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Effect of ensiling and silage additives on biogas production and microbial community dynamics during anaerobic digestion of switchgrass. 2017

Xiaoling Zhao, and Jinhuan Liu, and Jingjing Liu, and Fuyu Yang, and Wanbin Zhu, and Xufeng Yuan, and Yuegao Hu, and Zongjun Cui, and Xiaofen Wang
College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.

Silage processing has a crucial positive impact on the methane yield of anaerobic treated substrates. Changes in the characteristics of switchgrass after ensiling with different additives and their effects on methane production and microbial community changes during anaerobic digestion were investigated. After ensiling (CK), methane yield was increased by 33.59% relative to that of fresh switchgrass (FS). In comparison with the CK treatment, methane production was improved by 17.41%, 13.08% and 8.72% in response to ensiling with LBr+X, LBr and X, respectively. A modified Gompertz model predicted that the optimum treatment was LBr+X, with a potential cumulative methane yield of 178.31mL/g total solids (TS) and a maximum biogas production rate of 44.39mL/g TS·d. Firmicutes and Bacteroidetes were the predominant bacteria in FS and silage switchgrass; however, the switchgrass treated with LBr+X was rich in Synergistetes, which was crucial for methane production.

UI MeSH Term Description Entries
D008697 Methane The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed)
D008897 Panicum A plant genus of the family POACEAE. The seed is one of the EDIBLE GRAINS used in millet cereals and in feed for birds and livestock (ANIMAL FEED). It contains diosgenin (SAPONINS). Millet, Broomcorn,Millet, Common,Millet, Little,Panicgrass,Panicum miliaceum,Panicum miliare,Panicum virgatum,Proso Millet,Switchgrass,Broomcorn Millet,Common Millet,Little Millet,Millet, Proso,Millets, Proso,Proso Millets,Switchgrasses,miliaceums, Panicum
D004063 Digestion The process of breakdown of food for metabolism and use by the body.
D012820 Silage Fodder converted into succulent feed for livestock through processes of anaerobic fermentation (as in a silo).
D056804 Biofuels Hydrocarbon-rich byproducts from the non-fossilized BIOMASS that are combusted to generate energy as opposed to fossilized hydrocarbon deposits (FOSSIL FUELS). Biodiesel,Biofuel,Biofuel Oils,Biogas,Biodiesels,Biofuel Oil,Oil, Biofuel,Oils, Biofuel

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