Anaerobic bio-removal of uranium (VI) and chromium (VI): Comparison of microbial community structure

  • Martins M
  • Faleiro M
  • Chaves S
 et al. 
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Abstract

Several microbial communities, obtained from uranium contaminated and non-contaminated samples, were investigated for their ability to remove uranium (VI) and the cultures capable for this removal were further assessed on their efficiency for chromium (VI) removal. The highest efficiency for removal of both metals was observed on a consortium from a non-contaminated soil collected in Monchique thermal place, which was capable to remove 91% of 22 mg L-1 U(VI) and 99% of 13 mg L -1 Cr(VI). This study revealed that uranium (VI) removing communities have also ability to remove chromium (VI), but when uranium (VI) was replaced by chromium (VI) several differences in the structure of all bacterial communities were observed. TGGE and phylogenetic analysis of 16S rRNA gene showed that the uranium (VI) removing bacterial consortia are mainly composed by members of Rhodocyclaceae family and Clostridium genus. On the other hand, bacteria from Enterobacteriaceae family were detected in the community with ability for chromium (VI) removal. The existence of members of Enterobacteriaceae and Rhodocyclaceae families never reported as chromium or uranium removing bacteria, respectively, is also a relevant finding, encouraging the exploitation of microorganisms with new abilities that can be useful for bioremediation. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • 16S rRNA gene
  • Bacteria
  • Bacteria (microorganisms)
  • Bacteria, Anaerobic
  • Bacterial community
  • Bacterial consortia
  • Bacteriology
  • Biodegradation
  • Biodegradation, Environmental
  • Biotechnology
  • Chromium (VI)
  • Chromium compounds
  • Chromium removal
  • Clostridium
  • Contaminated soils
  • Enterobacteriaceae
  • Metal recovery
  • Microbial communities
  • Microbial community structures
  • Phylogenetic analysis
  • RNA
  • RNA 16S
  • Rhodocyclaceae
  • Soil Microbiology
  • Soil Pollutants
  • Soil Pollutants, Radioactive
  • Soil pollution
  • TGGE
  • Transuranium elements
  • Uranium (VI)
  • Uranium compounds
  • anaerobic bacterium
  • anoxic conditions
  • article
  • bacterium
  • bacterium culture
  • bacterium identification
  • bioremediation
  • chromium
  • community structure
  • comparative study
  • controlled study
  • electrokinesis
  • heavy metal removal
  • microbial community
  • nonhuman
  • phylogenetics
  • phylogeny
  • uranium

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Authors

  • M Martins

  • M L Faleiro

  • S Chaves

  • R Tenreiro

  • E Santos

  • M C Costa

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