title: Performance and kinetic evaluation of a semi-continuously fed anaerobic digester treating food waste: effect of trace elements on the digester recovery and stability.
abstract: This study investigated the effects of trace elements (TEs: Fe, Co, and Ni) on the anaerobic digestion of food waste in laboratory scale semi-continuously fed anaerobic digesters. The digesters were operated for approximately 460 d at organic loading rates (OLRs) ranging from 1.0 to 5.0 g VS L(-1)d(-1) at 37°C. Results showed that methane production was severely inhibited when volatile fatty acids (VFAs) concentration was 30,000 mg L(-1) at OLR of 4.0 g VS L(-1)d(-1) without the addition of TEs. However, the inhibition was gradually decreased and the methane production increased from 0.13 up to 0.44 L g(-1)VS added when the TEs was added. Fe was proved to be the essential element in maintaining the stability of the digester. The conversion coefficient of substrate into biogas (YS/G) was 1.00 and 1.26 gVS removedL(-1) biogas with and without TEs addition, respectively. The estimated biomass yield with feeding TEs (0.06 g VSS g(-1)COD removed) was higher three times than that without TEs (0.02 gVSS g(-1)COD removed).
authors.affiliation: Beijing University of Chemical Technology, 100029 Beijing, PR China; Beijing Municipal Research Institution of Environmental Protection, 100037 Beijing, PR China.
authors.forename: Quanyuan
authors.initials: Q
authors.lastname: Wei
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR 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, 100083 Beijing, PR China. Electronic address: jianbinguo@gmail.com.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Guo
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Shubiao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Beijing University of Chemical Technology, 100029 Beijing, PR China.
authors.forename: Tianwei
authors.initials: T
authors.lastname: Tan
authors.affiliation: Beijing University of Chemical Technology, 100029 Beijing, PR China. Electronic address: wangfang@mail.buct.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D002681:China; D003035:Cobalt / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005502:Food; D007501:Iron / Q000378:metabolism*; D007700:Kinetics; D008697:Methane / Q000378:metabolism; D009532:Nickel / Q000378:metabolism*; D012037:Refuse Disposal; D014131:Trace Elements / Q000378:metabolism*
chemical_list: D005232:Fatty Acids, Volatile; D014131:Trace Elements; D003035:Cobalt; D009532:Nickel; D007501:Iron; D008697:Methane
keywords: Anaerobic digestion; Biomass yield; Food waste; Kinetics; Trace elements