Why in News?
The Union Ministry of Environment, Forest and Climate Change (MoEF&CC) has issued clarifications and notifications on deadlines for 100% utilisation of fly ash by thermal power plants, tightening existing Environment (Protection) Act rules.
What is Fly Ash?
- Origin: Fly ash is a fine, powdery, unburnt residue generated during the combustion of pulverized coal or lignite in thermal power plants.
- Collection: It is expelled along with flue gases and trapped using Electrostatic Precipitators (ESPs) before it can escape into the atmosphere.
- Chemical Composition: Primarily consists of silicon dioxide (SiO2), aluminium oxide (Al2O3), ferric oxide (Fe2O3), and calcium oxide (CaO).
- Hazardous Contaminants: Contains heavy metal traces like lead, arsenic, mercury, cadmium, and hexavalent chromium, which are toxic and carcinogenic if allowed to leach into groundwater or soil.
- Classification: Categorized by the BIS into Class F (low calcium, pozzolanic properties) and Class C (high calcium, self-cementing properties).
Key Highlights of the 2026 Regulatory Framework
- 100% Utilization Mandate: TPPs must completely utilize generated fly ash, bottom ash, and pond ash within a structured multi-year cycle to prevent accumulation in ash ponds.
- Earmarked MSME Quotas: Power plants must reserve a percentage of "issuable ash" at concessional rates specifically for local users and MSMEs located within a 100 km radius.
- Rationalized Penalties: The environmental compensation penalty (previously set at a flat ₹1,000 per unutilized ton) is being rationalized to align with carry-forward compliance options across multi-year cycles.
- Tender Enforcement: All government construction agencies (such as CPWD and NHAI) must mandatorily incorporate fly ash products into their schedule of approved rates for any infrastructure project within a 300 km radius of a TPP.
Industrial Applications & Environmental Benefits
- Cement & Concrete Production: Replaces a portion of Portland cement, improving concrete durability, reducing permeability, and significantly lowering net carbon emissions (CO2) from cement manufacturing.
- Infrastructure and Logistics: Indian Railways recorded a massive 170% jump in cement and industrial waste transport following targeted bulk logistics reforms for fly ash movement.
- Embankments and Roads: Highly utilized as a stable structural fill material for national highway flyovers, road subgrades, and shoreline protection.
- Green Brick Manufacturing: Transitioning to modern steam-curing and closed-loop water recycling models cuts factory carbon footprints by 30% and curbs localized clay mining.
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