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BATCH AND COLUMN STUDIES FOR CS REMOVAL FROM AQUEOUS SOLUTION USING NATURAL ZEOLITE
Abstract
In this study, the adsorption behavior of natural zeolites (clinoptilolite) with respect to Cs+ has been studied in order to consider its application to purity radioactive wastewater. The natural zeolite was activated in two steps. In the first step with a 2 M HCl solution and then with 2 M NaOH solution. The natural and the chemical treated zeolite was subjected to FTIR spectroscopy, XRD (X-ray diffraction) and SEM (scanning electron microscopy) and EDX analysis. The batch method and column studies have been employed. In a batch study, maximum Cs removal was achieved at pH=2, solid: liquid ratio = 1g/L taking about 60 minutes to attain equilibrium. Fixed-bed column experiments were carried out for different influent cesium concentrations, bed depths, and various flow rates. The breakthrough time and exhaustion time decreased with increasing flow rate, decreasing bed depth and increasing influent cesium concentration. Column adsorption was reversible and the regeneration operation was accomplished by pumping 0.1 M NaOH through the loaded zeolite column.
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