Chemical and process for cleaning membranes

Details Chemical and process for cleaning membranes Chemical and process for cleaning membranes

B - Operations, Transporting

01

D

B01D 65/06 (2006.01) B01D 65/02 (2006.01)

Patent

CA 2575867

A method for cleaning a microfiltration or ultrafiltration membrane comprising the step of contacting said membrane with a hydroxyl radical. The method is particularly suited for oxidation resistant membranes, such as Halar, with biological or organic fouling. The hydroxyl radicals for example are generated from an aqueous solution of transition metal ions, such as molybdenum, chromium, cobalt, copper, tungsten or more particularly iron, in conjunction with hydrogen peroxide under acidic conditions. The method is particularly suited to hollow fibre membranes where oxygen bubo es foamed in the course of the reaction create a flow that draws more liquid in through a wall of a vertical hollow fibre membrane and pushes water out of the top of the lumen, and where oxygen bubbles act to self agitate the solution which can break up a filter cake, where present, on the microfiltration or ultrafiltration membrane surface.

L~invention concerne une méthode de nettoyage d~une membrane de microfiltration ou d~ultrafiltration comportant une étape consistant à mettre en contact ladite membrane avec un radical hydroxyle. Cette méthode est particulièrement appropriée aux membranes résistant à l~oxydation, telles que Halar, atteintes d~un encrassement biologique ou organique. Les radicaux hydroxyles, par exemple, sont générés à partir d~une solution aqueuse d~ions de métaux de transition, tel que du molybdène, du chrome, du cobalt, du cuivre, du tungstène ou plus particulièrement du fer, en association avec du peroxyde d~hydrogène, dans des conditions acides. Cette méthode est particulièrement appropriée aux membranes à fibres creuses dans lesquelles un bubon d~oxygène apparaît durant la réaction afin de créer un flux qui attire plus de liquide vers l~intérieur à travers la paroi d~une membrane à fibres creuses verticale et repousse l~eau à l~extérieur par le haut de la lumière et dans lesquelles les bulles d~oxygène agissent pour auto-agiter la solution, ce qui peut scinder un gâteau de filtration, lorsqu~il existe, à la surface de la membrane de microfiltration ou d~ultrafiltration.

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