Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 161, Issue 2-3, Pages 1046-1051Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.04.051
Keywords
Accelerated carbonation technology (ACT); Municipal solid waste incinerator (MSWI); Fly ash; Heavy metal
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Funding
- National Natural Science Foundation China [50778099]
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Carbonation technology with CO2 absorption was used to enhance the stabilization of heavy metals in fresh fly ash from a municipal solid waste incinerator (MSWI). The influence of fundamental parameters affecting the stabilization of heavy metals, especially Pb and diffusivity and reactivity Of CO2, was evaluated. The results indicated that the addition of 10% or more of water could remarkably accelerate the absorption Of CO2 and could also accelerate the stabilization of MSWI fly ash. The stabilization of MSWI fly ash is not distinct within I d in the air atmosphere for low content Of CO2 (0.03%). The result of the XRD analysis indicated that CO2 could combine with Ca(OH)(2) to form CaCO3 and CO2 could also combine with heavy metal oxide to form heavy metal carbonate in the adsorption of CO2. The TGA analysis showed that MSWI fly ash has the sequestration capability Of 3% (w/w) CO2. The sequestration Of CO2 has a large impact on Pb, and the exchangeable Pb can be converted into carbonated form in rich CO2 condition to be stabilized. (C) 2008 Elsevier B.V. All rights reserved.
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