Nanofiltration membrane is a type of membrane found
between ultrafiltration and reverse osmosis membranes. Nanofiltration membranes
are produced to correspond to a molecular weight inhibition limit of
approximately 1-10 nm and are generally used for separation of organic
solutions with low molecular weight such as 200-1000 Da. Since they are
effective in removing multivalent salts, they are also known as partial
demineralization process. They can retain dissolved salts, low molecular weight
organic substances and organic dyes that UF membranes cannot. However, the
removal efficiency is lower than reverse osmosis membranes.
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