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Comprehensive evaluation of product characteristics and energy consumption in hydrothermal carbonization of food waste anaerobic digestate: A perspective on phosphorus recovery and fuel properties

Author

Listed:
  • Han, Mengxi
  • Liu, Hui
  • Chen, Dezhen
  • Feng, Yuheng
  • Tang, Yulin
  • Zhang, Qian
  • An, Qing
  • Hu, Weijie
  • Jin, Zechen
  • Yan, Kai

Abstract

Food waste digestate (FWD) is rich in organic matter and phosphorus(P) elements, making it a potential source for energy and P recovery. Hydrothermal carbonization (HTC) addresses FWD's dehydration and stability issues, improving hydrochar's fuel properties and P recovery in hydrothermal liquid. Experiments with various additives reveals 1M HCl's effectiveness, increasing P recovery by 88.31 % at 120 °C, decreasing hydrochar ash content by 21.42 %, and raising heating value by 45.01 %. Principal component analysis highlights the viability of acid treatment for P leaching and hydrochar enhancement, with pH as a crucial factor. HTC substantially reduces energy consumption by 57.42 % compared to direct drying. Hydrochar without additives shows potential as slow-release P fertilizers, with a 28.8 % increase in total phosphorus at 240 °C, where 99.4 % of P exists as apatite inorganic. Soil tests reveal differences with formic acid method in P availability, showing varying correlations with different P forms. This research offers insights for FWD resource utilization.

Suggested Citation

  • Han, Mengxi & Liu, Hui & Chen, Dezhen & Feng, Yuheng & Tang, Yulin & Zhang, Qian & An, Qing & Hu, Weijie & Jin, Zechen & Yan, Kai, 2024. "Comprehensive evaluation of product characteristics and energy consumption in hydrothermal carbonization of food waste anaerobic digestate: A perspective on phosphorus recovery and fuel properties," Renewable Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:renene:v:234:y:2024:i:c:s0960148124012369
    DOI: 10.1016/j.renene.2024.121168
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