GATE Civil Engineering
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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

  1. $9.93$ minutes
  2. $11.93$ minutes
  3. $19.93$ minutes
  4. $21.93$ minutes
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