CN113244775A - Dynamic evaluation device and method for performance of calcium sulfate cleaning agent of reverse osmosis membrane - Google Patents
Dynamic evaluation device and method for performance of calcium sulfate cleaning agent of reverse osmosis membrane Download PDFInfo
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- CN113244775A CN113244775A CN202110711661.5A CN202110711661A CN113244775A CN 113244775 A CN113244775 A CN 113244775A CN 202110711661 A CN202110711661 A CN 202110711661A CN 113244775 A CN113244775 A CN 113244775A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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Abstract
The invention discloses a dynamic evaluation device and method for performance of a reverse osmosis membrane calcium sulfate cleaning agent, which comprises the following steps: the device comprises a test water tank, a heat exchanger, a high-pressure pump, a cartridge filter, a reverse osmosis membrane assembly, a pressure gauge, a flowmeter, a pipeline valve, a thermometer and a conductivity meter; the reverse osmosis membrane component is provided with a water inlet, a concentrated water port and a water production port, the water inlet is communicated with the test water tank through a first pipeline, the concentrated water port is communicated with the test water tank through a second pipeline, a fourth pipeline is further arranged between the first flowmeter and the first pressure gauge, and the water production port is further connected with a third pipeline. The dynamic evaluation device for the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane reduces the working condition of the reverse osmosis membrane to the greatest extent, comprehensively and dynamically evaluates the performance of the calcium sulfate cleaning agent under the condition, greatly improves the accuracy of evaluating the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane, and provides a more effective hardware support platform for technical research and development and industrial application in the field of reverse osmosis water treatment agents.
Description
Technical Field
The invention relates to the technical field of reverse osmosis water treatment, and mainly relates to a dynamic evaluation device and method for performance of a reverse osmosis membrane calcium sulfate cleaning agent. In particular to a dynamic evaluation device and an evaluation method for comprehensively evaluating the performance of a calcium sulfate cleaning agent of a reverse osmosis membrane under the condition of simulating the actual working condition of a project aiming at the calcium sulfate pollution of the reverse osmosis membrane.
Background
Reverse osmosis is a new membrane separation technology developed in the 60's of the 20 th century and is a process of separating a solvent from a solute in a solution under pressure by means of a reverse osmosis membrane. Compared with the traditional water treatment technology, the method has the advantages of high treatment efficiency, low chemical reagent addition, capability of realizing seawater desalination, wastewater recycling and the like, and gradually becomes a new technology for solving the problems of energy, resources, environment and the like.
In the operation process of the reverse osmosis membrane, particulate matters, colloids, organic matter macromolecules, inorganic ions, microorganisms and the like in water have physical, chemical or mechanical effects with the reverse osmosis membrane, so that the substances are adsorbed, deposited, blocked and the like on the surface of the reverse osmosis membrane to form a membrane pollution phenomenon, and the membrane performance is further reduced, the separation efficiency is reduced, and even the service life of the membrane is influenced. Calcium sulfate scale is one of common inorganic salt precipitates, is difficult to remove and can cause irreversible pollution to a reverse osmosis membrane, so that the water yield of a system is abnormal, the salt rejection rate is reduced, and the effluent quality and the service life of a reverse osmosis membrane component are seriously influenced. For the calcium sulfate scaling problem of the reverse osmosis membrane, factors such as time efficiency, cost, practical application of field engineering and the like are comprehensively considered, and the regular cleaning by adopting a special cleaning agent is still a necessary means.
The performance of the cleaning agent can be statically evaluated by adopting a laboratory dissolution experiment aiming at the calcium sulfate scale, the method can transversely compare the performance of the calcium sulfate scale dissolved by different cleaning agents to a certain extent, and the difference between the performance of the cleaning agent and the actual operation working condition of a reverse osmosis membrane is still certain. In addition, the static method can only evaluate the dissolving performance of the cleaning agent on calcium sulfate, but cannot evaluate the influence of the cleaning agent on the performance of the reverse osmosis membrane (such as membrane flux, salt rejection rate and the like). At present, no public report exists on a dynamic evaluation method for the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane, so that efficient and accurate screening and application of the calcium sulfate cleaning agent are difficult.
Disclosure of Invention
The invention provides a dynamic evaluation device for performance of a calcium sulfate cleaning agent of a reverse osmosis membrane, and aims to solve the technical problem that efficient and accurate screening and application of the calcium sulfate cleaning agent are difficult because a dynamic evaluation method for performance of the calcium sulfate cleaning agent of the reverse osmosis membrane in the prior art is not reported in a public way.
A reverse osmosis membrane calcium sulfate cleaner performance dynamic evaluation device includes: the device comprises a test water tank, a heat exchanger, a high-pressure pump, a cartridge filter, a reverse osmosis membrane assembly, a pressure gauge, a flowmeter, a pipeline valve, a thermometer and a conductivity meter;
the heat exchanger is arranged in the test water tank, the thermometer is arranged on the test water tank, the test water tank is also provided with a first conductivity meter, the reverse osmosis membrane component is provided with a water inlet, a concentrated water port and a water production port, the water inlet is communicated with the test water tank through a first pipeline, the concentrated water port is communicated with the test water tank through a second pipeline, a first pipeline valve, a high-pressure pump, a first flowmeter, a security filter, a fourth pipeline valve and a first pressure gauge are sequentially arranged on the first pipeline along the direction from the test water tank to the reverse osmosis membrane component, a fourth pipeline is further arranged between the first flowmeter and the first pressure gauge, a second pipeline valve is arranged on the fourth pipeline, a second pressure gauge and a third pipeline valve are sequentially arranged on the second pipeline along the direction from the reverse osmosis membrane component to the test water tank, the water production port is also connected with a third pipeline, and a second flowmeter and a second conductivity meter are sequentially arranged on the third pipeline.
Preferably, the material of the test water tank is plastic.
Preferably, the heat exchanger is made of a seawater corrosion resistant metal material.
Preferably, the heat exchanger is provided with a spiral pipeline which comprises a water inlet end and a water outlet end.
Preferably, the high-pressure pump is provided as a plunger-type high-pressure pump or a centrifugal-type high-pressure pump.
Preferably, the cartridge filter includes a housing and a filter element installed inside the housing, and the housing is made of a seawater corrosion resistant material.
Preferably, the filter precision of the filter element is set to be 50-100 μm.
Preferably, the reverse osmosis membrane module comprises a reverse osmosis membrane and a membrane support body.
The invention also provides a dynamic evaluation method for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, which is based on the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent and comprises the following steps:
initially operating a reverse osmosis membrane;
calcium sulfate contamination of reverse osmosis membranes;
cleaning a reverse osmosis membrane;
cleaning the reverse osmosis membrane and then operating;
wherein the initial operation of the reverse osmosis membrane is specifically as follows: starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, enabling seawater to enter a reverse osmosis membrane component from a water tank through a high-pressure pump and a security filter, detecting through a thermometer, a conductivity meter and a flowmeter, enabling the system to detect and collect parameters of the reverse osmosis membrane in an initial operation state under a stable condition, and calculating membrane flux and desalination rate; the membrane flux was calculated as: after the system is stable, detecting the instantaneous water production flow of the water production pipeline, and calculating to obtain the membrane flux through the water production flow per unit area, wherein the calculation formula of the desalination rate is as follows:
the reverse osmosis membrane calcium sulfate pollution specifically comprises the following steps: preparing a saturated solution of calcium sulfate in a test water tank, starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, closing a fourth pipeline valve, and opening a second pipeline valve to enable the calcium sulfate solution to enter a reverse osmosis membrane component from the water tank through the fourth pipeline;
the reverse osmosis membrane cleaning specifically comprises the following steps: injecting reverse osmosis product water or other water with the same ion concentration into a test water tank, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis product water or other water with the same ion concentration enters a reverse osmosis membrane component from the water tank through a high-pressure pump and a cartridge filter; adding a reverse osmosis membrane calcium sulfate cleaning agent into a test water tank, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis membrane calcium sulfate cleaning agent enters a reverse osmosis membrane assembly from the water tank through a high-pressure pump and a cartridge filter;
injecting reverse osmosis product water or other water with the same ion concentration into the test water tank again, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis product water or other water with the same ion concentration enters a reverse osmosis membrane component from the water tank through a high-pressure pump and a cartridge filter;
the operation after the reverse osmosis membrane is cleaned is as follows: injecting seawater into a test water tank, starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, stably operating the device for 24 hours, and detecting the membrane flux and the salt rejection rate.
Preferably, the method further comprises calcium ion monitoring, wherein the calcium ion monitoring specifically comprises: sampling is carried out periodically, and the concentration of calcium ions in the water tank is detected by adopting a titration method or an ion chromatography method thereof.
The dynamic evaluation device for the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane reduces the working condition of the reverse osmosis membrane to the maximum extent, dynamically evaluates the performance of the calcium sulfate cleaning agent under the condition, fills the gap, and greatly improves the accuracy of evaluating the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a dynamic evaluation device for performance of a reverse osmosis membrane calcium sulfate cleaning agent.
Wherein the reference numbers are as follows:
1: a test water tank; 2: a heat exchanger; 3: a high pressure pump; 4: a cartridge filter; 5: a reverse osmosis membrane module; 6-1: a first pressure gauge; 6-2: a second pressure gauge; 7-1: a first flow meter; 7-2: a second flow meter; 8-1: a first pipeline valve; 8-2: a second pipeline valve; 8-3: a third pipeline valve; 8-4: a fourth pipeline valve; 9-a thermometer; 10: a first pipeline; 11: a second pipeline; 12: a third pipeline; 13: a fourth pipeline; 14-1: a first conductivity meter; 14-2: a second conductivity meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent comprises: the device comprises a test water tank 1, a heat exchanger 2, a high-pressure pump 3, a security filter 4, a reverse osmosis membrane component 5, a pressure gauge, a flowmeter, a pipeline valve, a thermometer 9 and a conductivity meter.
Wherein, the heat exchanger 2 is arranged in the test water tank 1, the thermometer 9 is arranged on the test water tank 1, the test water tank is also provided with a first conductivity meter 14-1, the reverse osmosis membrane component 5 is provided with a water inlet, a concentrated water port and a water production port, the water inlet of the reverse osmosis membrane component 5 is communicated with the test water tank 1 through a first pipeline 10, the concentrated water port is communicated with the test water tank 1 through a second pipeline 11, the first pipeline 10 is sequentially provided with a first pipeline valve 8-1, a high pressure pump 3, a first flow meter 7-1, a security filter 4, a fourth pipeline valve 8-4 and a first pressure gauge 6-1 along the direction from the test water tank 1 to the reverse osmosis membrane component 5, a fourth pipeline 13 is also arranged between the first flow meter 7-1 and the first pressure gauge 6-1, the fourth pipeline 13 is provided with a second pipeline valve 8-2, a second pressure gauge 6-2 and a third pipeline valve 8-3 are sequentially arranged on the second pipeline 11 along the direction from the reverse osmosis membrane module 5 to the test water tank 1, a water production port of the reverse osmosis membrane module 5 is also connected with a third pipeline 12, and a second conductivity meter 14-2 and a second flowmeter 7-2 are sequentially arranged on the third pipeline 12.
In this embodiment, the material of the test water tank 1 is plastic, so as to avoid corrosion caused by long-time contact with seawater. The test water tank has three purposes in the device: (1) calcium sulfate solution is contained in the reverse osmosis membrane pollution process; (2) cleaning agent is contained in the reverse osmosis membrane cleaning process; (3) the reverse osmosis membrane washing process is used for containing reverse osmosis produced water or deionized water.
The material of heat exchanger 2 in this embodiment is resistant sea water corrosion metal material, preferred titanium alloy, and its form is spiral metal pipeline, including intaking end and play water end, keeps warm or cools off through external different temperature water sources to the liquid medium in the test water tank.
The high pressure pump 3 in this embodiment is in the form of a plunger type high pressure pump or a centrifugal type high pressure pump for powering the water inlet side of the reverse osmosis membrane module.
The cartridge filter 4 in this embodiment comprises a housing, preferably made of stainless steel, and a filter element mounted inside the housing, the filter element having a filtration accuracy of 50-100 μm for filtering after the liquid medium has entered.
The reverse osmosis membrane module 5 in this embodiment includes a reverse osmosis membrane and a membrane support body, and is used for performing reverse osmosis treatment on a liquid medium, and the reverse osmosis membrane may be a commercially available membrane module, for example: type Dow SW30-2540 reverse osmosis seawater membrane.
In this embodiment, the pressure gauge is used for measuring the pressure of the pipeline, the flowmeter is used for measuring the flow rate of the liquid medium, the pipeline valve is used for opening or closing the pipeline to realize the flow and the cutoff of the liquid medium, and the thermometer 9 is used for measuring the temperature of the liquid medium in the test water tank 1.
In this embodiment, the first pipeline 10 is provided as a water inlet pipeline, which guides the medium in the test water tank 1 to the reverse osmosis membrane module 5; the second pipeline 11 is a concentrated water pipeline which guides the concentrated water treated by the reverse osmosis membrane component 5 into the test water tank 1; the third pipeline 12 is set as a water production pipeline and leads out the pure water treated by the reverse osmosis membrane component 5 for use; the fourth pipeline 13 is set as a water inlet bypass which is set to be opened at the calcium sulfate pollution stage of the reverse osmosis membrane to realize the calcium sulfate pollution of the reverse osmosis membrane.
The reverse osmosis membrane component of one embodiment of the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent selects a Dow SW30-2540 type reverse osmosis seawater membrane, the basic parameters of which are shown in Table 1, and test water is seawater and is pretreated by secondary sand filtration.
TABLE 1 SW30-2540 reverse osmosis membrane Main Specification
The dynamic evaluation method for the performance of the reverse osmosis membrane calcium sulfate cleaning agent is realized by the following technical scheme:
(1) initial operation
Installing a new Dow SW30-2540 reverse osmosis membrane, washing with seawater (0.2-0.4MPa), checking whether a leakage point exists in the washing process, and fastening or repairing the leakage point. And after the low-pressure flushing is carried out for at least 30 minutes, the high-pressure pump is started, the water inlet pressure is slowly increased to 4.6MPa through a third pipeline valve, the continuous operation is carried out for 1 hour, the test temperature is 25-30 ℃, and the initial parameters of the system are recorded after the conductivity of the produced water is stable. Continuously operating the reverse osmosis device for 24h, recording the produced water flow at intervals of 1h, testing the inflow water conductivity G1 and the produced water conductivity D2 by a conductivity meter, further calculating the membrane flux and the salt rejection rate of the reverse osmosis membrane in the initial operation state, and calculating the average membrane flux F1 and the average salt rejection rate D1 within 24h, wherein the calculation mode of the membrane flux F1 is as follows: after the system is stable, detecting the instantaneous water production flow of the water production pipeline every 1 hour, and calculating to obtain the membrane flux through the water production flow per unit area, wherein the calculation formula of the average desalination rate D1 is as follows:
(2) Calcium sulfate contamination of reverse osmosis membranes
At a temperature of 25 ℃, the saturation solubility of calcium sulfate in water is about 2000mg/L, and considering the influence of concentration polarization, the calcium sulfate solution with the concentration of 2000mg/L reaches the surface of the membrane and reaches a saturation state, and then calcium sulfate deposition occurs. Before the test is started, the test water tank is emptied, about 100L of deionized water is injected, 200g of calcium sulfate analytical reagent is added and mixed uniformly, so that the concentration of calcium sulfate in the water tank is about 2000mg/L, and the corresponding concentration of calcium ions is 800 mg/L.
Starting the dynamic evaluation device for the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane, closing the valve of the fourth pipeline, and opening the valve of the second pipeline, so that the calcium sulfate solution enters the reverse osmosis membrane component from the water tank through the fourth pipeline; the concentration of calcium ions in the water tank was periodically sampled to estimate the deposition amount of calcium sulfate on the membrane surface, and the change of the membrane flux with the test time was recorded. And stopping the calcium sulfate pollution process when the water yield is reduced by 10-15%, obtaining the flux F2 of the reverse osmosis membrane at the moment, and then cleaning the reverse osmosis membrane.
(3) Reverse osmosis membrane cleaning
The cleaning test procedure was as follows: firstly, adopting reverse osmosis product water to carry out circulating flushing for 1 hour; cleaning for 1 hour circularly by adopting a cleaning agent and soaking for 2 hours statically, wherein the step runs for 5 cycles circularly; thirdly, circularly flushing by adopting reverse osmosis product water again, and recording at intervals of 1h until the water flux of the reverse osmosis membrane is stable.
(4) The reverse osmosis membrane is cleaned and then operated
And after the cleaning is finished, continuously using seawater as a water inlet source to operate the reverse osmosis device for 24h, recording the membrane flux and the desalination rate at an interval of 1h during the operation period, and calculating the average membrane flux F3 and the average desalination rate D2 within 24 h.
The performance of the calcium sulfate cleaning agent is evaluated by adopting two indexes of membrane flux recovery rate and membrane damage.
The dynamic evaluation device for the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane reduces the working condition of the reverse osmosis membrane to the maximum extent, dynamically evaluates the performance of the calcium sulfate cleaning agent under the condition, fills the gap, and greatly improves the accuracy of evaluating the performance of the calcium sulfate cleaning agent of the reverse osmosis membrane.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features may be made in the specification without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a reverse osmosis membrane calcium sulfate cleaner performance dynamic evaluation device which characterized in that includes: the device comprises a test water tank, a heat exchanger, a high-pressure pump, a cartridge filter, a reverse osmosis membrane assembly, a pressure gauge, a flowmeter, a pipeline valve, a thermometer and a conductivity meter;
the heat exchanger is arranged in the test water tank, the thermometer is arranged on the test water tank, the test water tank is also provided with a first conductivity meter, the reverse osmosis membrane component is provided with a water inlet, a concentrated water port and a water production port, the water inlet is communicated with the test water tank through a first pipeline, the concentrated water port is communicated with the test water tank through a second pipeline, a first pipeline valve, a high-pressure pump, a first flowmeter, a security filter, a fourth pipeline valve and a first pressure gauge are sequentially arranged on the first pipeline along the direction from the test water tank to the reverse osmosis membrane component, a fourth pipeline is further arranged between the first flowmeter and the first pressure gauge, a second pipeline valve is arranged on the fourth pipeline, a second pressure gauge and a third pipeline valve are sequentially arranged on the second pipeline along the direction from the reverse osmosis membrane component to the test water tank, the water production port is also connected with a third pipeline, and a second flowmeter and a second conductivity meter are sequentially arranged on the third pipeline.
2. The dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 1, wherein the test water tank is made of plastic.
3. The dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 1, wherein the heat exchanger is made of a seawater corrosion resistant metal material.
4. The dynamic evaluation device for the performance of the calcium sulfate cleaning agent for the reverse osmosis membrane according to claim 3, wherein the heat exchanger is arranged into a spiral pipeline and comprises a water inlet end and a water outlet end.
5. The dynamic evaluation device for the performance of the calcium sulfate cleaning agent for the reverse osmosis membrane as claimed in claim 1, wherein the high-pressure pump is a plunger type high-pressure pump or a centrifugal type high-pressure pump.
6. The dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 1, wherein the cartridge filter comprises a shell and a filter element arranged inside the shell, and the shell is made of seawater corrosion resistant material.
7. The dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 6, wherein the filtering precision of the filter element is set to be 50-100 μm.
8. The dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 1, wherein the reverse osmosis membrane module comprises a reverse osmosis membrane and a membrane support body.
9. A dynamic evaluation method for performance of a calcium sulfate cleaning agent of a reverse osmosis membrane is based on the dynamic evaluation device for performance of the calcium sulfate cleaning agent of the reverse osmosis membrane as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
initially operating a reverse osmosis membrane;
calcium sulfate contamination of reverse osmosis membranes;
cleaning a reverse osmosis membrane;
cleaning the reverse osmosis membrane and then operating;
wherein the initial operation of the reverse osmosis membrane is specifically as follows: starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, enabling seawater to enter a reverse osmosis membrane component from a water tank through a high-pressure pump and a security filter, detecting through a thermometer, a conductivity meter and a flowmeter, enabling the system to detect and collect parameters of the reverse osmosis membrane in an initial operation state under a stable condition, and calculating membrane flux and desalination rate; the membrane flux was calculated as: after the system is stable, detecting the instantaneous water production flow of the water production pipeline, and calculating to obtain the membrane flux through the water production flow per unit area, wherein the calculation formula of the desalination rate is as follows:
the reverse osmosis membrane calcium sulfate pollution specifically comprises the following steps: preparing a saturated solution of calcium sulfate in a test water tank, starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, closing a fourth pipeline valve, and opening a second pipeline valve to enable the calcium sulfate solution to enter a reverse osmosis membrane component from the water tank through the fourth pipeline;
the reverse osmosis membrane cleaning specifically comprises the following steps: injecting reverse osmosis product water or other water with the same ion concentration into a test water tank, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis product water or other water with the same ion concentration enters a reverse osmosis membrane component from the water tank through a high-pressure pump and a cartridge filter; adding a reverse osmosis membrane calcium sulfate cleaning agent into a test water tank, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis membrane calcium sulfate cleaning agent enters a reverse osmosis membrane assembly from the water tank through a high-pressure pump and a cartridge filter; injecting reverse osmosis product water or other water with the same ion concentration into the test water tank again, and starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, so that the reverse osmosis product water or other water with the same ion concentration enters a reverse osmosis membrane component from the water tank through a high-pressure pump and a cartridge filter;
the operation after the reverse osmosis membrane is cleaned is as follows: injecting seawater into a test water tank, starting the dynamic evaluation device for the performance of the reverse osmosis membrane calcium sulfate cleaning agent, stably operating the device for 24 hours, and detecting the membrane flux and the salt rejection rate.
10. The dynamic evaluation method for the performance of the reverse osmosis membrane calcium sulfate cleaning agent according to claim 9, characterized by further comprising calcium ion monitoring, wherein the calcium ion monitoring specifically comprises: sampling is carried out periodically, and the concentration of calcium ions in the water tank is detected by adopting a titration method or an ion chromatography method thereof.
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