Abstract
Pozzolana cementation is shown to be beneficial for the immobilization of aqueous cadmium from ash materials. Waste ash was obtained from an aluminum smelter, coal-fired electric power generating plants (conventional and fluidized bed types), and incinerators fueled by sewage sludge and municipal refuse. Ash samples from a home wood stove fueled with scrap lumber and silica beach sand were obtained to provide a greater range of comparison. Ash and sand samples were subjected to intermittent flow-through leaching as loose samples and as their respective pozzolanas. The leachate collected was analyzed by flameless atomic absorption for cadmium. Cadmium availability to the environment prior to and at steadystate conditions was defined and quantified. Pozzolana reduction of cadmium leaching exceeded 90% for all ash samples.
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