ANAEROBIC-DIGESTION OF CO-MINGLED MUNICIPAL SOLID-WASTE AND SEWAGE-SLUDGE

This study evaluated the technical feasibility of the anaerobic co-dig estion process in the context of typical North American solid waste. U sing biological activity tests, an optimal mixture was identified with 25% organic fraction of municipal solid waste (OFMSW) and 75% sewage sludge (65% raw primary sludge (RAW), 35% thickened WAS (TWAS)) based on biogas production. Also, based on the rate of biogas production, th e most anaerobically biodegradable components of the OFMSW were paper and grass. The TWAS and the newspaper were found to be the least biode gradable components. Lab-scale testing indicated that alkaline pretrea tment increased the biodegradability of the sewage sludge/OFMSW mixtur e the most, as compared to the untreated control. Thermochemically pre treated feedstocks inhibited anaerobic biodegradability as compared to the control, whereas the anaerobic biodegradability of thermally pret reated feed was not found to be significantly different from that of t he control. Empirical models were developed based on alkaline dose, fe ed total solids concentration and particle size far biogas production and removal of TS and VS. All three experimental factors were found to be significant with respect to the response variables studied. (C) 19 98 Published by Elsevier Science Ltd. All rights reserved.