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Question
Consider the following statements regarding removal of impurities from water:
1. Settleable solids are removed by filtration.
2. Volatile solids are removed through sedimentation.
3. Dissolved solids are removed through reverse osmosis.
4. Colloidal solids are removed by coagulation.
Which of the above statements are correct?
A.
1 and 2 only
B.
3 and 4 only
C.
2 and 3 only
D.
1 and 4 only
Answer ( Option B)

3 and 4 only

Solution

1. Settleable solids are generally removed by sedimentation and grit chamber.
2. The residues or waste obtained by sedimentation are directly disposed off which can not be done in case of volatile solids because if volatile solids are disposed off openly then it may decompose and cause pollution.
3. Reverse osmosis removes many types of dissolved and suspended solids.
4. Coagulant aids are added which destabilize the colloidal solids and ultimately makes them settle

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