Sewage Treatment Plant objective questions and answers

6. Dried sewage often traetment is used as

   A.Fertilizer

   B.bBuilding material

   C.Chemical for lowering B.O.D.

   D.Base material for paints.

7. The coagulant widely used for sewage treatment is

   A.Ferric chloride

   B.Ferric sulphate

   C.Lime

   D.Alum

8. For the detection of nitrites in the sewage, the matching colour may be developed by adding

   A.Salt

   B.Lime

   C.Potassium permanganate

   D.Sulphuric acid and napthamine

9. The sewage treatment in septic tanks is due to

   A.Anaerobic decomposition

   B.Aerobic decomposition

   C.Parasitic decomposition

   D.None of these

10. The pH value of fresh sewage is usually

   A.Equal to 7

   B.More than 7

   C.Less than 7

   D.Equal to zero

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