China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, PR China.
Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK.
Bioresour Technol. 2021 Jul;331:125051. doi: 10.1016/j.biortech.2021.125051. Epub 2021 Mar 26.
A food waste treating system was proposed in this study by combining biochar-assisted high-solid anaerobic digestion and subsequent steam gasification of the digestate. The effect of solid level, biochar dosage in anaerobic digestion on the properties of biogas, syngas, and final biochar products were investigated. Results showed that at a high total solid level and biochar dosage of 25 g/L and 50 g/L, the accumulative methane yield reached 110.3 mL CH/g VS and 126.7 mL CH/g VS, respectively. From steam gasification of different digestates under 850 °C for 15 min, a maximum of 34.92 mmol/g for the hydrogen yield and 11.44 MJ/m for the higher heating value could be obtained for the syngas. Furthermore, the by-product produced from steam gasification was a nutrient-enriched porous biochar, which was suitable to be used as compost. This study demonstrated a pathway for food waste treating to produce methane-enriched biogas, hydrogen-enriched syngas, and nutrient-enriched biochar.
本研究提出了一种将生物炭辅助高固体厌氧消化与消化物后续蒸汽气化相结合的食物垃圾处理系统。考察了固体水平、厌氧消化中生物炭用量对沼气、合成气和最终生物炭产品性能的影响。结果表明，在总固体水平和生物炭用量分别为 25g/L 和 50g/L 时，累积甲烷产量分别达到 110.3mL CH/gVS 和 126.7mL CH/gVS。在 850°C 下对不同消化物进行蒸汽气化 15min，可获得最大 34.92mmol/g 的氢气产率和 11.44MJ/m 的高热值的合成气。此外，蒸汽气化产生的副产物是一种富含养分的多孔生物炭，适合用作堆肥。本研究为食物垃圾处理生产富含甲烷的沼气、富含氢气的合成气和富含养分的生物炭提供了一条途径。
