青贮和青贮添加剂对柳枝稷厌氧消化中产沼气和微生物群落动态的影响。
Effect of ensiling and silage additives on biogas production and microbial community dynamics during anaerobic digestion of switchgrass.
机构信息
College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
Daxing District Bureau of Statistics of Beijing Municipality, Beijing 102600, China.
出版信息
Bioresour Technol. 2017 Oct;241:349-359. doi: 10.1016/j.biortech.2017.03.183. Epub 2017 Apr 1.
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.
青贮处理对厌氧处理底物的甲烷产量有重要的积极影响。本研究探讨了不同添加剂青贮处理后杂交柳枝稷特性的变化及其对甲烷生成和厌氧消化过程中微生物群落变化的影响。与新鲜杂交柳枝稷（FS）相比，青贮后（CK）的甲烷产量提高了 33.59%。与 CK 处理相比，用 LBr+X、LBr 和 X 青贮分别使甲烷生成提高了 17.41%、13.08%和 8.72%。修正的 Gompertz 模型预测，最优处理是 LBr+X，其潜在的累积甲烷产量为 178.31mL/g 总固体（TS），最大沼气产率为 44.39mL/g TS·d。厚壁菌门和拟杆菌门是 FS 和青贮杂交柳枝稷中的主要细菌；然而，用 LBr+X 处理的杂交柳枝稷富含产甲烷菌，这对甲烷生成至关重要。
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