Method of dewatering sludge

Details Method of dewatering sludge Method of dewatering sludge

C - Chemistry, Metallurgy

02

F

C02F 11/12 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2086715

Abstract of the Invention In a method of dewatering sludge wastes discharged from a factory such as pulp factory, sludge wastes are first dewatered by a preliminary dewatering device such as a pre-thickener of a rotary screen type, a sludge discharged from the preliminary de- watering device is then supplied to a main dewatering device such as a screw press. Waste liquids dis- charged from the preliminary and main dewatering devices are supplied to an agglutinating reaction tank together with a macromolecular agglutinating reagent and agglutinated substances in the aggluti- nating reaction tank are treated by the main dewater- ing device. The agglutinated substances formed on the bottom surface of the agglutinating reaction tank may be treated by a different main dewatering device than said main dewatering device. A necessary amount of the macromolecular agglutinating reagent to he supplied to the agglutinating reaction tank can be reduced, while the dewatering efficiency is not deteriorated.

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