First slide

Microbes in Sewage Treatment

Question

In oxidation pond, once BOD from the sewage is reduced significantly, the ‘flocs’ are allowed to sediment and it is known as :

Easy

A

Activated sludge
B

Inactivated sludge
C

Primary sludge
D

Secondary sludge

Solution

The sedimented flocs in the settling tank is known as activated sludge. It is passed into anaerobic sludge digester.

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