Modeling Arsenite Adsorption on Rusting Metallic Iron
Publication: Journal of Environmental Engineering
Volume 136, Issue 4
Abstract
Experimental data on As(III) adsorption by rusted zero valent iron (ZVI) could be modeled using a simple Langmuir isotherm model. However, the adsorption equilibrium was observed to shift with time, as continued rusting produced additional sites on the rusted ZVI surface for potential arsenic adsorption. A modified Langmuir isotherm model was formulated taking into consideration the temporal variation in the site concentration for potential arsenic adsorption on the rusted ZVI surface. This model simulated the long-term experimental data on As(III) adsorption quite well. The model was further refined by apportioning the arsenic adsorbed on the rusted ZVI surface into labile and irreversibly adsorbed fractions. Finally, the developed model was used to simulate the performance of an adsorption column. The simulation results indicate that an adsorption column of length 0.4 m and diameter 0.056 m, i.e., containing of rusted ZVI weighing 4.76 kg, and operated at an empty bed contact time of 12 min, can treat 2,375–2,525 L of water containing of As(III) such that the effluent As(III) concentration from the column is less than .
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Information
Published In
Journal of Environmental Engineering
Volume 136 • Issue 4 • April 2010
Pages: 405 - 411
Copyright
© 2010 ASCE.
History
Received: Feb 18, 2009
Accepted: Sep 12, 2009
Published online: Oct 6, 2009
Published in print: Apr 2010
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