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UPSC Civil Service Exam Questions

Q1:

The correct sequence of processes in a water treatment plant for rural water supply is

A Chlorination, aeration, sedimentation, rapid sand filter

B Coagulation, sedimentation, slow sand filter, chlorination

C Coagulation, flocculation, clarification, pressure filter

D Aeration, plain sedimentation, slow sand filter, chlorination

ANS:D - Aeration, plain sedimentation, slow sand filter, chlorination

Coagulation-flocculation is a chemical water treatment technique typically applied prior to sedimentation and filtration (e.g. rapid sand filtration) to enhance the ability of a treatment process to remove particles.



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