Domestic solid waste and sewage improvement by anaerobic digestion: a stirred digester

The processing of the mixture of domestic solid waste and domestic sewage in an stirring digester was studied. The experimental set up consisted of six thermostatically controlled digesters of 1 l, each one in a bath at 35 ± 1°C and magnetically stirred. The best feeding for the culture was 1.7 g COD 1−1 day−1. The minimum hydraulic retention time was 6 days. The efficiency in COD removal of treatment varied between 90.1% and 72.4%. The biogas productivity was 0.19 l g−1 COD day−1.