How should RO membranes in seawater desalination equipment be maintained?

Author: Hou

Sep. 23, 2022


Seawater contains a lot of impurities. As the main filter element of seawater desalination technology, RO membrane cannot avoid regular cleaning. Since the pore size of the RO membrane is one millionth of the hair (0.0001 micron), it is generally invisible to the naked eye, and bacteria and viruses are 5,000 times larger than it. Therefore, only water molecules and some mineral ions can pass through, other impurities and Heavy metals are discharged from the waste water pipe. All seawater desalination processes and astronaut wastewater recycling use this method, so RO membranes are also called high-tech "artificial kidneys" in vitro. At home and abroad, in the fields of medicine, military and civilian use, top RO membranes are used for polymer filtration.

However, after the Seawater Desalination RO membrane operates normally for a period of time, the membrane elements will be polluted by suspended or insoluble substances that may exist in the feed water. When system performance drops by 10% under standard conditions, or when scaling or fouling is evident, it should be cleaned in time. Regular water flushing and chemical dosing cleaning can restore the performance of membrane elements and prolong the service life of membrane elements


After a certain period of use, because the impurities in the water will remain on the surface of the membrane, causing pollution, it needs to be replaced. In general, the SW RO membrane in seawater desalination equipment is generally replaced once every 1-2 years. However, the specific situation also needs to be determined according to the water quality of the produced water. During the specified service period, the water quality of the seawater desalination equipment has not changed, and it does not need to be replaced if it can meet the water requirements. On the contrary, the water quality needs to be replaced immediately. . RO membrane cleaning is usually performed by washing with RO reverse osmosis product water, pre-soaking with cleaning liquid, stage cleaning and forward flow cleaning, and two special methods are reverse flow cleaning and air drainage and re-flushing.

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About the cleaning and replacement of SWRO membrane of seawater desalination equipment, I will introduce it here today. I hope it will be helpful to everyone. If you want the SWRO membrane of seawater desalination equipment to be used for a longer time, the first thing to do is to do a good job of pretreatment, and then often Maintenance is very helpful for prolonging the service life.

UltraClean Membrane CO.,Ltd. supply Seawater Desalination RO Membrane, Reverse Osmosis Membrane Elements, we have a whole set of quality management system. If you have interested in our products, pls feel free to contact us.

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