Effects of Microbial Community Structure, Terminal Electron Accepting Conditions, and Molybdate on the Extent of U(VI) Reduction in Landfill Aquifer Sediments
| Autor: | Anne M. Spain, Lee R. Krumholz, Aaron D. Peacock |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Chemistry Inorganic chemistry chemistry.chemical_element Sediment Electron donor Electron acceptor Uranium Molybdate Microbiology chemistry.chemical_compound Bioremediation Microbial population biology Environmental chemistry Earth and Planetary Sciences (miscellaneous) Environmental Chemistry Microcosm General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 28:430-443 |
| ISSN: | 1521-0529 0149-0451 |
| DOI: | 10.1080/01490451.2010.507643 |
| Popis: | Addition of an electron donor, such as ethanol, glucose, or acetate, to the subsurface in order to stimulate biological reduction of soluble U(VI) to insoluble U(IV) is an important strategy for uranium immobilization in contaminated aquifers. Electron donor addition typically results in anaerobic conditions and the respiratory process (sulfate-reducing, iron-reducing, and/or methanogenic) will depend on site geochemistry. Although previous studies have found that U(VI) reduction can occur under any of these conditions, the goal of this study was to examine the relative extent of U(VI) reduction under different geochemical conditions and the influence of the different microbial populations on the reduction process. Sulfate-reducing (SR), iron-reducing (FeR), and methanogenic (Meth) conditions were stimulated by electron donor addition in sediment batch microcosms, and 100 μM U(VI) was added upon depletion of alternate electron acceptors. Within seven days, 89, 96, and 66% of soluble U(VI) was immobilized ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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