Annexure 1

Final destination of waste in Bangalore city

SWM option

%

Reuse

19

Recycling

43

Composting

7

Disposal

31

Source: Gerlagh et al., 1999

Biogas Composition:

The gas obtained during anaerobic digestion comprises of methane, carbon dioxide, some inert gases and sulfur compounds. Usually 100-200 m 3 of total gas are produced per ton of organic USW digested.

Typical biogas composition:

Methane

55-70% by vol.

Carbon dioxide

30-45% by vol

Hydrogen sulphide

200-4000 ppm by vol

Energy content of gas product

20-25MJ/standard m3

Energy content of CH4 per ton MSW

167-373MJ/Ton MSW

Source: Verma, 2002