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What is added to the water treatment tank to settle the colloidal particles?

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in Basic Civil Engineering by (111k points)
What is added to the water treatment tank to settle the colloidal particles?

(a) Alum

(b) Alum and lime

(c) Lime

(d) Potash

This question was posed to me in a job interview.

This interesting question is from Wastewater Management in chapter Other Major Topics in Civil Engineering of Basic Civil Engineering

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Correct option is (b) Alum and lime

For explanation: Chemicals like alum and lime are added to the raw water. Then a rapid mix is done to mix the chemicals with the water. After this, it goes into the coagulation unit, where the colloidal particles combine to form a flock.

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