How often should the RO membrane of the pure water equipment be replaced?

The reverse osmosis membrane in the pure water equipment is generally replaced once every 3-5 years, and the specific replacement depends on the operating environment of the reverse osmosis membrane, for example, if the inlet conditions of the reverse osmosis membrane do not meet the inlet requirements of the reverse osmosis membrane, it is very likely that the reverse osmosis membrane needs to be replaced in 1-2 years.

How often should the reverse osmosis membrane of the pure water equipment be replaced? Usually about 3-5 years. Reverse osmosis membranes are typically made of polymeric materials. The diameter of the surface pores of cellulose acetate membranes, aromatic polyacyl membranes, aromatic polyamide membranes, etc., is usually that the permeability is related to the chemical structure of the membrane itself.

About 2 years. Reverse osmosis water treatment equipment 1, is a quality water supply, pure water for drinking, concentrated water for washing; Ultrafiltration water purifiers are generally used as washing water; 2. When the tap water quality is relatively high-quality, it can also be used as drinking water ultrapure water equipment.

Reverse osmosis pure water equipment mainly uses membrane separation technology to remove impurities, dissolved salts, colloids, microorganisms, organic matter, etc. in water, so as to prepare pure water. When the reverse osmosis pure water system still cannot meet the requirements of water yield or desalination rate after cleaning, the membrane element needs to be replaced. The membrane replacement cycle of reverse osmosis pure water equipment is generally about three years or shortened according to the quality of raw water.

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The general steps of cleaning the RO membrane element: 1. Use a pump to pump the clean, free chlorine-free reverse osmosis product water from the cleaning tank (or the corresponding water source) into the pressure vessel and discharge it for a few minutes. 2. Prepare cleaning solution in the cleaning box with clean product water (different membranes need different cleaning solutions).

3. Circulate the cleaning solution in the pressure vessel for 1 hour or a pre-set time. 4. After the cleaning is completed, drain the cleaning box and rinse, and then fill the cleaning box with clean product water for the next flushing. 5. Use a pump to pump clean, free chlorine-free product water from the cleaning box (or corresponding water source) into the pressure vessel and discharge it for a few minutes.

6. After flushing the reverse osmosis system, run the reverse osmosis system with the product water discharge valve open until the product water is clean, no foam or no cleaning agent (usually 15 to 30 minutes).

Generally, for a family of 5, it is recommended to change it once every two years, and it is generally recommended to update it once every 3 years for a family of 3, but this is not absolute, if you feel that the water purifier in the home has been making water for a longer time than before, or there is scale, or the taste of the water has decreased significantly, after these phenomena appear, it should be a reminder to replace the RO membrane of the water purifier.

Replacing the pre-filter element will protect the service life of the RO membrane, because if the pre-filter element is not replaced for a long time, first, the water flow to RO will be less, and second, the water quality will be dirtier, the working pressure of RO will be greater, and the water quality of produced water will be reduced. It is recommended to update the pre-filter element of the water purifier regularly, and replacing it once every 3-4 months will protect the RO membrane.

The replacement of RO membrane also has a lot to do with the quality of the equipment, the replacement cycle of RO membrane for small systems without special management is generally 1-2 years, and it is easier to use it for 3-5 years with special management, usually for large water treatment systems.

After a period of normal operation, the membrane element can be contaminated with suspended or insoluble substances that may be present in the feed water. Cleaning should be carried out promptly when the performance of the system is reduced by 10% under standard conditions, or when fouling or fouling is evident. Regular water rinsing and chemical dosing can restore the performance of the membrane element and extend the life of the membrane element.

Maintenance:

1. After a period of normal operation, the membrane element will be polluted by suspended solids or insoluble substances that may exist in the feed water. Cleaning should be carried out promptly when the performance of the system is reduced by 10% under standard conditions, or when fouling or fouling is evident. Regular water rinsing and chemical dosing can restore the performance of the membrane element and extend the life of the membrane element.

2. During the short-term shutdown of the system, the system should be flushed every 5 days, and the valve should be closed after flushing to prevent scaling and blockage.

3. If the system is out of operation for a long time (more than 30 days), add 1% sodium bisulfite solution to prevent bacteria from multiplying.

The service life (replacement time) of the RO membrane is uncertain, and will change due to the quality of the RO reverse osmosis influent water.

If the pretreatment fluctuates greatly and the influent water quality of the RO reverse osmosis equipment decreases, it will seriously affect the performance and service life of the RO membrane, and then affect the final water quality, and then the RO membrane needs to be replaced immediately.

The replacement cycle of reverse osmosis membrane is generally 3-5 years, and the specific replacement time depends on whether the daily maintenance and cleaning of the reverse osmosis membrane are timely.

The cleaning cycle of the reverse osmosis membrane is based on the actual pollution situation on site. The normal reverse osmosis (RO) cleaning cycle is every 3-12 months. If it is cleaned more than once in 1 month, it is necessary to improve the pre-treatment, such as additional investment or redesign of the membrane system; If the RO membrane cleaning cycle is 1-3 months, the focus should be on adjusting and optimizing the operating parameters of the existing system.

Even if the reverse osmosis membrane is not polluted for a long time, the membrane will be polluted by other pollutants after adding reverse osmosis scale inhibitor, in order to better ensure the normal operation of the system, routine cleaning is necessary, and maintenance chemical cleaning can generally be considered every 6 months or more.

Reverse osmosis (RO) membrane cleaning precautions:

1) During normal reverse osmosis cleaning, the pressure of the cleaning system is the best when the system can not produce pure water, and the temperature of the cleaning solution is basically kept at 20-40. The cleaning solution must be prepared with reverse osmosis product water or deionized water, and the liquid must be mixed evenly.

2) During reverse osmosis cleaning, the water stored in the reverse osmosis pressure vessel and pipeline should be discharged, and then the concentrated liquid produced during the cleaning process should be circulated to the cleaning medicine box. If the reflux cleaning solution is visibly discolored or cloudy, the cleaning solution should be reprepared. If the pH of the reflux cleaning solution changes exceeded, the pH should be readjusted or the cleaning solution should be replaced.

3) After cleaning at the specified time, it should be rinsed with reverse osmosis product water or deionized water immediately. The flushing time is generally 30-60 minutes, and the reverse osmosis outlet water is discharged (open the automatic door for producing water and discharging the automatic door for washing concentrated water).

4) Confirm that after the flushing is completed, it is best to put it into normal operation immediately, and the time from chemical cleaning to operation should not exceed 24 hours.

Physical cleaning. Physical cleaning is the use of mechanical scouring to remove the contaminants of the membrane element to restore the performance of the membrane element, such as turbulence, vibration, gas-water mixing, ultrasonic and other physical methods can be used to flush out the pollutants adsorbed on the membrane element.

Chemical cleaning. Chemical cleaning is a cleaning method that uses the corresponding chemical agent to react with contaminants, dissolve them in water, and then discharge them from the membrane element to restore the performance of the membrane element.

The chemical cleaning of RO membrane has very strict requirements for the selection of cleaning agents, first of all, it cannot have any related reaction with the RO membrane elements to be cleaned, and secondly, the selected chemicals can be easily treated and cannot pollute the environment. The commonly used cleaning agents for RO reverse osmosis membranes are divided into acidic cleaning agents (such as phosphoric acid, oxalic acid, citric acid, etc.) and alkaline cleaning agents (sodium hydroxide solution).

Before cleaning the RO reverse osmosis membrane, it is recommended to conduct experimental analysis of the membrane element, and then select the corresponding chemical agent for the cause of contamination. At the same time of cleaning, the flushing method of equal water pressure flushing or reverse flushing should be adopted, which can more effectively remove the contaminants on the surface of the membrane.

Generally, according to the local water quality, it is best to replace and clean once every 6 months!

According to the amount of water consumed, and the quality of the water, there is no fixed time, once the amount of water is found to be smaller, it means that there are more impurities on the film, and it should be replaced in time.

The cleaning time corresponding to different models is also different.

How often do reverse osmosis membranes be replaced? Normally, the replacement time of imported reverse osmosis membrane is about 2-3 years. If it is domestic, it is generally 1-2 years, but in fact, the replacement time may vary due to the difference in water pollution and water consumption in different regions.

In addition, because of the different combinations of water treatment systems, this will also have a certain impact on the replacement time of the reverse osmosis membrane. Users can judge by the amount of water output. If the amount of water output is significantly reduced and the amount of wastewater increases, the reverse osmosis membrane can be replaced.

Why should the reverse osmosis membrane be replaced? Because the membrane pores of the reverse osmosis membrane are very small about microns, due to the size of the membrane pores can filter out most of the impurities in the water, such as viruses, bacteria, heavy metals, etc., some impurities will be discharged with the wastewater, but some will remain on the reverse osmosis membrane and cannot be discharged, so that with the use of time slowly accumulate to form precipitation, at this time, the water yield of the reverse osmosis membrane will be reduced or the quality can not meet the expected standards, etc., and the surface of the reverse osmosis membrane will be covered with impurities after a long time. Filtration is still not restored by cleaning, the filtration effect is still very poor, and the pressure required for the permeate will also increase, which will increase power consumption and lead to higher costs.

According to the local water quality situation, the RO membrane in the general area is used for 2-3 years.

Two or three years, there is it in the manual.

The surface of the reverse osmosis membrane is fouled during operation due to the contamination surface of the substances brought in by the feed water, such as hydrates of metal oxides, calcium precipitates, organic matter and microorganisms. These substances can be cleaned and effectively removed with the help of chemicals under appropriate operating conditions, which is called reverse osmosis membrane cleaning.

Cleaning Flow Rate: For 8in membrane elements, the flow rate is large; 4in membrane element, adopted; Membrane elements, adopted. The pressure of the pressure vessel must be a small pressure to reach the flow rate described above, but the pressure drop through any pressure vessel must not exceed 60 psi.

Membrane elements can be cleaned with anionic surfactants, avoiding the use of cationic surfactants, which can cause irreversible fouling.

Parallel cleaning is allowed, and sectional cleaning is also allowed, and the purpose of sectional cleaning is:

1) Do not cause the flow rate of the section to be too low, and do not cause the flow rate of the latter stage to be too high.

2) Do not cause the sediment of the section to carry over to the next section.

The reverse osmosis membrane will be subject to different degrees of pollution in use, and when the pollution reaches a certain level, the reverse osmosis membrane needs to be cleaned, so how often should it be cleaned, generally it is cleaned once every 3-12 months.

If you use a reverse osmosis membrane that must be cleaned once a month, then this is not normal, and it is time to improve the reverse osmosis system, especially the need to strengthen the pretreatment system and adjust the relevant operating parameters.

For good permeability and desalination properties, the membrane needs to be chemically cleaned. Manufacturers of reverse osmosis equipment recommend cleaning every 3 to 12 months, and if they have to do so every month, it means that the pretreatment system should be improved and operating parameters adjusted. And if it needs to be cleaned once every 1 to 3 months, it is necessary to improve the operating level of the equipment.

The cleaning cycle of the reverse osmosis membrane is based on the actual pollution situation on site.

The normal reverse osmosis cleaning cycle is every 3-12 months.

If it is cleaned more than once in 1 month, it is necessary to improve the pre-treatment, such as additional investment or redesign of the membrane system;

If the RO membrane cleaning cycle is once every 1-3 months, the focus should be on adjusting and optimizing the operating parameters of the existing system.

How often the reverse osmosis membrane is cleaned depends on the actual use, the influent water quality will be different depending on the cleaning cycle, generally speaking, it is normal to clean once every 5 to 12 months. If it must be cleaned once a month, in this case, the pretreatment system should be RO to strengthen the pretreatment of water, if this still can not effectively solve this problem, then it is necessary to replace the reverse osmosis membrane.

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The general service life of the membrane is about 2-3 years, and it will be discarded and replaced after 3 years (the cost of replacing the new membrane and membrane cleaning can be good). When the parameters of your reverse osmosis system change as follows, your system will be cleaned immediately

Pressure difference between the segments of the system: one stage pressure difference; Second-stage differential pressure.

Under the condition that the operating parameters of the system remain unchanged, the water yield of the temperature correction system is restored to more than 85% of the design water yield.

The desalination rate of permeate varies by more than 5%.

PP filtering is set in the front.

BAI device and activated DU carbon filter, etc. Most of the ZIPP filters are 5 microns, and DAO can intercept more than 5um of sediment and particles and other substances. Meltblown filter and wound filter for the first filtration.

The second course uses activated carbon, which has many holes, which can adsorb residual chlorine, odor, heavy metal ions, etc. in the water. The host is very susceptible to oxidation, and if the surface of the reverse osmosis membrane is oxidized, it will lead to a decrease in performance, causing irreversible damage. This is followed by sintering activated carbon, which further adsorbs oxides, which can be called security filters.

It is also the next process and the barrier.