Process and apparatus for biological treatment of sludge

Details Process and apparatus for biological treatment of sludge Process and apparatus for biological treatment of sludge

C - Chemistry, Metallurgy

02

F

362/2

C02F 3/28 (2006.01)

Patent

CA 1196738

ABSTRACT OF THE DISCLOSURE Organic sludges are treated biologically by fermentation under acid anaerobic conditions, withdrawing the fermentation liquid and the residual sludge from the fermentation, washing the sludge to remove entrained fermentation liquid, combining the washings with the withdrawn fermentation liquid and subjecting the combined liquid to a digestion. The digested fermentation liquid may be used as the washing liquid. Apparatus for carrying out this process comprises a fermentation reactor, a residual sludge washing tank, a digestion tank, means for conveying the residual sludge to the washing tank, for conveying the fermentation liquid to the digestion tank, for supplying a washing liquid to the washing tank, for withdrawing the washing liquid from the residual sludge and for conveying the washing liquid to the digestion tank. The apparatus may include means for conveying liquid from the digestion tank to the residual sludge washing tank.

420145

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