Flue-Gas desulphurisation
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- Sulphur dioxide is acidic in nature, thus spray the exhaust gas(flue gas) with limestone/soap or anything that is basic in nature (sodium hydroxide, lime, sodium sulfite, ammonia).
- In 2015, Ministry of Environment, Forest and Climate Change issued notification to regulate emissions from coal-based power plants and set deadline of 2017 for flue-gas desulphurisation.
- However, the deadlines have been missed repeatedly leading to pushing of deadlines to 2024 for coal plants near Delhi, 2026 for other coal plants.
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