Abstract
Adsorption and chlorination reactions for dibenzo-p-dioxin (DD) and 1-chlorodibenzo-p-dioxin (1-MCDD) on fly ash were characterized quantitatively using laboratory-based simulation of stack emissions with air and HCl-air atmospheres. Influences of contact time and temperature were studied and results showed behavior of DD and 1-MCDD consistent with that for 1,2,3,4-tetrachlorodibenzo-p-dioxin. Di-, tri-, and tetra-chlorinated dioxins were major compounds produced from heterogenous phase reactions of DD and 1-MCDD with HCl in air. Total conversion through reactions alone were as high as 81% and 58% respectively.
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