Separation of Cs-Sr through Ultrafiltration

Abstract

Complexation - ultrafiltration is a new technique which can be used for the absolute separation of trace elements. We have attempted to separate a mixed metal system to their individual components using the technique. The isotopes (Cs-137 and Sr-90) are required to be isolated from the discharge streams for safe discharge. Chemical co-precipitation is presently practised but the method has many challenges. Ultrafiltration has been demonstrated to be effective but not much work has been reported. The first in the series of proposed studies, reported here aims at the demonstration of the potential of UF not only in the isolation of the trace contaminants but also in separating them. The results indicate that Cs can be effectively separated at pH6.5 as a ferrocyanide colloid and Sr as carbonate at pH9. The relative advantage of using UF over the chemical co-precipitation has been discussed.