Abstract
Carbonation technology with CO 2 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 CO 2, was evaluated. The results indicated that the addition of 10% or more of water could remarkably accelerate the absorption of CO 2 and could also accelerate the stabilization of MSWI fly ash. The stabilization of MSWI fly ash is not distinct within 1 d in the air atmosphere for low content of CO 2 (0.03%). The result of the XRD analysis indicated that CO 2 could combine with Ca(OH) 2 to form CaCO 3 and CO 2 could also combine with heavy metal oxide to form heavy metal carbonate in the adsorption of CO 2. The TGA analysis showed that MSWI fly ash has the sequestration capability of 3% (w/w) CO 2. The sequestration of CO 2 has a large impact on Pb, and the exchangeable Pb can be converted into carbonated form in rich CO 2 condition to be stabilized.
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