title: Improving production of volatile fatty acids from food waste fermentation by hydrothermal pretreatment.
abstract: Food waste (FW) was pretreated by a hydrothermal method and then fermented for volatile fatty acid (VFAs) production. The soluble substance in FW increased after hydrothermal pretreatment (⩽200 °C). Higher hydrothermal temperature would lead to mineralization of the organic compounds. The optimal temperature for organic dissolution was 180 °C, at which FW dissolved 42.5% more soluble chemical oxygen demand than the control. VFA production from pretreated FW fermentation was significantly enhanced compared with the control. The optimal hydrothermal temperature was 160 °C with a VFA yield of 0.908 g/g VSremoval. Butyrate and acetate were the prevalent VFAs followed by propionate and valerate. FW fermentation was inhibited after 200 °C pretreatment. The VFAs were extracted from the fermentation broth by liquid-liquid extraction. The VFA recovery was 50-70%. Thus, 0.294-0.411 g VFAs could be obtained per gram of hydrothermally pretreated FW (in dry weight) by this method.
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, 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, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.affiliation: Zhejiang Lantu Environmental Protection Co., Ltd, Hangzhou 310014, China.
authors.forename: Yuqiang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Shen
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
authors.forename: Meizhen
authors.initials: M
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
authors.forename: Han
authors.initials: H
authors.lastname: Mo
mesh_terms: D000085:Acetates / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002087:Butyrates / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000096:biosynthesis*; D005285:Fermentation; D005502:Food; D006358:Hot Temperature; D059625:Liquid-Liquid Extraction; D014866:Waste Products; D014867:Water / Q000737:chemistry*
chemical_list: D000085:Acetates; D002087:Butyrates; D005232:Fatty Acids, Volatile; D014866:Waste Products; D014867:Water
keywords: Fermentation; Food waste; Hydrothermal pretreatment; VFAs extraction; Volatile fatty acids