Demobilisation of critical contaminants in four typical waste-to-energy ashes by carbonation |
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Authors: | Todorovic Jelena Ecke Holger |
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Institution: | 1. Dipartimento di Chimica, Università di Pavia, via Taramelli 12, 27100 Pavia, Italy;2. College of Environmental Science and Engineering, Anhui Normal University, South Jiuhua Road 189, Wuhu 241002, Anhui, China;3. Department of Applied Mathematics, Escola Politècnica Superior, Universitat de Girona, Avda. Maria Aurèlia Capmany, 61, 17003 Girona, Spain;4. Chemical Engineering Department, Escola Politècnica Superior, Universitat de Girona, Avda. Maria Aurèlia Capmany, 61, 17003 Girona, Spain |
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Abstract: | Two bottom ashes, one air pollution control (APC) residue and one fly ash from three different Swedish municipal solid waste incineration (MSWI) plants were characterised regarding the leaching of environmentally relevant components. Characterisation was performed using a diffusion tank leaching test. The impact of carbonation on the release of eight critical components, i.e., Cl(-), Cr, Cu, Mo, Pb, Sb, Se, SO(4)(2-) and Zn, was assessed at a lab-scale and showed carbonation to have a more pronounced demobilising effect on critical components in bottom ashes than in APC residue and fly ash. From grate type incinerator bottom ash, the release of Cr decreased by 97%, by 63% for Cu and by 45% for Sb. In the investigated APC residue, the releases of Cr, Se and Pb were defined as critical, although they either remained unaffected or increased after carbonation. Cl(-) and SO(4)(2-) remained mobile after carbonation in all investigated residues. |
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