Determination of porewater chemistry in compacted bentonite
Conference
·
OSTI ID:572231
- VTT Chemical Technology (Finland)
- VTT Communities and Infrastructure (Finland)
Laboratory experiments were performed to study the interaction between groundwater and compacted sodium bentonite (Volclay MX-80). The solutions used were the fresh and saline groundwater simulants. The experiments were carried out in aerobic and anaerobic conditions at elevated temperature. Of main interest in the present study were the chemical changes in the reacting solution, bentonite porewater, and bentonite itself. The results for major cations display a principal difference between the interactions with fresh and saline solutions, while the differences between aerobic and anaerobic conditions within each solution case seem to be minor. The experimental results for the bentonite-water equilibria were interpreted in terms of a multi-site surface complexation model and the computer program HYDRAQL. The apparent diffusivities for sodium and sulfate in bentonite samples sandwiched between two filter plates were also determined.
- OSTI ID:
- 572231
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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