Food waste treating by biochar-assisted high-solid anaerobic digestion coupled with steam gasification: Enhanced bioenergy generation and porous biochar production.

Jingxin Zhang, Yuxuan Cui, Tengyu Zhang, Qiang Hu, Yen Wah Tong, Yiliang He, Yanjun Dai, Chi-Hwa Wang, Yinghong Peng

Bioresource technology 2021 Jul

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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 CH4/g VS and 126.7 mL CH4/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/m3 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. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Jingxin Zhang, Yuxuan Cui, Tengyu Zhang, Qiang Hu, Yen Wah Tong, Yiliang He, Yanjun Dai, Chi-Hwa Wang, Yinghong Peng. Food waste treating by biochar-assisted high-solid anaerobic digestion coupled with steam gasification: Enhanced bioenergy generation and porous biochar production. Bioresource technology. 2021 Jul;331:125051