Reverse osmosis membrane pollution and cleaning method

    The reverse osmosis membrane is an artificial semi-permeable membrane made of a semi-permeable membrane that has certain characteristics and is a core component of reverse osmosis technology. In the process of using reverse osmosis membrane pollution, what are the pollutants of the reverse osmosis membrane element? How should it be removed? Let me introduce you below.
1. Contaminants of reverse osmosis membrane components
    After a period of normal operation, the reverse osmosis membrane element may be contaminated by suspended matter or poorly soluble substances that may be present in the feed water. The most common of these pollutants are calcium carbonate scale, calcium sulfate scale, metal oxide scale, and silicon. Sediments and organic or inorganic deposits.
    The nature of the pollutants and the rate of contamination are related to the water supply conditions. The pollution is slowly developed. If the measures are not taken at an early stage, the pollution will damage the performance of the membrane elements in a relatively short period of time.
    Regular testing of the overall performance of the system is a good way to confirm contamination of the membrane components. Different contaminants can cause varying degrees of damage to the performance of the membrane components. Table 1 lists the effects of common contaminants on membrane performance.
2. Removal of pollutants
    Contaminant removal can be achieved by chemical cleaning and physical rinsing, sometimes by changing operating conditions. As a general rule, cleaning should occur when one of the following conditions occurs.
1 Under normal pressure, if the product water flow drops to 10-15% of the normal value.
2 In order to maintain normal product water flow, the temperature-corrected feed water pressure is increased by 10 to 15%.
3 product water quality reduced by 10 to 15%, salt transmission rate increased by 10 to 15%.
4 use pressure increased by 10 to 15%.
    The pressure difference between the 5RO sections increased significantly (perhaps no instrument to monitor this indication).
    The above is about the pollutants in the reverse osmosis membrane element and the way to remove it. I hope it can help everyone.
Modified on 2019.4.12


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