State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China; Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2022 Jan;344(Pt B):126353. doi: 10.1016/j.biortech.2021.126353. Epub 2021 Nov 17.
This study evaluated the effects of bio-based carbon materials on methane production by anaerobic digestion. The results showed that biochar and hydrochar can promote cumulative methane yield by 15% to 29%. However, there was no statistical significance (p > 0.05) between hydrochar and biochar produced at different temperature on methane production. 16S rRNA gene sequencing and bioinformatics analysis showed that biochar and hydrochar enriched microorganism that might participate in direct interspecies electron transfer (DIET) such as Pseudomonadaceae, Bacillaceae, and Clostridiaceae. The the surface properties of the modified biochar were characterized with BET, Raman, FTIR and XPS. Bio-based carbon materials with uniform dispersion provided a stable environment for the DIET of microorganisms and electrons are transferred through aromatic functional groups on the surface of materials. This study reveals bio-based carbon materials surface properties on methane production in anaerobic digestion and provides a new approach to recycling spent coffee grounds.
本研究评估了生物基碳材料对厌氧消化产甲烷的影响。结果表明，生物炭和水热炭可将累积甲烷产量提高 15%至 29%。然而，不同温度下制备的水热炭和生物炭对甲烷产量的影响没有统计学意义（p>0.05）。16S rRNA 基因测序和生物信息学分析表明，生物炭和水热炭富集了可能参与直接种间电子传递（DIET）的微生物，如假单胞菌科、芽孢杆菌科和梭菌科。采用 BET、拉曼、FTIR 和 XPS 对改性生物炭的表面性质进行了表征。具有均匀分散性的生物基碳材料为微生物的 DIET 提供了稳定的环境，电子通过材料表面的芳族官能团传递。本研究揭示了生物基碳材料表面性质对厌氧消化产甲烷的影响，为咖啡渣的回收利用提供了新途径。
