Question

Choose the correct option(s) for removing solids from water.

• A. chlorination
• B. coagulation-flocculation-sedimentation followed by slow sand filtration
• C. chlorination followed by aeration
• D. slow sand filtration

Hint:

Remember: - Use coagulation-flocculation-sedimentation for suspended solids. - Use filtration for fine solids. - Use chlorination for killing microorganisms — not solids!

Answer 1

The Correct Option is B, D

Step 1: Understand roles of each treatment method.
Chlorination is used for disinfection — it targets pathogens, not solids.
Coagulation, flocculation, and sedimentation are classical methods to remove suspended solids.
Slow sand filtration is a physical process effective in removing fine particulates.

Step 2: Evaluate options.
(A) is incorrect: chlorination does not remove solids.
(B) is correct: standard process chain for solids removal.
(C) is incorrect: aeration and chlorination are not aimed at solid removal.
(D) is correct: slow sand filtration is effective for solids.