Q.3
Arrange the following steps for "rapid sand filteration” of water for drinking purposes.
(A) . Coagulation and flocculation
(B) . Storage
(C) . Filteration
(D) . Chlorination
Choose the correct answer from the options given below:
- Stages in Municipal Rapid Sand Water Purification:
- Storage / Sedimentation (B): Raw water is stored to allow coarse suspended solids to settle.
- Coagulation and Flocculation (A): Chemical coagulants (alum) are added with rapid mixing to aggregate fine colloidal impurities into settleable flocs.
- Filtration (C): Water passes through a rapid gravity sand and gravel filter bed to remove remaining particulate matter.
- Chlorination (D): Terminal chemical disinfection (gaseous chlorine/bleaching powder) to destroy pathogenic microorganisms and provide residual protection.
- Sequence:
- nalysis:
- ((B), (A), (C), (D)): Correct.
Correct option: (3) (B), (A), (C), (D)
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