title: Microbial and nutritional regulation of high-solids anaerobic mono-digestion of fruit and vegetable wastes.
abstract: The anaerobic digestion of single fruit and vegetable wastes (FVW) can be easily interrupted by rapid acidogenesis and inhibition of methanogen, and the digestion system tends to be particularly unstable at high solid content. In this study, the anaerobic digestion of FVW in batch experiments under mesophilic condition at a high solid concentration of 10% was successfully conducted to overcome the acidogenesis problem through several modifications. Firstly, compared with the conventional anaerobic sludge (CAS), the acclimated anaerobic granular sludge (AGS) was found to be a better inoculum due to its higher Archaea abundance. Secondly, waste activated sludge (WAS) was chosen to co-digest with FVW, because WAS had abundant proteins that could generate intermediate ammonium. The ammonium could neutralize the accumulated volatile fatty acids (VFAs) and prevent the pH value of the digestion system from rapidly decreasing. Co-digestion of FVW and WAS with TS ratio of 60:40 gave the highest biogas yield of 562 mL/g-VS and the highest methane yield of 362 mL/g-VS. Key parameters in the digestion process, including VFAs concentration, pH, enzyme activity, and microbial activity, were also examined.
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Mu
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Yuxiao
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zhang
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Hua
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Haipeng
authors.initials: H
authors.lastname: Xu
authors.affiliation: a Energy Research Institute of Shandong Academy of Sciences , Key Laboratory for Biomass Gasification Technology of Shandong Province , Jinan , People's Republic of China.
authors.forename: Fuqiang
authors.initials: F
authors.lastname: Jin
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D005232:Fatty Acids, Volatile; D005638:Fruit; D005735:Garbage; D012722:Sewage / Q000382:microbiology*; D014675:Vegetables; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage
keywords: Fruit and vegetable wastes; anaerobic co-digestion; anaerobic granular sludge; high-solids content; waste activated sludge