Select the correct statement from the following.

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Activated sludge-sediment in settling tanks of the sewage treatment plant is a rich source of aerobic bacteria.

Methanobacterium is an aerobic bacterium found in the rumen of cattle.

Biogas is produced by the activity of aerobic bacteria on animal waste.

Biogas, commonly called gobar gas, is pure methane.

answer is A.

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Detailed Solution

Once the BOD of sewage or waste water is reduced significantly, the effluent is then passed into a settling tank where the bacterial ‘flocs’ (masses of aerobic bacteria associated with fungal filaments to form mesh like structures) are allowed to sediment. This sediment is called activated sludge.

Methanobacterium is an anaerobic bacterium found in the rumen of cattle.

Biogas is produced by the activity of anaerobic bacteria on animal waste.

Biogas, commonly called gobar gas, is methane, hydrogen sulphide and carbon dioxide.

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