1.

Describe the steps involved in obtaining biogas and explain what is meant by anaerobic decomposition.

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Solution :Following steps are involved in OBTAINING biogas:
(i) Mixing (slurry of cattle-dung and WATER).
(ii) Digesting (cattle-dung undergoing DECOMPOSITION by anaerobic bacteria).
(iii) Formation of biogas (mixture of methane, `CO_(2) , H_(2)and H_(2)S`).
(iv) Spent slurry (residue left after the formation of biogas).
The process by which the biomass change into biogas in the ABSENCE of air due to an anaerobic microorganisms is termed as an anaerobic decomposition.


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