Pick out the true statement pertaining to water treatment ?
Correct answer: D. Normally, the turbidity is removed by adding a coagulant prior to sedimentation
- A. Slow sand filters can remove colour completely
- B. Activated carbon can be used for taste & odour control without subsequent filtration
- C. Application of activated carbon reduces the temporary hardness of water
- D. Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Explanation
Coagulation destabilises suspended particles, allowing them to form flocs that are removed by subsequent sedimentation. Activated carbon targets taste and odour, while it does not normally remove temporary hardness.
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