Journal
BIORESOURCE TECHNOLOGY
Volume 241, Issue -, Pages 349-359Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.03.183
Keywords
Switchgrass; Xylanase; Lactobacillus brevis; Methane production; Microbial community
Funding
- Special Fund for Agro-Scientific Research in the Public Interest, China [201503137]
- National 863 Program of China [2012AA101802]
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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 178.31 mL/g total solids (TS) and a maximum biogas production rate of 44.39 mL/g TS center dot 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. (C) 2017 Published by Elsevier Ltd.
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