Microporous filter media, filtration systems containing...

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 61/00 (2006.01) A01N 25/26 (2006.01) A61L 2/00 (2006.01) A61L 2/02 (2006.01) A61L 9/16 (2006.01) B01D 29/15 (2006.01) B01D 37/02 (2006.01) B01D 39/16 (2006.01) B01D 39/18 (2006.01) B01D 39/20 (2006.01) B01D 63/00 (2006.01) B01J 20/28 (2006.01) B01J 20/32 (2006.01) C02F 1/00 (2006.01) C02F 1/44 (2006.01) C02F 1/50 (2006.01) C12H 1/044 (2006.01) C12H 1/056 (2006.01) F24F 3/16 (2006.01) C02F 1/28 (2006.01) C02F 1/42 (2006.01) C02F 1/76 (2006.01)

Patent

CA 2474858

The invention is directed to a microbiological interception enhanced filter medium, preferably having an adsorbent prefilter located upstream from the filter medium. Preferably, the prefilter is adapted to remove natural organic matter in an influent prior to the influent contacting themicrobiological interception enhanced filter medium, thereby preventing loss of charge on the filter medium. The microbiological interception enhanced filter medium is most preferably comprised of fibrillated cellulose nanofibers, in particular, lyocell nanofibers. At least a portion of the surface of the at least some of the nanofibers have formed thereon a microbiological interception enhancing agent comprising a cationic metal complex. A filter medium of the present invention provides greater than about 4 log viral interception, and greater than about 6 log bacterial interception.

L'invention concerne un matériau filtrant présentant une interception microbiologique améliorée; de préférence, ce matériau filtrant est doté d'un préfiltre adsorbant qui est situé en amont du matériau filtrant. De préférence, le préfiltre est conçu pour éliminer la matière organique naturelle contenue dans un liquide entrant avant que ce dernier n'entre en contact avec le matériau filtrant à interception microbiologique améliorée. Ce matériau filtrant est, de préférence, constitué de nanofibres de cellulose fibrillées, plus particulièrement, de nanofibres Lyocell. Au moins une partie de la surface d'au moins certaines des nanofibres présente un agent conçu pour améliorer l'interception microbiologique, lequel agent contient un complexe métallique cationique. Le matériau filtrant, tel qu'il est défini dans cette invention, permet d'obtenir une interception virale supérieure à environ 4 log et une interception bactérienne supérieure à environ 6 log.

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