title: Alleviation of harmful effect in stillage reflux in food waste ethanol fermentation based on metabolic and side-product accumulation regulation.
abstract: 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 (-150mV to -250mV) 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.
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China. Electronic address: mhz527@sina.com.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Ma
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Jia
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China.
authors.forename: Qunhui
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Ma
authors.affiliation: Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Sonomoto
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry*; D005285:Fermentation; D005502:Food; D005990:Glycerol / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D013696:Temperature
chemical_list: D019344:Lactic Acid; D000431:Ethanol; D002119:Calcium Carbonate; D005990:Glycerol
keywords: Ethanol fermentation; Food waste; Regulation methods; Stillage reflux