An integrated testing device and testing method suitable for reverse osmosis membranes

Abstract

This invention belongs to the field of reverse osmosis membrane testing and discloses an integrated testing device and method suitable for reverse osmosis membranes. The device includes a control module, and a water collection module, a testing module, and a flushing module that cooperate with the control module. The control module further includes a controller, which is communicatively connected to various control valves, a product water conductivity meter, a product water electromagnetic flow meter, a feed water conductivity meter, and a feed water electromagnetic flow meter. It is used to control the opening of corresponding control valves based on user commands to perform testing and / or flushing processes, while simultaneously acquiring real-time data from the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter to calculate the system performance indicators corresponding to the target reverse osmosis membrane. This invention not only offers high testing efficiency but also helps to increase testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis membrane testing, and more specifically to an integrated testing device and method suitable for reverse osmosis membranes. Background Technology

[0002] Reverse osmosis membranes are artificial materials used to filter various impurities in water as needed, thereby meeting specific application needs in scenarios such as daily drinking, medical and pharmaceutical, industrial cleaning, and wastewater treatment.

[0003] To improve the filtration quality of reverse osmosis membranes, repeated research and testing are necessary to ensure their excellent filtration performance for target impurities. Specifically, during testing, a liquid containing the target impurities is passed through the reverse osmosis membrane to be optimized, and the content of the target impurities and the volume of water passing through the membrane are measured. Based on this, adjustments are made to the thickness, material, and density of each membrane layer in the membrane to be optimized. Furthermore, considering that impurities adhering to the membrane after each test can affect the accuracy of subsequent tests, the membrane must be thoroughly cleaned after each test.

[0004] However, the inventors discovered the following shortcomings in current reverse osmosis membrane research, testing, and subsequent cleaning processes, which hinder the effective improvement of overall testing accuracy and efficiency. First, the testing process requires parallel experiments on the same batch of reverse osmosis membranes. However, most existing testing devices can only support testing a single reverse osmosis membrane, leading to unavoidable objective and subjective errors in the consistency of experimental conditions when testing the same batch of membranes. This not only affects testing efficiency but also accuracy. Furthermore, current testing devices are often set up independently from cleaning devices, and both devices rely heavily on manual control during operation, further reducing overall testing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated testing device and method suitable for reverse osmosis membranes, so as to solve the technical problems of poor testing accuracy and low efficiency in existing reverse osmosis membrane testing.

[0006] To achieve the above objectives, the present invention proposes the following technical solution: Firstly, an integrated testing device suitable for reverse osmosis membranes is provided, comprising: The water collection module includes a concentrate collection chamber and a product water collection chamber; the inlet end of the product water collection chamber is equipped with a product water conductivity meter and a product water electromagnetic flow meter. The testing module includes several testing chambers, a saline testing tank, and several saline dosing tanks. The saline testing tank is connected to the saline dosing tank. The inlet side of any testing chamber is connected to the inlet of the concentrate collection chamber via a control valve, and the outlet side is connected to the inlet of the product water collection chamber via a control valve. The inlet of the saline testing tank is connected to the saline dosing tank via a control valve, and the outlet is connected to the inlet side of any testing chamber via a control valve. An inlet conductivity meter and an inlet electromagnetic flow meter are also installed between the outlet of the saline testing tank and the inlet side of any testing chamber. The rinsing module includes a clean water rinsing tank, an acid water rinsing tank, an alkaline water rinsing tank, an acid water dosing tank, and an alkaline water dosing tank; wherein the outlets of the clean water rinsing tank, the acid water rinsing tank, and the alkaline water rinsing tank are all connected to the inlet side of each test chamber via control valves; the acid water dosing tank is connected to the inlet of the acid water rinsing tank via a control valve, and the alkaline water dosing tank is connected to the inlet of the alkaline water rinsing tank via a control valve; The control module includes a controller, which is communicatively connected to all control valves, product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter. The controller is used to control the corresponding control valves to open or close according to the target opening degree based on user commands for testing and / or flushing processes. At the same time, it acquires data from the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter in real time to obtain the system performance indicators corresponding to the target reverse osmosis membrane.

[0007] Furthermore, including: The filtration module includes a Y-type filter and a security filter connected in sequence; the inlet of the Y-type filter is connected to the outlet of the salt water test tank, the clean water rinsing tank, the acid water rinsing tank and the alkaline water rinsing tank, and the outlet of the security filter is connected to the inlet of each test chamber.

[0008] Furthermore, including: The temperature control module includes a heat exchanger, a temperature control unit, and a temperature sensor; the temperature control unit is communicatively connected to the heat exchanger; the brine test chamber, clean water rinsing chamber, acid water rinsing chamber, and alkaline water rinsing chamber are connected to the water inlet side of each test chamber through the heat exchanger; the temperature sensor is used to measure the water inlet temperature of each test chamber. The controller is communicatively connected to the temperature control unit and is used to send temperature control commands to the temperature control unit to adjust the temperature of the heat exchanger; at the same time, the controller is communicatively connected to the temperature sensor to obtain the real-time inlet water temperature.

[0009] Furthermore, the testing module includes an inlet pH tester and an inlet ORP tester; both are placed between the saline test tank and the inlet side of any test chamber.

[0010] Furthermore, the test module includes an inlet pressure transmitter and an inlet pressure gauge; both are placed on the inlet side of any test chamber.

[0011] Furthermore, a clamping frame is placed inside any test chamber; the clamping frame is arranged along the body diagonal of the test chamber and is used to fix the target reverse osmosis membrane.

[0012] Furthermore, the saline dosing tank includes a first saline dosing tank and a second saline dosing tank; the first saline dosing tank contains a pre-prepared NaCl solution of the target concentration, and the second saline dosing tank contains a pre-prepared NaClO solution of the target concentration.

[0013] Secondly, an integrated testing method suitable for reverse osmosis membranes is provided, based on the aforementioned device, comprising: Several target reverse osmosis membranes were placed one by one in the test chamber, and pre-prepared saline, acidic and alkaline solutions were stored in the corresponding saline dosing tank, acidic dosing tank and alkaline dosing tank, respectively. The controller of the control module receives test instructions and controls the corresponding control valve to open and / or close at a preset opening degree, thereby realizing the testing of each target reverse osmosis membrane; wherein, the test instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level height of the brine test tank, the inlet water flow rate, and the inlet water duration; When the test is completed, the system performance parameters corresponding to each target reverse osmosis membrane are calculated by acquiring the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter. The controller of the control module obtains flushing instructions to execute the cleaning process; wherein, the flushing instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level height of the clean water flushing tank, the liquid level height of the acid water flushing tank, the liquid level height of the alkaline water flushing tank, the flushing sequence of various flushing solutions, and the flushing flow rate. The system acquires real-time data from each product water conductivity meter to determine when the rinsing process meets the preset effect and ends the cleaning process; it also sends an end prompt to the front end of the control module to prompt the removal of each target reverse osmosis membrane from its corresponding test chamber and end the integrated test.

[0014] Furthermore, the controller of the control module receives test commands and controls the corresponding control valve to open and / or close at a preset opening degree, thereby realizing the following steps before testing each target reverse osmosis membrane: The controller of the control module receives a pre-rinse command to execute the pre-cleaning process; wherein, the pre-rinse command includes the liquid level height of the clean water rinsing tank and the flow rate of the clean water; The pre-rinse process ends when the pre-rinse meets the preset pre-rinse effect by acquiring data from the conductivity tester of each product water in real time.

[0015] Furthermore, the controller of the control module receives test commands and controls the corresponding control valve to open and / or close at a preset opening degree, thereby realizing the testing of each target reverse osmosis membrane, including: The temperature control command is obtained and input into the temperature control unit to adjust the temperature gradient of the heat exchanger, thereby achieving temperature gradient adjustment of the test brine. Beneficial effects

[0016] As can be seen from the above technical solutions, the technical solution of the present invention provides an integrated testing device suitable for reverse osmosis membranes to solve the technical problems of poor testing accuracy and low efficiency in existing reverse osmosis membrane testing.

[0017] The device includes a water collection module, a testing module, a flushing module, and a control module that cooperate with each other. Specifically, the water collection module includes a concentrate collection chamber and a product water collection chamber; the inlet end of the product water collection chamber is equipped with a product water conductivity meter and a product water electromagnetic flow meter. The testing module includes several testing chambers, a brine testing tank, and several brine dosing tanks; the brine testing tank is connected to the brine dosing tank; wherein, the inlet side of any testing chamber is connected to the inlet end of the concentrate collection chamber through a control valve, and the outlet side is connected to the inlet end of the product water collection chamber through a control valve; the inlet end of the brine testing tank is connected to the brine dosing tank through a control valve, and the outlet end is connected to the inlet side of any testing chamber through a control valve; wherein, an inlet water conductivity meter and an inlet water electromagnetic flow meter are also installed between the outlet end of the brine testing tank and the inlet side of any testing chamber. The flushing module includes a clean water flushing tank, an acid water flushing tank, an alkaline water flushing tank, an acid water dosing tank, and an alkaline water dosing tank. The outlets of the clean water flushing tank, acid water flushing tank, and alkaline water flushing tank are all connected to the inlet of each test chamber via control valves. The acid water dosing tank is connected to the inlet of the acid water flushing tank via a control valve, and the alkaline water dosing tank is connected to the inlet of the alkaline water flushing tank via a control valve. The control module includes a controller, which is communicatively connected to all control valves, the product water conductivity meter, the product water electromagnetic flow meter, the inlet water conductivity meter, and the inlet water electromagnetic flow meter. The controller is used to control the corresponding control valves to open or close at a target opening degree based on user commands for testing and / or flushing processes. Simultaneously, it acquires data from the product water conductivity meter, the product water electromagnetic flow meter, the inlet water conductivity meter, and the inlet water electromagnetic flow meter in real time to obtain the system performance indicators corresponding to the target reverse osmosis membrane.

[0018] When multiple target reverse osmosis membranes need to be tested, they can be placed in their respective test chambers to achieve parallel testing and avoid errors. Furthermore, the entire process from testing to cleaning only requires inputting the preset testing and rinsing procedures into the control module, which then performs automated integrated operation; the control logic is simple and the real-time efficiency is high. Moreover, relevant data can be directly input into the control module for analysis and calculation during the testing process, and the performance indicators of the target reverse osmosis membrane can be directly obtained after the test, which is highly efficient, convenient, and yields more accurate results.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the integrated testing device for reverse osmosis membranes described in this embodiment; Figure 2 This is a flowchart of the integrated testing method for reverse osmosis membranes described in this embodiment; The attached diagram is labeled as follows: 01 concentrated water collection chamber, 02 product water collection chamber, 03 test chamber, 04 brine test tank, 05 brine dosing tank, 06 inlet water conductivity meter, 07 inlet water electromagnetic flow meter, 08 inlet water pH meter, 09 inlet water ORP meter, 10 temperature control unit, 11 heat exchanger, 12 temperature sensor, 13 inlet water pressure transmitter, 14 inlet water pressure gauge, 15 check valve, 16 clean water rinsing tank, 17 acid water rinsing tank, 18 alkaline water rinsing tank, 19 acid water dosing tank, 20 alkaline water dosing tank, 21 Y-type filter, 22 security filter, 23 controller, 24 constant pressure control pump, 25 feed pump, 26 high pressure pump. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art.

[0023] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, wholes, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Reverse osmosis membranes can be used to filter various impurities in water as needed to meet specific application requirements. In order to improve the filtration quality of reverse osmosis membranes, repeated research and development tests are required to ensure that they have good filtration performance for target impurities. However, the current reverse osmosis membrane research and development tests and subsequent cleaning still have the following defects: (1) Most existing testing devices can only support the testing of a single reverse osmosis membrane, which leads to the inability to guarantee the consistency of experimental conditions when the same batch of reverse osmosis membranes are tested in parallel. This results in unavoidable objective and subjective errors in the test results, which not only affect the testing efficiency but also the accuracy. (2) Current testing devices are mostly set up independently from cleaning devices. Both testing devices and cleaning devices are mostly based on manual control during operation, which also reduces the overall testing efficiency. Based on this, this embodiment aims to provide an integrated testing device suitable for reverse osmosis membranes to solve the above-mentioned technical defects at the same time.

[0025] The integrated testing device for reverse osmosis membranes described in this embodiment will be described in detail below with reference to the accompanying drawings.

[0026] Combination Figure 1As shown, the device includes a control module, and a water collection module, a testing module, and a flushing module that cooperate with the control module. The water collection module is used to collect water before and after treatment by the target reverse osmosis membrane; the testing module is used to perform testing on the target reverse osmosis membrane; and the flushing module is used to clean the target reverse osmosis membrane.

[0027] In terms of specific structural design, the water collection module includes a concentrate collection chamber 01 and a product water collection chamber 02. The inlet end of the product water collection chamber 02 is equipped with a product water conductivity meter and a product water electromagnetic flow meter for online real-time measurement of key parameters of the water treated by the target reverse osmosis membrane.

[0028] The test module includes several test chambers 03, a brine test tank 04, and several brine dosing tanks 05. The parallel arrangement of multiple test chambers 03 allows for parallel testing of multiple target reverse osmosis membranes, avoiding random testing errors due to inconsistent conditions. Specifically, to facilitate the fixation of the target reverse osmosis membrane, a clamping frame is placed within any test chamber 03; the clamping frame is positioned along the body diagonal of the test chamber. The brine test tank 04 is connected to the brine dosing tank 05; the inlet side of any test chamber 03 is connected to the inlet of the concentrate collection chamber 01 via a control valve, and the outlet side is connected to the inlet of the permeate collection chamber 02 via a control valve. The inlet of the brine test tank 04 is connected to the brine dosing tank 05 via a control valve, and the outlet is connected to the inlet side of any test chamber 03 via a control valve. To facilitate the delivery of various solutions, a feed pump 25 is also provided, located on the inlet side of the test chamber 03. The brine test tank 04 is equipped with an inlet water conductivity meter 06 and an inlet water electromagnetic flow meter 07 between its outlet and the inlet side of any test chamber 03. In practice, the brine in the test tank 04 is replenished by opening and closing corresponding control valves, and the brine is also introduced into the corresponding test chamber 03 for testing. The inlet water conductivity meter 06 and the inlet water electromagnetic flow meter 07 are used to acquire key parameters of the inlet water in real time to facilitate performance analysis of the target reverse osmosis membrane.

[0029] As a more specific implementation, the test module also includes an inlet pH tester 08 and an inlet ORP tester 09; both are placed between the inlet side of the saline test tank and any test chamber, thereby enabling real-time acquisition of the pH value and oxidation-reduction potential of the test saline.

[0030] In a more specific implementation, the test module includes an inlet pressure transmitter 13 and an inlet pressure gauge 14, both placed on the inlet side of any test chamber. This enables pressure measurement of the test saline solution. Simultaneously, a high-pressure pump 26 is provided to deliver the test saline solution into the corresponding test chamber 03 at a preset pressure value.

[0031] Furthermore, the saline dosing tank 05 includes a first saline dosing tank and a second saline dosing tank; the first saline dosing tank contains a pre-prepared NaCl solution of a target concentration, and the second saline dosing tank contains a pre-prepared NaClO solution of a target concentration. By simultaneously introducing both into the saline test tank 04, mixed solutions with different residual chlorine concentrations can be prepared.

[0032] The rinsing module includes a clean water rinsing tank 16, an acid water rinsing tank 17, an alkaline water rinsing tank 18, an acid water dosing tank 19, and an alkaline water dosing tank 20. Specifically, the corresponding acid water is a citric acid solution, and the alkaline water is a NaOH solution. The outlets of the clean water rinsing tank 16, the acid water rinsing tank 17, and the alkaline water rinsing tank 18 are all connected to the inlet side of each test chamber 03 via control valves; the acid water dosing tank 19 is connected to the inlet of the acid water rinsing tank 17 via a control valve, and the alkaline water dosing tank 20 is connected to the inlet of the alkaline water rinsing tank 18 via a control valve. In specific implementation, the target reverse osmosis membrane in the test chamber 03 is acid-washed by rinsing with clean water through the clean water rinsing tank 16, and by storing the pre-prepared acid water in the acid water rinsing tank 17 through the acid water dosing tank 19; and by storing the pre-prepared alkaline water in the alkaline water rinsing tank 18 through the alkaline water dosing tank 20.

[0033] In a preferred embodiment, to prevent impurities from entering the test chamber 03 through the test brine and cleaning solution and damaging the target reverse osmosis membrane, a filtration module is also provided. Specifically, this includes a Y-type filter 21 and a security filter 22 connected in sequence. The Y-type filter 21 is used to filter large particulate impurities, and the security filter 22 is used to filter small particulate impurities. Specifically, the inlet of the Y-type filter 21 is connected to the outlet of the brine test tank 04, the clean water rinsing tank 16, the acid water rinsing tank 17, and the alkaline water rinsing tank 18, and the outlet of the security filter 22 is connected to the inlet side of each test chamber 03.

[0034] To prevent backflow of the solution during testing and cleaning, a check valve 15 is installed on the water inlet side of each test chamber.

[0035] Simultaneously considering that the temperature of the test brine during the testing process will affect the performance of the target reverse osmosis membrane, and the temperature of the cleaning solution will affect the cleaning effect on the target reverse osmosis membrane, the device also includes a temperature control module. This module includes a heat exchanger 11, a temperature control unit 10, and a temperature sensor 12. The temperature control unit 10 is communicatively connected to the heat exchanger 11; the brine test chamber 04, the clean water rinsing chamber 16, the acid water rinsing chamber 17, and the alkaline water rinsing chamber 18 are connected to the inlet side of each test chamber 03 through the heat exchanger 11; the temperature sensor 12 is used to measure the inlet water temperature of each test chamber 03. Furthermore, the controller 23 is communicatively connected to the temperature control unit 10 and is used to send temperature control commands to the temperature control unit 10 to adjust the temperature of the heat exchanger 11; simultaneously, the controller 23 is communicatively connected to the temperature sensor 12 to obtain the real-time inlet water temperature. This enables real-time feedback of the temperature conditions of the test brine and the current actual temperature, achieving closed-loop temperature control.

[0036] The control module includes a controller 23. The controller 23 is communicatively connected to all control valves, the product water conductivity meter, the product water electromagnetic flow meter, the feed water conductivity meter, and the feed water electromagnetic flow meter. It is used to control the corresponding control valves to open or close at a target opening degree based on user commands for testing and / or flushing processes. Simultaneously, it acquires data from the product water conductivity meter, the product water electromagnetic flow meter, the feed water conductivity meter, and the feed water electromagnetic flow meter in real time to obtain the system performance indicators corresponding to the target reverse osmosis membrane. In specific implementations, a constant pressure control pump 24 is also installed at the control end of the control module to achieve stable flow control of various solutions.

[0037] Based on the aforementioned device, on the one hand, when multiple target reverse osmosis membranes need to be tested, they can be placed in their respective test chambers to achieve parallel testing and avoid errors. On the other hand, the entire process from testing to cleaning only requires inputting the preset testing and rinsing procedures into the control module, which then performs automated integrated operation; this not only simplifies the control logic but also ensures high real-time efficiency. Furthermore, during the testing process, relevant data can be directly input into the control module for analysis and calculation. After the test, the performance indicators of the target reverse osmosis membrane can be directly obtained, which is highly efficient, convenient, and yields more accurate results.

[0038] Furthermore, this embodiment also provides an integrated testing method suitable for reverse osmosis membranes, which is based on the aforementioned device. Combined with... Figure 2 As shown, the method includes: Step 202: Place several target reverse osmosis membranes into the test chamber one by one, and store the pre-prepared saline, acidic, and alkaline solutions in the corresponding saline, acidic, and alkaline solution dosing tanks, respectively.

[0039] Step 204: The controller of the control module obtains the test command and controls the corresponding control valve to open and / or close according to the preset opening degree, thereby realizing the test of each target reverse osmosis membrane.

[0040] In practice, the test instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level in the brine test tank, the inlet water flow rate, and the inlet water duration.

[0041] As a preferred embodiment, to improve the accuracy of the test, the method further includes the following step before step S204: Step S20302: The controller of the control module obtains the pre-rinse command to execute the pre-cleaning process.

[0042] In practice, the pre-rinsing instructions include the liquid level in the clean water rinsing tank and the flow rate of the clean water. Step S20304: Obtain data from each product water conductivity meter in real time to determine if the pre-rinsing meets the preset pre-rinsing effect and end the pre-rinsing process.

[0043] At this point, the pre-cleaning process based on steps S20302 to S20304 can ensure the cleanliness of the entire test chamber and pipeline, and pre-clean the target reverse osmosis membrane to be tested to avoid impurities interfering with the test results.

[0044] As a preferred embodiment, the method further includes the following steps to meet the testing requirements under different temperature conditions for the test saline solution: Step 20402: Obtain the temperature control command and input it into the temperature control unit to adjust the temperature gradient of the heat exchanger, thereby achieving temperature gradient adjustment of the test brine.

[0045] Step 206: When the test is completed, obtain the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter to calculate the system performance parameters corresponding to each target reverse osmosis membrane.

[0046] Step 208: The controller of the control module obtains the rinsing command to execute the cleaning process.

[0047] In specific implementation, the flushing instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level height of the clean water flushing tank, the liquid level height of the acid water flushing tank, the liquid level height of the alkaline water flushing tank, the flushing sequence of various flushing solutions, and the flushing flow rate.

[0048] Step 210: Acquire data from each product water conductivity meter in real time to determine when the rinsing meets the preset effect and end the cleaning process; send an end prompt to the front end of the control module to prompt that each target reverse osmosis membrane be removed from the corresponding test chamber and end the integrated test.

[0049] As a specific implementation method, the following testing and cleaning process was performed on the target reverse osmosis membrane module of model LW-AP8040-400(34). Specifically, the effective membrane area of ​​this model of target reverse osmosis membrane module is 37.2m². 2 The target average water production is 39.7 m³. 3 / d.

[0050] The testing process is as follows: (1) Brine Test: After pre-rinsing the target reverse osmosis membrane module, the flux and desalination rate under different temperature conditions are tested. Based on this, firstly, the control module is activated, and the first brine dosing tank is set to prepare a test solution with a concentration of 2000±100PPM, which is then pumped into the brine test tank. At this time, the magnetic level gauge in the brine test tank can automatically control the liquid level, stopping automatically when the preset liquid level is reached. Then, the constant pressure control pump is activated to sequentially pass the test brine solution through the feed pump, Y-type filter, security filter, heat exchanger, and high-pressure pump into the corresponding test chamber. During this process, the temperature of the temperature control unit is set to 10℃, the influent pH value is controlled at 7.5±0.5, and the standard test pressure is controlled at 1.55±0.02MPa, with a test every 5℃ interval. Simultaneously, various data are collected through the control module, and a set of data is tested. During this process, the temperature test range is 10-35℃, with each temperature increment being 5℃, until the test temperature reaches 35℃.

[0051] (2) Low-oxidation brine circulation test: First, flush the membrane module with deionized water until the conductivity of the concentrate side drainage is less than 20 μS / cm. Prepare mixed solutions with different salt contents and sodium hypochlorite (e.g., residual chlorine of 0.3, 0.5, and 0.7 mg / L) through the first and second brine dosing tanks. Turn on the high-pressure pump and adjust the operating pressure to the corresponding value according to the type of membrane module. Circulate the solution under the standard pressure. Record the desalination rate of the membrane module and the residual chlorine value of the raw water every 4 hours. If the residual chlorine value of the raw water becomes low, add sodium hypochlorite and test it with a residual chlorine meter until the value is reached.

[0052] The cleaning process is as follows: Drain residual water: Open the corresponding control valve to drain the remaining test solution in the test chamber.

[0053] Preparation of cleaning solution: The acid or alkaline water rinsing tank is filled by an acid or alkaline water dosing tank. Simultaneously, the pH value and temperature of the cleaning solution are checked using an inlet pH meter and a temperature sensor to ensure they meet requirements. Preferably, the cleaning solution temperature is not lower than 25℃.

[0054] Low-pressure circulating cleaning: Set the flow rate to 1 / 3 of the normal cleaning flow rate and the pressure to 20-40 psi via the control module. Introduce the cleaning solution into the test chamber, discarding the initial return water to prevent dilution. Circulate the cleaning solution in the pipeline for 5-10 minutes. Observe the pH value of the return solution. If it becomes significantly turbid or the pH value changes by more than 0.5, replenish the solution by opening the acid or alkali water dosing tank before resuming the above operations.

[0055] Immersion and intermittent circulation: Close the corresponding control valve to immerse the target reverse osmosis membrane module in the cleaning solution within the corresponding test chamber. Adjust the immersion time according to the fouling level of the membrane module. Depending on the characteristics, lightly fouled modules require 1-2 hours of immersion, while heavily fouled modules require 10-15 hours or overnight. During immersion, the cleaning solution temperature must be maintained at no less than 25°C.

[0056] High-flow circulation cleaning: The cleaning flow rate is set to 1.5 times the normal cleaning flow rate through the control module to remove contaminants loosened by the cleaning solution. The circulation time is 30-60 minutes.

[0057] Rinsing: First, rinse the target reverse osmosis membrane with the permeate from the target reverse osmosis membrane for about 5 minutes, and then rinse with pretreated permeate for 20-30 minutes to completely flush out the cleaning solution without any residue. The temperature during the rinsing process should not be lower than 20℃.

[0058] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An integrated testing device suitable for reverse osmosis membranes, characterized in that, include: The water collection module includes a concentrate collection chamber and a product water collection chamber; the inlet end of the product water collection chamber is equipped with a product water conductivity meter and a product water electromagnetic flow meter. The testing module includes several testing chambers, a saline testing tank, and several saline dosing tanks. The saline testing tank is connected to the saline dosing tank. The inlet side of any testing chamber is connected to the inlet of the concentrate collection chamber via a control valve, and the outlet side is connected to the inlet of the product water collection chamber via a control valve. The inlet of the saline testing tank is connected to the saline dosing tank via a control valve, and the outlet is connected to the inlet side of any testing chamber via a control valve. An inlet conductivity meter and an inlet electromagnetic flow meter are also installed between the outlet of the saline testing tank and the inlet side of any testing chamber. The rinsing module includes a clean water rinsing tank, an acid water rinsing tank, an alkaline water rinsing tank, an acid water dosing tank, and an alkaline water dosing tank; wherein the outlets of the clean water rinsing tank, the acid water rinsing tank, and the alkaline water rinsing tank are all connected to the inlet side of each test chamber via control valves; the acid water dosing tank is connected to the inlet of the acid water rinsing tank via a control valve, and the alkaline water dosing tank is connected to the inlet of the alkaline water rinsing tank via a control valve; The control module includes a controller, which is communicatively connected to all control valves, product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter. The controller is used to control the corresponding control valves to open or close according to the target opening degree based on user commands for testing and / or flushing processes. At the same time, it acquires data from the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter in real time to obtain the system performance indicators corresponding to the target reverse osmosis membrane.

2. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, include: The filtration module includes a Y-type filter and a security filter connected in sequence; The inlet of the Y-type filter is connected to the outlet of the salt water test tank, the clean water rinsing tank, the acid water rinsing tank, and the alkaline water rinsing tank, and the outlet of the security filter is connected to the inlet of each test chamber.

3. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, include: The temperature control module includes a heat exchanger, a temperature control unit, and a temperature sensor; the temperature control unit is communicatively connected to the heat exchanger; the brine test chamber, clean water rinsing chamber, acid water rinsing chamber, and alkaline water rinsing chamber are connected to the water inlet side of each test chamber through the heat exchanger; the temperature sensor is used to measure the water inlet temperature of each test chamber. The controller is communicatively connected to the temperature control unit and is used to send temperature control commands to the temperature control unit to adjust the temperature of the heat exchanger; at the same time, the controller is communicatively connected to the temperature sensor to obtain the real-time inlet water temperature.

4. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, The testing module includes an inlet pH tester and an inlet ORP tester; both are placed between the saline test tank and the inlet side of any test chamber.

5. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, The test module includes an inlet pressure transmitter and an inlet pressure gauge; both are placed on the inlet side of any test chamber.

6. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, A clamping frame is placed inside any test chamber; the clamping frame is arranged along the body diagonal of the test chamber and is used to fix the target reverse osmosis membrane.

7. The integrated testing device for reverse osmosis membranes according to claim 1, characterized in that, The saline dosing tank includes a first saline dosing tank and a second saline dosing tank; the first saline dosing tank contains a pre-prepared NaCl solution of a target concentration, and the second saline dosing tank contains a pre-prepared NaClO solution of a target concentration.

8. An integrated testing method suitable for reverse osmosis membranes, characterized in that, Performed using the apparatus according to any one of claims 1 to 7, comprising: Several target reverse osmosis membranes were placed one by one in the test chamber, and pre-prepared saline, acidic and alkaline solutions were stored in the corresponding saline dosing tank, acidic dosing tank and alkaline dosing tank, respectively. The controller of the control module receives test instructions and controls the corresponding control valve to open and / or close at a preset opening degree, thereby realizing the testing of each target reverse osmosis membrane; wherein, the test instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level height of the brine test tank, the inlet water flow rate, and the inlet water duration; When the test is completed, the system performance parameters corresponding to each target reverse osmosis membrane are calculated by acquiring the product water conductivity meter, product water electromagnetic flow meter, feed water conductivity meter, and feed water electromagnetic flow meter. The controller of the control module obtains flushing instructions to execute the cleaning process; wherein, the flushing instructions include: the test chamber number where the target reverse osmosis membrane is placed, the liquid level height of the clean water flushing tank, the liquid level height of the acid water flushing tank, the liquid level height of the alkaline water flushing tank, the flushing sequence of various flushing solutions, and the flushing flow rate. The system acquires real-time data from each product water conductivity meter to determine when the rinsing process meets the preset effect and ends the cleaning process; it also sends an end prompt to the front end of the control module to prompt the removal of each target reverse osmosis membrane from its corresponding test chamber and end the integrated test.

9. The integrated testing method for reverse osmosis membranes according to claim 8, characterized in that, The controller of the control module receives test commands and controls the corresponding control valve to open and / or close at a preset opening degree, thereby enabling the testing of each target reverse osmosis membrane, including: The controller of the control module receives a pre-rinse command to execute the pre-cleaning process; wherein, the pre-rinse command includes the liquid level height of the clean water rinsing tank and the flow rate of the clean water; The pre-rinse process ends when the pre-rinse meets the preset pre-rinse effect by acquiring data from the conductivity tester of each product water in real time.

10. The integrated testing method for reverse osmosis membranes according to claim 8, characterized in that, The controller of the control module receives test commands and controls the corresponding control valves to open and / or close at preset opening degrees, thereby enabling the testing of each target reverse osmosis membrane, including: The temperature control command is obtained and input into the temperature control unit to adjust the temperature gradient of the heat exchanger, thereby achieving temperature gradient adjustment of the test brine.

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