Cesium and Niobium transport through poorly cemented sandstone from Krasnoyarsk-26 (Russian Federation): From Batch to Transport experiments

Abstract

ABSTRACTWe have studied the sorption of Cs and Nb onto poorly cemented sandstone (drillcore from – 250 m depth) from the radioactive waste disposal site at Krasnoyarsk-26 (Russian Federation). Results were evaluated in terms of KD-values and Langmuir isotherms. These values have been used to model the transport of Cs and Nb through a sandstone column using the RETRASO code (REactive TRAnsport of Solutes), which is able to simulate simultaneously groundwater flow, heat transport and multicomponent reactive solute. Good agreement between experimental data and modeling has been achieved for both elements. Cs transport has been modeled using rapid sorption equilibrium, while for Nb a kinetically controlled transport has been considered. The results obtained in this work have been used to predict the 1D transport of Cs and Nb taking into account some parameters of the hydrogeology of Krasnoyarsk-26.