Abstract
The production of heavy metals has increased quickly since the industrial revolution. Heavy metals frequently form compounds that can be toxic, carcinogenic, or mutagenic, even in very small concentrations. The usual techniques of removing metals from wastewaters are in general expensive and have many restrictions. Alternative methods of metal removal and recovery based on biological materials have been measured. Among various agents, the use of microbes for the removal of metals from industrial and municipal wastewater has been proposed as a promising alternative to conventional heavy metal management strategies in past decades. Thus, the present study aims to isolate and characterize bacteria from soil, sediment, and waters of metal-contaminated industrial area to study the zinc resistance patterns and the zinc bioaccumulation potential of the selected microorganism. Zinc analysis of the samples revealed that concentrations varying from 39.832 μg/L to 310.24 μg/L in water, 12.81 μg/g to 407.53 μg/g in soil, and 81.06 μg/g to 829.54 μg/g in sediment are present. Bacterial zinc resistance study showed that tolerance to Zn was relatively low (<500 μg/ml). Ten bacterial genera were represented in soil and 11 from water, while only 5 bacterial genera were recorded from sediment samples. Bacillus, Pseudomonas, and Enterobacter were found in soil, sediment, and water samples. Highly zinc-resistant Bacillus sp. was selected for zinc removal experiment. Zinc removal studies revealed that at pH 5 about 40% reduction occurs; at pH 7, 25% occurs; and at pH 9, 50% occurs. Relatively an increased removal of Zinc was observed in the first day of the experiment by Bacillus sp. The metal bioaccumulative potential of the selected isolates may have possible applications in the removal and recovery of zinc from industrial effluents.
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Krishna, M.P., Varghese, R., Babu, V.A., Jyothy, S., Hatha, A.A.M. (2012). Bioremediation of Zinc Using Bacillus sp. Isolated from Metal-Contaminated Industrial Zone. In: Sabu, A., Augustine, A. (eds) Prospects in Bioscience: Addressing the Issues. Springer, India. https://doi.org/10.1007/978-81-322-0810-5_2
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DOI: https://doi.org/10.1007/978-81-322-0810-5_2
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