 Production of high-grade biocrude and recovery of nutrient elements from wet torrefaction of sewage sludge coupled with co-liquefaction with soybean strawMengjiao Wang, Wenguang Zhou, Yunpu Wang, Haiwei Jiang, Weixin Wang, Jiabo Wu, Jinye Hu, Ting Luo, Qi Wang, Yuhang Hu and Liangliang Fan Renewable Energy, 2025, vol. 242, issue C 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. Keywords: Hydrothermal treatment; Nitrogen removal; Synergistic effect; Biocrude upgrading; Nitrogen and phosphorus recovery (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:242:y:2025:i:c:s0960148125000734 DOI: 10.1016/j.renene.2025.122411 Access Statistics for this article Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides More articles in Renewable Energy from Elsevier |
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