4.7 Article

Metagenomic analysis of microbial community and its role in bioelectrokinetic remediation of tannery contaminated soil

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 412, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125133

关键词

Metagenomic; Microbes; Tannery effluent; Chromium; Bioreduction

资金

  1. Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia [IFKSURGP-023]

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This study focused on the application of bio-electrokinetic remediation for tannery effluent contaminated soil, successfully achieving bioreduction of hexavalent chromium to trivalent chromium and significant removal of total chromium and organic content. The presence of pollutant degrading microbes enhanced the bioreduction process during the electrokinetic remediation, showcasing the potential of this technique in treating polluted soils efficiently.
Tanneries create a serious threat to the environment by generating a significant amount of toxic metal-containing solid waste. This study deals with the application of bio-electrokinetic remediation (Bio-EK) of tannery effluent contaminated soil (TECS). Metagenomes representing the TECS sample were sequenced using the Illumina HiSeq platform. The bioreduction of hexavalent chromium Cr(VI)to trivalent chromium Cr (III) was achieved by BIO-EK techniques. NGS-data (Next Generation Sequencing) analysis was revealed that Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteria, and Planctomycetes were identified in the bio-electrokinetic system. Proteobacteria are responsible for the bioreduction of chromium hexavalent by the formation of FeS particles. The biogenerated FeS particles can be reduced the toxic chromium (VI) to non?toxic chromium (III) in soil. Simultaneously total chromium and organic content were significantly removed in BIO-EK (40 and 290 mg kg-1) when compared to control soil (182 and 240 mg kg? 1). The presence of pollutant degrading microbes such as Desulfovibrio, Pseudomonas, Bacillus, Clostridium, Halanaerobium enhanced the bioreduction of the chromium during the electrokinetic remediation. This study can be claimed that the microbial cultures assisted electrokinetic remediation of total chromium, organic and iron in the tannery effluent contaminated soil was one of the suitable efficient techniques. In addition, the viability of the new combination technology developed (Electrokinetic + Bio) to treat low-permeability polluted soils was demonstrated.

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