Bacterial Perchlorate Reduction in Simulated Reverse Osmosis Rejectate |
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Authors: | T Giblin M E Losi V Hosangadi W T Frankenberger Jr |
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Institution: | 1. Department of Natural Sciences , Stephens College , Columbia, MO, 65215;2. Foster Wheeler Environmental Corporation , 1940 E. Deere Avenue, Santa Ana, CA, 92705 |
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Abstract: | Reverse osmosis (RO) is capable of removing perchlorate (ClO4 ?) from contaminated groundwater and producing potable effluent; however, RO does not destroy ClO4 ?, but collects it in a concentrated waste stream (rejectate) that must be treated or disposed of appropriately. A packed bed bioreactor, inoculated with the pure culture perclace, was tested for its ability to remove ClO4 ? from a simulated RO rejectate. Perchlorate concentrations were lowered from 5 mg/L to <0.004 mg/L with a residence time of 0.8 h. In addition, this system removed 98% of ClO4 ? from a twice-concentrated rejectate with an influent ClO4 ? concentration of 8 mg/L and a residence time of 2.0 h. In both experiments, nitrate (NO3 ?) was removed simultaneously with ClO4 ? from an initial concentration as high as 900 mg/L NO3 to below 4 mg/L. Despite the efficiency of ClO4 ? removal, the system suffered from clogging due to the high total dissolved solids (TDS) of the twice-concentrated rejectate. |
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Keywords: | Bioremediation bioreduction saline bioreactor perchlorate |
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