Abstract
Modelling of the removal of synthetic dyes from aqueous solutions by adsorbents is important to develop an appropriate treatment plan using adsorption process. This paper presents a computational fluid dynamic model incorporating the Langmuir isotherm scheme and second-order kinetic expression to describe the adsorption process. The governing equation of the model was numerically solved using PHOENICS software to simulate synthetic dyes adsorption from the aqueous system. The experimental results presented in this study and taken from the literature for the removal of synthetic dyes were compared with those results predicted by the numerical model. The predicted outputs of the model match the experimental measurements satisfactory. A sensitivity analysis of the major parameters that influence the percent of dye removal from solution phase has been carried out. Three of the main parameters taken into account were the kinetic rate constant, amount of dye adsorbed at equilibrium and the Langmuir isotherm constant. It was found that the model is most sensitive to the amount of dye adsorbed at equilibrium. This effect is most obvious at the early stages of the adsorption process when the rate of dye removal is very fast. Quantification of the reaction mechanism allows developing an appropriate remediation strategy based on the adsorption process.
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Acknowledgements
The authors would like to acknowledge the financial support made by the Institute for Colorants, Paints and Coatings. The authors also are grateful to Shahrood University of Technology for supporting this research.
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Doulati Ardejani, F., Badii, K., Farhadi, F. et al. A Computational Fluid Dynamic Model for Prediction of Organic Dyes Adsorption from Aqueous Solutions. Environ Model Assess 17, 505–513 (2012). https://doi.org/10.1007/s10666-012-9310-x
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DOI: https://doi.org/10.1007/s10666-012-9310-x