Selective uptake and recovery of Cs, Pd, Re and Mo from simulated high level radioactive liquid waste solution by column loaded with hybrid microcapsules

Onishi, Takashi  ; Obayashi, Hiroshi ; Koyama, Shinichi  ; Mimura, Hitoshi*

Hybrid microcapsule (MCs) is composed of carrier matrix and extractants and form granulated composite, so that it is suitable for the practical column operation. Previous studies revealed the uptake behaviors of various metal ions on MCs. In this study, the selective uptake and recovery from simulated high level radioactive liquid waste solution (HLLW) were examined. Firstly, the uptake experiments of Cs, Pd, Re substitute for Tc and Mo were carried out by batch method using seven kinds of MCs. As a result, the uptake rates for all MCs were more than 96.9 %. Secondly, the column separation experiments were conducted with four MCs for the separation of Cs, Pd, Re and Mo, respectively. The results indicate the strong affinity of Cs, Pd and Re on each microcapsule, and it is demonstrated that the selective uptake and recovery from simulated HLLW by column method with MCs, and their availability was revealed for the treatment of HLLW.