1.

Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves 50 percent of disinfection efficiency measured in terms of killing the indicator microorganisms (E-Coli) in 3 minutes. The minimum time required to achieve 99 percent disinfection efficiency would be

A. 9.93 minutes
B. 11.93 minutes
C. 21.93 minutes
D. 19.93 minutes
Answer» E.


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