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, China.
State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Chemosphere. 2024 Oct;365:143358. doi: 10.1016/j.chemosphere.2024.143358. Epub 2024 Sep 17.
Biochar modification is an effective approach to enhance its ability to promote anaerobic digestion (AD). Focusing on the physical properties of biochar, the impact of different particle sizes of biochar on AD of food waste (FW) at high organic loading rate (OLR) was investigated. Four biochar with different sizes (40-200 mesh) were prepared and used in AD systems at OLR 30 g VS/L. The research results found that biochar with a volume particle size of 102 μm (RBC-P140) had top-performance in promoting cumulative methane production, increasing by 13.20% compared to the control group. The analysis results of the variety in volatile acids and alkalinity in the system did not show a correlation with the size of biochar, but small size has the potential to improve the environmental tolerance of the system to high acidity. Microbial community analysis showed that the abundance of aceticlastic methanogen and the composition of zoogloea were optimized through relatively small-sized biochar. Through revealing the effect of biochar particle size on AD system at high OLR, this work provided theoretical guidance for regulating fermentation systems using biochar.
生物炭改性是提高其促进厌氧消化（AD）能力的有效方法。本研究聚焦于生物炭的物理性质，考察了不同粒径的生物炭对高有机负荷率（OLR）下食物垃圾（FW）AD 的影响。本研究制备了四种不同粒径（40-200 目）的生物炭，并在 OLR 为 30 g VS/L 的 AD 系统中进行了应用。研究结果表明，体积粒径为 102μm 的生物炭（RBC-P140）在促进累积甲烷产量方面表现最佳，比对照组提高了 13.20%。系统中挥发性酸和碱度变化的分析结果表明，生物炭的粒径与挥发性酸和碱度的变化没有相关性，但小粒径有潜力提高系统对高酸度的环境耐受性。微生物群落分析表明，通过相对较小粒径的生物炭优化了乙酸营养型产甲烷菌的丰度和菌胶团的组成。通过揭示生物炭粒径对高 OLR 下 AD 系统的影响，本研究为利用生物炭调节发酵系统提供了理论指导。
