Enhanced removal of hydrophobic contaminants from water...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 5/02 (2006.01) C02F 1/56 (2006.01) C02F 9/00 (2006.01) D21C 9/08 (2006.01)

Patent

CA 2213367

The present invention provides a method for removing secondary fiber contaminants from paper mill process waters comprising adding a polyvinyl chloride, a cationic polymeric coagulant and a polymeric flocculant to paper mill process waters containing secondary fiber contaminants in an amount sufficient to agglomerate the secondary fiber contaminants to larger particles sizes, and removing the secondary fiber contaminants from the process water by a dissolved air flotation clarification technique. The addition of particulate polyvinyl chloride in combination with a polymeric coagulant and flocculant prior to the DAF clarification process causes the contaminants to become preferentially coated with the polyvinyl chloride particles. This coating is what causes the subsequent removal of the secondary fiber contaminants in the DAF clarification process to be more effective.

La présente invention décrit une méthode pour éliminer les contaminants secondaires des fibres des eaux de fabrication des usines de papier comprenant l'addition d'un poly(chlorure de vinyle), d'un coagulant cationique polymérique et d'un floculant polymérique aux eaux de fabrication des usines de papier contenant des contaminants secondaires des fibres dans une quantité suffisante pour agglomérer les contaminants secondaires des fibres en particules de taille plus grande, et l'élimination des contaminants secondaires des fibres des eaux de fabrication par une technique de clarification par flottation à l'air dissous (FAD). L'addition de poly(chlorure de vinyle) particulaire en combinaison avec un coagulant et un floculant polymériques avant la réalisation de clarification par FAD a pour effet que les contaminants s'enduisent préférentiellement de particules de poly(chlorure de vinyle). C'est ce revêtement qui rend plus efficace l'élimination subséquente des contaminants secondaires des fibres au cours du procédé de clarification par FAD.

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