Question

The number of  organisms in disinfection process can be expressed by ____________

(a) C^n *t p = Constant

(b) C ^n / tp = Constant

(c) C ^q * Np = Constant

(d) C ^q / Np = Constant

I have been asked this question in an internship interview.

This intriguing question originated from Kinetics of Chemical Disinfection topic in chapter Properties of Disinfection of Environmental Engineering

Answer 1

Right answer is (c) C ^q * Np = Constant

To explain I would say: The number of  organisms in disinfection process can be expressed by C^q * Np = Constant where, C is the concentration of disinfectant, the Np is the reduced concentration of organisms and q is the coefficient of disinfectant strength.