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MODELLING OF POLYCHLORINATED-DIOXIN AND -FURAN CONGENER PROFILES FROM MUNICIPAL WASTE COMBUSTION
Citation:
Gullett*, B K. AND J. Dunn. MODELLING OF POLYCHLORINATED-DIOXIN AND -FURAN CONGENER PROFILES FROM MUNICIPAL WASTE COMBUSTION. International Conference on Solid Waste Management: Thermal Treatment and Waste-to-energy Technologies, Washington, DC, 4/18-21/95.
Description:
The paper discusses a model, based on experimental data, that was developed to describe the profile of polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF) congeners formed in the duct region of a pilot-scale combustor simulating large-scale municipal waste combustion. The combustor allowed variation of operating conditions and gas concentrations to effect various conditions of hydrogen chloride (HCl), oxygen, and chlorine (Cl) concentration; temperature; residence time; quench rate; and calcium hydroxide sorbent injection. A translated Poisson process model uses structural equations to show the effect of operating parameters and Poisson model properties on sampled congener distributions and total yields. The model shows that increased HCl concentration results in higher yields of PCDD and PCDF and causes shifts to higher peak Cl-number congener distributions. Continued development of the model and its theory may provide mechanistic insight into preventing formation and reducing toxicity by alternation of combustion-related parameters.