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Evaluation of Thermal Treatments for Elutriated Mixed Incinerator Ashes. Part 1: Co-Incineration with Laboratory Waste

Category: Control Techniques and Strategy

Volume: 16 | Issue: 9 | Pages: 2278-2286
DOI: 10.4209/aaqr.2016.05.0176
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Jian-Wen Wang1, Jhong-Lin Wu2,3, Cheng-Hsien Tsai4, Chih-Ta Wang1, Yi-Chyun Hsu5, Yi-Ming Kuo 1

  • 1 Department of Safety Health and Environmental Engineering, Chung Hwa University of Medical Technology, Tainan City 717, Taiwan
  • 2 Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan
  • 3 Environmental Resource Management Research Center, National Cheng Kung University, Tainan City 709, Taiwan
  • 4 Department of Chemical and Material Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
  • 5 Department of Environmental Engineering, Kun Shan University, Tainan 71003, Taiwan

Highlights

Co-incineration of elutriated incinerator ashes with laboratory waste was evaluated.
The pollutant concentration of the flue gas met the regulated standard in Taiwan.
Pollution characteristics of output-materials of co-incineration were investigated.


Abstract

This study describes polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) behavior during the co-incineration of elutriated mixed incinerator ashes with laboratory waste. The input and output materials during elutriation and incineration processes were sampled and analyzed using a high-resolution gas chromatography/high-resolution mass spectrometry assay. The elutriation process mainly washed out soluble salts and thus resulted in an increase in the level of PCDD/F in the mixed incinerator ashes. After co-incineration with laboratory waste, the PCDD/F concentration of the flue gas met the regulated standard in Taiwan, and the PCDD/F mainly existed as a particulate phase. However, the PCDD/F levels in fly ashes that included elutriated ash in the incinerator were higher than those of fly ashes without it. The co-incineration output-mass/input-mass ratio of elutriated ash with laboratory waste was 0.34. According to the X-ray diffraction analysis results and scanning electron microscopy images, the main crystalline phase of the fly ashes was NaCl. The NaCl came from the reaction of HCl in the flue gas and the NaOH injected in the quenching tower after treatment in the co-incineration system.

Keywords

Air pollution control devices Fly ash Co-incineration Elutriation


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