College Chemistry

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By Shaoying Qi, 1 Samer S. Adham, 2 Vernon L. Snoeyink, 3 and Ben W. Lykins Jr. 4

ABSTRACT: A procedure was developed to predict the removal of trace organic compounds from natural water by powdered activated carbon (PAC) adsorption systems, which function as a batch reactor or a continuous stirred tank reactor
(CSTR). The procedure uses the equivalent background compound method coupled with the ideal adsorbed solution theory to quantify the competition between trace organicsand background organic matter in water, and uses the pseudo single-solute homogeneous surface diffusion model to describe the adsorption kinetics of the target compound under the influence of the background organic matter. The parameters required by the model as input data can be independently determined from adsorption isotherms and a set of batch kinetic test data. Good agreement between predicted and actual performance was found for adsorption of atrazine from Central Illinois ground water at different initial concentrations and different carbon doses using a batch reactor and two CSTRs, one of which was a PAC/ ultrafiltration system.

Strict drinking-water standards have been p r o p o s e d for many organic compounds [Federal Register 1987, 52(No. 130; July 8), 1989, 54(No. 97;
May 22); Clark 1989], and the water industry needs to have an effective, economical way to meet the standards. P o w d e r e d activated carbon ( P A C ) adsorption is a promising means of controlling organic contamination in drinking water. Previous studies showed that activated carbon had high adsorption capacities for m a n y compounds (Miltner et al. 1989; N a j m et al.…...

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