Centre for Environmental Science and Engineering, IIT Bombay, Mumbai 400076, India.
Department of Chemical Engineering, IIT Bombay, Mumbai 400076, India.
Bioresour Technol. 2019 Aug;285:121329. doi: 10.1016/j.biortech.2019.121329. Epub 2019 Apr 9.
In this study, food waste (FW) and paper wastes were subjected to hydrothermal carbonization (HTC) with a purpose to improve energy recovery potential. FW is suggested as the suitable feedstock for production of hydrochar (HC) having highest calorific value (29.6 MJ/kg). Carbon content in FW derived HC was increased from 50% to ∼72% whereas energy retention efficiency was found to be 5.74 times of that in FW. Wastewater recovered after HTC of FW was rich in carbohydrates with chemical oxygen demand of ∼56,000 mg/L which may further be subjected to anaerobic treatment for biogas generation. Energy balance calculations showed that the solid and liquid fractions recovered after HTC of FW yielded highest energy output (2950 kJ/kg FW) compared to incineration (2217 kJ/kg FW), anaerobic digestion (2605 kJ/kg) and in-vessel composting. HTC process can be adopted as decentralized facility by institutions where highly moisturized wastes are generated.
在这项研究中，对食物垃圾（FW）和废纸进行了水热碳化（HTC）处理，以提高能源回收潜力。FW 被建议作为生产具有最高热值（29.6MJ/kg）的水热炭（HC）的合适原料。FW 衍生的 HC 中的碳含量从 50%增加到约 72%，而能量保持效率则比 FW 高 5.74 倍。FW 的 HTC 后回收的废水富含碳水化合物，化学需氧量约为 56000mg/L，可进一步进行厌氧处理以产生沼气。能量平衡计算表明，与焚烧（2217kJ/kg FW）、厌氧消化（2605kJ/kg FW）和容器内堆肥相比，FW 的 HTC 后回收的固、液两部分产生的能量输出最高（2950kJ/kg FW）。HTC 工艺可被产生高湿度废物的机构采用作为分散式设施。
