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Transport of Radionuclides by Conncentrated Brine in a Porous Medium with Micropore-Macropore Structure

Published online by Cambridge University Press:  28 February 2011

S. Majid Hassanizadeh
S. Majid Hassanizadeh*
Affiliation:
National Institute for Public Health and Environmental Hygiene(RIVM), P.O. Box 150, 2260 AD LeidschendamThe Netherlands
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Abstract

This work concerns itself with the study of effects of soil aggregation and high salt concentrations on the transport of radionuclides by concentrated brine flowing through an aggregated porous medium. The medium is considered to be composed of porous rock aggregates separated by macropores through which the brine flows and transport of salt and radionuclides takes place. The aggregates contain dead-end pores, cracks, and stationary pockets collectively called micropores. The micropore space does not contribute to the flow, but it serves as a storage for salt and radionuclides. Adsorption of radionuclides takes place at internal surfaces of aggregates where we assume that a linear equilibrium isotherm describes the process.

A one-dimensional numerical model is developed which is based on two sets of equations: one set for the flow and transport of salt and another set for transport of radionuclides. Results of numerical experiments clearly indicate that that. the existence of high salt concentrations markedly reduces the peak of nuclides concentration and slows down their movement. Also, it is found that diffusive mass exchange between macropores and aggregates results in a pronounced lowering of the radionuclides concentration peaks.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 757
Copyright
Copyright © Materials Research Society 1987

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References

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