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Hydrochar derived from green waste by microwave hydrothermal carbonization

Shao, Yuchao, Long, Yuyang, Wang, Hengyi, Liu, Dongyun, Shen, Dongsheng, Chen, Ting
Renewable energy 2019 v.135 pp. 1327-1334
adsorbents, biofuels, cellulose, economic evaluation, green waste, hemicellulose, hydrochars, hydrothermal carbonization, storage temperature, sustainable technology
Green waste (GW), rich in cellulose and hemicellulose, is a valuable resource. Developing alternative sustainable technologies to utilize GW is attracting increasing attention. In this study, microwave hydrothermal carbonization (MHTC) process parameters including holding temperature, holding time, and liquid-to-solid ratio were optimized by a response surface design to tailor the properties of hydrochar. The hydrochar characteristic was mainly evaluated by the calorific value. The results showed that the highest hydrochar calorific value (∼23.01 MJ kg−1) could be observed at a holding temperature of 190 °C, a holding time of 1 h and liquid-to-solid ratio of 8:1. Correspondingly, the hydrochar yield ranged from 50.40% to 76.80%. The economic evaluation of hydrochar was also done in this work. These results show that the GW-derived hydrochar warrants further investigations as a fuel source and as an adsorbent material.