Chemical cleaning agent and process for cleaning filtration...

Details Chemical cleaning agent and process for cleaning filtration... Chemical cleaning agent and process for cleaning filtration...

B - Operations, Transporting

01

D

B01D 65/06 (2006.01)

Patent

CA 2620811

Methods for cleaning a membrane, such a porous polymeric ultrafiltration or microfÊltration membranes (eg PVdF or Halar) , comprising contacting the membrane with an aqueous solution comprising a monopersulfate anion. Buffers, chelating agents, catalysts, and combinations thereof can be added. The monopersulfate anion is most advantageously in the form of a potassium triple salt Of H2SO5, HSO5 -, SO5 2- . Solutions comprising monopersulfate anions can be fed into a feed side of the membrane and the membrane is allowed to stand and soak in the solution or injected to the filtrate side prior to a membrane backwash. An aeration step and/or irradiation with ultraviolet light can be used.

L~invention concerne des procédés de nettoyage d~une membrane, telle qu'une membrane polymérique poreuse d'ultrafiltration ou de microfiltration (par exemple PVdF ou Halar), lesdits procédés comprenant la mise en contact de la membrane avec une solution aqueuse comprenant un anion monopersulfate. Des solutions tampons, des agents chélatants, des catalyseurs, et des combinaisons de ces composés peuvent être ajoutés. Selon le mode de réalisation le plus avantageux, l~anion monopersulfate est sous la forme d~un sel triple de potassium de H2SO5, HSO5 -, SO5 2-. Les solutions comprenant les anions monopersulfate peuvent être introduites du côté de l~alimentation de la membrane et la membrane est alors laissée au repos à tremper dans la solution, ou les solutions peuvent être injectées du côté du filtrat avant un lavage à contre-courant de la membrane. Une étape d~aération et/ou d~irradiation par de la lumière ultraviolette peut être utilisée.

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