Improved membrane system backwash energy efficiency

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 35/22 (2006.01)

Patent

CA 2734796

A method of backwashing a membrane filtration system comprising at least one permeable membrane, preferably a hollow fibre membrane, the method comprising the step of applying a pressurised gas at a variable pressure to permeate remaining present in the system when filtration process is stopped or suspended to provide liquid for backwashing pores of the permeable membrane during a backwashing process. Also provided are methods of filtering solids from a liquid suspension using alternating liquid backwash pressures.

L'invention porte sur un procédé de lavage à contre-courant d'un système de filtration à membrane comprenant au moins une membrane perméable, de préférence une membrane à fibres creuses. Le procédé comprend l'étape d'application d'un gaz pressurisé à une pression variable au perméat restant présent dans le système lorsque le procédé de filtration est arrêté ou suspendu pour fournir un liquide de lavage à contre-courant des pores de la membrane perméable durant un procédé de lavage à contre-courant. L'invention porte également sur des procédés de filtration de matières solides à partir d'une suspension liquide à l'aide de pressions alternées de lavage à contre-courant de liquide.

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