Clay colloid-associated transport of contaminants into the subsurface
- Kansas State Univ., Manhattan, KS (United States)
In addition to advective and diffusive transport of contaminants in the subsurface, clay colloid-associated transport in the shallow subsurface regions was recently found to provide a significant component. This study dealt with an assessment of clay colloid migration and the associated transport of contaminants from surface run-off into the subsurface. The study consisted of two phases of experimental investigations. In the first phase, a series of tests were conducted in permeameters on sandy soils of various densities. Suspensions of montmorillonite particles were introduced into the samples to obtain deposition profiles of montmorillonite particles. In the second phase, zinc was used as the sorptive contaminant in the influent. Breakthrough curves and zinc profiles in the soil sample were obtained. Results from these experiments were used to assess the impact of clay colloid-associated transport of contaminants on soil and groundwater quality under a range of in-situ conditions. Finally, an approach was outlined to model this transport mechanism. A sensitivity analysis was conducted to identify the effects of key parameters such as soil density, soil-contaminant interactive properties such as the distribution coefficient, and residence time of influent.
- OSTI ID:
- 490998
- Report Number(s):
- CONF-9406250--
- Country of Publication:
- United States
- Language:
- English
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