Metal mobilization from municipal solid waste incineration bottom ash through metal complexation with organic and inorganic ligands |
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Authors: | Fumitake Takahashi Jiro Etoh Takayuki Shimaoka |
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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 Hydraulics, Transportation and Roads, University of Rome “La Sapienza”, Via Eudossiana 18, 00184 Rome, Italy;(3) Centre for Contaminated Land Remediation, University of Greenwich at Medway, Chatham Maritime, Kent, ME4 4TB, United Kingdom |
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Abstract: | As a first step in the development of ligand-assisted removal of heavy metals from municipal solid waste incineration bottom
ash under alkaline conditions, ammonium nitrate, ammonium sulfate, ammonium acetate, ammonium oxalate, ammonium citrate, urea,
and mixtures of ammonium salts and urea were examined to find which ligands could promote the leachability of elements, including
heavy metals, and which elements could be mobilized through complexation. Ammonium citrate promoted the mobilization of Cr,
Cu, Mn, P, Sb, and especially Fe. Ammonium nitrate accelerated Mg leachability significantly. Under the conditions used in
this study, counter anions seemed to contribute mainly to the complexation. When a mixture of ammonium citrate and urea was
utilized, a coexistence effect appeared on Fe mobilization. Although the correlation analysis of leaching test results showed
a strong correlation among Cr, Cu, Fe, Mn, and P, X-ray diffraction analysis partially supported the correlation between Fe
and Mn only. |
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