Abstract
In this study, Nostoc muscorum, a native cyanobacterial species isolated from a coal mining site, was employed to remove Cu(II), Zn(II), Pb(II) and Cd(II) from aqueous solution containing these metals in the mixture. In this multicomponent study, carried out as per the statistically valid Plackett-Burman design of experiments, the results revealed a maximum removal of both Pb(II) (96.3 %) and Cu(II) (96.42 %) followed by Cd(II) (80.04 %) and Zn(II) (71.3 %) at the end of the 60-h culture period. Further, the removal of these metals was attributed to both passive biosorption and accumulation by the actively growing N. muscorum biomass. Besides, the specific removal rate of these metals by N. muscorum was negatively correlated to its specific growth rate. For a better understanding of the effect of these metals on each other’s removal by the cyanobacteria, the results were statistically analyzed in the form of analysis of variance (ANOVA) and Student’s t test. ANOVA of the metal bioremoval revealed that the main (individual) effect due to the metals was highly significant (P value <0.05) on each other’s removal. Student’s t test results revealed that both Zn(II) and Pb(II) strongly inhibited both Cu(II) removal (P value <0.01) and Cd(II) removal (P value <0.02). All these results not only demonstrated a very good potential of the cyanobacteria in the bioremoval of these metals but also the effect of individual metals on each other’s removal in the multicomponent system.
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Acknowledgments
The authors thank the Department of Biotechnology, Government of India (BT/216/NE/TBP/2011) for providing the necessary financial support for this research work. They also thank Mr. M. Gopi Kiran, Centre for the Environment, IIT Guwahati, India, for his help in heavy metal analyses of the samples.
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The authors declare that they have no conflict of interest.
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Roy, A.S., Hazarika, J., Manikandan, N.A. et al. Heavy Metal Removal from Multicomponent System by the Cyanobacterium Nostoc muscorum: Kinetics and Interaction Study. Appl Biochem Biotechnol 175, 3863–3874 (2015). https://doi.org/10.1007/s12010-015-1553-y
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DOI: https://doi.org/10.1007/s12010-015-1553-y