Dewatering of sludges deriving from paper industry

Details Dewatering of sludges deriving from paper industry Dewatering of sludges deriving from paper industry

C - Chemistry, Metallurgy

02

F

C02F 11/14 (2006.01)

Patent

CA 2315807

A sludge, preferably derived at least in part from a paper mill, pulp mill or deinking plant, and which contains at least secondary sludge or primary sludge comprising deinking waste, recycled paper waste or mechanical pulping waste, is flocculated by being mixed with a phenolic material and a polyalkylene oxide and is then subjected to dewatering.

Selon l'invention, de la boue, provenant de préférence, au moins en partie, d'une fabrique de papier, d'une usine de pâte à papier ou d'une installation de désencrage, qui contient au moins une boue secondaire ou une boue primaire contenant des déchets de désencrage, des déchets de papier recyclé ou des déchets de pâte mécanique, est soumise à une floculation par mélange avec une substance phénolique et avec un polyoxyde alkylène, puis soumise à une déshydratation.

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