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Acid-catalyzed co-hydrothermal carbonization of sewage sludge and mixed straws to produce high-quality solid fuel

Author

Listed:
  • Liu, Xiaoguang
  • Gu, Jinna
  • Chen, Yongdong
  • Wang, Hong
  • Zhang, Chiqian
  • Yuan, Shijie
  • Dai, Xiaohu

Abstract

To improve the hydrochar fuel quality, acid-catalyzed co-hydrothermal carbonization (co-HTC) of sewage sludge with mixed straws were performed at 220 °C. The impacts of mixing ratio (1:0, 1:3, 1:1, 3:1, and 0:1) and solvent (0.5 M HCl or dionized water) on hydrochar quality were assessed. The acid-catalyzed co-HTC increased the higher heating value and fuel ratio of the hydrochar by decreasing the H/C atomic ratio and increasing the O/C atomic ratio. The devolatilization index (Di) and combustibility index (S) of the hydrochar from co-HTC at a sludge-to-straws dry-mass ratio of 1:1 reached 64.6 and 26.8 (10−8 wt%2 min−2 K−3), respectively, which was over three times and 2.5 times that from sludge. Di was affected by the surface functional groups, whereas S was related to the chemical composition and fuel properties. Less energy is required after acid-catalyzed co-HTC for both pyrolysis and combustion processes, because of the increase in O/C atomic ratio. This study not only demonstrates the yields and quality of the hydrochar in response to the variation of mixing ratio and solvent, but also uncovers the relationship between hydrochar quality and pyrolysis/combustion performance, thereby providing valuable information for optimizing the acid-catalyzed co-HTC process.

Suggested Citation

  • Liu, Xiaoguang & Gu, Jinna & Chen, Yongdong & Wang, Hong & Zhang, Chiqian & Yuan, Shijie & Dai, Xiaohu, 2024. "Acid-catalyzed co-hydrothermal carbonization of sewage sludge and mixed straws to produce high-quality solid fuel," Renewable Energy, Elsevier, vol. 237(PC).
  • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124018883
    DOI: 10.1016/j.renene.2024.121820
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    References listed on IDEAS

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    1. Zhang, Qiang & Mu, Kai & Han, Jun & Qin, Linbo & Zhao, Bo & Yi, Linlin, 2023. "Low nitrogen and high value hydrochar preparation through co-hydrothermal carbonization of sludge and saw dust with acid/alcohol assistance," Energy, Elsevier, vol. 278(PB).
    2. He, Chao & Giannis, Apostolos & Wang, Jing-Yuan, 2013. "Conversion of sewage sludge to clean solid fuel using hydrothermal carbonization: Hydrochar fuel characteristics and combustion behavior," Applied Energy, Elsevier, vol. 111(C), pages 257-266.
    3. Chen, Renjie & Yuan, Shijie & Wang, Xiankai & Dai, Xiaohu & Guo, Yali & Li, Chong & Wu, Haibin & Dong, Bin, 2023. "Mechanistic insight into the effect of hydrothermal treatment of sewage sludge on subsequent pyrolysis: Evolution of volatile and their interaction with pyrolysis kinetic and products compositions," Energy, Elsevier, vol. 266(C).
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