Dewatering of sewage sludges on filter presses

Details Dewatering of sewage sludges on filter presses Dewatering of sewage sludges on filter presses

C - Chemistry, Metallurgy

02

F

362/2

C02F 11/14 (2006.01) B01D 37/00 (2006.01) B01D 37/03 (2006.01) C02F 11/12 (2006.01)

Patent

CA 1172390

Abstract of the Disclosure: A process for dewatering sewage sludges by mixing these homogeneously with additives, such as finely divided coal or ash or mixtures thereof, adding organic flocculants, removing the greater part of the water, in a first dewatering step, by gravity filtration without applying a pressure differential and then dewatering more thoroughly in a second dewatering step, by pressure filtration on filter presses, wherein the additives, such as finely divided coal or ash or mix- tures thereof, are added in an amount of from 0.5 to 1.5 parts by weight per part by weight of sludge solids and from 1 to 7 kg of organic flocculant/tonne of sludge solids is added to the sewage sludges before or during admixture of the additives.

390301

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