First slide

Microbes in Sewage Treatment

Question

Once BOD from the sewage is reduced significantly, the ‘flocs’ are allowed to sediment and it is known as _________.

Easy

A

primary sludge
B

secondary sludge
C

activated sludge
D

inactivated sludge

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’ are allowed to sediment. This sediment is called activated sludge.

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