question_answer 70)

  Draw a diagrammatic sketch of biogas plant and label its various components given below gas holder, sludge chamber, digester, dung +water chamber.

Answer:

                  The raw material for biogas production is excreta (dung) of cattle. The biogas plant has a concrete tank (10-15 feet deep) in which bio-wastes and slurry of dung is collected.     The tank has a floating cover which rises on production of gas in the tank. Methanobacterium in the dung act on the bio-wastes to produce biogas. The gas produced is supplied to nearby houses by an outlet. Through another outlet, the spent slurry is removed to be used as fertilizer. Biogas is used as fuel for cooking and lighting.