The effects of accelerated carbonation on CO2 uptake and metal release from incineration APC residues |
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| Authors: | Renato Baciocchi Giulia Costa Elisabetta Di Bartolomeo Alessandra Polettini Raffaella Pomi |
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| Institution: | 1. Department of Civil Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy;2. Department of Chemical Science and Technology, University of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Rome, Italy;3. Department of Hydraulics, Transportation and Roads, University of Rome “La Sapienza”, Via Eudossiana 18, 00184 Rome, Italy;1. Department of Civil and Environmental Engineering, University of Wisconsin, Madison, WI 53706, United States;2. Department of Civil, Construction, and Environmental Engineering, Iowa State University, Ames, IA 50011, United States;1. Department of Biological Geological and Environmental Sciences, University of Bologna, Bologna, Italy;2. VTT Technical Research Centre of Finland Ltd, Espoo, Finland;3. Aalto University, School of Chemical Technology, Espoo, Finland;1. School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Shanghai, 200444, PR China;2. Department of Civil, Construction and Environmental Engineering, Marquette University, Milwaukee, WI, 53233, United States;1. Chemical and Petroleum Engineering Department, UAE University, P.O. Box 15551, Al-Ain, United Arab Emirates;2. Zayed University, P.O. Box 144534, Abu Dhabi, United Arab Emirates;1. Competence Centre for Energy and Environmental Engineering, THM University of Applied Sciences, Wiesenstr. 14, 35390 Gießen, Germany;2. Soil Geography/Soil Science, Department of Geosciences, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, Germany |
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| Abstract: | This work presents the results of a study on accelerated carbonation of incinerator air pollution control residues, with a particular focus on the modifications in the leaching behaviour of the ash. Aqueous carbonation experiments were carried out using 100% CO2 at different temperatures, pressures and liquid-to-solid ratios, in order to assess their influence on process kinetics, CO2 uptake and the leaching behaviour of major and trace elements. The ash showed a particularly high reactivity towards CO2, owing to the abundance of calcium hydroxides phases, with a maximum CO2 uptake of ～250 g/kg. The main effects of carbonation on trace metal leaching involved a significant decrease in mobility for Pb, Zn and Cu at high pH values, a slight change or mobilization for Cr and Sb, and no major effects on the release of As and soluble salts. Geochemical modelling of leachates indicated solubility control by different minerals after carbonation. In particular, in the stability pH range of carbonates, solubility control by a number of metal carbonates was clearly suggested by modelling results. These findings indicate that accelerated carbonation of incinerator ashes has the potential to convert trace contaminants into sparingly soluble carbonate forms, with an overall positive effect on their leaching behaviour. |
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