title: In situ volatile fatty acids influence biogas generation from kitchen wastes by anaerobic digestion.
abstract: Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of volatile fatty acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3 ml g TS(-1), and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes.
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Zhiyang
authors.initials: Z
authors.lastname: Xu
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Mingxing
authors.initials: M
authors.lastname: Zhao
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Hengfeng
authors.initials: H
authors.lastname: Miao
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Huang
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Shumei
authors.initials: S
authors.lastname: Gao
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China. Electronic address: wqruanjn@gmail.com.
authors.forename: Wenquan
authors.initials: W
authors.lastname: Ruan
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000693:Anaerobiosis; D056804:Biofuels; D003296:Cooking; D058645:Denaturing Gradient Gel Electrophoresis; D005232:Fatty Acids, Volatile / Q000737:chemistry*; D064307:Microbiota; D016133:Polymerase Chain Reaction
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D019342:Acetic Acid
keywords: Anaerobic digestion; Kitchen wastes; Microbial community; Volatile fatty acids