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Fixed bed studies for the sorption of metal ions onto peat

Authors Ko, DCK
Porter, JF
McKay, G.
Issue Date 2003
Source Process safety and environmental protection , v. 81, (B2), 2003, MAR, p. 73-86
Summary 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, D-eff, and the solid-phase loading capacity, q(e). One of the main problems in this type of modelling is the prediction of q(e), 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 q(e), which is correlated with the service time. Good agreement between the predicted theoretical breakthrough curves and the experimental results is observed.
ISSN 0957-5820
Language English
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