A method of cross-flow filtration and a cross-flow...

B - Operations – Transporting – 01 – D

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Details

B01D 65/02 (2006.01) B01D 61/14 (2006.01) B01D 61/20 (2006.01) B01D 61/22 (2006.01) C12H 1/16 (2006.01)

Patent

CA 2378335

A method and an apparatus for cross-flow filtration of a fluid utilizing a porous membrane (2) arranged in a housing (1) having a feed inlet (3) and a retentate outlet (4) as well as a permeate outlet (5) and a retentate inlet (6), hydrophores (17 and 19) being arranged proximate the feed inlet (3) and the retentate outlet (4), respectively, for facilitating the flow of retentate during backwashing away and along the membrane (2), the backwashing being achieved by means of a hydrophore (21) and an on/off valve (23) and a constant flow pump (24) such that a positive backwashing transmembrane pressure over the membrane (2) between the permeate and the retentate side of said membrane may be maintained during a majority of the period of time in which the intermittent backwashing takes place.

La présente invention concerne un procédé et un appareil permettant la filtration à contre courant d'un liquide, qui utilise une membrane poreuse (2) agencée dans un logement (1) possédant un orifice d'alimentation (3) et un orifice de sortie (4) de retentat, un orifice de sortie (5) d'ultrafiltrat et un orifice d'entrée (6) de retentat. Des hydrophores (17, 19) sont agencés près de l'orifice d'alimentation (3) et de l'orifice de sortie (4) de retentat, respectivement, de façon à faciliter l'écoulement du retentat au cours du lavage à contre courant le long de la membrane (2). Ce lavage à contre courant étant achevé au moyen d'un hydrophore (21), d'une vanne O/F (23) et d'une pompe à débit constant (24), de sorte qu'une pression positive transmembranaire de lavage à contre courant exercée sur la membrane (2) située entre le côté ultrafiltrat et le côté retentat de cette membrane, puisse être maintenue durant la plus grande partie du temps dévolu au lavage à contre courant intermittent.

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