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CHITOSAN-BASED SILVER NANOCOMPOSITE FOR HEXAVALENT-CHROMIUM REMOVAL FROM TANNERY INDUSTRY EFFLUENT USING A PACKED-BED REACTOR
Ekambaram, N., S. Varjani, S. Goswami, U. Singh, and T. Kapoor.
Journal of Environmental Engineering 146(6) [Published online prior to print]
Chitosan-based silver nanocomposite beads synthesized through a facile chemical precipitation method was evaluated to remove Cr(VI) from synthetic and tannery industrial effluents in a packed bed reactor. The effect of various process parameters, such as residence time (3-7 h), initial Cr(VI) concentration (10-30 mg/L), silver nanocomposite dosage (5-30 g/L), and flow rate (5-20 mL/min), was investigated using synthetic effluent. Maximum Cr(VI) removal was achieved with a residence time of 5 h, initial Cr(VI) concentration of 20 mg/L, silver nanocomposite dosage of 30 g/L, and flow rate of 5 mL/min. Results indicated that an increase in initial Cr(VI) concentration, the amount of bead, and residence time increased the efficiency of Cr(VI) removal. In contrast, an increase in the flow rate decreased sorption efficiency. The evaluated process parameters exhibited almost 90% of Cr(VI) elimination from tannery industrial effluent at a concentration of 20 mg/L in the packed bed reactor.
Journal of Environmental Engineering 146(6) [Published online prior to print]
Chitosan-based silver nanocomposite beads synthesized through a facile chemical precipitation method was evaluated to remove Cr(VI) from synthetic and tannery industrial effluents in a packed bed reactor. The effect of various process parameters, such as residence time (3-7 h), initial Cr(VI) concentration (10-30 mg/L), silver nanocomposite dosage (5-30 g/L), and flow rate (5-20 mL/min), was investigated using synthetic effluent. Maximum Cr(VI) removal was achieved with a residence time of 5 h, initial Cr(VI) concentration of 20 mg/L, silver nanocomposite dosage of 30 g/L, and flow rate of 5 mL/min. Results indicated that an increase in initial Cr(VI) concentration, the amount of bead, and residence time increased the efficiency of Cr(VI) removal. In contrast, an increase in the flow rate decreased sorption efficiency. The evaluated process parameters exhibited almost 90% of Cr(VI) elimination from tannery industrial effluent at a concentration of 20 mg/L in the packed bed reactor.
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