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Simultaneous regulation of nitrogen, sulfur and carbon using biochar during sewage sludge pyrolysis

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  • Yao, Zhitong
  • Chen, Xinyang
  • Sun, Yuhang
  • Qi, Wei

Abstract

Due to the complex nature of sewage sludge (SS), how to control the emission of precursor pollutants during its pyrolysis remains a challenge. In this work, the evolution of N, S and C during SS pyrolysis was investigated and biochars were employed to regulate their distribution in the resulting products. The release of N-containing products followed a descending order of NH3>HCN > NO > NO2 and the biochar addition resulted in a reduction of 40.7–54.3 % for these volatiles. The nitrile-N and pyrrolic-N species decreased, while the quaternary-N in residue increased significantly. The emission of S-containing products showed a descending order of COS > SO2>CH3SH > H2S > CS2 and the co-pyrolysis with biochar showed a reduction of 40.6–65.7 % for these products. The relative contents of thiophene-S and sulfoxide-S species increased, while the content of sulfone-S decreased. Biochar incorporation also resulted in a reduction of 67.2 % and 47.4 % for CO and CO2, respectively. Both Raman and XPS analysis indicated an increase in the graphitization degree and a decrease in structural defects.

Suggested Citation

  • Yao, Zhitong & Chen, Xinyang & Sun, Yuhang & Qi, Wei, 2024. "Simultaneous regulation of nitrogen, sulfur and carbon using biochar during sewage sludge pyrolysis," Renewable Energy, Elsevier, vol. 236(C).
    • Handle: RePEc:eee:renene:v:236:y:2024:i:c:s0960148124014812
    DOI: 10.1016/j.renene.2024.121413
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