Answer:
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, CO2,
H2 and H2S).
(iv) Spent
slurry (residue left after the formation of biogas).
The
process by which the biomass changes into biogas in the absence of air due to
an anaerobic bacteria is termed as an anaerobic decomposition.
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