Abstract
Abstract
A continuous fixed-bed column study with sodium alginate-polyvinyl alcohol immobilized spent substrate of Pleurotus ostreatus (ISSPO) as biosorbent was carried out for the removal of Cd(II) from aqueous solution. Influence of different operational parameters, for instance, flow rate, bed depth and influent concentration on solute adsorption by ISSPO had been investigated. With increasing bed depth and the decreasing of flow rate and initial influent concentration, breakthrough and exhaustion time increased. With increasing flow rate, adsorption quantity decreased; and with increasing bed depth and initial concentration, adsorption quantity increased. Experimental data were analyzed using Adams–Bohart, Thomas, Yoon–Nelson, and Clark models. Compared with other three models, Thomas model fitted experimental data better, and q0 derived from Thomas model was closer to the experimental data. This revealed that the external and internal diffusion was not the bottleneck of this process.
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