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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 28, 2004
Accepted November 23, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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A Simple Mathematical Analysis on the Effect of Sand in Cr(VI) Reduction using Zero Valent Iron

Dong-Ik Song^† Young Hun Kim¹ Won Sik Shin²

Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea ¹Department of Environmental Engineering, Andong National University, Andong 760-749, Korea ²Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea

disong@knu.ac.kr

Korean Journal of Chemical Engineering, January 2005, 22(1), 67-69(3), 10.1007/BF02701464

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Abstract

A simple mathematical model was proposed to analyze the enhancement of Cr(VI) reduction when sand materials are added to the zero valent iron (ZVI). Natural decay of Cr(VI) in a control experiment was analyzed by using a zero-order decay reaction. Adsorption kinetics of Cr(VI) to sand was modeled as a first-order reversible process, and the reduction rate by ZVI was treated as a first-order reaction. Natural decay of Cr(VI) was also included in other experiments, i.e., the adsorption to sand, the reduction by ZVI, and both adsorption and reduction when sand and ZVI are present together. The model parameters were estimated by fitting the solution of each model to the corresponding experimental data. To observe the effect of sand addition to ZVI, both adsorption and reduction rate models were considered simultaneously including the natural decay. The solution of the combined model was fitted to the experimental data to determine the first-order adsorption and reduction rate constants when sand as well as ZVI is present. The firstorder reduction rate constant in the presence of sand was about 35 times higher than that with ZVI only.

Keywords

Zero Valent Iron (ZVI) Cr(VI) Reduction Adsorption Rate Reduction Rate Effect of Sand

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