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Reducing emission of NOx and SOx precursors while enhancing char production from pyrolysis of sewage sludge by torrefaction pretreatment

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  • Zheng, Anqing
  • Li, Luwei
  • Tippayawong, Nakorn
  • Huang, Zhen
  • Zhao, Kun
  • Wei, Guoqiang
  • Zhao, Zengli
  • Li, Haibin

Abstract

This study aims to explore the possibility of reducing emission of NOx and SOx precursors while enhancing char production from pyrolysis of sewage sludge by torrefaction pretreatment. The influence of torrefaction severity on structural alterations of sewage sludge and resulting pyrolysis behaviors was systematically studied. The experimental results show that 33.3% of N and 52.8% of S in sewage sludge can be removed by torrefaction pretreatment, leading to the evident reduction in the emission of NOx and SOx precursors (e.g. NH3, HCNO, H2S, COS and CS2) during subsequent pyrolysis of torrefied sewage sludge. Moreover, the yield and specific surface area of char from pyrolysis of sewage sludge can be improved by torrefaction. The char obtained from pyrolysis of sewage sludge torrefied at 300 °C exhibited the highest yield of 61.0 wt% and the maximum BET surface areas of 26.5 m2/g. These results could be ascribed to the devolatilization, polycondensation and charring of sewage sludge during torrefaction to form torrefied sewage sludge with stable aromatic and heterocyclic structure. These findings suggest that torrefaction is an effective pretreatment method prior to pyrolysis of sewage sludge for reducing emission of NOx and SOx precursors while enhancing yield and specific surface area of char.

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  • Zheng, Anqing & Li, Luwei & Tippayawong, Nakorn & Huang, Zhen & Zhao, Kun & Wei, Guoqiang & Zhao, Zengli & Li, Haibin, 2020. "Reducing emission of NOx and SOx precursors while enhancing char production from pyrolysis of sewage sludge by torrefaction pretreatment," Energy, Elsevier, vol. 192(C).
    • Handle: RePEc:eee:energy:v:192:y:2020:i:c:s0360544219323151
    DOI: 10.1016/j.energy.2019.116620
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    References listed on IDEAS

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    4. Ma, Jiao & Feng, Shuo & Zhang, Zhikun & Wang, Zhuozhi & Kong, Wenwen & Yuan, Peng & Shen, Boxiong & Mu, Lan, 2022. "Effect of torrefaction pretreatment on the combustion characteristics of the biodried products derived from municipal organic wastes," Energy, Elsevier, vol. 239(PD).
    5. Silveira, Edgar A. & Macedo, Lucélia A. & Rousset, Patrick & Candelier, Kevin & Galvão, Luiz Gustavo O. & Chaves, Bruno S. & Commandré, Jean-Michel, 2022. "A potassium responsive numerical path to model catalytic torrefaction kinetics," Energy, Elsevier, vol. 239(PB).
    6. Abdulyekeen, Kabir Abogunde & Umar, Ahmad Abulfathi & Patah, Muhamad Fazly Abdul & Daud, Wan Mohd Ashri Wan, 2021. "Torrefaction of biomass: Production of enhanced solid biofuel from municipal solid waste and other types of biomass," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    7. Lin, Y.L. & Chen, S.T. & Zheng, N.Y. & Wang, H.C., 2023. "Green sludge dewatering and recycling technology for generating renewable energy and liquid nutrients: Bench- and pilot-scale studies," Energy, Elsevier, vol. 278(PB).
    8. Deliang Xu & Liu Yang & Ming Zhao & Yu Song & Karnowo & Hong Zhang & Xun Hu & Hongqi Sun & Shu Zhang, 2020. "N Evolution and Physiochemical Structure Changes in Chars during Co-Pyrolysis: Effects of Abundance of Glucose in Fiberboard," Energies, MDPI, vol. 13(19), pages 1-13, October.
    9. Kossińska, Nina & Krzyżyńska, Renata & Ghazal, Heba & Jouhara, Hussam, 2023. "Hydrothermal carbonisation of sewage sludge and resulting biofuels as a sustainable energy source," Energy, Elsevier, vol. 275(C).

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