Effects of nonequilibrium adsorption on nuclide transport in a porous rock
- National Tsing-Hua Univ., Hsinchu (Taiwan, Province of China)
- Radwaste Administration, Taipei (Taiwan, Province of China)
An analytical solution covering the entire range of adsorption properties of rock has been derived for the migration of radionuclide 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.
- OSTI ID:
- 47918
- Report Number(s):
- CONF-931108--Vol.333; CNN: Contract NSC-83-0413-E-007-070
- Country of Publication:
- United States
- Language:
- English
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