Elution Suppression Treatment of Radioactive Cesium in Municipal Solid Waste Incineration Fly Ash Using Water-repellent Spray

Abstract

The water-repellent spray treatment without increasing volume was applied for suppressing the elution of radioactive cesium concentrated into the municipal solid waste incineration fly ash. The silane-based oligomer water-repellent was sprayed onto fly ash powder and cementitious fly ash to suppress the elution of radioactive cesium. The elution rate of radioactive cesium from treated fly ash by the Japanese leaching test No.13 was compared to that of non-treated fly ash. The elution rate of water-soluble radioactive cesium was suppressed significantly compared to the elution rate from non-treated fly ash. This method using commercially available water-repellent can be applied to reduce the elution of radioactive cesium from fly ash reclaimed into the landfilled site.