Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 13 (Q.No. 1)
A river is the source of water for water supply to a town. Its water is very turbid and polluted. The correct sequence of steps for treating the river water would be :
Presedimentation -> prechlorination -> coagulation -> sedimentation -> filtration -> post chlorination
coagulation -> sedimentation -> post-chlorination
coagulation -> filtration -> sedimentation -> post-chlorination
sedimentation -> post-chlorination
Answer: Option
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