SUMMARY: the central role of waste-to-energy (WtE) plants in Denmark asks for a deep knowledge of all different residues produced by these facilities. The main objective of solid residues characterization is the optimization of their management system. In this study we present the results of the first phase of a wider study about the solid residues produced at the heat recovery system (boiler) of a waste incineration plant. The characterization was carried out not on the total output of the boiler but on the different solid residues produced at ten different horizontal sections. The aim was to characterize the different streams in order to identify
differences that can justify potentially different utilization/disposal options. First results showed differences between sections in terms of chemical composition, leaching behavior and content of dioxins, but additional results are needed to cope with variability issues and before drawing conclusions.