Mathematical Modeling of Heterogeneous Sorption in Continuous Contactors for Wastewater Decontamination.
CLEMSON UNIV S C DEPT OF ENVIRONMENTAL SYSTEMS ENGINEERING
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The objective of this study was to develop a predictive model for adsorption of multi-solutes on activated carbon using a differential contacting system. In order to accomplish this goal, secondary objectives had to be achieved, which were 1 analytical description of multi-solute adsorption equilibrium and 2 description of contactor dynamics as it effects mass transfer. The adsorption equilibria studies were conducted with a bi-solute system of o-phenylphenol and dinitro-o-sec butylphenol in four continuous overflow reactors containing granular active carbon. Reproducible multi-solute equilibrium data were obtained. It was found that the ideal-solution theory and a semi-competitive Langmuir expression using single-solute equilibrium data could be used to describe multi-solute equilibrium. The experimental differential differential contacting studies were conducted using the same bi-solute system and a 250-gram fluidized-bed of activated carbon. Dynamic studies showed that the system was neither totally reversible nor irreversible and strongly supports the concept of adsorptive site specificity as well as indicating the need for kinetic studies of desorption rates. A mathematical model using System360 Continuous Systems Modeling Program was developed which describes the fluid- and solid-phase time concentration profiles. Modified author abstract
- Industrial Chemistry and Chemical Processing
- Physical Chemistry
- Water Pollution and Control