Nanofiltration is a technique used to separate components contained in a liquid. Semi-permeable membranes with a pore diameter between 0.001 and 0.01 micrometers are used.
This technique removes colouring agents, polyvalent ions (heavy metals), organic micropollutants (pesticides), and nitrates. Nanofiltration is therefore used in depollution processes, and also for softening and decolourisingwater.
Nanofiltration membrane for a desalination plant. © Roplant CC by-nc-nd 2.0