Surplus yeast is a residue produced during brewery process, which presents high contents of organic matter. Biogas production from yeast could significantly contribute to bioenergy production in breweries, via biogas generation. Co-digestion of surplus yeast and brewery wastewater in a single treatment step would simplify the technical and economical requirements for the transformation of both residues into biogas. The feasibility of such co-digestion process was studied by means of batch tests and a lab-scale UASB reactor operation. The effect of applying three pre-treatments (thermal, chemical and mechanical) to the surplus yeast was also studied. Results showed that co-digestion of yeast and brewery wastewater is feasible, since no negative effects of the joint digestion were observed. Pre-treatments tested in this research produced no significant improvements on biogas yield or digestion rates. Even though no negative effects were observed when digesting wastewater and yeast in a UASB reactor after 70 days, long-term studies would be needed in order to detect potential negative effects over granular sludge development, sometimes observed during the treatment of some wastewaters containing suspended solids.
Skip Nav Destination
Research Article| March 01 2010
Anaerobic co-digestion of surplus yeast and wastewater to increase energy recovery in breweries
Water Sci Technol (2010) 61 (5): 1129–1135.
K. Neira, D. Jeison; Anaerobic co-digestion of surplus yeast and wastewater to increase energy recovery in breweries. Water Sci Technol 1 March 2010; 61 (5): 1129–1135. doi: https://doi.org/10.2166/wst.2010.052
Download citation file: