Selenium Reduction by Batch Cultures of Escherichia coli Strain EWB32213
Publication: Journal of Environmental Engineering
Volume 143, Issue 6
Abstract
Batch studies on selenium reduction were conducted to assess the reduction rate of Se(VI) as well as Se(IV) using Escherichia coli Strain EWB32213 isolated in the laboratory. The rate of Se(VI) reduction to Se(IV) in the first stage was faster than that of Se(IV) reduction to Se(0) in the second stage. The Se(VI) reduction was complete within 1.5 days, with the Se(VI) concentration ranging from 10 to , while a Se(IV) concentration higher than was only partially reduced to Se(0) after 10 days. The batch culture was capable of reducing Se(VI) and Se(IV) upon Se(VI) and Se(IV) respikes, albeit at decreasing rates. The data were successfully analyzed with a two-stage kinetic model using both the Simplex and Universal Global algorithms embedded in a computer program package. Eight biokinetic parameters of of , of , of , of , of , of , of Se(VI), and of Se(IV) were obtained. The good fit of the data to the model simulation indicated the robustness and rigorousness of the model.
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Acknowledgments
This research was supported by funds from the Kentucky Water Resources Research Institute and a teaching assistantship from the Department of Civil Engineering at the University of Kentucky. The authors also like to thank Brian D. Summer for providing coal slurry pond sediment samples. Assistance on parameter optimization by Dr. Evans M. N. Chirwa is also acknowledged.
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 31, 2016
Accepted: Sep 22, 2016
Published ahead of print: Feb 15, 2017
Published online: Feb 16, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 16, 2017
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