Why in the News?
A high-powered committee chaired by Principal Scientific Advisor (PSA) Ajay Sood has proposed that India should discontinue the mandatory use of Flue Gas Desulphurisation (FGD) units in most coal-fired Thermal Power Plants (TPPs).
Why mandatory FGDs are opposed?
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About Flue Gas Desulphurisation (FGD):
- Purpose: FGD is a technology used to remove sulphur dioxide (SO₂) from flue gases produced by burning coal and oil, especially in thermal power plants.
- Environmental Benefit: It helps prevent acid rain, which harms crops, buildings, soils, and aquatic ecosystems.
- Chemicals Used: Common absorbents include limestone (CaCO₃), lime (CaO), and ammonia (NH₃).
- Types of Systems:
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- Dry Sorbent Injection: Cost-effective, but less efficient.
- Wet Limestone-Based: Effective and used in large plants, produces gypsum.
- Seawater-Based: Uses alkaline seawater, ideal for coastal areas.
FGD Mandate in India:
- Current Status: FGD units are being installed in 537 coal-based thermal power units, but 92% of India’s 600 plants still lack them.
- Committee Recommendation: An expert panel advised exempting 80% of plants from FGD requirements due to feasibility issues.
- Implementation Barriers: Limited vendors available; High costs and risk of increased electricity tariffs.
| [UPSC 2023] Consider the following:
1. Carbon monoxide 2. Nitrogen oxide 3. Ozone 4. Sulphur dioxide Excess of which of the above in the environment is/are cause(s) of acid rain? Options: (a) 1, 2 and 3 (b) 2 and 4 only* (c) 4 only (d) 1, 3 and 4 |
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