Select the correct statement from the following

Easy

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

Solution

A small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called anaerobic sludge digesters. Here, other kinds of bacteria, which grow anaerobically, digest the bacteria and the fungi in the sludge.

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