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The Behaviors and Relationships of PCDD/Fs and Chlorobenzenes in the Whole Process of one Municipal Solid Waste Incinerator

Category: Air Pollution and Health Effects

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.03.0092
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Tong Chen1, Tianjiao Wang1,2, Jie Yang3, Longjie Ji4, Guoshun Zhou2, Mingxiu Zhan 1,5, Xiaodong Li1, Xiaoqing Lin1

  • 1 State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
  • 2 Institute of Incineration Technology, Everbright Envirotech (China) Ltd., Nanjing 211102, China
  • 3 Zhejiang Fangyuan New Materials Co., Ltd., Zhejiang 318000, China
  • 4 National Engineering Laboratory for Site Remediation Technologies, Beijing Construction Engineering Group Environmental Remediation Co., Ltd., Beijing 100015, China
  • 5 College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

Highlights

The behavior of CBz compared with PCDD/Fs in the whole MSWI system was analyzed.
Characteristics in flue gas and fly ash were all investigated.
The detailed relationships among all PCDD/Fs and CBz congener profiles were revealed.
Correlation for gas/solid PCDD/Fs indication before and after the APCD were found.


Abstract

The characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and chlorobenzenes (CBzs) in flue gas and fly ash at the outlet of the furnace, outlet of the high-temperature superheater, inlet of the semi-dry scrubber and the stack after the APCD has been studied. Both PCDD/Fs and CBzs were mostly formed at low temperatures. The dominant PCDD/Fs generated in the gaseous phase were 23478-PeCDF and TCDF, and 124-TrCBz was the major CBz in both gaseous and solid phase. More PCDD/Fs were found in the solid phase with the decrease of temperature, while CBzs were at the opposite trend. Furthermore, activated carbon with low surface area and mesoporous volume showed low flue gas removal efficiencies of PCDD/Fs and CBzs in flue gas. The fraction of PCDD/Fs in the solid phase largely decreased when the flue gas passed through the fabric filter. And the memory effects of aged filter could also cause increasing fractions of 234678-HxCDF, 1234678-HpCDF and 1234678-HxCDD. Most importantly, the relationships between PCDD/Fs and CBzs in the flue gas and fly ash were analyzed, respectively. In the gaseous phase most of CBzs showed high correlation coefficients with PCDD/Fs, especially 123-TrCBz (R2 > 0.8). In solid phase the poor correlation coefficients were found between CBzs and PCDD/Fs except 135-TrCBz and 123-TrCBz (R2 = 0.8). A remarkable correlation was also found between 124-TrCBz in flue gas and PCDD/Fs in fly ash. It was concluded that TrCBzs could be regarded as the best indicator for PCDD/Fs in both flue gas and fly ash.

Keywords

Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans Chlorobenzenes Emission characteristic Correlations Gas-solid distribution


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