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Study of the sorption and modelling of cesium by a Brazilian bentonite using PHREEQC

Published online by Cambridge University Press:  27 January 2020

Clédola C. O. de Tello ,
Daisy M. M dos Santos  and
Thais B. Teixeira
Clédola C. O. de Tello*
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, Brazil
Daisy M. M dos Santos
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, Brazil
Thais B. Teixeira
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, Brazil
*
*(Email: tellocc@cdtn.br)
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Abstract

To estimate the cesium sorption by the bentonite and to obtain the isotherms, some batch-adsorption experiments are being carried out, being the Kd (retardation coefficient) calculated from these isotherms. One-dimensional flow cell was constructed to measure the bentonite permeability regarding to a cesium solution, which results will be used to evaluate the diffusion coefficient – D. It will be used the PHREEQC software to model the transport of the cesium radionuclide through this bentonite with the Kd and D data. The modelling of radionuclide transport in the Brazilian materials will contribute to evaluate the efficiency of multi-barriers system of the national repository, because it is one of its safety criteria.

Keywords

barrier layerCsstoragewaste managementabsorption
Type
Articles
Information
MRS Advances , Volume 5 , Issue 5-6: Scientific Basis for Nuclear Waste Management XLIII , 2020 , pp. 245 - 252
Copyright
Copyright © Materials Research Society 2020

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References

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