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Title: Fixed bed studies for the sorption of metal ions onto peat
Authors: Ko, Danny Chun Kin
Porter, John Francis
McKay, Gordon
Keywords: Adsorption
Metal ion
Fixed bed column
Mass transfer coefficient
Mathematical modelling
Issue Date: 2003
Citation: Process safety and environmental protection : transactions of the Institution of Chemical Engineers, part B, v. 81, no. 2, Mar. 2003, p. 73-86
Abstract: In this study, peat has been used as an adsorbent for the removal of heavy metals in a fixed bed system. Experiments have been performed to investigate the effect of flowrate and bed depth on the peat–metal ion system. A film–pore diffusion model has been used to predict the breakthrough behaviour. The three major parameters in the mathematical model are the external mass transfer coefficient, k, the effective pore diffusivity, Deff, and the solid-phase loading capacity, qe. One of the main problems in this type of modelling is the prediction of qe, particularly for sorbent–solute systems which take a long time to achieve equilibrium saturation. Some researchers have used the equilibrium isotherm capacity, some utilize a fixed fraction of the isotherm capacity and other workers perform the numerical or graphical mass balances at the breakthrough curves, which is time-consuming and tedious. The present method incorporates a novel empirical solution for qe which is correlated with the service time. Good agreement between the predicted theoretical breakthrough curves and the experimental results is observed.
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