Reverse osmosis membrane group device

Abstract

The utility model relates to the technical field of water treatment, in particular to a reverse osmosis membrane group device which comprises a monitored reverse osmosis membrane group and a monitoring unit connected with the monitored reverse osmosis membrane group in parallel, the monitoring unit comprises a monitoring reverse osmosis membrane group; the capacity of the monitoring reverse osmosis membrane group is smaller than that of the monitored reverse osmosis membrane group. According to the reverse osmosis membrane group device provided by the utility model, the operation of the monitored reverse osmosis membrane group is effectively simulated on line in real time by introducing the monitoring units connected in parallel, and the monitoring reverse osmosis membrane group with smaller capacity and smaller pollutant holding capacity is further selected, so that the monitoring reverse osmosis membrane group is more quickly polluted and blocked than the monitored reverse osmosis membrane group; therefore, effective early warning of pollution and blockage of the monitored reverse osmosis membrane group is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially relates to a reverse osmosis membrane group device. BACKGROUND

[0002] Reverse osmosis membrane is often used for the preparation of pure water, in recent years, due to the requirement of industrial water reuse rate gradually increases, zero discharge project accelerates landing, more and more reverse osmosis system is used for wastewater reuse, thereby reducing the concentrated brine amount into the evaporator. In such a scenario, the working condition of reverse osmosis membrane system is getting worse, the pretreatment is often not designed and the operation is not normal, which leads to the inevitable pollution of reverse osmosis membrane.

[0003] During the working process of reverse osmosis membrane group, with the use of reverse osmosis membrane group, the pollution condition will gradually intensify, and when accumulated to a certain extent, it is necessary to stop the reverse osmosis membrane group offline chemical cleaning. The current large-scale membrane group has high cost and large volume, which leads to the need for the system to be in a shutdown state for a long time, which seriously affects the operation efficiency of the reverse osmosis membrane group.

[0004] Therefore, how to realize the early warning of the pollution of the reverse osmosis membrane group becomes a technical problem to be solved. UTILITY MODEL CONTENTS

[0005] In order to realize the early warning of the pollution of the reverse osmosis membrane group, the utility model provides a reverse osmosis membrane group, which realizes the early warning of the pollution of the monitored membrane group by setting the monitoring membrane group parallel to the monitored membrane group to simulate the operation of the monitored membrane group in real time.

[0006] The technical scheme adopted by the utility model to solve its technical problems is:

[0007] A reverse osmosis membrane group device, comprising a monitored reverse osmosis membrane group, and a monitoring unit parallelly arranged with the monitored reverse osmosis membrane group.

[0008] The monitoring unit comprises a monitoring reverse osmosis membrane group.

[0009] The capacity of the monitoring reverse osmosis membrane group is smaller than that of the monitored reverse osmosis membrane group.

[0010] Optionally, the monitored reverse osmosis membrane group comprises a first reverse osmosis membrane element, and the monitoring reverse osmosis membrane group comprises a second reverse osmosis membrane element; the second reverse osmosis membrane element has the same grid and membrane material as the first reverse osmosis membrane element.

[0011] Optionally, the monitoring reverse osmosis membrane group is connected with a differential pressure meter at both ends.

[0012] Optionally, the monitoring unit comprises a water inlet pipeline connected to the upstream of the monitored reverse osmosis membrane group; and a pressure pump and a water inlet flow meter are arranged on the water inlet pipeline.

[0013] Optionally, the monitoring unit further comprises a wastewater pipeline connected to the downstream of the monitored reverse osmosis membrane group; and an adjusting valve and a wastewater flow meter are arranged on the wastewater pipeline.

[0014] Optionally, a first conductivity meter is arranged on the wastewater pipeline; a second conductivity meter is arranged on the wastewater pipeline of the monitored reverse osmosis membrane group; and the detection values of the first conductivity meter and the second conductivity meter are consistent.

[0015] Optionally, the monitoring unit further comprises a water production pipeline connected to the downstream of the monitored reverse osmosis membrane group, and a water production flow meter is arranged on the water production pipeline.

[0016] Optionally, the monitoring unit further comprises a standby monitored reverse osmosis membrane group arranged in parallel with the monitored reverse osmosis membrane group.

[0017] Optionally, the monitoring unit further comprises a cleaning unit arranged in series with the monitored reverse osmosis membrane group and the monitored reverse osmosis membrane group.

[0018] Optionally, the cleaning unit comprises a cleaning agent storage tank, a cleaning pump connected to the upstream of the monitored reverse osmosis membrane group and the standby monitored reverse osmosis membrane group, and a cleaning intermediate storage tank connected to the downstream of the monitored reverse osmosis membrane group and the standby monitored reverse osmosis membrane group.

[0019] The beneficial effects of the present application are as follows:

[0020] The reverse osmosis membrane group device provided by the present application realizes real-time online effective simulation of the operation of the monitored reverse osmosis membrane group by introducing a parallel monitoring unit, and further realizes effective early warning of the pollution of the monitored reverse osmosis membrane group by selecting a monitored reverse osmosis membrane group with smaller capacity and smaller pollution capacity, so that the monitored reverse osmosis membrane group appears to be more polluted than the monitored reverse osmosis membrane group. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in combination with the drawings and examples.

[0022] Figure 1 is a structure diagram of the reverse osmosis membrane group device in the present application Figure 1 ;

[0023] Figure 2 is a structure diagram of the reverse osmosis membrane group device in the present application Figure 2 ;

[0024] Figure 3 is a structure diagram of the reverse osmosis membrane group device in the present applicationFigure 3 ;

[0025] Figure 4 is Figure 2 The figure is a comparison chart of the change of the pressure difference of the monitored reverse osmosis membrane group and the monitored reverse osmosis membrane group in the second embodiment of the present application;

[0026] Figure 5 is Figure 3 The figure is a comparison chart of the change of the membrane flux of the monitored reverse osmosis membrane group before and after cleaning in the second embodiment of the present application.

[0027] In the figure: 1-monitored reverse osmosis membrane group; 11-second conductivity meter; 2-monitoring unit; 21-monitored reverse osmosis membrane group; 22-differential pressure gauge; 23-water inlet pipeline; 231-pressure pump; 232-water inlet flow meter; 233-buffer tank; 234-water inlet pump; 235-drain valve; 24-waste water pipeline; 241-regulating valve; 242-waste water flow meter; 243-first conductivity meter; 244-waste water storage device; 25-produced water pipeline; 251-produced water flow meter; 252-produced water storage device; 26-back-up monitored reverse osmosis membrane group; 27-cleaning unit; 271-cleaning agent storage tank; 272-cleaning pump; 273-cleaning intermediate storage tank; 3-original water storage device. DETAILED DESCRIPTION

[0028] The present application will now be further described in detail. The embodiments described below are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments of the present application, belong to the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "first", "second" are only used to simplify the description, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0030] In the utility model, unless another definite provision and limitation, first feature is in first feature " on " or " under " second feature, can include first feature and second feature direct contact, also can include first feature and second feature is not direct contact but is through their between another feature contact.

[0031] In order to realize the prewarning of the pollution of the reverse osmosis membrane group, the utility model provides a kind of reverse osmosis membrane group device, refer to Figure 1 As shown, the reverse osmosis module device includes the reverse osmosis membrane group 1 to be monitored, and the monitoring unit 2 in parallel with the reverse osmosis membrane group 1 to be monitored;Wherein the reverse osmosis membrane group 1 to be monitored is the reverse osmosis membrane group for treating raw water, and its specific selection is determined according to use demand;Monitoring unit 2 is used to monitor the operation of the reverse osmosis membrane group 1 to be monitored, and the monitoring unit 2 includes monitoring reverse osmosis membrane group 21;In order to realize the prewarning of the pollution of the reverse osmosis membrane group, i.e. the reverse osmosis membrane group 1 to be monitored, the capacity of the monitoring reverse osmosis membrane group 21 is preferably less than the capacity of the reverse osmosis membrane group 1 to be monitored;For example, the common scale of the reverse osmosis membrane group 1 to be monitored is 100 tons / hour, or more membrane groups are in parallel to work to obtain more large processing capacity.And monitoring reverse osmosis membrane group 21 can select small capacity reverse osmosis membrane element, such as 1812 specification, 5 gallons of water per hour, connect such simulator to the water inlet of the on-site reverse osmosis system, and run in parallel with the actual membrane group.

[0032] Specifically, refer to Figure 1As shown, the monitoring unit 2 and the monitored reverse osmosis membrane group 1 are connected in parallel in the utility model, that is, the monitoring unit 2 and the monitored reverse osmosis membrane group 1 are the same in water inlet, and the two are directly connected with the raw water storage device 3 through the parallel pipeline to ensure that the water quality, the pollutant type, the pollution type and the working condition of the monitoring unit 2 and the monitored reverse osmosis membrane group 1 are consistent, so that the operation of the monitored reverse osmosis membrane group 1 is simulated in real time through the monitoring reverse osmosis membrane group 21 in the monitoring unit 2, and the same microbial pollution as the monitored reverse osmosis membrane group 1 can be formed in the long-term continuous operation, so that the pollution of the monitored reverse osmosis membrane group 1 can be simulated more effectively; because the capacity of the monitoring reverse osmosis membrane group 21 is smaller than that of the monitored reverse osmosis membrane group 1 in the utility model, therefore, the pollution capacity of the monitoring reverse osmosis membrane group 21 is smaller than that of the monitored reverse osmosis membrane group 1, so that the pollution speed of the monitoring reverse osmosis membrane group 21 is faster than that of the monitored reverse osmosis membrane group 1 in the actual continuous operation, so that the pollution of the monitored reverse osmosis membrane group 1 can be prewarned according to the pollution of the monitoring reverse osmosis membrane group 21, so that protective measures can be taken in advance for the monitored reverse osmosis membrane group 1.

[0033] The reverse osmosis membrane group device provided by the utility model realizes the effective simulation of the operation of the monitored reverse osmosis membrane group 1 in real time on line through the introduction of the parallel monitoring unit 2, and further selects the monitoring reverse osmosis membrane group 21 with smaller capacity and smaller pollution capacity, so that the monitoring reverse osmosis membrane group 21 appears pollution faster than the monitored reverse osmosis membrane group 1, thereby realizing the effective prewarning of the pollution of the monitored reverse osmosis membrane group 1.

[0034] The monitored reverse osmosis membrane group 1 comprises a reverse osmosis membrane element, which is referred to as a first reverse osmosis membrane element; the monitoring reverse osmosis membrane group 21 also comprises a reverse osmosis membrane element, which is referred to as a second reverse osmosis membrane element; in order to more accurately simulate the pollution of the monitored reverse osmosis membrane group 1, the utility model preferably selects the second reverse osmosis membrane element and the first reverse osmosis membrane element to have the same grid and membrane material, thereby realizing the same cross-flow filtration and grid pollution of the monitored reverse osmosis membrane group 1.

[0035] The utility model preferably selects the monitoring unit 2 to comprise a differential pressure meter 22, and further preferably connects the differential pressure meter 22 to the two ends of the monitoring reverse osmosis membrane group 21, so as to monitor the pressure at the two ends of the monitoring reverse osmosis membrane group 21 through the differential pressure meter 22, thereby being able to take protective measures earlier when the measured value of the differential pressure meter 22 is monitored to rise, and further improving the prewarning effect.

[0036] In order to realize real-time monitoring and early warning of the monitored reverse osmosis membrane group 1, the utility model preferably comprises the water inlet pipeline 23 connected to the upstream of the monitoring reverse osmosis membrane group 21, the water inlet end of the water inlet pipeline 23 is connected with the raw water storage device 3, and the raw water to be treated is transported to the monitoring unit 2 through the water inlet pipeline 23; the water inlet pipeline 23 is provided with the pressure pump 231 and the water inlet flowmeter 232, so that the water source is obtained from the raw water storage device 3, the adjustable water inlet pressure is generated by the pressure pump 231, and the water inlet flow is monitored by the water inlet flowmeter 4.

[0037] The monitoring unit 2 also comprises the wastewater pipeline 24 connected to the downstream of the monitoring reverse osmosis membrane group 21, so that the wastewater generated by the monitoring reverse osmosis membrane group 21 is transported to the wastewater storage device 244 through the wastewater pipeline 24; the wastewater pipeline 24 is provided with the adjusting valve 241 and the wastewater flowmeter 242, so that the wastewater production of the monitoring reverse osmosis membrane group 21 is adjusted through the adjusting valve 241, and the flow of the wastewater is monitored through the wastewater flowmeter 242.

[0038] During the operation of the monitoring unit 2, the control pressure and the drainage are consistent with the field. The pressure pump 231 and the adjusting valve 241 can be automatically adjusted, so that the operating conditions of the monitoring reverse osmosis membrane group 21, such as water production rate and recovery rate, are similar to those of the monitored reverse osmosis membrane group 1.

[0039] Further, referring to Fig. 1, Figure 2 The wastewater pipeline 24 is provided with the conductivity instrument, which is marked as the first conductivity instrument 243; at the same time, the wastewater pipeline of the monitored reverse osmosis membrane group 1 is provided with the first conductivity instrument 243 for monitoring the conductivity of the wastewater; the detection values of the first conductivity instrument 243 and the second conductivity instrument 11 are kept consistent through the measures such as adjusting the flow of the water inlet pipeline 23, so that the monitoring reverse osmosis membrane group can better simulate the pollution condition of the monitored reverse osmosis membrane group 1, and the accuracy of the pollution early warning is improved.

[0040] Further, the wastewater generated by the monitoring reverse osmosis membrane group 21 is transported to the water inlet of the monitoring reverse osmosis membrane group 21, so that the reuse of the wastewater generated by the monitoring unit 2 is realized, and at the same time, the water sample flowing through the monitoring unit 2 is concentrated, which not only retains the same pollution condition of organic matter and microorganism as the monitored reverse osmosis membrane group 1, but also causes the crystallization condition of inorganic ion concentration, that is, the pollution condition of the monitored reverse osmosis membrane group 1 can be effectively simulated, and the pollution condition can be further predicted in advance.

[0041] The utility model can realize the reuse of the wastewater in the following mode, referring to Fig. 1, Figure 2As shown, preferably, the water inlet pipeline 23 is provided with a buffer tank 233, the buffer tank 233 is arranged upstream of the pressure pump 231, and preferably, a water inlet pump 234 is arranged upstream of the buffer tank 233, and the wastewater pipeline 24 is connected with the buffer tank 233, so that in the working process, the wastewater generated by the monitoring reverse osmosis membrane group 21 can be reused after being mixed with the raw water again, and the water inlet amount of the water inlet pump 234 can be adjusted according to the detection result of the first conductivity instrument 243 and the first conductivity instrument 243, so that the detection values of the first conductivity instrument 243 and the first conductivity instrument 243 are kept consistent.

[0042] As shown, preferably, the water inlet pipeline 23 is provided with a buffer tank 233, the buffer tank 233 is arranged upstream of the pressure pump 231, and preferably, a water inlet pump 234 is arranged upstream of the buffer tank 233, and the wastewater pipeline 24 is connected with the buffer tank 233, so that in the working process, the wastewater generated by the monitoring reverse osmosis membrane group 21 can be reused after being mixed with the raw water again, and the water inlet amount of the water inlet pump 234 can be adjusted according to the detection result of the first conductivity instrument 243 and the first conductivity instrument 243, so that the detection values of the first conductivity instrument 243 and the first conductivity instrument 243 are kept consistent.

[0043] The monitoring unit 2 in the utility model further includes water production pipeline 25 connected downstream of monitoring reverse osmosis membrane group 21, in order to collect the water handled in the monitoring process, specifically, the water production pipeline 25 is connected with water production storage device 252, and the water production pipeline 25 is provided with water production flow meter 251, in order to monitor water production.

[0044] In addition, the existing large-scale membrane group is high in cost and large in size, and when fouling occurs, online cleaning is usually tried first to avoid taking out the membrane element from the membrane shell. However, due to the unknown fouling reason, such online cleaning is often blind. After various cleaning methods are tried and found ineffective, the membrane shell has to be opened, the membrane element group is taken out for analysis, and then offline cleaning is carried out. This also causes further extension of the system downtime.

[0045] The reverse osmosis membrane group device provided by the utility model has the advantages that the monitoring reverse osmosis membrane group 21 has the same fouling type as the monitored reverse osmosis membrane group 1, is low in cost, small in size, convenient to disassemble and assemble, and can confirm the type of membrane fouling, so that the user can try different cleaning methods for recovery, determine the optimal cleaning method, and complete the cleaning of the monitored reverse osmosis membrane group 1 while minimizing the downtime.

[0046] For the convenience of understanding, the structure shown in the drawings will be taken as an example to describe the reverse osmosis membrane group device. Figure 2

[0047] ​In industrial scenarios, it is often necessary to connect more than six reverse osmosis membrane elements in series to achieve a recovery rate of 75%. In the present embodiment, the monitored reverse osmosis membrane group 1 is connected by six reverse osmosis membrane elements in series; the monitoring reverse osmosis membrane group 21 uses only one reverse osmosis membrane element; and the working process makes the first conductivity meter 243 consistent with the conductivity detected by the second conductivity meter 11.

[0048] Figure 4 The data of the pressure difference measured at the two ends of the monitoring reverse osmosis membrane group 21 under different recovery rate controls are compared with the actual pressure difference of the monitored reverse osmosis membrane group 1. Among them, 1 is the pressure difference change of the monitoring reverse osmosis membrane group 21 under high recovery rate (the recovery rate is 85%), 2 is the pressure difference change of the monitored reverse osmosis membrane group 1 over time under low recovery rate (the recovery rate is 40%), and 3, 4 and 5 are the pressure changes of the monitoring reverse osmosis membrane group 21 under low, medium and high recovery rates (the recovery rates are 50%, 60% and 70%, respectively). It can be seen that under the same recovery rate conditions, the fouling of the monitoring reverse osmosis membrane group 21 and the monitored reverse osmosis membrane group 1 has the same trend, and the fouling progresses faster than the monitored reverse osmosis membrane group 1, and an early warning can be given before serious fouling occurs.

[0049] In order to realize the continuous monitoring of the monitored reverse osmosis membrane group 1, referring to Figure 3 As shown in the figure, in another embodiment of the present application, the preferred monitoring unit 2 further comprises a standby monitoring reverse osmosis membrane group 26 connected in parallel with the monitoring reverse osmosis membrane group 21. The standby monitoring reverse osmosis membrane group 26 has the same structure as the monitoring reverse osmosis membrane group 21, so that the monitoring and cleaning can be carried out by switching the monitoring reverse osmosis membrane group 21 and the standby monitoring reverse osmosis membrane group 26, and the continuity of the monitoring is ensured.

[0050] Further, in order to reduce the number and time of shutdown cleaning, more accurately judge the type of fouling, and select a better fouling cleaning method, the present application preferably comprises a cleaning unit 27 connected in series with the monitoring reverse osmosis membrane group 21 and the standby monitoring reverse osmosis membrane group 26, so as to clean the fouling monitoring reverse osmosis membrane group 21 or the standby monitoring reverse osmosis membrane group 26 by the cleaning unit 27, and the effectiveness of different cleaning agents can be tested during the cleaning process, thereby providing a basis for cleaning the monitored reverse osmosis membrane group 1.

[0051] Specifically, the present application preferably comprises a cleaning agent storage tank 271 connected to the upstream of the monitoring reverse osmosis membrane group 21 and the standby monitoring reverse osmosis membrane group 26, a cleaning pump 272, and a cleaning intermediate storage tank 273 connected to the downstream of the monitoring reverse osmosis membrane group 21 and the standby monitoring reverse osmosis membrane group 26.

[0052] By setting up the standby monitoring reverse osmosis membrane group 26 and the cleaning unit 2, the monitoring reverse osmosis membrane group 21 and the standby monitoring reverse osmosis membrane group 26 can be respectively in the monitoring and cleaning state. In this way, the equipment can continuously monitor and simultaneously perform online cleaning on the contaminated membrane to prepare for the next monitoring.

[0053] In actual production application, the reverse osmosis membrane manufacturer has very detailed requirements for the water inlet. In addition to various water qualities, the SDI membrane pollution index is often used for evaluation. The corresponding working principle is described as follows:

[0054] Disposable test membranes are added to the membrane cassette, the membrane cassette is locked, and the water inlet of the reverse osmosis module is connected. The water inlet valve is adjusted so that the water pressure is stable, and the water is continuously supplied for 15 minutes. The ratio of the flow rate at the beginning of water supply to the flow rate at the end of water supply is defined as SDI. Generally, the SDI value should be less than 3 to enter the membrane system.

[0055] However, this test process is still different from the actual pollution situation.

[0056] First, SDI is in a dead-end filtration mode, and all measured water samples will be filtered through the membrane. The reverse osmosis is a spiral membrane structure, which is a cross-flow filtration state, and only a small part of the water will pass through the reverse osmosis membrane to become pure water, and the rest of the water sample will carry pollutants together. This also makes the SDI method unable to effectively simulate the actual operation of the reverse osmosis system. The membrane used in the SDI analysis is completely different from the membrane material and screen structure used in the reverse osmosis system, and cannot simulate the sharp decline in flow caused by screen pollution.

[0057] Second, the SDI method is a short-term method, which generally takes about 20 minutes, which can simulate the pollution caused by colloids and suspended particles in the water body. However, in addition to the above two reasons, more dissolved organic matter and microorganism breeding are caused in the existing reverse osmosis system. In such a short time, the SDI method cannot measure the pollution caused by these two factors.

[0058] Third, the SDI method does not concentrate the water body, and the dissolution state of inorganic ions in the water does not change dramatically during the test process. In the actual reverse osmosis system, the overall recovery rate is usually set to about 75%, which means that the ion concentration in the water will increase by 4 times. Often due to poor control, some easily scaled ions form crystals and precipitate on the membrane surface, causing pollution.

[0059] Fourth, SDI is a manual method, which is difficult to meet the requirements of frequent testing in scenes with large water quality fluctuations.

[0060] Compared with the commonly used SDI membrane pollution index evaluation method, the reverse osmosis membrane group device can more accurately simulate the actual water treatment process, so that the pollution and blockage of the monitored reverse osmosis membrane group can be warned earlier and more accurately.

[0061] To describe the process of monitoring and cleaning alternately, the structure shown in Figure 3 The reverse osmosis membrane group device is described by taking the structure shown in the figure as an example.

[0062] Referring to Figure 5 As shown in the figure, the figure shows that after the monitoring reverse osmosis membrane group 21 experiences a serious pollution, the membrane flux decreases by 50%. Switch to the cleaning state, and perform 1 hour of online cleaning. Water is found to be limited again. The standard flux only increases by 18%. It is indicated that the cleaning agent used this time cannot well restore the membrane, and different cleaning agents and cleaning schemes need to be tried. In the above cleaning process, the standby monitoring reverse osmosis membrane group 22 continues to monitor, thereby ensuring the continuity of the monitoring.

[0063] With the above ideal embodiment according to the utility model as the inspiration, through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A reverse osmosis membrane module apparatus, characterized by, The monitoring unit (2) is connected to the upstream of the monitored reverse osmosis membrane group (1) in parallel. The monitoring unit (2) comprises a monitored reverse osmosis membrane group (21). The capacity of the monitored reverse osmosis membrane group (21) is smaller than that of the monitored reverse osmosis membrane group (1).

2. The reverse osmosis membrane module assembly of claim 1, wherein, The monitored reverse osmosis membrane group (1) comprises first reverse osmosis membrane elements, and the monitored reverse osmosis membrane group (21) comprises second reverse osmosis membrane elements.

3. The reverse osmosis membrane module assembly of claim 1, wherein the membrane module assembly is configured to be positioned in a reverse osmosis system. Both ends of the monitored reverse osmosis membrane group (21) are connected with a differential pressure meter (22).

4. The reverse osmosis membrane module assembly of claim 1, wherein, The monitoring unit (2) comprises a water inlet pipeline (23) connected to the upstream of the monitored reverse osmosis membrane group (21); the water inlet pipeline (23) is provided with a pressure pump (231) and a water inlet flow meter (232).

5. The reverse osmosis membrane module assembly of claim 4, wherein the membrane module assembly is configured to be installed in a reverse osmosis system. The monitoring unit (2) further comprises a wastewater pipeline (24) connected to the downstream of the monitored reverse osmosis membrane group (21); the wastewater pipeline (24) is provided with an adjusting valve (241) and a wastewater flow meter (242).

6. The reverse osmosis membrane module assembly of claim 5, wherein the membrane module assembly is configured to be installed in a reverse osmosis system. The wastewater pipeline (24) is provided with a first conductivity meter (243); the wastewater pipeline of the monitored reverse osmosis membrane group (1) is provided with a second conductivity meter (11); the detection values of the first conductivity meter (243) and the second conductivity meter (11) are consistent.

7. The reverse osmosis membrane module assembly of claim 5, wherein the membrane module assembly is configured to be installed in a reverse osmosis system. The monitoring unit (2) further comprises a water production pipeline (25) connected to the downstream of the monitored reverse osmosis membrane group (21), and the water production pipeline (25) is provided with a water production flow meter (251).

8. The reverse osmosis membrane module assembly of any one of claims 1-7, wherein, The monitoring unit (2) further comprises a standby monitored reverse osmosis membrane group (26) connected to the monitored reverse osmosis membrane group (21) in parallel.

9. The reverse osmosis membrane module assembly of claim 8, wherein, The monitoring unit (2) further comprises a cleaning unit (27) connected to the monitored reverse osmosis membrane group (21) and the standby monitored reverse osmosis membrane group (26) in series.

10. The reverse osmosis membrane module assembly of claim 9, wherein the membrane module assembly is configured to be installed in a reverse osmosis system. The cleaning unit (27) comprises a cleaning agent storage tank (271) and a cleaning pump (272) connected to the upstream of the monitored reverse osmosis membrane group (21) and the standby monitored reverse osmosis membrane group (26), and a cleaning intermediate storage tank (273) connected to the downstream of the monitored reverse osmosis membrane group (21) and the standby monitored reverse osmosis membrane group (26).

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