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Effects of Nonequilibrium Adsorption on Nuclide Transport in a Porous Rock

Published online by Cambridge University Press:  25 February 2011

Shi-Ping Teng  and
Ching-Hor Lee
Shi-Ping Teng
Affiliation:
National Tsing-Hua University, Department of Nuclear Engineering, Hsinchu, Taiwan
Ching-Hor Lee
Affiliation:
Radwaste Administation, Atomic Energy Council, Taipei, Taiwan
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Abstract

An analytical solution covering the entire range of adsorption properties of rock has been derived for the migration of radiionuclide in a porous rock matrix. The analysis takes into account the advective transport, hydrodynamic dispersion, adsorption between solid phase and liquid phase, and the radioactive decay. For adsorption of nuclide within the rock, the effects of no adsorption, linear nonequilibrium adsorption, and linear equilibrium adsorption are integrated into a generic transient analytical solution. The results indicate that the assumption of equilibrium adsorption can result in underestimation of the concentration profile in the early stages of migration. However, both the equilibrium and nonequilibrium profiles eventually approach the same value. It is also noted that for the case of nonequilibrium adsorption, plateaus appear in the concentration profile of the breakthrough curves. The effects of different adsorption rates are also analyzed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 739
Copyright
Copyright © Materials Research Society 1994

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References

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