Nano filtration (NF) technology is used when reverse osmosis with a specific membrane pore diameter and ultrafiltration are not suitable for separation. Where other alternatives are not appropriate, Nano filtration can be used instead of demineralization, color removal, COD removal, waste water recovery and desalination. Suspended solids and polyvalent ions are removed in the organic solutions. Permeate remains monovalent ions and low molecular weight solutes such as alcohol.
The Nano filtration-membrane pore size is 0.001 microns and the applied pressure is higher. In this system, all bacteria, viruses and cysts can be removed. At the same time NF also distinguishes alkalinity from water. The water thus obtained may be corrosive. NF membranes are also known as softening membranes because NF also separates water-hardening minerals.
