Q.

Which one of the following in sewage treatment removes suspended solids?

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a

Tertiary treatment

b

Secondary treatment

c

Primary treatment

d

Sludge treatment

answer is C.

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Detailed Solution

In sewage treatment, suspended solids are removed during primary treatment. It is also known as physical treatment. It consists of shredding, churning, screening and sedimentation. Sequential filtration removes floating and large suspended solids.

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