A large quantity of 131I has been widely used for the treatment of thyroid cancer with progress of nuclear medicine, and it gives a burden to facilities for treatment of the liquid waste containing 131I.
For the purpose of advanced treatment of liquid waste containing 131I and minimization of the burden of the facilities, iodine removal methods by ionexchange resin or activated carbon were attempted, however, it was found to be difficult to remove iodine from the liquid waste by these adsorbents.
This report describes the application of the activated carbon impregnating per-bromine ion with abilities of organic iodine removal by halogen substitution reaction in gas phase and organic solvent phase.
Removal experiments using the impregnated carbon towards several kinds of solution containing iodine were attempted. Removal efficiencies of the impregnated carbon become apparent as bellow.
•Higher removal efficiency and adsorption capacity were obtained by the impregnated carbon impregnating higher ratio of per-bromine ion.
•It was proved that 0.08g of iodine can be adsorbed byl g of the impregnated carbon.
•Removal efficiency and adsorption capacity of the impregnated carbon were far better than that of ionexchange resin or activated carbon.
As a result, it is clarified that the impregnated carbon is an adsorbent applicable to the iodine removal from actual liquid waste.
