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Experimental Studies on the Interaction of Groundwater with Bentonite

Published online by Cambridge University Press:  15 February 2011

Y. Sasaki ,
M. Shibata ,
M. Yui  and
H. Ishikawa
Y. Sasaki
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Ibaraki-ken, 319–11, Japan
M. Shibata
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Ibaraki-ken, 319–11, Japan
M. Yui
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Ibaraki-ken, 319–11, Japan
H. Ishikawa
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Ibaraki-ken, 319–11, Japan
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Abstract

Interactions of sodium bentonite with distilled water and two types of synthetic groundwater were studied by batch experiments. In the experiments, clay and pure minerals were reacted at room temperature under aerobic and anaerobic condition as a function of time and liquid/solid ratio. The clay and pure minerals used in the experiments were Kunigel-VI (crude Na-bentonite), Kunipia F(purified Na-bentonite), purified Na-smectite(purified from Kunipia F), calcite and pyrite as accessory minerals. The chemical composition in the liquid phase was analyzed through centrifugation and ultra filtration. Alteration of the distribution of exchangeable cation in the bentonite was analyzed by NH4Ac and XRD. The results indicated that the interaction between bentonite(Kunigel-Vl) and groundwater under aerobic condition was described by ion exchange reaction of smectite, dissolution of calcite and oxidation of pyrite.

From these experimental studies, the model of the interaction of groundwater with bentonite proposed by Wanner was modified. The comparison between calculation and experimental results showed good agreement and indicated that this model could be adopted to predict porewater chemistry of bentonite for performance assessment of geological isolation system of high level waste.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 337
Copyright
Copyright © Materials Research Society 1995

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References

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