ENVR 62 |
| Nitrate and perchlorate concentrations in many drinking water sources exceed their respective EPA maximum contaminant level of 10 ppm nitrate and reference dose drinking water equivalent level of 24.5 ppb perchlorate. Ion exchange has been found to be an effective means of removing these contaminants from water, but suffers from several drawbacks including leakage and excessive waste brine required for regeneration. We report the performance of ion exchange fibers (IEFs) designed with strong base anion exchange groups for the selective removal of these two anions from water. Selectivity for nitrate removal is shown to be a function of the particular alkyl amine functionality in the fiber. Breakthrough tests show an improvement in removing nitrate in water to levels well below the EPA limit using IEF filters relative to conventional materials. IEFs can be regenerated far more quickly, resulting in a decrease in brine required for regeneration. |
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Advances in Adsorption Processes for Drinking Water Treatment and Sourcewater Protection
8:30 AM-9:35 AM, Monday, April 7, 2008 Morial Convention Center -- Rm. 236, Oral
Division of Environmental Chemistry |