank), reflux pipeline, and product water collection bottle, respectively; start the peristaltic pump, fill the system with deionized water, and perform preliminary wetting and airtightness testing to confirm that there is no leakage; adjust the system pressure to 3 bar, set the feed rate to 50 mL / min, and the reflux rate to 20 mL / min; after each group completes the above initialization, the experimental raw water is formally added in sequence.

[0073] III. Experimental Operation and Observation

[0074] Each system was controlled to run continuously for 2 hours under the above parameters. The pressure before and after the membrane and the permeate flow rate were recorded in real time. Permeate and reflux samples were collected. The pressure gauge readings and permeate flow rate were recorded every 30 minutes. Attention was paid to any significant decrease in flux and membrane fouling trend. After the experiment, the membrane pack was disassembled and the membrane surface was characterized by SEM or EDS to compare the types and distribution of membrane contaminants under different reagents and dosages.

[0075] IV. Data Analysis and Conclusions

[0076] The changes in permeate flux, pressure rise rate, and actual membrane fouling were statistically analyzed for each group under different reagent and concentration conditions. The results showed that scale inhibitor A at a concentration of 200 mg / L significantly inhibited the deposition of hard scale and organic pollutants, and the decrease in permeate flux was significantly lower than that of the control group (without scale inhibitor). This proves that the device of the present invention can efficiently and accurately reflect the membrane fouling and reagent action patterns. At the same time, the convenient membrane pack replacement and reflux circulation design significantly improves experimental efficiency and data reproducibility.

[0077] The above embodiments are merely preferred embodiments of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that improvements and modifications made by those skilled in the art without departing from the principle of this invention should also be considered within the protection scope of this utility model.

Claims

1. A cross-flow reverse osmosis membrane fouling experimental simulation device, characterized in that: The system includes a membrane pack (12) for cross-flow filtration of raw water. The membrane pack (12) includes a multi-layer reverse osmosis membrane that can be quickly disassembled and assembled. It is clamped and erected on the base (18) by membrane pack pressure plates arranged on the left and right sides. A first branch for controlling the feed of raw water is provided on the lower side of one side of the membrane pack (12), and a second branch for controlling the discharge is provided on the upper side of the same side. The second branch includes a reflux assembly for controlling the return of the concentrate that has not passed through the membrane to the raw water storage container.

2. The cross-flow reverse osmosis membrane fouling experimental simulation device according to claim 1, characterized in that: The first branch includes, in sequence, a feed end (13) for entering raw water, a first manual diaphragm valve (5) and a three-way interface (16), wherein the three-way interface (16) is connected to the inlet at the lower end of the membrane pack (12); the third interface of the three-way interface (16) is provided with a pre-membrane pressure gauge (9); The second branch includes, in sequence, another three-way interface (16) for connecting the upper outlet side of the membrane pack (12), another first manual diaphragm valve (5) and a permeate end (6), and the third interface of the three-way interface (16) of the second branch is provided with a post-membrane pressure gauge (4); The second branch reflux assembly includes a reflux end (8) located on the water outlet side of the upper end of the membrane pack (12) and controlled to open and close by a second manual diaphragm valve (3). Reflux liquid that does not pass through the membrane pack (12) flows out through the reflux end (8) and returns to the raw water storage container.

3. The cross-flow reverse osmosis membrane fouling experimental simulation device according to claim 2, characterized in that: The interfaces of the three-way connector (16) are all sealed with silicone gaskets (2) and clamps (10).

4. The cross-flow reverse osmosis membrane fouling experimental simulation device according to claim 3, characterized in that: The membrane pack (12) is fixed on the fixed bracket (14) by the support rod fixing nut (1) and bolt support column (7). The fixed bracket (14) passes through the two membrane pack pressure plates and clamps them from left to right. The membrane pack pressure plate on one side is vertically fixed to the base (18) by the fixing bolt (19).

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