ENVR 26 |
| Shannon N. Stokes, Chia-chen Chen, Gerald E. Speitel Jr., and Lynn E. Katz. |
| Packed-bed adsorption systems containing oxide media can provide cost-effective treatment of arsenic contaminated waters. However, the design and performance of these systems is highly dependent on the type of media and the presence of competing ions in solution. Dynamic adsorption models can provide a tool for predicting the performance of these systems over a wide range of operating conditions. Such models require estimation of both adsorption equilibria and rates. Surface complexation models offer tremendous potential for predicting adsorption equilibria on oxide minerals and provide a framework for accurately accounting for water quality changes in a dynamic system. The focus of this research and presentation will be on the development of DLM parameters for arsenate adsorption onto three commercially available adsorbents (GFH, E33 Bayoxide and DOW Adsorbia (titanium dioxide)) in background waters containing silica, calcium and vanadium. It is our belief that the DLM represents the best compromise between model simplicity and the number of model parameters required. |
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Occurrence, Chemistry, Toxicity and Remediation of Arsenic
1:30 PM-4:50 PM, Sunday, 26 March 2006 Georgia World Congress Center -- B218, Oral
Division of Environmental Chemistry |