Abstract
Biosorption potential of oxidised coconut coir (OCC) for removal of Cd(II) was evaluated by multi-column arrangement by connecting three columns in series. Effect of flow rate at 5, 10 and 15 mL/min was studied at 30 mg/L initial Cd(II) concentration. The dynamic capacity of the system was found to be 321, 206 and 83 mg/L for 5, 10 and 15 mL/min flow rates, respectively, by applying the bed depth service time model. Biosorbent usage rates for single-column and multi-column systems were compared. Better utilisation of biosorbent was observed when the columns are connected in series at similar operating parameters. A simple acid-base regeneration procedure was found to be effective in desorbing/regenerating the cadmium bound biosorbent. Adsorption efficiency was found to decrease from 76.3% for the first cycle to 72.2% and 70.6% in the second and third cycles, respectively. Regeneration efficiencies were more than 94% up to 3 cycles. The study highlights the effectiveness of the multi-column system in biosorption against the conventional single-column system.
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This study received funding from the Special Assistance Programme of University Grants Commission, New Delhi, India.
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Gondhalekar, S.C., Shukla, S.R. Enhanced adsorption performance of oxidised coconut coir for removal of Cd(II) ions by multi-column arrangement in series. Environ Sci Pollut Res 26, 28022–28030 (2019). https://doi.org/10.1007/s11356-019-05995-1
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DOI: https://doi.org/10.1007/s11356-019-05995-1