Journal
BIORESOURCE TECHNOLOGY
Volume 124, Issue -, Pages 328-337Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.08.064
Keywords
Anaerobic digestion; Biogas production; Brewery yeast; Brewery wastewater; Microbial biomass
Funding
- Slovenian brewing industry
- Slovenian Research Agency
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The anaerobic co-digestion of brewery yeast using granular biomass was studied on the lab, pilot and full-scale. The study shows no adverse effects in the co-digestion of yeast and wastewater in concentrations up to 1.1 (v/v)%. In concentrations up to 2.3% the process is manageable; however, not advisable. In concentrations over 2.8% the process exhibits failure due to the overload with suspended solids. An average specific biogas production of 0.560 m(3) kg(-1) of volatile solids was achieved. Full-scale operation with 0.7% yeast concentration showed a 38.5% increase in the biogas production and a 26.2% increase in the organic loading rate, which resulted in an increase of the biomethane/natural-gas substitute ratio from 10% to 16%. The influence of the yeast addition on the structure of the microbial biomass showed up to 7% dissimilarity in the archaeal and a 32% dissimilarity in the bacterial biomass community, which did not present any difficulties. (C) 2012 Elsevier Ltd. All rights reserved.
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