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Since the discovery of perchlorate contamination in a number of California groundwatersin 1997, it has been detected in many other locations across the country. The UnitedStates Environmental Protection Agency (USEPA) estimates that groundwaters in 44states have the potential to be contaminated with perchlorate, and actual drinking watercontamination with this chemical has been documented in 14 states. Perchlorate (ClO4 -)appears to be linked to the historical manufacturing, usage, or processing of ammoniumperchlorate (NH4ClO4), a solid rocket fuel. In March 1998, the USEPA formally addedperchlorate to the drinking water contaminant candidate list (CCL).Its monitoring in drinking water supplies was mandated in 1999 under the UnregulatedContaminants Monitoring Rule (UCMR). The primary concerns overperchlorate toxicity include its known adverse effect on the thyroid gland, as well aspossible carcinogenic, developmental, reproductive, and immunotoxic effects.Theobjective of this study was to investigate the application of a novel hydrogen-fedfollow-fiber membrane biofilm reactor (MBfR) for the removal of perchlorate.During initial testing, it was discovered that a bench-scale MBfR was effective inreducing 50 to 1000 ug/L perchlorate to below the previous California Department ofPublic Health Services Advisory Action Level of 18-ug/L. At pilot-scale, the objectivewas to evaluate the application of a pilot-scale MBfR system to biologically reduce low-concentrationperchlorate-contaminated water from an active groundwater well. Includes 2 references, tables, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 7 File Size: 1 file , 220 KB