Significance of autochthonous Bacillus sp. KK1 on biomineralization of lead in mine tailings |
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| Authors: | Muthusamy Govarthanan Kui-Jae Lee Min Cho Jae Su Kim Seralathan Kamala-Kannan Byung-Taek Oh |
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| Institution: | 1. Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570 752, South Korea;2. Department of Agricultural Biology, College of Agriculture and Life Sciences, Chonbuk National University, Jeonju 561 756, South Korea |
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| Abstract: | The aim of the study was to isolate and characterize potential autochthonous bacteria for biomineralization of Pb in mine tailings. A total of four bacteria were isolated from the soil samples and assayed for tolerance to Pb and other heavy metals. Isolate KK1 exhibited maximum Pb resistance and was subsequently identified as Bacillus sp. based on the partial 16S rRNA gene sequences. The isolate KK1 reduced the Pb ions and did not harbor pbrT gene. Selective sequential extraction of bioaugmented soil revealed that the isolate significantly reduced (26%) the exchangeable fraction and increased (38%) the carbonate fraction of Pb. X-ray diffraction studies confirmed the role of bacterially induced calcite precipitation in the bioremediation of mine tailings. A significant increase in the urease (334%), DHO (dehydrogenase) (14%), and phosphatase (37%) activity was observed in the bioaugmented mine soil. |
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