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In the sewage treatement, bacterial floc...

In the sewage treatement, bacterial flocs are allowed to sediment iin a settling tank. This sediment is calld as

A

Inactivated sludge

B

Activated sludge

C

Primary sludge

D

Secondary sludge

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The correct Answer is:
B
Once the BOD is reduced the effluent is then passd inot a setting tank where the bacteria flocs are allowed to settle. This sediment is called acitvated sludge . A small part of the activated sludge is pumped back into theaeration tank to serve as incolum. REmaining part is pumped into large thaks called anaerobic sludge digester.
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