Abstract
Few studies focused on the emission of polychlorinated-ρ-dibenzodioxins and dibenzofurans (PCDD/F) from different kinds of waste incinerators. This study was conducted in a full-scale MSW incineration plant to investigate the influence of different incinerator types on PCDD/F. Experimental results indicated that the 2,3,7,8-PCDD/F concentration in the inlet gas of the air pollution control system (APCS) in the studied fluidized bed was higher (2.03 ng I-TEQ/Nm3) than that of the grate (0.77 ng I-TEQ/Nm3). But gas in the outlet of APCS from both incinerators had an approximate concentration, lower than the Chinese emission limit of 0.1 ng I-TEQ/Nm3. Similar distribution patterns were observed for 2,3,7,8-PCDD/Fs, as well as 136 PCDD/F congeners. Specifically, OCDD and 1,2,3,4,6,7,8-HpCDD were major isomer constituents for 2,3,7,8-PCDD/F isomers. In terms of formation pathways, a similar formation mechanism was observed based on fingerprint characteristics of 136 PCDD/F congeners. De novo synthesis was the dominating formation pathway for both incinerators. Meanwhile, DD/DF chlorination was another contributor to PCDD/F formation, which in the fluidized bed was higher. In addition, little correlation (0.009 < R2 < 0.533) between conventional pollutants (HCl, CO, PM) and PCDD/Fs was found, suggesting little high-temperature synthesis observed and verifying the dominance of de novo synthesis.
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Abbreviations
- APCS:
-
Air pollution control system
- CBz:
-
Chlorobenzene
- CP:
-
Chlorophenol
- DD:
-
Dibenzodioxin
- DF:
-
Dibenzofuran
- EA:
-
Emission amount
- EF:
-
Emission factor
- FA:
-
Fly ash
- FB:
-
Fluidized-bed type incinerator
- GBI:
-
Exhaust gas sampled from the inlet of bag filters
- GCH:
-
Exhaust gas sampled from the chimney, which is also after the outlet of bag filters
- GI:
-
Grate type incinerator
- PCDD/Fs:
-
Polychlorinated dibenzo-p-dioxins and dibenzofurans
- PM:
-
Particulate matter
- I-TEF:
-
International toxic equivalency factor
- I-TEQ:
-
International toxic equivalency quantity
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Funding
This study was funded by the National Key Research and Development Program of China (2020YFC1910100).
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Yuxuan Ying: writing, methodology, software, formal analysis, investigation, visualization; Liang Xu: review and editing, formal analysis; Hao Zhang: methodology, data investigation; Xiaodong Li: project administration, funding acquisition; Shengyong Lu: funding acquisition; Yang Cao: data investigation; Xiaoqing Lin, Jisheng Long: methodology, validation, resources, writing — review and editing, project administration, supervision.
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Ying, Y., Xu, L., Lin, X. et al. Influence of different kinds of incinerators on PCDD/Fs: a case study of emission and formation pathway. Environ Sci Pollut Res 30, 5903–5916 (2023). https://doi.org/10.1007/s11356-022-22437-7
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DOI: https://doi.org/10.1007/s11356-022-22437-7