Nanofiltration is also known as “loose” RO and can reject particles smaller than 0,001 µm. Nanofiltration is used for the removal of selected dissolved constituents from wastewater. NF is primarily developed as a membrane softening process which offers an alternative to chemical softening.
Likewise, nanofiltration can be used as a pre-treatment before directed reverse osmosis. The main objectives of NF pre-treatment are:
(1). minimize particulate and microbial fouling of the RO membranes by removal of turbidity and bacteria,
(2) prevent scaling by removal of the hardness ions,
(3) lower the operating pressure of the RO process by reducing the feed-water total dissolved solids (TDS) concentration.
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