Zero-Valent Iron Colloid Emplacement in Sand Columns
Publication: Journal of Environmental Engineering
Volume 123, Issue 5
Abstract
Studies were conducted to evaluate a novel approach of emplacing chemically reactive barriers composed of zero-valent iron (Fe0) by injecting suspensions of colloidal-size Fe0 particles into porous media. The specific objective of this study was to evaluate the effect of influent colloid concentration, rate, and volume of colloidal suspensions on Fe0 colloid emplacement in sand columns. Relatively even distributions of Fe0 throughout a sand column were obtained at low influent colloid concentrations and high injection rates. As the concentration of influent suspension was increased, a point was reached beyond which a significant increase in the filtration of Fe0 particles near the front of the column was observed. This point was also found to occur at lower influent colloid concentrations as the injection rate was decreased, i.e., there was an interactive effect of influent colloid concentration and injection rate on the extent of filtration that occurred near the front of the column. As the volume of the colloidal suspension injected into the column was increased, the distribution of Fe0 colloids within the column became increasingly even.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 5 • May 1997
Pages: 499 - 505
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: May 1, 1997
Published in print: May 1997
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