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Question
Which one of the following pollutants are generally not removed in a sewage treatment plant?
A.
Inorganic suspended solids
B.
Dissolved organic solids
C.
Oil and grease
D.
Dissolved inorganic solids
Answer ( Option D)

Dissolved inorganic solids

Solution

Pollutants removed:
1. Inorganic suspended solids
2. Dissolved organic solids
3. Oil and grease
Process of treatment:
(a) Primary sedimentation tank
(b) Trickling filter, Activated sludge process
(c) Skimming tank
Dissolved inorganic solids are not removed in water treatment process.

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