1.

Explain the process of production of biogas with this activated sludge with the importance of the biogas so produced in a daily life.

Answer»
  1. A small part of activated sludge is allowed to pumped back into the aeration tank to serve as an inoculum. The remaining part of the sludge is pumped into anaerobic sludge digesters in which anaerobic microbes digests the organic mass as well as aerobic microbes (bacteria and fungi) of the sludge which in turn produces gases like methane, hydrogen sulphide (H2S), carbon dioxide (CO2), etc. These gases so formed are collectively known as biogas.

Importance of biogas
1. It is used as a source of energy for cooking and for the purpose of heating as well.
2. Reduces greenhouse effect.



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