Experimental studies on the interaction of groundwater with bentonite

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:377935

Sasaki, Y; Shibata, M; Yui, M; Ishikawa, H ^[1]

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1. Power Reactor and Nuclear Fuel Development Corp., Tokai, Ibaraki (Japan)

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-V1 (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 ultrafiltration. Alteration of the distribution of exchangeable cation in the bentonite was analyzed by NH{sub 4}Ac and XRD. The results indicated that the interaction between bentonite (Kunigel-V1) 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.

• OSTI ID: 377935
• Report Number(s): CONF-941075--; ISBN 1-55899-253-7
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
AEROBIC CONDITIONS
ANAEROBIC CONDITIONS
BENTONITE
CALCITE
DISSOLUTION
EXPERIMENTAL DATA
GROUND WATER
HIGH-LEVEL RADIOACTIVE WASTES
ION EXCHANGE
MATHEMATICAL MODELS
MINERALOGY
OXIDATION
PYRITE
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE FACILITIES
ROCK-FLUID INTERACTIONS
SMECTITE
UNDERGROUND DISPOSAL