Fermentation of municipal primary sludge: effect of SRT and solids concentration on volatile fatty acid production

摘要

Laboratory bench-scale experiments were conducted to investigate the performance of primary sludge fementation for volatile fatty acids production. Primary sludges from two major wastewater treatment plants located in Valencia (Pinedo and Carraixet) were used. Experiments were performed at solids retention times between 4 and 10 days, and total volatile solids concentrations between 0.6/100 and 2.8/100. Operation at two temperatures(20°C and 30°C) was also checked. Results indicated the importance of feed sludge characteristics on volatile fatty acids yields, being approximately double for the Carraixet wastewater treatment plant sludge than for the Pinedo plant.