Investigation of Consolidation-Induced Solute Transport. I: Effect of Consolidation on Transport Parameters
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 9
Abstract
This paper presents an experimental investigation of the effect of clay consolidation on parameters that govern the advective-dispersive transport of an inorganic solute. Batch, diffusion, dispersion, and solute transport tests were conducted using kaolinite clay and dilute solutions of potassium bromide (KBr). Batch tests produced the highest levels of sorption and indicated that equilibrium sorption was achieved in approximately 10–30 min. The increase in sorption observed in the batch tests, as compared to the dispersion or solute transport tests, reflects the significantly lower solids-to-solution ratio and more efficient mixing process. By comparison, kaolinite consolidation had little effect on sorption due to the relatively small change in porosity. Values of hydrodynamic dispersion coefficient , effective diffusion coefficient , and apparent tortuosity factor decreased with decreasing porosity. Values of obtained for were generally larger than for , whereas values for were significantly smaller than for . Values of longitudinal dispersivity were larger for than and showed no clear trend with decreasing void ratio. In general, the experimental results suggest that changes in and should be taken into account during clay consolidation whereas the sorption isotherm and may be considered as unchanged during the consolidation process.
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Acknowledgments
Financial support for this investigation was provided by the U.S. National Oceanic and Atmospheric Administration through the Ohio Sea Grant College Program and is gratefully acknowledged. The writers also thank Dr. Charles D. Shackelford, Professor of Civil and Environmental Engineering at Colorado State University, for several insightful discussions regarding data interpretation for soil column tests and Franklin S. Jones, Research Assistant in the School of Environmental and Natural Resources at The Ohio State University, for performing the kaolinite CEC measurement.
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© 2009 ASCE.
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Received: Sep 9, 2007
Accepted: Jan 26, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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