Question

what is biogas describe the steps involved in obtaining biogas

Answer 1

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A mixture of methane and carbon dioxide produced by the decomposition of plant and animal waste, that is used as fuel is known as biogas
Following steps are involved in obtaining biogas: Mixing (slurry of cattle-dung and water). Digesting (cattle-dung undergoing decomposition by anaerobic bacteria). ... The process by which the biomass changes into biogas in the absence of air due to an anaerobic microorganisms is termed as an anaerobic decomposition.
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Answer 2

Biogas is a production of methane which is used as fuel, via fermentation of organic matter.

There are 3 major steps involved in biogas production:

- Hydrolysis: In this step, break down of large organic molecules such as proteins, carbohydrates and lipids into simpler units with the help of enzyme take place, externally.  

- Fermentation: In this step, fermentation of intermediates of organic compounds takes place. In this step, products like volatile organic acids, alcohols, amino acids, CO2 are produced which are later on used as ingredients for the step next.

- Methane formation: In this step, methane producing bacteria decompose compounds completely and produce methane (biogas).