稻秆粒径减小可提高厌氧消化中产甲烷量。
Particle size reduction of rice straw enhances methane production under anaerobic digestion.
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
出版信息
Bioresour Technol. 2019 Dec;293:122043. doi: 10.1016/j.biortech.2019.122043. Epub 2019 Aug 21.
The objective of this study was to investigate the effects of particle size reduction (20, 1, 0.15, and 0.075 mm) on biogas production from rice straw waste through batch anaerobic digestion experiments. To clarify the digestion mechanisms, the microbial community and rice straw properties including fractal dimension, dissolution abilities and the bio-liquefaction degree were determined. Particle size reduction of rice straw improved methane yield from 107 mL g VS to 197 mL g VS. The elevated digestion efficiency was attributed to the cellulose degradation (degradation rate from 27% to 93%) rather than hemicellulose or lignin. The comminution pretreatment improved the basic morphology, dissolution abilities and bio-liquefaction degree, which associated with the shifts in the bacterial community and the decreased bacterial diversity. These results suggested that particle size reduction of the rice straw in conjunction with optimized microbial growth could improve the methane yield in anaerobic digestion processes.
本研究旨在通过批式厌氧消化实验，探究粒径减小（20、1、0.15 和 0.075 毫米）对稻草废物沼气产量的影响。为了阐明消化机制，确定了微生物群落和稻草特性，包括分形维数、溶解能力和生物液化程度。稻草粒径的减小将甲烷产量从 107 mL g VS 提高到 197 mL g VS。提高消化效率归因于纤维素的降解（降解率从 27%提高到 93%），而不是半纤维素或木质素。粉碎预处理改善了基本形态、溶解能力和生物液化程度，这与细菌群落的变化和细菌多样性的降低有关。这些结果表明，稻草的粒径减小与优化的微生物生长相结合，可以提高厌氧消化过程中的甲烷产量。
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