De-novo formation of dioxins and furans and the memory effect in waste incineration flue gases
- Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT (United Kingdom)
The formation of dioxin (polychlorinated-{rho}-dibenzodioxins - PCDD) and furan (polychlorinated dibenzofurans - PCDF) in waste incineration flyash in relation to temperature has been investigated in a bench scale reactor. The PCDD/PCDF released into the exhaust gases of the reactor and trapped in a condensation and vapour phase adsorption system were also determined. The concentrations of PCDD/PCDF in the flyash were analysed in detail for all congeners and isomers including the mono-, di- and tri-PCDD/PCDF. De-novo synthesis of PCDD/PCDF was clearly seen in the flyash with large changes in concentrations of PCDD/PCDF with only small changes in temperature. Exhaust gas PCDD/PCDF were detected at all temperatures, with the maximum emission occurring at a flyash temperature of 350 deg. C, where the equivalent of over 42 times the total dioxin/furan concentration of the original flyash was lost to the vapour phase per unit mass of initial flyash. Although the desorbed species were mainly the lower mono- to tri-congener group of dioxins and furans, the desorbed dioxin/furans had a considerable toxic equivalent value.
- OSTI ID:
- 21217138
- Journal Information:
- Waste Management, Journal Name: Waste Management Journal Issue: 2 Vol. 29; ISSN WAMAE2; ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
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