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Journal of Porous Media

ISSN for PRINT: 1091-028X

Institutional price:	$713.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2006, Volume9

124 pages

Issue price - $155.00

Simulating Transport and Bioreduction of Cr(VI) by Employing the Dual-Enzyme Kinetic Model

Akram Hossain
Civil and Environmental Engineering, Washington State University, Richland, WA 99354

ABSTRACT

Cr(VI) contamination of soil and groundwater is considered a major environmental concern. Bioreduction of Cr(VI) to Cr(III) can be considered an effective technology in remediating Cr(VI) contaminated sites. Among the Cr(VI) reducing bacteria, Shewanella oneidensis MR-1 (MR-1) is relatively effective. Reduction of Cr(VI) by MR-1 is defined by a nonlinear zeroth-order dual-enzyme kinetic model. Existing models are not designed to simulate transport and bioreduction of Cr(VI) by employing the dual-enzyme kinetic model. The objective of this paper is to present a finite element model capable of simulating transport and bioreduction of Cr(VI) by employing the dual-enzyme kinetic model. The model developed is accurate and can provide oscillation free results when Pn ≤ 50, PnCn ≤ 5, and Cn ≤ 1 for continuous sources, with Pn and Cn as the Peclet and Courant numbers, respectively. For pulse sources, accurate model predictions are obtained when, Pn ≤ 20, PnCn ≤ 5 and Cn ≤ 1. The accuracy of the model predictions is also a function of the degree of reliability and certainty with which its kinetic parameters are estimated.