Patent ID: 6733673
Filing Date: 2004-05-11
Classification: C02F

Abstract:
A method of dewatering sludge comprising sequentiallyi) adding an effective amount of a cellulolytic enzyme preparation having only endoglucanase activity to the sludge; ii) adding an effective amount of an aqueous solution of one or more peroxidases and hydrogen peroxide to the sludge; iii) adding to the sludge an effective amount of one or more floccolants selected from copolymers and terpolymers of (meth)acrylamide with dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate or their quaternary ammonium forms made with dimethyl sulfate, methyl chloride or benzyl chloride, the flocculants having a molecular weight in excess of one million to form a mixture of water and coagulated and flocculated solids and separating the coagulated and flocculated solids from the water.