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Why Alum is preferred over other coagulants?

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in Environmental Engineering by (81.4k points)
Why Alum is preferred over other coagulants?

(a) It is easy to dewater the sludge formed

(b) It imparts corrosiveness to water

(c) It reduces taste and odor in addition to turbidity

(d) The time required for floc formation is less

I had been asked this question in exam.

My enquiry is from Sedimentation with Coagulation in chapter Sedimentation of Environmental Engineering

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Best answer
Correct option is (c) It reduces taste and odor in addition to turbidity

The best I can explain: Alum is preferred over other coagulants because it reduces the taste and odor in addition to turbidity and produce lighter flocs that can be broken easily.

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