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Microbial communities in acid mine drainage.

Brett J Baker1, Jillian F Banfield

  • 1Departments of Earth and Planetary Sciences and Environment Sciences Policy and Management, University of California Berkeley, Berkeley, CA 94720, USA.

FEMS Microbiology Ecology
|September 2, 2009
PubMed
Summary

Acid mine drainage (AMD) releases toxic metals from sulfide minerals. Microbial communities in AMD catalyze these reactions, influencing metal release rates and ecosystem contamination.

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Area of Science:

  • Environmental Microbiology
  • Geochemistry
  • Mining Engineering

Background:

  • Sulfide mineral dissolution generates acid mine drainage (AMD), releasing toxic metals and sulfuric acid.
  • Mining activities increase oxidant access to sulfide minerals, exacerbating AMD and ecosystem contamination.
  • Microbial communities, comprising archaea and bacteria, play a crucial role in catalyzing iron and sulfur oxidation within AMD environments.

Purpose of the Study:

  • To review the microbial ecology and geochemical processes within acid mine drainage (AMD) systems.
  • To highlight the role of microbial communities in catalyzing metal and sulfur release.
  • To emphasize the suitability of AMD systems for genomic-based ecological and evolutionary analyses.

Main Methods:

  • Review of existing literature on microbial communities in AMD.
  • Analysis of metabolic pathways, including organoheterotrophy, iron and sulfur oxidation, anaerobic sulfur oxidation, and ferric iron reduction.
  • Examination of physiological synergy in element cycling (iron, sulfur, carbon).

Main Results:

  • AMD microbial communities are characterized by a limited number of prokaryotic lineages and species, adapted to extreme conditions.
  • Key metabolisms include organoheterotrophy and autotrophic iron/sulfur oxidation, with anaerobic sulfur oxidation and ferric iron reduction also present.
  • Evidence suggests physiological synergy in iron, sulfur, and carbon flow within these simplified microbial ecosystems.

Conclusions:

  • The microbial and geochemical simplicity of AMD systems makes them ideal for quantitative, genomic-based studies.
  • Understanding these communities is crucial for managing AMD and mitigating its environmental impact.
  • AMD microbial ecology offers insights into microbial adaptation, evolution, and community function under extreme conditions.