Dissimilatory Iron-Reducing Bacteria Can Influence the Reduction of Carbon Tetrachloride by Iron Metal

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• 作者：Robin Gerlach ; Al B. Cunningham ; and Frank Caccavo ; Jr.
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：June 15, 2000
• 年：2000
• 卷：34
• 期：12
• 页码：2461 - 2464
• 全文大小：55K
• 年卷期：v.34,no.12(June 15, 2000)
• ISSN：1520-5851

文摘

Little is known about the long-term performance ofzerovalent iron (Fe⁰) subsurface barriers. Groundwaterexposure induces corrosion processes that can passivatethe Fe⁰ surface and decrease barrier reaction rates. Wepresent evidence that dissimilatory iron-reducing bacteria(DIRB) can stimulate the rate of carbon tetrachloride(CT) transformation in the presence of corroded iron. TheDIRB, Shewanella alga BrY, adhered to the corroded Fesurfaces that showed little or no capacity to transform CT.The addition of BrY to these systems with decreased CTtransformation rates resulted in increased ferrous ironconcentrations and increased CT transformation to chloroform(CF). The results suggest that DIRB can have an influenceon the long-term performance of Fe⁰ barriers.