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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. | |