Treatment of sewage sludge

Details Treatment of sewage sludge Treatment of sewage sludge

C - Chemistry, Metallurgy

02

F

C02F 11/14 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2349803

A method for reducing sludge viscosity of a sewage sludge having a solids concentration of at least 10% (w/w). The method comprises the steps of increasing the pH of the sludge to 9.5-12.5%, at least one step selected from subjecting the sludge to a holding step of at least one day and adding inorganic or organic chemicals to facilitate viscosity reduction, followed by incubating the sludge at temperature up to 100°C, and subjecting the sludge to a shearing or disintegration step. The method provides sludge, especially concentrated sludge, that is more readily pumped or transported.

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