Batch Adsorption of Aqueous Chloroform onto Activated Carbon ?Comparison of an Exact Solution and Various Approximate Solutions?

Abstract

Experiments were carried out for the adsorption of aqueous chloroform onto activated carbon in a batch tank. An examination was then made on the parameter values obtainable from the measured adsorbate bulk concentration time data. Various approximate solutions gave values of the two parameters, adsorption equilibrium constant (Henry type) and surface diffusivity, while an exact solution failed to give values of these parameters. The exact solution only showed a relationship between possible values of the equilibrium constant and surface diffusivity: With the adsorption equilibrium constant value measured from a separate experiment the surface diffusivity value was estimated. Although these two parameter values are close to those obtained from a slight modification of Do and Mayfield approximation, it is recommended to carry out a separate experiment to determine the adsorption equilibrium constant value.