title: Enhancement of acidogenic fermentation for volatile fatty acid production from food waste: Effect of redox potential and inoculum.
abstract: The aim of this study was to explore the effects of redox potential (ORP) and inoculum on volatile fatty acids (VFAs) production from food waste by acidogenic fermentation. Four experimental conditions with two ORP levels were tested: limited aeration conditions with ORP level of -100 to -200mV inoculating anaerobic sludge (LA+AnS) or aerobic sludge (LA+AeS), and anaerobic conditions with ORP level of -200 to -300mV inoculating anaerobic sludge with 2-bromoethanosulfophate (AN+BES) and without BES (AN). The maximal VFA yield (0.79g COD/g VS) was attained in LA+AnS reactor due to enhanced hydrolysis of substrates, especially proteins (degradation efficiency 78.3%). A higher frequency of phylum Firmicutes under limited aeration conditions (42.2-48.2%) was observed than that under anaerobic conditions (21.1%). The microbial community was more diverse in LA+AnS reactors than LA+AeS. We conclude that appropriate ORP level (from -100 to -200mV) and inoculum play essential roles in VFA production.
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China. Electronic address: jun.yin77@gmail.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Yin
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Yu
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China.
authors.forename: Yeer
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Shen
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Meizhen
authors.initials: M
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Long
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Ting
authors.initials: T
authors.lastname: Chen
mesh_terms: D000143:Acids; D019149:Bioreactors / Q000382:microbiology*; D005232:Fatty Acids, Volatile / Q000096:biosynthesis / Q000737:chemistry; D005285:Fermentation; D005502:Food; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000382:microbiology
chemical_list: D000143:Acids; D005232:Fatty Acids, Volatile; D012722:Sewage
keywords: 2-Bromoethanosulfophate; Firmicutes; Microbial community; Redox potential; Volatile fatty acids