Process for treating organic material

Details Process for treating organic material Process for treating organic material

C - Chemistry, Metallurgy

05

F

21/16, 71/18

C05F 7/00 (2006.01) A61L 11/00 (2006.01) C02F 11/00 (2006.01)

Patent

CA 1337457

A process for sterilizing and disinfecting sewage sludge comprises, in sequential order, admixing raw, activated or digested sewage sludge with anhydrous ammonia gas; adding a sufficient quantity of the anhydrous ammonia gas to increase the pH of the sludge to about 11.6 and the temperature of the sludge by between 30C and 60C, and admixing an inorganic acid with the sewage sludge-ammonia admixture in an amount sufficient to substantially neutralize the sewage sludge-ammonia admixture to a pH of about 7. The temperature of the admixture is thereby increased to at least 65C, with the temperature not exceeding 130C at a pressure of 1-3 bar(g). A substantially sterilized, disinfected sludge is obtained.

608142

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