How to use reverse osmosis membrane correctly?

Membrane element storage

Before the membrane element is put into the pressure vessel, do not open the sealed package, store it in a cool and dry place, avoid direct sunlight.
Not subject to freezing ice.

Membrane element installation

Before installing the membrane element, make sure that the system has been cleaned.
When the membrane element is installed in the system, the O-ring and the concentrated water sealing ring should be properly lubricated. Silicone-based rubber or 50% glycerin aqueous solution can be used. Oil, grease, petroleum jelly or petroleum compounds are prohibited.
When the membrane elements are loaded into the pressure vessel one by one, the gap is eliminated by adding gaskets at the end plate of the pressure vessel to prevent the membrane elements from jumping in the pressure vessel when the system is started and stopped, and at the same time, the external connection of the membrane elements can be reduced. possibility of leakage.

Rinsing of the new membrane

The new system should be thoroughly rinsed after installing the membrane element to completely clean the residual impurities, solvent and protective liquid in the system.
When the produced water is used for drinking, it needs to be rinsed for at least 24 hours.

System startup and operation

Before the system is started, the concentrate valve should be kept fully open. After the system is started, the concentrated water valve can be closed gradually and slowly, so that the system can reach the set recovery rate. It is strictly forbidden to start the equipment when the concentrate valve is closed.
During the operation of the system, at any time (including system pre-start, normal operation, flushing and chemical cleaning), do not close the valve on the permeate pipeline.
Before high-pressure operation, perform low-pressure flushing through soft-start mechanism or variable frequency speed regulation to discharge air.

Pay attention

Ensure that the turbidity of the feed water is <1.0 NTU or SDI15<5, the temperature of the feed water is <45°C, and the influent water does not contain harmful substances that may cause physical and chemical damage to the membrane.
At any time, the residual chlorine content in the influent water of the membrane element shall not exceed 0.05mg/L, otherwise it will cause irreversible oxidative damage to the membrane element.

Maintenance

After a period of normal operation, the membrane element 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 the membrane element and prolong the service life of the membrane element.
During the short-term shutdown of the system, the system should be flushed every 5 days, and the valve should be closed after flushing.
If the system is out of operation for a long time (more than 30 days), add 1% sodium bisulfite solution to prevent bacterial reproduction.

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