Which of the following in sewage treatment removes suspended solids?

  • Option 1)

    Tertiary treatment

  • Option 2)

    Secondary treatment

  • Option 3)

    Primary treatment

  • Option 4)

    Sludge treatment

 

Answers (1)

As we learnt in concept

Primary treatment of sewage -

These treatment steps basically involve physical removal of particles – large and small – from the sewage through filtration and sedimentation.

- wherein

These are removed in stages; initially, floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. All solids that settle form the primary sludge and the supernatant forms the effluent. The effluent from the primary settling tank is taken for secondary treatment.

 

 

 

Primart treatment steps basically involve physical removal of particles – large and small – from the sewage through filtration and sedimentation.


Option 1)

Tertiary treatment

This option is incorrect.

Option 2)

Secondary treatment

This option is incorrect.

Option 3)

Primary treatment

This option is correct.

Option 4)

Sludge treatment

This option is incorrect.

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