Abstract: There is disclosed a process for treating sewage or similar organic sludge to produce a pasteurized and dried product comprising the steps of: drying the sludge to substantially the desired dry solids content of the product; and thereafter adding an alkaline admixture to the dried sludge in order to pasteurize and/or stabilize the sludge and thereby produce the product without employing subsequent drying by aeration.

Abstract: There is disclosed a process for treating sewage or similar organic sludge to produce a pasteurized and dried product comprising the steps of: dividing the sludge into at least one first portion and at least one second portion; drying the first portion so that the first portion has a higher dry solids content than that of the second portion; mixing the fist portion and the second portion to produce a mixture having a dry solids content which is intermediate between that of the first and second portions; adding an alkaline admixture to the mixture in order to pasteurize the mixture and thereby produce the product without employing subsequent drying by aeration.

Abstract: There is disclosed a process for treating sewage sludge or similar organic sludge in which dewatered sludge cake and an alkaline admixture are mixed and then dried under pasteurization conditions utilizing heat from the exothermic reaction with the alkali, in which drying is effected by extraction of moisture evaporated from the mixture by the exothermic heat.