A step-dose tracer test was conducted on the clear well of a water treatment plant. A constant fluoride dosage of 2.0 mg/l was added at the inlet starting at time zero, and the fluoride concentrations in the outflow were measured and recorded every 5 or 10 min as listed in the following table. Calculate the C/C0 values, plot C/C0 versus t, and determine t10. (Answer t10 = 22 min) HINT: For 7-59, after you plot C/Co vs. time with Co = 2.0 mg/L, to find t10 you look for the value C/Co = 0.1 and this determines t10 on the graph. t10 is the length of time for 10% of the water entering the tank to discharge from the tank. This time is determined by tracer studies.
A step-dose tracer test was conducted on the clear well of a water treatment plant. A constant fluoride dosage of 2.0 mg/l was added at the inlet starting at time zero, and the fluoride concentrations in the outflow were measured and recorded every 5 or 10 min as listed in the following table. Calculate the C/C0 values, plot C/C0 versus t, and determine t10. (Answer t10 = 22 min)
HINT: For 7-59, after you plot C/Co vs. time with Co = 2.0 mg/L, to find t10 you look for the value C/Co = 0.1 and this determines t10 on the graph. t10 is the length of time for 10% of the water entering the tank to discharge from the tank. This time is determined by tracer studies.
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