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The contact time for disinfection by combined chlorine is ______________

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The contact time for disinfection by combined chlorine is ______________

(a) 20 minutes

(b) 30 minutes

(c) 40 minutes

(d) 60 minutes

I got this question in an online quiz.

My question comes from Factors Affecting Chlorination in portion Properties of Disinfection of Environmental Engineering

1 Answer

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Best answer
Correct choice is (d) 60 minutes

Easy explanation: The contact time for disinfection by combined chlorine is 60 minutes. The % kill of bacteria depends upon the time of contact between chlorine and microorganism.

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