Cleaning agent for separation membrane, process for...

B - Operations – Transporting – 01 – D

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B01D 65/06 (2006.01) C11D 7/18 (2006.01) C11D 7/26 (2006.01) C11D 17/08 (2006.01)

Patent

CA 2682711

An economically advantageous, safe washing agent for separation membrane that in the washing of separation membranes used in the filtration of public supply water, industrial water, stream water, lake water, groundwater, impounded water, sewage water after secondary treatment, sewage water, wastewater, etc., exhibits washing effects equivalent to or higher than those attained by conventional washing methods, and that does not contain hypochlorites to thereby be free from harmful gas emission or other adverse effects on human body, and that avoids a rinse step involving washing with a large volume of water to thereby shorten the washing time. The washing agent comprises hydrogen peroxide, a heavy metal compound and a hydroxydicarboxylic acid. Preferably, the hydroxydicarboxylic acid is selected from the group consisting of malic acid, tartaric acid, tartronic acid, citramalic acid, dioxymaleic acid and dioxymalonic acid, and the heavy metal compound is an iron ion.

L'invention porte sur un agent de lavage sans danger, économiquement avantageux, pour une membrane de séparation, qui, dans le lavage de membranes de séparation utilisées dans la filtration des eaux des services publics, des eaux industrielles, des eaux de cours d'eau, des eaux de lacs, des eaux des nappes phréatiques, l'eau close, les eaux d'égouts après traitement secondaire, les eaux d'égouts, les eaux usées, etc., présente des effets lavants équivalents ou supérieurs à ceux atteints par les procédés de lavage classiques, et qui ne contient pas d'hypochlorites pour être ainsi exempt d'émissions de gaz nocifs ou autres effets défavorables sur le corps humain, et qui évite une étape de rinçage mettant en jeu un lavage avec un grand volume d'eau, permettant ainsi de raccourcir le temps de lavage. L'agent de lavage comprend du peroxyde d'hydrogène, un composé de métal lourd et un acide hydroxydicarboxylique. De préférence, l'acide hydroxydicarboxylique est choisi dans le groupe constitué par l'acide malique, l'acide tartrique, l'acide tartronique, l'acide citramalique, l'acide dioxymaléique et l'acide dioxymalonique, et le composé de métal lourd est un ion fer.

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