2) A drinking water treatment plant is disinfecting their water with free chlorine. The pH is...

   

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2) A drinking water treatment plant is disinfecting their water with free chlorine. The pH is 8, temperature is 20 C, and the peak hourly flow is 2 million gallons per day (MGD). The water is chlorinated on its way into a baffled storage tank, and then is pumped through one mile of pipe (12 inches of diameter) to reach the first customer. The residual chlorine concentration from the effluent of the storage tank is 0.5 mg/L, and the residual chlorine concentration at the first customer's location is 0.25 mg/L. A step tracer for the peak horly flow was conducted on the baffled storage tank with an input tracer concentration of 2 mg/L. Data for this tracer study are shown as follows. Plot the data and determine the T0 (min). Calculate the CT for the storage tank. Tracer 0 0.04 0.1 0.15 0.26 0.36 0.48 0.62 0.76 0.92 1.08 1.24 (mg/L) Time 10 15 20 25 30 35 40 45 (min) 50 55 60 65 2) A drinking water treatment plant is disinfecting their water with free chlorine. The pH is 8, temperature is 20 C, and the peak hourly flow is 2 million gallons per day (MGD). The water is chlorinated on its way into a baffled storage tank, and then is pumped through one mile of pipe (12 inches of diameter) to reach the first customer. The residual chlorine concentration from the effluent of the storage tank is 0.5 mg/L, and the residual chlorine concentration at the first customer's location is 0.25 mg/L. A step tracer for the peak horly flow was conducted on the baffled storage tank with an input tracer concentration of 2 mg/L. Data for this tracer study are shown as follows. Plot the data and determine the T0 (min). Calculate the CT for the storage tank. Tracer 0 0.04 0.1 0.15 0.26 0.36 0.48 0.62 0.76 0.92 1.08 1.24 (mg/L) Time 10 15 20 25 30 35 40 45 (min) 50 55 60 65