Nisargruna biogas plants can produce 25-30 kg of methane and 50-60 kg of organic manure from one tonne of biodegradable waste (Efficient way to turn waste into resource http://t.co/OLKeUECi...)...
But the Nisargruna plants are biphasic (aerobic followed by anaerobic phase) and produce biogas containing 70-80 per cent of methane and only 30-20 per cent of carbon dioxide,” he says.
More the methane produced, the better is the fuel value. One tonne of biodegradable waste contains only 22-24 per cent of solid matter; the rest is water. And 30 per cent of municipal waste is biodegradable waste. So with one tonne of biodegradable waste (containing 220-240 kg of solid material) it will be possible to produce 25-30 kg of methane, about 150 kg of carbon dioxide and 50-60 kg of organic manure.
The methane enriched biogas can be used directly for heating (instead of LPG) or for generating electricity. Dr. Kale underlines the higher levels of efficiency when it is used directly for heating and strongly recommends it.