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Abstract
Studies of contaminant transport in a reactor using the classical dispersion equation (CDE) often simplified or neglected the reaction of the contaminant with the stationary phase. This study was an effort to simulate reactive contaminant transport in saturated and fully stirred reactor system, in which dispersion is negligible, using a model developed on the basis of mass balance with fixed flux, and to investígate the effect of solute adsorption parameters on the breakthrough curve (BTC) and on solute accumulative in the output effluent. The Freundlich adsorption isotherm [G,=wkCt b, where, Gt is solute adsorption per unit of volume of the media during time t (for complete abbreviations and units, please see appendix), Ct is the mean concentration of the solute in the output effluent corresponding to time t, and k and b (0<b≤1) are coefficients] was incorporated into the model. It was shown that as the value of b or k increased, the rate at which Ct of the output effluent approached the maximum value declined. The calculated solute accumulation in the output effluent varied inversely with values of b while the reverse was true with the values of F. This resulted from greater amount of contaminant retention by the media of higher adsorption capacity. The output of the simulation suggests that quality of the output effluent of a wastewater treatment facility can be accurately related to flux, characteristics of the media and the wastewater being treated. The model was developed using b values of 0, 0.5, and 1, as any b value can be changed to 0, 0.5 or 1 after transformation of the adsorption isotherms. The model may not be suitable for describing contaminant transport in unsaturated and not stirred reactor, or in cases where the solute dispersion effect can not be neglected.