title: The effect of the labile organic fraction in food waste and the substrate/inoculum ratio on anaerobic digestion for a reliable methane yield.
abstract: Influence of the labile organic fraction (LOF) on anaerobic digestion of food waste was investigated in different S/I ratio of 0.33, 0.5, 1.0, 2.0 and 4.0g-VSsubstrate/g-VSinoculum. Two types of substrate, standard food waste (Substrate 1) and standard food waste with the supernatant (containing LOF) removed (Substrate 2) were used. Highest methane yield of 435ml-CH4g-VS(-1) in Substrate 1 was observed in the lowest S/I ratio, while the methane yield of the other S/I ratios were 38-73% lower than the highest yield due to acidification. The methane yields in Substrate 2 were relatively stable in all S/I conditions, although the maximum methane yield was low compared with Substrate 1. These results showed that LOF in food waste causes acidification, but also contributes to high methane yields, suggesting that low S/I ratio (<0.33) is required to obtain a reliable methane yield from food waste compared to other organic substrates.
authors.affiliation: Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
authors.forename: Minako
authors.initials: M
authors.lastname: Kawai
authors.affiliation: Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: norio.nagao@upm.edu.my.
authors.forename: Norio
authors.initials: N
authors.lastname: Nagao
authors.affiliation: Technology Advanced Metropolitan Area-Technology Licensing Organization Co., Ltd., 1-14-11 Hamura, Tokyo 192-0083, Japan.
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Tajima
authors.affiliation: Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Niwa
authors.affiliation: Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Matsuyama
authors.affiliation: Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
authors.forename: Tatsuki
authors.initials: T
authors.lastname: Toda
mesh_terms: D000693:Anaerobiosis; D001709:Biotechnology / Q000379:methods*; D005591:Chemical Fractionation; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005502:Food; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000378:metabolism*; D012722:Sewage; D013997:Time Factors; D014866:Waste Products
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D014866:Waste Products; D008697:Methane
keywords: Anaerobic digestion of food waste; Degradable carbon content; Substrate/inoculum ratio; VFAs; pH