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Nanofiltration (NF) is a membrane filtration technology which ranges somewhere between ultrafiltration (UF) and reverse osmosis (RO). The nominal pore size is typically below 1nm, thus Nanofiltration. Nanofilter membranes are typically rated by molecular weight cut-off (MWCO) rather than nominal pore size.

The transmembrane pressure (pressure drop across the membrane) required is considerably lower than those used for RO, reducing the operating cost significantly. However, NF membranes are still subject to scaling and fouling and often modifiers such as anti-scalants are required for use.

See for more information.

See for a definition of MWCO.

See for the industry-standard filtration spectrum including MF, UF, NF and RO. (talk) 20:56, 18 March 2009 (UTC)dB333

I moved the above pertinent information to a new section named "Principle". I have modified the membrane link to point to cross-flow filtration instead. Myops (talk) 00:27, 30 October 2009 (UTC)

Came across the site where the information missing citation is from. Too busy to change it now. Will come back later if I remember. (talk) 04:07, 26 November 2010 (UTC)

Merge proposal[edit]

This article seems to discuss the same subject as nanotechnology in water treatment (a new article). I could be wrong. I propose merging that article into this one. Equazcion (talk) 04:07, 12 Feb 2010 (UTC)

Recommend against merging; it is not the same. — Preceding unsigned comment added by MikeChE (talkcontribs) 01:08, 22 January 2011 (UTC)

Recommend also against: nanotechnology in water treatment could also be nanoparticulate catalysts such as nano zero valent iron or nano-TiO2 or nanosorbents such as iron oxide. nanofiltration is (if we even consider nanofiltration to be a nanotechnology) one option for the treatment of water —Preceding unsigned comment added by (talk) 08:58, 27 April 2011 (UTC)