Process for the disinfection of sewage sludge

Details Process for the disinfection of sewage sludge Process for the disinfection of sewage sludge

C - Chemistry, Metallurgy

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C02F 11/02 (2006.01) C02F 1/02 (2006.01) C02F 3/12 (2006.01) C02F 3/30 (2006.01) C02F 11/04 (2006.01) C02F 11/18 (2006.01)

Patent

CA 1330239

PROCESS FOR THE DISINFECTION OF SEWAGE SLUDGE Abstract of the Disclosure The process for the disinfection of sewage sludge prior to introducing same into an anaerobic sewage sludge processing step involving the recovery of methane gas by heating the sewage sludge in a preceding disinfection step at from 50 °c to 70 °C, and prefer- ably at from 55 °C to 65 °C, for a period of from 1 to 72 hours, and preferably of from 12 to 36 hours, while thoroughly mixing the sewage sludge with an oxygen- containing gas is carried out by using, as the oxgen- containing gas, a mixture comprising from 10 to 70% by volume of fresh air and 30 to 90% by volume of vent gas from the disinfection step, the oxygen contents of the gas mixture being maintained within the range of from 5 to 15% by volume, and preferably of from 7 to 12% by volume.

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