title: Performance and kinetic evaluation of semi-continuously fed anaerobic digesters treating food waste: role of trace elements.
abstract: This study investigated the effects of trace elements (TEs) on the anaerobic digestion (AD) of food waste (FW) in laboratory-scale semi-continuously fed anaerobic digesters. The duration of digesters operation was approximately 400 days. Organic loading rates (OLRs) ranged from 1.0 to 5.5 g VS L(-1) d(-1) at 37 °C. Results showed that methane production of the digester was severely inhibited at a volatile fatty acid (VFA) concentration of 30,000 mg L(-1) at OLR of 4.0 g VS L(-1) d(-1) in the absence of TEs. Contrary to the failed digesters, a stable performance was achieved in the TEs added digesters. High methane yield (approximately 465.4 mL CH4 g(-1)VSadded) was obtained, and no significant accumulation of VFA was observed in the TEs added digesters at OLR of 1.0-5.0 g VS L(-1) d(-1) and HRT of 40 days. These findings strongly indicated that the addition of TEs has an important impact on the operation stability of AD of FW.
authors.affiliation: College Agriculture and Biotechnology, China Agricultural University, Beijing 100093, People's Republic of China; Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China.
authors.forename: Wanqin
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China. Electronic address: wushubiao@gmail.com.
authors.forename: Shubiao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Guo
authors.affiliation: College Agriculture and Biotechnology, China Agricultural University, Beijing 100093, People's Republic of China; Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D005502:Food; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008697:Methane / Q000096:biosynthesis; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods*; D014131:Trace Elements / Q000032:analysis*; D014866:Waste Products / Q000032:analysis*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D014131:Trace Elements; D014866:Waste Products; D008697:Methane
keywords: Anaerobic digestion; Biomass yield; Food waste; Kinetics; Trace elements