Product

Compressed Biogas is raw biogas that has been cleaned of CO2, H2S and moisture to at least 90% methane, then compressed to about 250 bar so it can be used like CNG. Meeting the Indian standard IS 16087 is what makes it CBG rather than upgraded biogas.

Biogas is the raw 50-70% methane gas from the digester. Biomethane is biogas upgraded to above about 90% methane. CBG is Indian-standard biomethane compressed to roughly 250 bar for sale. Bio-CNG is a common synonym for CBG.

Chemically they are nearly identical - both are mostly methane - so CBG runs in the same vehicles and the same networks as CNG. The difference is origin: CBG is renewable and made from waste, which is what earns it a blending mandate and a policy price.

It must meet IS 16087 - methane above 90% - plus limits on moisture, H2S, CO2 and inerts, so it performs like natural gas in the same equipment. Meeting the BIS specification is a legal precondition for commercial sale, not a quality preference.

Compression to about 200-250 bar packs enough energy into a cascade or cylinder to be transported and dispensed like CNG. Under SATAT the delivered price assumes CBG compressed to 250 bar and delivered in cascades to the retail outlet.

Digestate is the nutrient-rich material left after the microbes have taken the biogas out. Processed, it becomes organic fertiliser - solid Fermented Organic Manure (FOM) or Liquid FOM (LFOM) - and it returns carbon and nutrients to the soil the feedstock came from.

No. Every tonne of biogas leaves digestate behind, and selling it as FOM or LFOM is essential to plant economics rather than a bonus. A plant modelled on gas revenue alone is usually modelled short.

Fermented Organic Manure is the solid, standardised fertiliser product made from digestate; raw digestate is the wet effluent leaving the digester. FOM has to meet Fertiliser Control Order specifications before it can legally be sold as manure.