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AWWA ACE61650
- Aerogel-GAC Composites for Arsenic and Uranium Removal
- Conference Proceeding by American Water Works Association, 06/17/2005
- Publisher: AWWA
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A process for the adsorption of contaminants from water using silica aerogel/granularactivated carbon (GAC) composites has been developed by Lawrence LivermoreNational Laboratory (LLNL). Like GAC, the aerogel has a very large surface area(approximately 1000 m2/g), but it has the added advantage of being hydrophobic with a low density. Unlike GAC, the composite can remove both volatileorganic compounds (VOCs) and metals. Previous work at LLNL has investigated uranium removal by a phosphorous enrichedhydrophobic aerogel/GAC composite. Producing a P-enriched aerogel-GAC compositeimproved uranium removal above the GAC without the composite. Varying the type andamount of phosphorous (phosphonate, 1% or 17% H<sub>3</sub>PO<sub>4</sub>) affected uranium removal,based upon analysis of isotherm data. Additionally, adsorbency was confirmed via columntests and a field demonstration. This paper briefly discusses this uranium-related work todemonstrate the potential for aerogel-GAC composite materials to remove oxo-anions. Includes table, figures.
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