Nanofiltration Membranes


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Nanofiltration Membranes

Nanofiltration (NF), in concept and operation, is much the same as reverse osmosis (RO). The key difference is the degree of removal of monovalent ions such as chlorides. NF removal efficiencies for monovalent ions varies between 50% to 90% depending on the material and manufacture of the membrane, whereas RO can reject monovalent ions at > 99%.

How does Nanofiltration work?

NF membranes are usually classified by their ability to reject divalent ions, e.g. magnesium sulphate at 98%. For this reason, they are sometimes referred to as "softening" membranes due to their ability to reject calcium and magnesium. Removal of sulphate ions from surface water is one of the main areas of use for NF membranes.

NF membranes will also remove bacteria and viruses as well as organic-related color without generating undesirable chlorinated hydrocarbons and trihalomethanes (THM). Because NF operates at a much lower pressure than RO it is, by comparison, a very energy efficient process.

Uses of Nanofiltration

Nanofiltration membranes are also widely used for desalting (i.e. the removal of chloride) of cheese whey and dyestuffs, utilising the the capability of the membranes to pass chlorides to the permeate whilst retaining other fractions (such as dye).

Our Wastewater Treatment Applications

Here at Esmil we provide Wastewater Treatment Applications and product recovery processes across a range of industrial sectors. Our general approach to wastewater treatment will combine conventional physico-chemical treatment processes with advanced proven membrane technology. View our Wastewater Treatment Applications online.

Contact us for our for Nanofiltration Services

For more information regarding Nanofiltration contact our specialists today. Call us direct on 01494 526 155 or fill out our online enquiry form and we'll get back to you.

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