title: Combined effect of crude fat content and initial substrate concentration on batch anaerobic digestion characteristics of food waste.
abstract: The mesophilic anaerobic digestion (AD) characteristics of food waste (FW) with different crude fat (CF) contents and four initial substrate concentrations (4, 6, 8, and 10gVS/L) were investigated. The maximum methane yields of FW with CF contents of 15%, 20%, 25%, 30%, and 35% were 565.0, 580.2, 606.0, 630.2 and 573.0mLCH4/gVSadded, respectively. An acidification trend with a drop in pH (<6.80) and increase in the volatile fatty acids/total inorganic carbon (VFAs/TIC) ratio (>0.4) were found for CF contents of 30% (10gVS/L) and 35% (8 and 10gVS/L). A 35% CF content in FW led to decrease in the first-order degradation constant of approximately by 40%. The modified Gompertz model showed that the lag phase (λ) was prolonged from 0.4 to 7.1days when the CF content in FW and initial substrate concentration were increased to 35% and 10gVS/L.
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; College of Engineering (Biomass Engineering Center), China Agricultural University, Beijing 100083, PR China. Electronic address: zhang394982409@126.com.
authors.forename: Wanqin
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, PR China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Lang
authors.affiliation: Tus-Sound Environmental Resources Co., Ltd, Beijing 101102, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Fang
authors.affiliation: College of Engineering (Biomass Engineering Center), China Agricultural University, Beijing 100083, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute Superior Agronomy and Veterinary of Faranah (ISAV/F), Faranah 131, Guinea.
authors.forename: Hamidou
authors.initials: H
authors.lastname: Bah
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
authors.forename: Hongmin
authors.initials: H
authors.lastname: Dong
authors.affiliation: College of Engineering (Biomass Engineering Center), China Agricultural University, Beijing 100083, PR China. Electronic address: rjdong@cau.edu.cn.
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D004041:Dietary Fats / Q000494:pharmacology*; D005232:Fatty Acids, Volatile / Q000737:chemistry; D005502:Food; D019649:Food Industry / Q000379:methods; D006801:Humans; D008697:Methane / Q000378:metabolism; D008962:Models, Theoretical; D062611:Solid Waste; D018505:Waste Management / Q000379:methods
chemical_list: D004041:Dietary Fats; D005232:Fatty Acids, Volatile; D062611:Solid Waste; D008697:Methane
keywords: Anaerobic digestion; Crude fat content; Food waste; Initial substrate concentration; Kinetic study