First slide

Microbes in Sewage Treatment

Question

During sewage treatment, the primary effluent is first passed into:

Easy

A

Sequential filtration tank for primary treatment
B

Sedimentation tank for biological treatment
C

Anaerobic sludge digestor for biological treatment
D

Large aeration tank for biological treatment

Solution

The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it.
Primary treatment includes filtration and sedimentation of floating debris and grit.
A major part of the activated 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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