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Evaluation on thermal treatment for sludge from the liquid digestion of restaurant food waste

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  • Liu, Jingxin
  • Huang, Simian
  • Wang, Teng
  • Mei, Meng
  • Chen, Si
  • Zhang, Wenjuan
  • Li, Jinping

Abstract

During the anaerobic digestion of restaurant food waste, the sludge obtained as the sediment from the liquid digestate (LDS) is a high–yield solid waste. However, its valorization has not attracted sufficient attention. This study systematically detected the physicochemical properties of this sludge, proposed and evaluated thermal strategies of pyrolysis and combustion. Pyrolysis was a mild endothermic process with considerable H2O, CO2, and hydrocarbon releasing, and the LDS-derived biochar had pore structures and abundant functional groups. Combustion was exothermic in a broad temperature interval of 140 °C–580 °C with emissions of H2O, CO2, and NH3, but the process was mild and slow, revealing the poor combustibility of LDS, in addition, the ash had a medium deposition tendency. According to the results obtained in this study, pyrolysis was suggested as a more appropriate method for the reduction and reutilization of LDS. This work will be useful and helpful for LDS valorization, thereby, facilitating the spread and popularization of anaerobic digestion of food waste.

Suggested Citation

  • Liu, Jingxin & Huang, Simian & Wang, Teng & Mei, Meng & Chen, Si & Zhang, Wenjuan & Li, Jinping, 2021. "Evaluation on thermal treatment for sludge from the liquid digestion of restaurant food waste," Renewable Energy, Elsevier, vol. 179(C), pages 179-188.
    • Handle: RePEc:eee:renene:v:179:y:2021:i:c:p:179-188
    DOI: 10.1016/j.renene.2021.07.022
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    1. Kaur, Puneet & Talwar, Shalini & Madanaguli, Arun & Srivastava, Shalini & Dhir, Amandeep, 2022. "Corporate social responsibility (CSR) and hospitality sector: Charting new frontiers for restaurant businesses," Journal of Business Research, Elsevier, vol. 144(C), pages 1234-1248.

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