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The City of Glendale, California has been leading a research program to identify effectivehexavalent chromium treatment technologies for impacted groundwater wells. The researcheffort to date has involved a range of funding agencies and organizations, university partners,and local cities. This work has been supported by the U.S. Environmental Protection Agency (USEPA), State of California, AwwaRF, and theCities of San Fernando, Burbank, and Los Angeles. University partners have included Utah StateUniversity, University of California at Los Angeles (UCLA), University of Colorado at Boulder, Wellesley College, and LehighUniversity. This extensive university and multi-organizational support has enabled theinvestigation of the mechanism of hexavalent chromium removal by a new treatment technologyapplication, weak-base anion exchange.In early pilot studies, weak-base anion exchange resin demonstrated a high capacity forhexavalent chromium. Initial technology testing, however, revealed a few hints that the reductionof hexavalent chromium to trivalent chromium occurred on at least one weak-base resin, but noton strong-base resins. Another research group also observed the high capacity of a weak-baseresin for chromium and hypothesized that chromium reduction occurred (H?ll et al. 2002),although no evidence of this mechanism was provided. The appearance of this possiblechromium reduction process coupled with the high chromium capacity of the weak-base resin ledthe project team to investigate the mechanism of chromium retention by the resins. Includes 7 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 10File Size: 1 file , 1.4 MB