Anaerobic Digestion of Biodegradable Municipal Solid Waste and Activated Sludge

To discussion acid inhibition of municipal solid waste in the process of the anaerobic digestion, four biodegradable single substrates of soybean, fat meat, rice and celery cane were considered in this paper. A series of anaerobic co-digestion tests were performed on the four substrates at the load of 1.0 gVS/(L.d) and anaerobic activated sludge. The results show that the acid inhibition was occurred at the load of 1.0 gVS/(L.d) for the soybean and rice; the corresponding pH values at the lowest acidification points were 5.03 and 3.73, respectively. There was no acid inhibition during the whole digestion period for the celery cane at the tested loads.