Abstract
In order to clarify the leachability of cesium from bottom ash of municipal solid waste, sequential extraction, pH dependence test, and temperature dependence test were conducted. Bottom ash was obtained by incinerating RDF or wood chips to which stable cesium solution was added. It was found that the cesium fraction distribution pattern of bottom ash from wood chips except water soluble fraction was similar to that of actual bottom ash. Less than a pH of 5, cesium leaching ratio was largely increased with decrease in pH. Over a pH of 5, cesium leaching ratio was almost same as that at natural pH. Increase of cesium leaching ratio at 60°C was 1.2 times higher than that at 20°C in average. Therefore, the effect of pH and temperature on cesium leaching would be negligible in actual landfill conditions. Cesium in residual state would be present with aluminum and iron that were insoluble in reduction condition.
