Question

The water is free from oxidizable materials. What is the dosage of ozone required?

(a) 0.01ppm

(b) 0.1-0.2ppm

(c) 0.2-0.3ppm

(d) 0.4-0.5ppm

This question was posed to me in an online quiz.

I would like to ask this question from Iodine, Bromine and Ozone Treatment topic in chapter Properties of Disinfection of Environmental Engineering

Answer 1

The correct option is (c) 0.2-0.3ppm

To explain I would say: A dosage of 0.2-0.3ppm is required to kill the coliform bacteria present in water which is free from oxidizable materials.