Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product

Abstract

Microbial Cr(VI) reduction is a significant process in detoxification of Cr(VI) pollution. In this study, a new Cr(VI)-reducing bacterial strain, Cr-4, was isolated from soil around the chromium-containing slag. The analysis of the 16S ribosomal RNA (rRNA) gene sequence revealed that the newly isolated strain was closely related to Bacillus anthracis. The response to Cr(VI) stress and reduction capacity of the isolate were investigated. Cell growth decreased with the increase of Cr(VI) concentration. Cell morphology varied and cell growth was inhibited remarkably in the presence of 125 mg/L Cr(VI). The strain grew well and removed Cr(VI) effectively at a Cr(VI) concentration lower than 50 mg/L. Cr(VI)-reducing activity was inhibited by Zn2+, while significantly stimulated by Cu2+. The activity of Cr(VI) reduction by cell-free extract was demonstrated. Total chromium analysis and the energy-dispersive X-ray analysis (EDAX) spectrum revealed that Cr(VI) removal was caused mainly by microbial reduction rather than by biosorption and the main part of the reduced Cr(III) existed as soluble form in solutions.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51108167) and the Fundamental Research Funds for the Central Universities, Hunan University.

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Correspondence to Wei-Hua Xu.

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Xu, WH., Jian, H., Liu, YG. et al. Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product. Water Air Soil Pollut 226, 82 (2015). https://doi.org/10.1007/s11270-015-2356-z

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Keywords

  • Bacillus anthracis
  • Bioremediation
  • Cr(VI) reduction
  • Cr(VI) stress
  • Cr(III)