Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
2 results
Search Results
Item Cadmium (II) and nickel (II) biosorption by Bacillus laterosporus (MTCC 1628)(Taiwan Institute of Chemical Engineers, 2014) Kulkarni, R.; Shetty K, V.; Srinikethan, G.Biosorption of heavy metals is a promising technology that involves removal of toxic metals from industrial waste streams and natural waters. The study describes the sorption of cadmium (II) [Cd (II)] and nickel (II) [Ni (II)] by dead biomass of Bacillus laterosporus, MTCC 1628. The biosorption conditions for the removal of Cd (II) and Ni (II) were examined by studying the effect of pH, contact time, biosorbent dosage and initial metal ion concentration. Shake flask studies yielded adsorption equilibrium in almost 120. min, for both the metals. It was found from Langmuir model that the maximum adsorption capacity for Cd (II) and Ni (II) ions was 85.47. mg/g and 44.44. mg/g respectively. Kinetic evaluation of the experimental data showed that the biosorption process followed pseudo-second order kinetics. Thermodynamic analysis showed that biosorption is an endothermic process with ?. H° of 5.45. kJ/mol for Cd (II) biosorption and 24.33. kJ/mol for Ni (II) biosorption. The surface characteristics of B. laterosporus biomass before and after metal biosorption were analyzed by using scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDAX) to study the changes in surface morphology and elemental constitution of the adsorbent. B. laterosporus exhibited a higher and better potential biosorbent for the removal of Cd (II) as compared to Ni (II) from aqueous solution. © 2013 Taiwan Institute of Chemical Engineers.Item Biosorption study on Ni(II) and Cd(II) removal in a packed bed column using brewery sludge pellets(Springer Science and Business Media Deutschland GmbH, 2024) Kulkarni, R.M.; Shetty K, V.; Srinikethan, G.The study covers the results of investigations on performance of packed bed column as a continuous contactor for nickel [Ni(II)] and cadmium [Cd(II)] biosorption on pellets of brewery sludge. Experiments were conducted to assess influence of design variables such as bed height (2.5 to 10 cm) and flow rate (2.5 to 10 mL/min). By fitting the column data into the model equations, the parameters of the Thomas and bed depth service time (BDST) models, which are utilized in the design of packed column adsorbers, were determined. For Ni(II) biosorption, the computed values of N0 and KA obtained using the BDST model were 1833 mg/L and 0.022 L/mg.h, respectively, whereas for Cd(II) biosorption, the values were 5424 mg/L and 0.005 L/mg.h, respectively. Predicted Ni(II) and Cd(II) uptake using the Thomas model were 7.33 mg/g and 14.79 mg/g at 2.5 mL/min flow rate. Optimal biosorption conditions for Ni(II) and Cd(II) were observed at 2.5 mL/min flow rate and 10 cm bed height. Critical design factors such as length of the unused bed (LUB), stoichiometric time (t*), and mass transfer zone (Δt) needed for scaling up the biosorption process were also determined. The present study has demonstrated that the biosorption of Ni(II) and Cd(II) onto pellets of brewery sludge in packed bed column is intraparticle mass transfer controlled process. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022.