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A wastewater is to be disinfected with 35 mg/L of chlorine to obtain 99% kill of micro-organisms. The number of micro-organisms remaining alive (Nt) at time t, is modelled by Nt=N0e−kt, where N0 is number of micro-organisms at t=0, and k is the rate of kill. The wastewater flow rate is 36 m3/h, and k=0.23min−1. If the depth and width of the chlorination tank are 1.5 m and 1.0 m, respectively, the length of the tank (in m, round off to 2 decimal places) is8.0089

Answer» A wastewater is to be disinfected with 35 mg/L of chlorine to obtain 99% kill of micro-organisms. The number of micro-organisms remaining alive (Nt) at time t, is modelled by Nt=N0ekt, where N0 is number of micro-organisms at t=0, and k is the rate of kill. The wastewater flow rate is 36 m3/h, and k=0.23min1.

If the depth and width of the chlorination tank are 1.5 m and 1.0 m, respectively, the length of the tank (in m, round off to 2 decimal places) is
  1. 8.0089


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