Journal
BIORESOURCE TECHNOLOGY
Volume 218, Issue -, Pages 463-468Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.123
Keywords
Food waste; Stillage reflux; Regulation methods; Ethanol fermentation
Funding
- International Science & Technology Cooperation Program of China [2013DFG92600]
- National Scientific Funding of China [51008020, 51378003]
- Beijing Higher Education Young Elite Teacher Project
- Fundamental Research Funds for the Central Universities
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Stillage reflux fermentation in food waste ethanol fermentation could reduce sewage discharge but exert a harmful effect because of side-product accumulation. In this study, regulation methods based on metabolic regulation and side-product alleviation were conducted. Result demonstrated that controlling the proper oxidation-reduction potential value (-150 mV to -250 mV) could reduce the harmful effect, improve ethanol yield by 21%, and reduce fermentation time by 20%. The methods of adding calcium carbonate to adjust the accumulated lactic acid showed that ethanol yield increased by 17.3%, and fermentation time decreased by 20%. The accumulated glyceal also shows that these two methods can reduce the harmful effect. Fermentation time lasted for seven times without effect, and metabolic regulation had a better effect than side-product regulation. (C) 2016 Elsevier Ltd. All rights reserved.
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