Cleaning method for simple filtration systems

B - Operations – Transporting – 01 – D

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B01D 65/02 (2006.01) B01D 65/08 (2006.01)

Patent

CA 2689406

A method of cleaning a permeable, hollow membrane (6) in an arrangement of the type wherein a pressure differential is applied across the wall of the permeable, hollow membrane (6) immersed in a liquid suspension provided in a vessel (5), said liquid suspension being applied to the outer surface of the permeable hollow membrane (6) to induce and sustain filtration through the membrane wall. The method of cleaning comprising the steps of: suspending the filtration process; while continuing to supply the liquid suspension to the vessel (5); aerating the membrane (6) by flowing gas into the vessel (5) to produce a flow of gas bubbles around the membrane (6) to dislodge at least some of the retained particulate material from the membrane surface; removing liquid containing dislodged particulate material from the vessel (5) during the aerating step and recommencing the filtration process.

L'invention concerne un procédé de nettoyage d'une membrane creuse, perméable (6) dans un agencement du type de ceux dans lesquels un différentiel de pression est appliqué à travers la paroi de la membrane creuse, perméable (6) immergée dans une suspension liquide disposée dans un récipient (5), ladite suspension liquide étant appliquée à la surface externe de la membrane creuse perméable (6) pour induire et entretenir une filtration à travers la paroi de la membrane. Le procédé de nettoyage comprend les étapes consistant à suspendre le procédé de filtration tout en continuant à adresser la suspension liquide au récipient (5) ; aérer la membrane (6) en faisant s'écouler un gaz dans le récipient (5) pour produire un écoulement de bulles de gaz autour de la membrane (6) pour déloger au moins une partie du matériau particulaire retenu à partir de la surface de membrane ; éliminer le liquide contenant le matériau particulaire délogé à partir du récipient (5) pendant l'étape d'aération et recommencer le procédé de filtration.

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