Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
Correct answer: A. Chemical coagulation
- A. Chemical coagulation
- B. Circular clarifier
- C. Mechanical flocculation
- D. Sedimentation tank
Explanation
Very fine particles and colloids remain suspended because they have low settling velocities and surface charges that prevent aggregation. Chemical coagulation neutralises these charges and forms larger flocs that can then be removed by settling.
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