Study of multi-stage cadmium adsorption by riverine sediments

Document Type : Research Paper


1 Department of Water Science and Engineering, University of Arak

2 Department of Irrigation & Reclamation Eng., University of Tehran.

3 Department of Water Eng., Imam Khomeini International University


Most riverine sediments have the high capability to adsorb and store heavy metal ions. In the present study, the adsorption capacity of ‎the bed sediments collected from the Karaj River (Iran) were experimentally studied for cadmium ion adsorption. Multi-stage batch adsorption experiments were carried out for a constant ‎sediment concentration of 20 g/L and different initial cadmium concentrations ‎of 0.2, 0.5, 1, 10, 20, and 50 mg/L. The cadmium solutions with known concentrations were added to the bed ‎sediment with the mean diameter of 0.53 mm in five stages to characterize the capacity of the sediments to adsorb cadmium. The batch adsorption experiments were conducted as both kinetics and equilibrium. ‎‎The results showed that by adding cadmium ions to the sediment at each stage, the adsorption capacity was less than the previous stage, and for a cadmium concentration of 0.2 mg/L, the adsorption percent and the amount of adsorbed cadmium was reduced from 88 to 70% and 9 to 6.8 mg/kg, respectively. These changes decreased with increasing initial Cd concentrations. This process is useful for seasonal rivers in which a certain concentration of heavy metal pollution may occasionally flow over the bed.


Main Subjects

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