Investigation of precursor reactions in the De-Novo-synthesis of PCDD/PCDF on fly ash

Stieglitz, L.; Bautz, H.; Roth, Wiesław J.; Zwick, G.

doi:10.1016/s0045-6535(97)00410-4

Cited by 68 publications

(48 citation statements)

References 9 publications

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“…In addition, it can be seen from Fig. 1 Co-PCB in both secondary copper and aluminum production, which is in coincidence with the prediction of Stieglitz et al about the de novo synthesis of organochlorocompounds in thermal process (Jay and Stieglitz, 1997;Stieglitz et al, 1997). This distribution indicates that the de novo synthesis may be also the main mechanism of formation of Co-PCB.…”

Section: Characterization Of Dioxin-like Pcbs Emission From Secondarysupporting

confidence: 88%

Estimation and characterization of PCDD/Fs and dioxin-like PCBs from secondary copper and aluminum metallurgies in China

et al. 2009

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Section: Characterization Of Dioxin-like Pcbs Emission From Secondarysupporting

confidence: 88%

Estimation and characterization of PCDD/Fs and dioxin-like PCBs from secondary copper and aluminum metallurgies in China

et al. 2009

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“…These indicate that the de novo synthesis may be the main formation mechanism of PCDD/Fs. Moreover, the higher R DF/DD in this study, as compared to other studies, 10,12 indicates that de novo synthesis is more likely to be the dominant formation mechanism of PCDD/Fs in the secondary lead metallurgy. In contrast, the importance of precursor formation and de novo synthesis in the formation of PCDD/Fs in the secondary zinc metallurgy is thought to be similar to each other because the ratio of PCDF/ PCDD is close to 1 also with the dominant presence of the lower chlorinated homologue in the stack gas samples.…”

Section: The Formation Mechanism Of Pcdd/fs and Dioxin-like Pcbs Relesupporting

confidence: 41%

Estimation and characterization of PCDD/Fs and dioxin-like PCB emission from secondary zinc and lead metallurgies in China

Zheng

Zhang

et al. 2009

J. Environ. Monit.

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Secondary zinc and lead production is addressed as one of the potential sources of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dioxinlike PCBs) due to the impurity of the raw material. However, the release inventory of PCDD/Fs and dioxin-like PCBs is very scarce for these secondary nonferrous metallurgies. This study selected typical secondary zinc and lead plants to investigate the emissions of PCDD/Fs and dioxin-like PCBs released from such plants in China. The toxic equivalent quantity (TEQ) emission factor of PCDD/Fs and dioxin-like PCBs released into the environment is higher for secondary zinc production, at 52 298.02 ng TEQ ton À1 than for secondary lead production, at 646.05 ng TEQ ton À1. The most abundant congeners of PCDD/Fs are 2,3,4,7,8-PeCDF and 1,2,3,4,6,7,8-HpCDF for the secondary zinc and lead metallurgies, respectively. The most abundant congener of dioxin-like PCBs in the samples collected from both metallurgies is CB-126 . According to the distribution of PCDD/Fs (PCDF/PCDD [ 1) and the dominant contribution of higher chlorinated congeners, the de novo synthesis is assumed to be the main formation pathway of PCDD/Fs in the secondary zinc metallurgies. For the secondary lead metallurgies, the role of precursor formation is also very important. Based on the emission factor and production level, the total estimated emission amounts of PCDD/Fs and dioxin-like PCBs in both stack gas and fly ash released into the environment from secondary zinc and lead production is estimated to be at least 2.76 and 0.42 g TEQ yr À1 , respectively. The dioxin-like PCBs contribute 2.8% and 0.6% of the total emission from secondary zinc and lead plants, respectively.

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“…Eiki KASAI, 1) Shunsuke KUZUHARA, 2) Hiroshi GOTO 3) and Taichi MURAKAMI 1) 1) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 Japan.…”

Section: Reduction In Dioxin Emissions By the Addition Of Urea As Aqumentioning

confidence: 99%

“…The largest contribution to such a reduction was made by the waste incinerators and was attributed to the drastic change from small batch-type furnaces to large continuous-type facilities and also to the application of advanced waste gas treatment systems. In the waste incineration process, the rapid cooling of high-temperature gases to less than 200°C is recommended; this action will suppress the de novo synthesis reaction 1) of dioxins during the cooling stage of waste gases. Additional measures such as activated carbon injection and catalytic decomposition process are often applied to waste gases.…”

Section: Introductionmentioning

confidence: 99%

Reduction in Dioxin Emissions by the Addition of Urea as Aqueous Solution to High-temperature Combustion Gas

et al. 2008

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Investigation of precursor reactions in the De-Novo-synthesis of PCDD/PCDF on fly ash

Cited by 68 publications

References 9 publications

Estimation and characterization of PCDD/Fs and dioxin-like PCBs from secondary copper and aluminum metallurgies in China

Estimation and characterization of PCDD/Fs and dioxin-like PCBs from secondary copper and aluminum metallurgies in China

Estimation and characterization of PCDD/Fs and dioxin-like PCB emission from secondary zinc and lead metallurgies in China

Reduction in Dioxin Emissions by the Addition of Urea as Aqueous Solution to High-temperature Combustion Gas

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