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Microbial Reduction of Iron Oxides and Removal of TCE using the Iron Reduced by Iron Reducing Bacteria  

Shin, Hwa-Young (Department of Civil Engineering, Hanyang University)
Park, Jae-Woo (Department of Civil Engineering, Hanyang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.2, 2005 , pp. 123-129 More about this Journal
Abstract
In situ permeable reactive barrier (PRB) technologies have been proposed to reductively remove organic contaminants from the subsurface environment. The major reactive material, zero valent iron ($Fe^0$), is oxidized to ferrous iron or ferric iron in the barriers, resulting in the decreased reactivity. Iron-reducing bacteria can reduce ferric iron to ferrous iron and iron reduced by these bacteria can be applied to dechlorinate chlorinated organic contaminants. Iron reduction by iron reducing bacteria, Shewanella algae BrY, was observed both in aqueous and solid phase and the enhancement of TCE removal by reduced iron was examined in this study. S. algae BrY preferentially reduced Fe(III) in ferric citrate medium and secondly used Fe(III) on the surface of iron oxides as an electron acceptor. Reduced iron formed reactive materials such as green rust ferrihydrite, and biochemical precipitation. These reactive materials formed by the bacteria can enhance TCE removal rate and removal capacity of the reactive barrier in the field.
Keywords
Trichloroethylene; Dechlorination; Iron Oxide; Iron Reducing Bacteria; Shewanella Algae BrY;
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