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Question

Write note on a typical biogas plant. How microbes help in production of biogas.

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Solution

  • Biogas is a mixture of gases (predominantly methane) produced by the microbial activity which may be used as fuel.
  • Certain bacteria which grow anaerobically on cellulosic material produces a large amount of methane along with carbon dioxide and hydrogen.
  • These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium.
  • These bacteria are commonly found in the anaerobic sludge during sewage treatment.
  • The biogas plant consists of a concrete tank (10-15 feet deep) in which bio-wastes are collected and a slurry of dung is fed.
  • A floating cover is placed over the slurry, which keeps on rising as the gas is produced in the tank due to the microbial activity.
  • The biogas plant has an outlet, which is connected to a pipe to supply biogas to nearby houses.


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