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Steps in Secondary/Biological Treatment

The primary t...

Question

The primary treatment of sewage:

A

Produces activated sludge

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B

Is anaerobic biological process

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C

Is a physical process

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D

Involves anaerobic sludge digester

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Solution

The correct option is C Is a physical process

Primary treatment (physical process) removes floating debris, grits and pebbles from sewage.

Secondary treatment of sewage is a biological process that includes aeration tank and anaerobic sludge digester.

During secondary treatment, activated sludge is produced and pumped back in aeration tank.

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