Comparative study of Sr adsorbents for radioactive contaminated water on severe accident

シビアアクシデントで発生する放射性汚染水の除染に向けたSr吸着剤の性能比較

高畠 容子  ; 柴田 淳広  ; 野村 和則  

Takahatake, Yoko; Shibata, Atsuhiro; Nomura, Kazunori

The radioactive contaminated water has accumulated at Fukushima Dai-ichi Nuclear Power Station after the severe damage by the events accompanying the earthquake and tsunami. The concentration of Ca in the accumulated water is higher than that of Sr. Because of their chemical similarity, the secondary radioactive waste from Sr decontamination process will contains Ca more than Sr. Therefore, the volume of the secondary waste will increase more unnecessarily. Three kinds of Sr adsorbents; SW-KAZLS, the Hydrous titanic acid and SrTreat, were characterized and assessed from the viewpoint of Sr decontamination for radioactive contaminated water. The amount of Sr in SW-KAZLS showed the highest Sr selectivity. Since the Hydrous titanic acid was the hardest adsorbent of three, it is applied well to adsorption tower. The amount of Sr in SrTreat was favorable, and it could be applied to decontamination for the radioactive contaminated water of low Sr concentration.