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Which of the following is not correct regarding the primary treatment of waste-water?

AInitially floating debris is removed by distillation

BGrit and pebbles are removed by sedimentation

CSolids that settle form the primary sludge

DSupernatant forms the effluent

Answer:

A. Initially floating debris is removed by distillation

Read Explanation:

  • In primary treatment, initially floating debris is removed by sequential filtration.

  • Then grit and small pebbles are removed by sedimentation.

  • All solids that settle form the primary sludge while the supernatant forms the effluent.


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