Abstract
Mathematical models for waste air treatment with a biofilter (part 1) are modified for the case that the adsorption capacity is limited. With the aid of process lumping the governing equations of unsteady states are solved analytically for the simple and easy utilization of a biofilter in industrial operations. Adopting clouding effect in κa in order to explain reversible adsorption processes when the adsorption capacity is limited as the adsorption sites on the surface of a medium are occupied, the modified model is applied to unsteady-state operations of a biofilter so that the trends of the predictions may be comparable to those of the experimental data of Hodge and Devinny when granular activated carbon or compost are used as the medium of a biofilter. The characteristics of this model do not require a numerical solution but a simple analytical algebraic solution to express the concentration of an organic pollutant in waste air streams even under unsteady operating conditions. Thus the modified model would satisfy the important model requirement of simplicity and would be a unique model that is able to explain theoretically the effect of adsorption capacity of the medium to the pollutant removal efficiency of a biofilter.
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