Which is the most practical and economical method for removal of suspended solid matter from polluted water ?
Correct answer: A. Sedimentation
- A. Sedimentation
- B. Skimming off
- C. Chlorination
- D. Biological oxidation
Explanation
Sedimentation removes suspended solids by allowing the denser particles to settle under gravity, making it simple and economical for large water flows. Skimming is limited mainly to floating materials, while chlorination and biological oxidation do not primarily remove suspended solids.
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