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  • 标题:Inhibition Behavior of PCDD/Fs Congeners by Addition of N-containing Compound in the Iron Ore Sintering
  • 本地全文:下载
  • 作者:Yifan Wang ; Lixin Qian ; Zhengwei Yu
  • 期刊名称:Aerosol and Air Quality Research
  • 印刷版ISSN:1680-8584
  • 出版年度:2020
  • 卷号:20
  • 期号:11
  • 页码:2568-2579
  • DOI:10.4209/aaqr.2019.12.0660
  • 语种:English
  • 出版社:Chinese Association for Aerosol Research in Taiwan
  • 摘要:PCDD/Fs are typical toxic persistent aromatic compounds that greatly reduce air quality and harm human health. In this study, urea’s suppressive effect on PCDD/Fs and their congener emissions was investigated via sintering pot tests, and the inhibition mechanisms were studied. The results showed that the I-TEQ values for the total PCDD/Fs decreased from 0.50 to 0.20, 0.12 and 0.20 ng I-TEQ Nm–3 after adding solid 0.02, 0.035 and 0.05 wt.% urea particles, respectively, to the iron ore sintering mixture, but these values increased for the low-chlorinated TeCDFs (from 0.003 to 0.009, 0.006 and 0.006 ng I-TEQ Nm–3) and TeCDDs (from 0.014 to 0.020, 0.018 and 0.020 ng I-TEQ Nm–3). Moreover, the average I-TEQ values for the chlorine substituents in the PCDFs and PCDDs decreased, indicating that urea inhibited chlorination or enhanced dechlorination. The potential mechanisms by which urea suppresses the total PCDD/Fs and hydrodechlorinates the high-chlorinated PCDD/Fs are discussed.
  • 关键词:PCDD/Fs; Congeners; Urea; Active radical; Iron ore sintering.
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