Bioremediation of Perchlorate-Contaminated Groundwater Using a Packed Bed Biological Reactor |
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Authors: | M E Losi T Giblin V Hosangadi W T Frankenberger Jr |
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Institution: | 1. Center for Environmental Microbiology , 1960 Chicago Ave D-15, Riverside, CA, 92705;2. Foster Wheeler Environmental Corporation , 1940 E. Deere Avenue, Santa Ana, CA, 92705;3. Department of Natural Sciences , Stephens College , Columbia, MO, 65215;4. Dept. of Environmental Science , Univ. of California , Riverside |
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Abstract: | The objective of this study was to assess the efficacy of a bench-scale, acetate-fed, packed bed bioreactor (PBR) to treat low concentrations (>1 mg L?1) of perchlorate (ClO4 ?) in groundwater collected from an impacted site. The PBR consisted of a cylindrical plexiglass column packed with Celite, a diatomaceous earth product, as a solid support medium. The reactor was inoculated with a ClO?4 ?-reducing bacterial isolate, perclace. Results showed that with influent ClO4 ? concentrations of approximately 800 μg L?1, nondetectable effluent concentrations (>4 μg L?1) were achieved with the PBR/perclace system at residence time as low as 0.3 h. Influent acetate concentrations of less than 500 mg L?1 yielded nondetectable effluent ClO? 4 concentrations, and acetate concentrations generally less than 50 mg L?1 were present in the effluent. Nitrate (NO? ?3) was also removed in this system, while sulfate (SO4 2?) reduction was not observed. The pH remained relatively constant during the process. |
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Keywords: | perchlorate bioreactor groundwater bacterial reduction bioremediation |
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