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Production of high-grade biocrude and recovery of nutrient elements from wet torrefaction of sewage sludge coupled with co-liquefaction with soybean straw

Author

Listed:
  • Wang, Mengjiao
  • Zhou, Wenguang
  • Wang, Yunpu
  • Jiang, Haiwei
  • Wang, Weixin
  • Wu, Jiabo
  • Hu, Jinye
  • Luo, Ting
  • Wang, Qi
  • Hu, Yuhang
  • Fan, Liangliang

Abstract

The application of hydrothermal liquefaction (HTL) technology for the production of biocrude is limited by the high N and O contents. In this study, a process combining wet torrefaction and co-HTL with soybean straw was developed for elevating biocrude production and quality. After the wet torrefaction, up to 30.9 % N and 35.4 % O of SS were removed. The HTL of the torrefied SS by co-feeding with soybean straw increased the biocrude yield to as high as 29.1 wt%. When the ratio of soybean straw and the torrefied SS was 2:1, the highest synergistic extents of denitrogenation and deoxygenation were obtained. Based on the N-rich aqueous phase from the wet torrefaction and P-rich solid residue from the co-HTL, a method of coupling recovery of N and P nutrients was proposed to produce the value-added N and P fertilizer (struvite), with the N and P recovery rates of 78.1 % and 94.0 %, respectively.

Suggested Citation

  • Wang, Mengjiao & Zhou, Wenguang & Wang, Yunpu & Jiang, Haiwei & Wang, Weixin & Wu, Jiabo & Hu, Jinye & Luo, Ting & Wang, Qi & Hu, Yuhang & Fan, Liangliang, 2025. "Production of high-grade biocrude and recovery of nutrient elements from wet torrefaction of sewage sludge coupled with co-liquefaction with soybean straw," Renewable Energy, Elsevier, vol. 242(C).
    • Handle: RePEc:eee:renene:v:242:y:2025:i:c:s0960148125000734
    DOI: 10.1016/j.renene.2025.122411
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    References listed on IDEAS

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