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Select the correct statement from the fo...

Select the correct statement from the following

A

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

B

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

C

Methanobacterium is an aerobic bacterium found in rumen of cattle

D

Biogas, commonly called gobar gas, is pure methane

Text Solution

Verified by Experts

The correct Answer is:
A
An activated sludge refers to a multi chamber reactor unit that make use of highly concentrated microorganisms to degrade organics and remove nutrients from wastewater to produce a high quality effluent. To maintain aerobic conditions and to keep activated sludge suspended a continuous and well - timed supply of oxygen is required
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