Mineralogy and leachability of gasified sewage sludge solid residues

► Study of the solid residue's characterization, solids resulting from sewage sludge gasification. ► Multi-technique approach is used to study the evolution of the mineralogy including innovative methods. ► Sewage sludge mineralogy undergoes significant transformations during thermal treatment, influenced mainly by temperature and heating atmosphere. ► Heavy metals are differently stabilized and located. ► Steam gasification is an attractive route for sewage sludge disposal in view of the mobility of heavy metals retained in the residues.