Role of Inorganic Chlorine in the Formation of Polychlorinated Dibenzo-p-dioxins/Dibenzofurans from Residual Carbon on Incinerator Fly Ash

NaCl was added to a solid waste incinerator fly ash to study its role in the formation of polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). Parameters that varied were as follows:  chloride concentration, oxygen concentration, temperature, and time. None of these reaction conditions...

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Bibliographic Details
Published in:Environmental science & technology 1998-11, Vol.32 (21), p.3356-3359
Main Authors: Addink, Ruud, Espourteille, François, Altwicker, Elmar R
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Chemical reactions
Chlorine
Combustion and energy production
DIBENZOFURANS
Dioxins
Exact sciences and technology
Incineration
PCB
Pollution
Pollution sources. Measurement results
Polychlorinated biphenyls
POLYCHLORINATED DIBENZOFURANS
Salt
SODIUM CHLORIDE
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Summary:NaCl was added to a solid waste incinerator fly ash to study its role in the formation of polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). Parameters that varied were as follows:  chloride concentration, oxygen concentration, temperature, and time. None of these reaction conditions resulted in an increase in PCDD/F formation, compared to undoped ash. An essentially zero-order behavior was observed for NaCl. When added to aqueous extracted ash, from which the soluble inorganic chloride had been removed before the addition, formation rates increased, with an optimum for [Cl-] = 0.4 mmol/g (1.5 wt %). These results suggested that NaCl acted only as a chlorinating reagent on fly ash when no other chlorine sources were available. Surprisingly, only PCDF was formed on the aqueous extracted ash after addition of NaCl. Apparently, the PCDD formation catalyst had been removed by the water.
ISSN:0013-936X
1520-5851
DOI:10.1021/es971080i