Nanofiltration (NF), in concept and operation, is more or less similar to reverse osmosis (RO). The main difference is the percentage of removal of salts & its operating pressure. Nanofiltration (NF) allows the monovalent ions to pass through the membranes such as chlorides. Nanofiltration (NF) removes 40% to 90% of monovalent ions, depending on the material and manufacture of the membrane; whereas RO Membrane, at higher operating pressure, rejects all kind of salts between 95% to 99% depending on the type of salts.

Nanofiltration technology is a crossflow membrane filtration which rejects particles in the approximate size range of 1 nanometer. Nanofiltration (NF) falls between Ultrafiltration (UF) and Reverse Osmosis (RO) Membranes.

Organic molecules with molecular weights greater than 150 daltons are rejected in Nanofiltration (NF). Also, dissolved salts are rejected in the range of 20-98% depending on type and concentration of salts. Typical applications of Nanofiltration (NF) include removal of color, total organic carbon (TOC) & hardness from water. Also, the overall reduction of total dissolved solids (TDS) occurs within the process.

Nanofiltration (NF) is being used for separation of organic & inorganic mixtures. Nanofiltration membranes are also used for desalting or deashing application These membranes allows chlorides to pass through the membrane in permeate and product remain in the concentrate. Nanofiltration (NF) membranes are sometimes referred to as softening membranes due to their ability to reject calcium and magnesium. Nanofiltration (NF) membranes also remove sulphate from the water.

Paramount Limited provides Nanofiltration membrane system. We manufacture skid mounted Nanofiltration membrane systems of all capacity. Paramount offers pilot plan trials to check the suitability of Nanofiltration membrane system for water, wastewater & process applications in all industries. Paramount Limited has installed several Nanofiltration membrane system for Dye desalting & concentration. Using this technology, Paramount Limited has achieved Zero Liquid Discharge in distillery units. It was used for the treatment of spent wash at the outlet of biodigester having COD & BOD as high as 55,000 ppm 8,000 ppm respectively.