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Suppression of PCDD/Fs by Raw Meal in Cement Kilns

Category: Air Pollution and Health Effects

Volume: 18 | Issue: 4 | Pages: 1032-1043
DOI: 10.4209/aaqr.2018.01.0023
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Xiaoqing Lin1, Longjie Ji2, Mingxiu Zhan 1,3, Lingshu Wang1, Tong Chen1, Shengyong Lu1, Xiaodong Li1, Jianhua Yan1

  • 1 State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
  • 2 National Engineering Laboratory for Site Remediation Technologies, Beijing Construction Engineering Group Environmental Remediation Co., Ltd., Beijing 100015, China
  • 3 College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

Highlights

Raw materials can suppress the formation of PCDD/Fs.
The best ratio of MSW and raw material for PCDD/F suppression is 1:15.
NaCl and CuCl2 have adverse effects on PCDD/F suppression.
MSW containing high levels of Cl and Cu is not good for co-processing.


Abstract

Raw meal of the cement production process could probably suppress the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). In this study, these suppression effects were studied and compared during the co-processing of municipal solid waste (MSW) with conventional feed materials such as pure CaCO3, and pure CaO. A top suppression efficiency of 96% was achieved for a ratio of MSW to raw meal of 1:15. Moreover, NaCl and CuCl2 were added to the mix of feed material and MSW, to reveal the impact of additional chlorine and cations on PCDD/F formation. Similarly, the raw meal was mixed with the kiln dust to investigate possible suppression effects of those PCDD/Fs formed through the precursor or the de novo synthesis at a temperature of 350°C. The raw meal suppressed the formation of PCDD/Fs from kiln dust. Furthermore, the raw meal could not suppress the formation of PCDD/Fs on mixtures of kiln dust and NaCl or CuCl2, which could be associated with a potential increase in the formation effects of PCDD/Fs on the raw meal. The results can help in potential decision-making on the applicability of certain cement kilns on the co-processing of MSW containing high levels of Cl and Cu.

Keywords

PCDD/Fs Cement kiln Raw meal Suppression MSW co-processing


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