Nano filtration membranes

Basic aspects of NF

Nano filtration (NF) membrane comes under the categorization of RO membrane. RO membrane can be categorized into three groups according to their performances; i.e. salt rejection, permeate flux/permeability and operation pressure. The categorization is as below,

1. Seawater and brackish water desalination membranes operated with 0.5–5 wt% salt solutions at pressures of 10–60 bar

2. Low-pressure nanofiltration membranes operated with 200–5000 ppm salt solutions at pressures of 5–10 bar.

3. Hyperfiltration membranes used to separate solutes from organic solvent solutions.

Further, they are recognized as loose reverse osmosis, low-pressure reverse osmosis, or more commonly, nanofiltration membranes.