Desorption behaviour of polychlorinated dibenzo-p-dioxins/dibenzofurans on a packed fly ash bed

When incinerator fly ash is heated at 398 °C under a stream of N2/O2 polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF) concentrations are lowered. Dechlorination/dtx;omposition and desorption are competing processes. In this paper the desorption was studied: within PCDD/F homologues, all isomers desorb at an equal rate. Obviously, values of the activation energy of desorption from the fly ash surface (ΔG#398,des do not differ significantly between these isomers.