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By analyzing soil and aqueous samples from a laboratory column study, scientists from several universities and Pacific Northwest National Laboratory (PNNL) assessed how the addition of small amounts of nanoparticulate goethite to sediment affects biostimulation processes. The study focused on microbial composition and dynamics involved in uranium remediation, especially as related to the bioavailability of Fe(III) phases and in the presence of sulfate-containing groundwater. The sediment was obtained from a uranium-contaminated former Uranium Mill Tailings Remediation Action (UMTRA) site located at Rifle, Colorado. Field studies and laboratory research were conducted to determine the underlying biogeochemical process involved in attenuation of soluble uranium from the aquifer upon biostimulation of metal-reducing bacteria. Biostimulation was achieved by injecting acetate, an electron donor, into the Rifle aquifer.

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Document Title: The Dynamics of Dirt
Category: EMSL (William R. Wiley Environmental Molecular Sciences Laboratory)
Media Type: Graphics
Date of Image/Photo: July 2010
Background: See http://www.emsl.pnl.gov/news/viewArticle.jsp?articleId=114
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/DRAE-87RKYP

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