[2B15-19] Fukushima Daiichi NPT Accident Waste Treatment 8

[2B16] Adsorption characteristics of cesium on sodium titanosilicate in washing solution of cesium-enriched fly ash

*Tsuneki Ichikawa^1,2, Kazuo Yamada², Takashi Sakuma³, Shinsuke Miyabe⁴ (1. Hokkaido Univ., 2. NIES, 3. EBARA Co., 4. Nippon Chem.)

Keywords:sodium titanosilicate, cesium removal, fly ash, Fukushima Dai-ich nuclear accident

The Cs adsorption characteristics of sodium titanosilicate were measured in the spent washing solution of Cs-enriched fly ash that was generated by pyroprocessing decontamination of ¹³⁷Cs-contaminated waste. It was revealed that coexisting potassium ions strongly suppressed the adsorption of cesium, though sodium ions moderated the suppression effect. To use the titanosilicate as a Cs adsorbent in ion chromatographic decontamination of the washing solution was estimated to reduce the weight of the radioactive waste to 1/10,000 of the original one.