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IN-PLACE REGENERATION OF SVE LOADED GAC USING FENTON'S REAGENTS
Citation:
De Las Casas, C. L., K. G. Bishop, L. M. Bercik, W. P. Ela, A. E. Saez, S G. Huling*, AND R. G. Arnold. IN-PLACE REGENERATION OF SVE LOADED GAC USING FENTON'S REAGENTS. Presented at 228th ACS Nat'l. Mtg, Philadelphia, PA, August 22 - 26, 2004.
Impact/Purpose:
To inform the public.
Description:
Ten out of the 25 most frequently detected groundwater contaminants at hazardous waste sites are chlorinated volatile organic compounds (VOCs) 1 . Trichloroethylene (TCE) and tetrachloroethylene (PCE) are among the top three 1 . Granular activated carbon (GAC) adsorption is widely used to remove VOCs from both liquid and gas streams at such sites. However, carbon adsorption does not destroy the toxic, and GAC must be regenerated or replaced when loaded to capacity. Advanced oxidation processes (AOP) are also widely employed in the remediation of sediment and groundwater contaminated with VOCs 2-4 . AOPs have the advantage of directly destroying the contaminant but are expensive for treatment of low concentration streams. In Fenton's reaction, an AOP process, reaction of hydrogen peroxide with iron generates the hydroxyl radicals (?OH) that are capable of degrading a wide variety of VOCs 5-6 . If well designed, Fenton-dependent processes can mineralize even heavily halogenated targets such as PCE and TCE 7 . This study assesses the feasibility of Fenton's reaction as an in-place chemical regeneration process for GAC. Methods are investigated for enhancing the rate of Fenton-dependent regeneration of halogenated VOC-loaded GAC. In addition, the potential application of this technology to GAC-Soil Vapor Extraction (SVE) systems is examined.