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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 : |
A. | Presedimentation -> prechlorination -> coagulation -> sedimentation -> filtration -> post chlorination |
B. | coagulation -> sedimentation -> post-chlorination |
C. | coagulation -> filtration -> sedimentation -> post-chlorination |
D. | sedimentation -> post-chlorination |
Answer» B. coagulation -> sedimentation -> post-chlorination | |