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__________ is the application of chlorine at two or more points in the purification process.

(a) Plain chlorination

(b) Pre chlorination

(c) Super chlorination

(d) Double chlorination

I had been asked this question in quiz.

I want to ask this question from Forms of Chlorination in section Properties of Disinfection of Environmental Engineering

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The correct option is (d) Double chlorination

The best I can explain: Double chlorination is the application of chlorine at two or more points in the purification process. It is applied just before when the water enters the sedimentation tank and after when it leaves the filter plant.

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