Microporous filter system and process

Details Microporous filter system and process Microporous filter system and process

B - Operations, Transporting

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B01D 39/16 (2006.01) A61L 2/00 (2006.01) A61L 2/02 (2006.01) B01D 61/14 (2006.01) B01D 69/12 (2006.01) B01D 71/56 (2006.01) C02F 1/28 (2006.01)

Patent

CA 1209057

Abstract: A microporous filter system comprises two types of hydrophilic, microporous filter media operating in series. The two filter media have opposite zeta potentials with the upstream or first filter medium preferably having the positive zeta potential and the downstream or second filter having the negative zeta potential. The first filter medium typically has an absolute pore rating of from about 0.1 to about 1.0 micrometer and the second or downstream filter medium typically has an absolute pore rating of from about 0.02 to about 0.1 micrometer. The downstream or second filter has a finer absolute pore rating than the upstream or first filter. Fluids contaminated with ultrafine particles can be purified with an essentially absolute efficiency to remove 99.99 per- cent or more of the particulate matter in the con- taminated fluid. The filter system finds particular use in the preparation of ultrapure effluent water of near theoretical resistivity and in the removal of bacteria and endotoxins to form sterile fluids.

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