ABSTRACT
Plant tours and inspections of the Chitungwiza, Firle and Crow borough plants were conducted, and an understanding of the plant designs as well as the current process flow was attained. Municipal sewage sludge biogas plants can be seriously considered for implementation at the Chitungwiza, Firle and Crow borough municipal sewage plants in Harare, Zimbabwe. The natural anaerobic degradation of municipal sewage sludge in a digester follows a similar pathway to the one that takes place in any anaerobic digester with a net production of biogas. Agitation is essential in biogas production as it increases the contact between the Hycura and the sewage sludge. The recovery of the clean effluent, biogas and biosolids in the municipal sewage plants will change the situation by eliminating many negative environmental impacts and also provide a renewable source of energy that can be used to provide power in the plants.
