Abstract：
Two kinds of Fe2O3-modified digestate-derived biochar (BC) were prepared and their effects on anaerobic digestion (AD) of kitchen waste (40.0 g VS/L) were investigated, with BC and Fe2O3 addition used as a comparison. The results showed that Fe2O3-modified BC (Fe2O3-BC1 prepared by co-precipitation and Fe2O3-BC2 by impregnation) significantly increased methane yield (20.8 % and 16.4 %, respectively) and reduced volatile fatty acid concentration (35.6 % and 29.6 %, respectively). Microbial high-throughput analysis revealed that Fe2O3-modified BC selectively enriched Clostridium (47.3 %) and Methanosarcina (72.2 %), suggesting that direct interspecies electron transfer contributing to improved biogas production performance was established and enhanced. Correlation analysis indicated that biogas production performance was improved by the larger specific surface area (83.4 m2/g), pore volume (0.101 cm3/g), and iron content (97.4 g/Kg) of the BC. These results offer insights for enhancing the efficacy of AD processes using Fe2O3-modified BCs as additives.
摘要：
制备了两种Fe2O3改性的消化产物衍生生物炭（BC），并研究了它们对餐厨垃圾（40.0gVS/L）厌氧消化（AD）的影响。与BC和Fe2O3添加作为比较。结果表明，Fe2O3改性的BC（共沉淀法制备的Fe2O3-BC1和浸渍法制备的Fe2O3-BC2）显着提高了甲烷产率（20.8％和16.4％，分别）和降低的挥发性脂肪酸浓度（35.6%和29.6%，分别)。微生物高通量分析显示，Fe2O3修饰的BC选择性富集了梭菌(47.3%)和甲烷(72.2%)，表明直接种间电子转移有助于提高沼气生产性能的建立和增强。相关分析表明,较大的比表面积(83.4m2/g)提高了沼气生产性能,孔体积（0.101cm3/g），和BC的铁含量（97.4g/Kg）。这些结果为增强使用Fe2O3改性的BC作为添加剂的AD工艺的功效提供了见解。
