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Nanofiltration follows a concept similar to reverse osmosis. The main difference lies on the size of the pores, with nanofiltration membranes having 0.01 to 0.001 micron-pores while that of reverse osmosis membranes having 0.001 to 0.0001 micron-pores. In application, nanofiltration is used to remove hardness and organic pollutants in water.

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This can be done when looking at treating water with low value salts. Nanofiltration can be used to treat brackish water with the retentate having lower concentrations compared to those from RO systems. Additionally, it can also handle high amount... (More)

(1) Pressure - Increase in feed pressure results in decrease in permeate TDS and increase in permeate flux
(2) Temperature - Increase in temperature results in increase in permeate flux and salt passage
(3) Recovery - Increase in recovery results... (More)

Mark HuddAquaQuote Team
AquaQuote Community Liaison | SEO Creative Content Marketer | Former Water Operator

Nanofiltration has a pore size of around 0.1 micron. It will remove most organic molecules, almost all viruses, and some salts, such as divalent hard water ions, meaning it can be used to soften water.

Reverse osmosis membranes have a... (More)

Similar to reverse osmosis systems, general periodic cleaning is recommended for nanofiltration membranes. However, when changes in parameters like the following are observed, it is recommended to conduct membrane cleaning, even before the set schedule:

(1) Design permeate flow and/or... (More)