Class 10 Physics Sources of Energy Bio-Mass


  • Plant and animal wastes (dung), vegetable wastes, sewage are decomposed in absence of oxygen to produce Biogas
  • Since the source of these fuels is animal dung, the source of these fuels is called Biomass.
  • It is commonly called Gobar-gas

Biogas Plant

  • Mixing tank : Cow dung and water is mixed together to form slurry which is fed into the mixing tank.
  • Digester : The slurry is passed on to the digester which is a completely sealed chamber with no oxygen. Here anaerobic decomposition of slurry takes place.
  • Gas tank: The anaerobic decomposition releases gases such as methane, carbon-di-oxide, hydrogen and hydrogen sulphide which are collected in the Gas tank and drawn out through the gas outlet

Advantages of Biogas

Disadvantages of Biogas

·         Since India has a large rural population and large live-stock population, this fuel is easily available.

·         Excellent fuel with reasonable heating efficiency

·         Burns without smoke

·         Does not leave residue

·         Slurry residue can be used as a manure

·         Environment friendly


·         Less heating efficiency compared to other sources.

·         Releases gases (carbon, hydrogen, hydrogen sulphide, methane) which can corrode metal parts of the biogas plant itself.

·         It cannot be constructed easily because of the inputs are cow dung (and other wastes) which are available mostly in rural parts only.


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