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Biological Treatment at Low Concentrations in Water - Phase 1San Gabriel, CASource: Catts, John J., 1998. "Biological Treatment of Perchlorate at Low Concentrations in Water" Presentation from Perchlorate Stakeholder's Forum, held May 19-21, 1998, Henderson, Nevada, available at http://www.epa.gov/safewater/ccl/perchlor/tab2.html. Project Summary: The following text was excerpted from Catts, John J., 1998. "Biological Treatment of Perchlorate at Low Concentrations in Water" Presentation from Perchlorate Stakeholder's Forum, held May 19-21, 1998, Henderson, Nevada, available at http://www.epa.gov/safewater/ccl/perchlor/tab2.html: Treatability studies were conducted to evaluate treatment of water containing 50 to 100 ug/L perchlorate and 4 to 6 mg/L nitrate to determine whether perchlorate effluent concentrations of 18 ug/L or lower can be achieved. The treatment technology evaluated was an attached-growth fluidized bed bioreactor (FBR), with granular activated carbon (GAC) media. Nutrient (N and P) and organic substrate (ethanol) addition via feed systems are an integral part of the treatment system. Testing took place in December 1997 through mid March 1998. Perchlorate destruction versus influent dissolved oxygen, dissolved oxygen, nitrate, and ethanol reactor profiles, and phosphorous concentrations were closely examined. Conclusions were that the FBR technology can treat low concentrations of perchlorate; treated water contained <4 ug/L perchlorate and <0.1 mg/L nitrate; alternative microorganisms can be utilized; and the effluent could be rendered potable after disinfection and filtration. Additional conclusions were that there was an observed preference for nitrate; the ethanol substrate was not detected in produced water; only minimum phosphorous is required; dissolved oxygen and redox potential can be used as operational controls; the retention time can be adjusted by equipment configuration and recycle, and no VOC reduction products were detected. Additional Info Source: Catts, John J., 1998. "Biological Treatment of Perchlorate at Low Concentrations in Water" Presentation from Perchlorate Stakeholder's Forum, held May 19-21, 1998, Henderson, Nevada, available at http://www.epa.gov/safewater/ccl/perchlor/tab2.html. |
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