Nanofiltration - Reverse Osmosis Systems Print E-mail

Nanofiltration - Nanofiltration is a process similar to reverse osmosis but it is less effective at removing dissolved solids. Nanofilters are commonly referred to as membrane softeners because they will usually reject the double-positively charged hardness ions (i.e. calcium and magnesium) fairly well but cannot reject the single-positive charged soft ions (e.g.,sodium and  potassium).

Nanofilters are most commonly used in the drinking water industry where the dissolved solids must be reduced to below 500 mg/L (Safe Drinking Water Act). The choice between nanofiltration in these applications comes down to economics. Nanofilters require less pumping pressure but would require a greater percentage of the total flow compared to reverse osmosis systems which require greater feed water pressure but could be blended with the raw water due to the lower TDS level of the RO permeate.

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Reverse Osmosis Chemicals International work closely with a diverse range of global organisations, intelligently combining advanced treatment technologies with practical solutions to resolve complex issues. If you have a project you would like to discuss, or you require technical support and assistance; or if you simply have a question about our reverse osmosis technology solutions please contact one of our specialist advisors using our Technical Support page or call us on +44 (0) 330 223 31 31.