A surface water treatment plant with coagulation, sedimentation, filtration, and effluent chlorination is being evaluated for compliance with the EPA surface water disinfection regulation. The critical time of the year is during peak demand in the summer when the finished water temperature is 10°C or greater, pH is 8.0 or less, and the turbidity is 0.2-0.3 NTU. Prechlorination cannot be practiced because of trihalomethane formation. Data from the tracer analysis at peak hourly flow through the clear well, which has been modified by installation of baffles to reduce short-circuiting, are given in Problem. After the clear well and prior to the first service connection, the finished water is transported through a pipeline for 4000 ft at a velocity of 5 fps. What chlorine residual is present in the water al the outlet of the pipeline?
Problem:
Flow through a baffled tank was analyzed by injecting a pulse of dye tracer into the influent and measuring the tracer concentrations in the effluent al time intervals of every 2 min after injection. The results are listed below. Sketch the tracer distribution curve by plotting C (mg/l) versus t (min) and locate the mean residence time. Calculate The number of completely mixed tanks in series represented by this residence time distribution
t | C | t | C | t | C | t | C |
0 | 0.00 | 6 | 0.10 | 12 | 0.40 | 18 | 0.05 |
2 | 0.00 | 8 | 0.35 | 14 | 0.22 | 20 | 0.00 |
4 | 0.00 | 10 | 0.65 | 16 | 0.11 |
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