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Biogenic Sulfide-Mediated Iron Reduction at Low pH.

Caryl Ann Becerra1, Brendan Murphy2, Brittnee V Veldman3

  • 1Department of Biology, California State University Channel Islands, Camarillo, CA 93012, USA.

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|October 26, 2024
PubMed
Summary

Biogenic sulfide from sulfate-reducing bacteria (SRB) drives iron reduction in acidic conditions, a key mechanism for natural attenuation of acid mine drainage (AMD). This process creates diverse iron minerals, aiding environmental remediation.

Keywords:
attenuation of acid mine drainage (AMD)biogenic sulfideiron reductionmicrocosmssulfate reductionsulfate-reducing bacteria (SRB)

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Area of Science:

  • Environmental Microbiology
  • Geochemistry
  • Biogeochemical Cycles

Background:

  • Acid mine drainage (AMD) poses a significant threat to aquatic ecosystems.
  • Natural attenuation processes in AMD-impacted systems are not fully understood.
  • Biogeochemical mechanisms driving AMD remediation require further investigation.

Purpose of the Study:

  • To identify biogeochemical mechanisms responsible for the natural attenuation of AMD.
  • To test the hypothesis that biogenic sulfide-mediated iron reduction is a key mechanism.
  • To investigate the role of sulfate-reducing bacteria (SRB) in AMD remediation.

Main Methods:

  • Experimental model system simulating acidic conditions.
  • Selective inhibition of iron-reducing bacteria and SRB.
  • Analysis of microbial communities, including identification of SRB groups.
  • Characterization of mineral precipitates using X-ray diffraction and electron microprobe analysis.

Main Results:

  • Sulfate reduction was confirmed under acidic conditions, with identified SRB from genera like *Desulfotomaculum* and *Desulfovibrio*.
  • Iron reduction was dependent on the presence of SRB and their biogenic sulfide production, not direct enzymatic activity.
  • Addition of organic substrates and nutrients enhanced iron reduction and increased pH.
  • SRB bioactive samples produced diverse iron chalcogenide minerals with reduced iron states and multi-metal incorporation.

Conclusions:

  • Biogenic sulfide produced by SRB is a significant mediator of iron reduction in acidic environments, contributing to AMD natural attenuation.
  • This mechanism expands the known roles of SRB in environmental remediation.
  • The study highlights the interconnectedness of sulfur and iron biogeochemical cycling in AMD systems.