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EVALUATION OF THE MIDDAS SYSTEM FOR DESIGNING GAC ADSORBERS
Citation:
Webert Jr., W. J., M. C. Carter, K. P. Olmstead, AND L. E. Katz. EVALUATION OF THE MIDDAS SYSTEM FOR DESIGNING GAC ADSORBERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-91/048 (NTIS 91-23467), 1991.
Impact/Purpose:
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Description:
The Micro-Diameter-Depth Adsorption System (MIDDAS) was evaluated for its usefulness in determining equilibrium parameters for adsorption in granular activated carbon (GAC) systems. The system employs a column configuration for determining such parameters, rather than the traditional completely mixed batch reaction (CMBR) configuration. The equilibrium results were employed in the Homogeneous Surface Diffusion Model (HSDM) in conjunction with the Short Bed Adsorber (SBA) technique to determine rate parameters for trichloroethylene (TCE) adsorption in GAC in both single-solute and more complex systems. These calibrated rate parameters were used in subsequent verification studies with deep adsorption beds; the results indicated that rate parameters determined using the MIDDAS technique tended to provide better predictions of deep bed behavior compared to those determined with the CMBR methodology.
