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water nanofiltration
http://www.lenntech.com/nanofiltration-and-rosmosis.htm

Nano filtration is a technique that has prospered over the past few years. Today, nano filtration is mainly applied in drinking water purification process steps, such as water softening, decolouring and micro pollutant removal.
During industrial processes nano filtration is applied for the removal of specific components, such as colouring agents.
Nano filtration is a pressure related process, during which separation takes place, based on molecule size. Membranes bring about the separation. The technique is mainly applied for the removal of organic substances, such as micro pollutants and multivalent ions. Nano filtration membranes have a moderate retention for univalent salts.

Company
Lenntech water treatment
Rotterdamseweg 402m
2629HH Delft (Netherlands)
Homepage: http://www.lenntech.com