Question

The normal dose of chlorine during break point chlorination is ____________

(a) 0.5-1ppm

(b) 0.1-0.2ppm

(c) 3-7ppm

(d) 1-2ppm

I have been asked this question in homework.

Enquiry is from Forms of Chlorination in chapter Properties of Disinfection of Environmental Engineering

Answer 1

Right option is (b) 0.1-0.2ppm

To elaborate: The normal dose of chlorine during post chlorination is 0.1-0.2ppm. It kills bacteria and oxidizes the organic matter present in water.