Yufeng Ma1, Xiaoqing Lin 1, Zhiliang Chen1, Tong Chen1, Mingxiu Zhan2, Shuaixi Xu3, Hailong Wu4, Xiaodong Li1, Jianhua Yan1


State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Zhejiang 310027, Chi
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Zhejiang Electric Power Design Institute Co., Ltd., Hangzhou 310012, China
Environment Protection Bureau of Zhoushan, Zhoushan 316021, China



Received: April 25, 2019
Revised: May 23, 2019
Accepted: May 25, 2019
Download Citation: ||https://doi.org/10.4209/aaqr.2019.04.0224 

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Cite this article:
Ma, Y., Lin, X., Chen, Z., Chen, T., Zhan, M., Xu, S., Wu, H., Li, X. and Yan, J. (2019). Emission Characteristics and Formation Pathways of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans from a Typical Pesticide Plant. Aerosol Air Qual. Res. 19: 1390-1399. https://doi.org/10.4209/aaqr.2019.04.0224


HIGHLIGHTS

  • The emission characteristics of the PCDD/Fs in pesticide plant were investigated.
  • The main formation area of PCDD/Fs is the quenching/deacidification tower.
  • The I-TEQ value in flue gas at outlet of stack meets the Chinese emission limit.
  • The TEQ estimated emission of PCDD/Fs is 9.3 g year–1 in the pesticide plant.

ABSTRACT


The emission characteristics and the formation pathways of the polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from a pesticide plant were well investigated. In the present study, the international toxic equivalent quantity (I-TEQ) value of the PCDD/Fs (0.087 ng I-TEQ Nm–3) in the flue gas at the outlet of stack can meet the emission limit (0.1 ng I-TEQ Nm–3). The I-TEQ value of the PCDD/Fs (3.25 pg I-TEQ g–1) in the fly ash is much lower than the permitted standard for disposal in sanitary landfill sites (3.0 ng of I-TEQ g–1). In addition, 1,2,3,4,6,7,8-HpCDD, OCDD and 1,2,3,4,6,7,8-HpCDF are the three main congeners in the PCDD/Fs for the outlet of both the secondary combustion chamber and the stack. 1,2,3,7,8-PeCDD, 1,2,3,6,7,8-HxCDD, 1,2,3,4,6,7,8-HpCDD and OCDD are the most dominant congeners for the PCDD/Fs from inlet of bag filter. PCDD/Fs may be formed through high temperature homogeneous synthesis and heterogeneous precursor synthesis in the flue gas. In addition, PCDD/Fs might be formed in bag filter via de novo synthesis. The main formation areas of PCDD/Fs are waste heat boiler and quenching/deacidification tower in this pesticide plant. The TEQ estimated emissions of PCDD/Fs reaches 9.3 g year–1. These findings are helpful for further controlling the formation and emission of PCDD/Fs in pesticide plants, yet more studies are still required.


Keywords: Polychlorinated dibenzo-p-dioxins and dibenzofurans; Chemical plant; Emission characteristics; TEQ emission factor; Formation pathways.

 



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5-Year Impact Factor: 2.827


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