Anaerobic co-digestion of vegetal oil and thickened waste-activated sludge: Effects on biogas production and microbial community structure

摘要

Thickened waste-activated sludge (tWAS) was co-digested with vegetal oil in a continuous 50 L digester. Compared to a digester fed with only tWAS, the biogas production increased as expected due to the addition of oil: about 60 % for an oil load of 10-15 % of the volatile solids (VS) load and a triplication for an oil load of 37-44%. Using 454 pyrosequencing, the microbial community structure was analyzed and visualised in a non-metric multidimensional scaling. The community of the Bacteria in the two digesters, which accounts up to 97% of the operational taxonomic units shifted into two distinct structures which exhibited a relative stabilization