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Effect of different particle-size biochar on methane emissions during pig manure/wheat straw aerobic composting: Insights into pore characterization and microbial mechanisms
- He, Xueqin, Yin, Hongjie, Sun, Xiaoxi, Han, Lujia, Huang, Guangqun
- Bioresource technology 2018 v.268 pp. 633-637
- Archaea, additives, bacteria, biochar, composting, greenhouse gas emissions, methane, methane production, methanogens, methanotrophs, micro-computed tomography, particle size, pig manure, porosity, rice straw, wheat straw
- This study explored the effects of different particle sizes of rice straw biochar (RSB) on the methane emissions of pig manure/wheat straw aerobic composting experiments to provide a theoretical suggestion for biochar application. The experiments were conducted with a control group, powder (<1 mm) group, and granular (4 mm–1 cm) group. Methane emissions increased by 56.84% in the powder group but decreased by 22.15% in the granular group during the aerobic composting. Methane was generated by methanogens and methanotrophs in the specific anaerobic micro-environment characterized by X-ray micro-computed tomography (micro-CT). The porosity of initial composting samples increased by 4.02% in the granular group but decreased by 3.88% in the powder group. RSB additives typically reduced the mcrA/pmoA ratio and increased the diversity of Bacteria and Archaea. Conclusively, granular biochar benefits to aerobic composting to alleviate the CH4 emissions.