Mathematical Modeling of Heterogeneous Sorption in Continuous Contactors for Wastewater Decontamination;Influence of Reversibility and Chromatographic Effects on System Design and Operation.

摘要

As water quality standards have become more stringent, there has been an increasing interest in the use of activated carbon for the removal of trace contaminants. Accordingly, the objective of this study was to develop a predictive model for adsorption of multiple solutes from solution onto activated carbon using a differential contacting system. To accomplish this goal, two secondary objectives had to be achieved. These were (1) to evaluate existing multi-solute adsorption equilibria models and (2) to determine how adsorption reversibility and chromatographic effects would influence the design and subsequent operation of prototype adsorbers. Numerous adsorption equilibrium studies were conducted using bi-solute combinations of o-phenylphenol (OPP), dinitro-o-sec-butyphenol (DNOSBP), and 2,4-dichlorophenol (2,4-DCP). Results of these studies were employed to evaluate the utility of the Longmuir Competitive, Longmuir Semi-Competitive Ideal Solution Theory and Graphical Models of competitive adsorption equilibria. Neither of the models was found to adequately describe competitive adsorption effects. Nonetheless, the Graphical approach gave the best estimate of competitive interactions.