Ministry of Environment, Forest and Climate Change has once again amended the emission standard this year for which a notification G.S.R. 477(E).—dated 27, june 2022 has been issued. Lastly amended vide notification G.S.R. 143(E), dated the 22nd February, 2022. The notice is hereby given that the said draft notification shall be taken into consideration on or after the expiry of a period of sixty days from the date on which copies of the gazette containing this notification are made available to the public.
According to the new notification minimum stack height (in meter) shall be as per the formula: H=14Q0.3 (where Q is SO2 emission rate in kg/hr) or H=74Q0.27 (where Q is PM emission rate in tonne/hr) whichever is more. However, in no case the stack height shall be less than 11 m for boilers of < 2 ton/hour steam generation capacity and 30 m for boilers of higher steam generation capacity.
Measured values of PM, SO2 and NOx to be normalised at 6% O2 for solid fuels and at 3% O2 for liquid fuels, on dry basis, for comparing with above standards, as below: Normalized value = Measured value x [(21- Ref O2 at 6 or 3 %) / (21 - measured O2 in %)] Boilers of 10 TPH or more steam generation capacity shall install continuous emission monitoring system (CEMS) at process stacks for PM and SO2 as per CPCB’s guidelines.
These standards are for industrial boilers using coal/ lignite, pet coke, bagasse/agro-fuels, and FO/LDO/LSHS, and boilers of bagasse/agro-fuels based power plants. Whereas, for boilers of coal/lignite based power plants the emission standards notified for thermal power plants vide notification no S.O. 3305 (E), dated 7th December, 2015 shall be applicable.
The notification also state that any person interested in making any objections or suggestions on the proposals contained in the draft notification may forward the same in writing, for consideration of the central government within the period specified above.