By pore size there are four classes: microfiltration (0.1–1 µm), ultrafiltration (0.01 µm), nanofiltration (~0.001 µm) and reverse osmosis (~0.0001 µm). Common materials are polysulfone and PVDF (UF) and polyamide TFC (RO/NF). The factors that determine membrane life are the quality of pretreatment, contact with chlorine, and the control of scaling and biofouling.
Technical glossary· Membrane technologies
Membrane
Short definitionA selectively permeable thin barrier that blocks particles or ions above a certain size in water treatment.
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