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_______ is formed when alum is added to sewage.

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in Environmental Engineering by (81.4k points)
_______ is formed when alum is added to sewage.

(a) Acid

(b) Floc

(c) Salt

(d) Base

I had been asked this question during an online exam.

Origin of the question is Types of Settling in chapter Sedimentation and Chemical Clarification of Environmental Engineering

1 Answer

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Best answer
Right choice is (b) Floc

For explanation I would say: When a coagulant is added to sewage, then a gelatinous precipitate called floc is formed and flocculent settling takes place.

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