Bacteriological analysis of stored aerobic sewage sludge cake

Abstract

A 4 t heap of aerobic sewage cake was stored exposed to the weather in a temperate maritime climate and examined over a period of 60 weeks. Salmonellae were not isolated after 11 weeks storage. Coliforms and faecal streptococci were not isolated from surface samples after 23 and 46 weeks, respectively, but were both isolated from the interior for 60 weeks.