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28/10/2021 2:00 pm
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Select the correct statement from the following?
(1) Biogas, commonly called gobar gas, is pure methane
(2) Biogas is produced by the activity of aerobic bacteria on animal waste
(3) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
(4) Methanobacterium is an aerobic bacterium found in rumen of cattle
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28/10/2021 2:01 pm
Correct answer: (3) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria