Bio/phyremediation potential of Leptospirillum ferrooxidans and Ricinus communis on metal contaminated mine sludge

• Published in: Chemosphere (Oxford) 2023-10, Vol.339, p.139739-139739, Article 139739
• Main Authors: Thanh, Nguyen Chi, Narayanan, Mathiyazhagan, Saravanan, Mythili, Chinnathambi, Arunachalam, Ali Alharbi, Sulaiman, Brindhadevi, Kathirvel, Sharma, Ashutosh, Pugazhendhi, Arivalagan
• Format: Article
• Language: English
• Subjects: Heavy metals: Bioremediation; Leptospirillum ferrooxidans; Phytoextraction; Ricinus communis
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2023.139739

The heavy metal pollution is a serious environmental pollution around the globe and threatens the ecosystem. The physicochemical traits (pH, Electrical conductivity, hardness, NPK, Al, Fe, Cd, Cr, Pb, Mg, and Mn) of soil sample collected from the polluted site were analyzed and found that the most of the metal contents were beyond the acceptable limits of national standards. The metals such as Mn (1859.37 ± 11.25 mg kg−1), Cd (24.86 ± 1.85 mg kg−1), Zn (795.64 ± 9.24 mg kg−1), Pb (318.62 ± 5.85 mg kg−1), Cr (186.84 ± 6.84 mg kg−1), and Al (105.84 ± 5.42 mg kg−1) were crossing the permissible limits. The pre-isolated L. ferrooxidans showed considerable metal tolerance to metals such as Al, Cd, Cr, Pb, Mg, and Mn at up to the concentration of 750 μg mL-1 and also have remediation potential on polluted soil in a short duration of treatment. The greenhouse study demonstrated that the bio/phytoremediation potential of metal tolerant L. ferrooxidans and R. communis under various remediation (A, B, and C) groups. Surprisingly, remediation group C demonstrated greater phytoextraction potential than the other remediation groups (A and B). These results strongly suggest that coexistence of L. ferrooxidans and R. communis had a significant positive effect on phytoextraction on metal-contaminated soil. [Display omitted] •Novel report of R. communis phytoremediation on bauxite mine polluted soil•L. ferrooxidans showed extend metal tolerance against Al, Cd, Cr, Pb, Mg, and Mn•L. ferrooxidans has fine bioremediation potential on polluted soil•R. communis possess great phytoremediation under the effect of L. ferrooxidans•R. communis & L. ferrooxidans combination effectively reduce the metals pollutant