Radioactive cesium found in municipal solid waste incineration (MSWI) fly ash can be easily eluted through contact with environmentally sourced water, such as rainwater. Dissolution suppression treatment of radioactive cesium, such as through cement solidification or geopolymer solidification, has been previously studied. Treatment through solidification requires the addition of a fixation agent, which results in an increase in the volume of fly ash following solidification. It is likely that the level of security at the landfill site will be high. In an attempt to simply suppress the elution of water-soluble radioactive cesium from MSWI fly ash without an increase in volume, we examined a water-repellent treatment method using four types of water repellents. Our results indicate that when the incinerated fly ash is impregnated and mixed with a commercially available water repellent, such as a silane-based oligomer, an alkyl alkoxysilane compound, or a fatty acid, it is possible to suppress the elution of radioactive cesium without a corresponding increase in fly ash volume.

通过与环境水（如雨水）接触，可轻松洗脱市政固体垃圾焚烧（MSWI）粉煤灰中发现的放射性铯。先前已经研究了放射性铯的溶解抑制处理，例如通过水泥固化或地质聚合物固化。通过固化处理需要添加固定剂，这导致固化后粉煤灰的体积增加。垃圾填埋场的安全级别可能很高。为了简单地抑制MSWI粉煤灰中水溶性放射性铯的洗脱而不增加体积，我们研究了使用四种类型的防水剂的防水处理方法。