First slide

Microbes in Sewage Treatment

Question

In primary treatment of sewage water, after sedimentation, the solids that settle form _________.

Easy

A

activated sludge
B

primary sludge
C

secondary sludge
D

anaerobic sludge

Solution

Primary treatment basically involves physical removal of particles – large and small – from the sewage through filtration and sedimentation. All solids that settle form the primary sludge, and the supernatant forms the effluent.

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