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The contact time for disinfection by free chlorine is ______________

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+1 vote
in Environmental Engineering by (81.4k points)
The contact time for disinfection by free chlorine is ______________

(a) 20 minutes

(b) 30 minutes

(c) 40 minutes

(d) 60minutes

I have been asked this question by my college director while I was bunking the class.

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

1 Answer

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Best answer
The correct choice is (a) 20 minutes

To explain I would say: The contact time for disinfection by free chlorine is 20 minutes and it depends on pH, temperature, type and concentration of microorganism.

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