1.

The biogas plant shown below is used in rural areas for the production of biogas.(1) Observe the figure and label the different parts marked.(2) Explain the working of a biogas plant.

Answer»

(1) Different parts marked are A – Sludge tank, B – Gas holder, C – Charge Pit
(2) Biogas plant consists of a concrete tank (10-15 feet deep) in which the biowastes are collected and slurry of dung is fed. A floating cover is placed over the slurry which is allowed to rise as the gas is produced in the tank due to the microbial activity of methanogens. Methanogens grows anaerobically on cellulose present in cow dung producing large amount of methane (CH4), hydrogen (H2) and carbon dioxide (CO2). The biogas plant has an outlet being connected to a pipe to supply biogas. The spent slurry is removed through another outlet and is used as a manure.



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