What is Biogas

What is Biogas

 

Biogas can provide a clean, easily controlled source of renewable energy from organic waste materials for a small labour input, replacing firewood or fossil fuels (Which are becoming more expensive as supply falls behind demand). During the conversion process pathogen levels are reduced and plant nutrients made more readily available, so better crops can be grown while existing resources are conserved.

This is the mixture of gas produced by methonogenic bacteria while acting upon biodegradable materials in an anaerobic condition. Biogas is mainly composed of 35 to 75 percent Methane, 30 to 40 percent carbon dioxide (CO2) and low amount of other gases as show n below.

Substances

Symbol

Percentage

Methane

CH4

35 - 75

Carbon Dioxide

CO2

30 - 40

Hydrogen

H2

5-10

Nitrogen

N2

1-2

Water Vapour

H2O

0.3

Hydrogen Sulphide

H2S

Traces

Biogas is about 20 percent lighter than air and has an ignition temperature in the range of 650 degrees to 750 degrees C. It is an odorless and colorless gas that burns with clear blue flame similar to that of LPG gas Its calorific value is 20 Mega Joules (MJ) per m3 and burns with 60 percent efficiency in a conventional biogas stove.

 

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