First slide

Microbes in Sewage Treatment

Question

Which of the following in sewage treatment removes suspended solids?

Easy

A

Secondary treatment
B

Primary treatment
C

Sludge treatment
D

Tertiary treatment

Solution

Primary treatment removes suspended solids.
Supernatant impurities forms primary effluent that is to be taken for secondary treatment.
Sludge treatment is part of secondary treatment.
Tertiary treatment is chemical treatment applied for removal of mainly inorganic impurities.

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