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Understanding the Influence of Spatially Varying Retardation Effect on the Solute Transport

Published online by Cambridge University Press:  01 February 2011

Yuichi Niibori ,
Satoko Shimoda ,
Kouichi Tanaka  and
Osamu Tochiyama
Yuichi Niibori
Affiliation:
Department of Quantum Science and Energy Engr., Graduate School of Engr., Tohoku University, Aobayama 01, Aoba-ku, Sendai, JAPAN 980–8579
Satoko Shimoda
Affiliation:
Department of Quantum Science and Energy Engr., Graduate School of Engr., Tohoku University, Aobayama 01, Aoba-ku, Sendai, JAPAN 980–8579
Kouichi Tanaka
Affiliation:
Department of Quantum Science and Energy Engr., Graduate School of Engr., Tohoku University, Aobayama 01, Aoba-ku, Sendai, JAPAN 980–8579
Osamu Tochiyama
Affiliation:
Department of Quantum Science and Energy Engr., Graduate School of Engr., Tohoku University, Aobayama 01, Aoba-ku, Sendai, JAPAN 980–8579
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Abstract

A two-dimensional approach to understanding the heterogeneity in retardation effect governing the solute transport was carried out. To express the simplified spatial distribution of retardation effect, this study prepared parallel flat boards packed with two kinds of solid materials, where these materials were not mixed, but arranged as two kinds of the layers in a direction parallel to the flow. The ratio of the width of the constituent layer to the total transport distance was assumed to be one of key parameters describing the solute release profile transported through the media. As a tracer, Eu3+ in HNO3 solution was used, and its breakthrough curve was monitored in the experiments. In order to determine the retardation coefficient of the each layer, the retardation coefficients was obtained from the separate column experiment. Moreover, the permeabilities of both layers were confirmed to be almost identical from the one-dimensional, column experiments. A mathematical model was constructed to express the two-dimensional advection and dispersion of the solute through the media with the distribution of retardation effect. The proposed mathematical model and the experimental results showed good agreements, and indicated that the solute release profile strongly depended on the ratio of the width of the constituent layers to the total transport distance and the standard deviation of the retardation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 645
Copyright
Copyright © Materials Research Society 2004

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References

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