Bioremediation

Introduction: Bioremediation is an environmental management technique that uses microorganisms, plants or their biological processes to reduce, remove or transform pollutants in contaminated soil, water and other environments.

Key pointers

  • Biological agents: Bacteria, fungi, plants and associated microbial communities.

  • Applications: Oil-spill cleanup, wastewater treatment, contaminated soil restoration and degradation of certain organic pollutants.

  • Biostimulation: Enhancing the activity of existing microorganisms by supplying nutrients or adjusting environmental conditions.

  • Bioaugmentation: Introducing selected microorganisms to improve pollutant degradation.

  • Phytoremediation: Using plants to remove, stabilize or transform contaminants.

  • Advantages: May be cost-effective, can operate in situ and can reduce the need for excavation.

  • Limitations: Effectiveness depends on temperature, pH, oxygen, nutrient availability and pollutant toxicity.

  • Important distinction: Bioremediation does not guarantee complete removal of every pollutant; heavy metals generally cannot be biologically degraded into non-elements, though they can sometimes be immobilized or transformed.

UPSC focus: Bioremediation is relevant to environmental biotechnology, pollution control and sustainable waste management.