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RADON REMOVAL USING POINT-OF-ENTRY WATER TREATMENT TECHNIQUES
Citation:
Kinner, N., J. Malley, Jr., AND J. Clement. RADON REMOVAL USING POINT-OF-ENTRY WATER TREATMENT TECHNIQUES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-90/047.
Description:
The purpose of this EPA Cooperative Agreement was to evaluate the performance of POE granular activated carbon (GAG), and diffused bubble and bubble place aeration systems treating a ground water supply containing radon (35,620 + or - 6,717 pCi/L. he pattern of loading to the units was designed to simulate daily demand in a household. ach of the systems was evaluated with respect to three primary factors: radon removal efficiency, potential problems, and economics. he radon removal efficiencies of the POE GAC units gradually deteriorated over time from 99.7% to 79% for the GAC without pretreatment and 99.7% to 85% for the units preceded by ion exchange. t appeared that iron sorption caused fouling of the GAC surface or caused channeling of water through the bed. he gamma emissions data indicated that the zone of radon removal slowly moved down the GAC bed. t higher radon loadings, the GAC units may not be able to dampen variations in influence activity and flow without some increase in effluent activity. he bubble plate and diffused bubble POE units were very efficient (99%) at removing radon from the water. his resilience is primarily due to the high air to water ratios supplied by the aeration blowers. ne major problem associated with the aeration techniques is iron oxidation/precipitation. ron treatment will be required in most all POE applications which use aeration.