Context:
- India’s growing pollution burden and industrial contamination has increased the need for sustainable cleanup methods.
- Bioremediation is highlighted as an eco-friendly, cost-effective, and scalable solution for soil, water, and waste contamination.
What is Bioremediation?
- Use of living organisms—bacteria, fungi, algae, or plants—to break down, transform, or detoxify pollutants.
- Mechanism: Microbes metabolize contaminants as food, converting them into harmless by-products such as water, CO₂, organic acids, or non-leachable metals.
Types of Bioremediation
1. In-situ Bioremediation (On-site)
- Treats pollutants directly at the contaminated location.
- Techniques:
- Bioventing: Air and nutrients injected to stimulate microbes in soil.
- Air Sparging: Oxygenates groundwater to degrade volatile pollutants.
- Biobarriers/Biowalls: Microbes in trenches degrade contaminants in flowing groundwater.
- Water Recirculation: Contaminated water is treated and reinjected to enhance biodegradation.
2. Ex-situ Bioremediation (Off-site)
- Contaminated soil or water is removed, treated in reactors, and returned.
- Used when pollution levels are high or on-site conditions cannot be controlled.
