A Primer on Different Membrane Types
By David Paul
T his month ULTRAPURE WATER is focused on ﾓmembranesﾔ. In this article, a general overview of pressure-driven membrane technologies is presented. Pressure-driven membrane water treatment technologies are as follows: Microfiltration (MF) Ultrafiltration (UF) Nanofiltration (NF) Hyperfiltration (HF) MF and UF membranes are used to remove particulate contaminants from a water stream. The use of MF and UF membranes in water treatment is called membrane filtration. NF and HF membranes are used to remove dissolved contaminants from a water stream. The use of NF and HF membranes in water treatment is called reverse osmosis (RO). In the United States, the term HF is not commonly used. It is more common to use NF and RO to designate the two categories of membranes used to remove dissolved contaminants.
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