Basic research programs of vitrification technology for waste volume reduction, 95; Investigation of the decomposition and reuse of the spent adsorbent for extraction chromatography technology

Miyazaki, Yasunori  ; Sano, Yuichi   ; Takeuchi, Masayuki ; Arai, Tsuyoshi*; Kim, S.-Y.*; Wu, H.*; Miwa, Misako*; Matsuyama, Shigeo*

Separation of minor actinides (MA; Am, Cm) is social demand to reduce the volume and toxicity of radioactive waste generated by spent nuclear fuel reprocessing. We have proposed extraction chromatography that employs the TEHDGA-impregnated adsorbent in a separation column. From the previous study, MA recovery from the real radioactive waste liquid was achieved, and a flowsheet study is continued to improve the product purity (or decontamination coefficient). On the other hand, we are also investigating the decomposition and reuse of spent adsorbent. In this presentation, both of the degradability of the adsorbent by the Fenton reaction and the reusability of the re-impregnated adsorbent from the batch-wise adsorption test results are reported by the element distribution by micro-PIXE analysis.