Method for treating papermaking waste water,and methods of...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/52 (2006.01) B01D 21/01 (2006.01) C02F 1/56 (2006.01) D21F 1/66 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2557855

A method for treating a papermaking waste water which comprises adding a silica-aluminum based inorganic polymer flocculating agent having a Si/Al molar ratio of 0.2 to 1.5 to a papermaking waste water having a pH of 5 to 14 or a papermaking waste water having been adjusted to have a pH of 5 to 14 in a manner so that the concentration of the above inorganic polymer flocculating agent is 1 to 250 (mg-Al/L) in terms of aluminum, to thereby control the pH of the above papermaking waste water to be 5 to 8, and then adding an organic polymer flocculating agent. The above method for treating a papermaking waste water exhibits high efficiency in the flocculation of a suspended material, and further can carry out a flocculation treatment without the presence of a finely suspended matter and thus allows the reuse of flocculated precipitates as a valuable resource.

Il est prévu un procédé de traitement d'eaux usées de fabrication de papier consistant à ajouter un agent de floculation polymère inorganique à base de silice et d'aluminium d'un rapport molaire Si/Al allant de 0,2 à 1,5 à des eaux usées de fabrication de papier d'un pH de 5 à 14 ou bien à des eaux usées de fabrication de papier ajustées pour avoir un pH de 5 à 14 pour que la concentration de l'agent de floculation polymère inorganique ci-dessus soit de 1 à 250 (mg-Al/L) en termes d'aluminium, pour ainsi contrôler le pH des eaux usées de fabrication de papier ci-dessus dans la fourchette de 5 à 8, avant d'ajouter un agent de floculation polymère organique. Le procédé ci-dessus pour traitement d'eaux usées de fabrication de papier présente une efficacité élevée en matière de floculation d'un matériau en suspension, et peut en outre réaliser un traitement de floculation sans la présence d'une matière finement en suspension, ce qui permet la réutilisation de précipités floculés comme ressource précieuse.

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