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Characteristics of tar, NOx precursors and their absorption performance with different scrubbing solvents during the pyrolysis of sewage sludge

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  • Chen, Hongfang
  • Namioka, Tomoaki
  • Yoshikawa, Kunio

Abstract

Recently thermal utilizations of sewage sludge, especially pyrolysis and gasification, are regarded as promising technologies due to efficient utilization of fuel gas. In this study, characteristics of tar and NOx precursors were investigated during the pyrolysis of sewage sludge. Moreover, absorption performance for tar and NOx precursors were also studied by using four kinds of scrubbing mediums: cooking oil, diesel oil, BDF and water. The results showed that nitrogenous light PAHs were the major components of nitrogenous tar produced from the pyrolysis of sewage sludge. As for gravimetric tar and major nitrogenous tar compounds removal, cooking oil was the most suitable absorbent. With respect to NOx precursors, it was concluded that HCN, sharing of about 39.5% of total nitrogen of the sewage sludge, was the main NOx precursor gas whereas NH3 content could be neglected. Absorption capacity of hydrophobic scrubbing mediums against NOx precursor gases could be arranged as followed: diesel oil>cooking oil>BDF.

Suggested Citation

  • Chen, Hongfang & Namioka, Tomoaki & Yoshikawa, Kunio, 2011. "Characteristics of tar, NOx precursors and their absorption performance with different scrubbing solvents during the pyrolysis of sewage sludge," Applied Energy, Elsevier, vol. 88(12), pages 5032-5041.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:5032-5041
    DOI: 10.1016/j.apenergy.2011.07.007
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    12. Zhan, Hao & Zhuang, Xiuzheng & Song, Yanpei & Yin, Xiuli & Wu, Chuangzhi, 2018. "Insights into the evolution of fuel-N to NOx precursors during pyrolysis of N-rich nonlignocellulosic biomass," Applied Energy, Elsevier, vol. 219(C), pages 20-33.
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