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 out- flow 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 f10.
t (min) | c (mg/l) | t (min) | c (mg/l) | t (min) | c (mg/l) |
0 | 0 | 25 | 0.42 | 55 | 1.53 |
5 | 0 | 30 | 0.70 | 65 | 1.65 |
10 | 0 | 35 | 0.88 | 75 | 1.84 |
15 | 0 | 40 | 1.15 | 85 | 1.82 |
20 | 0.10 | 45 | 1.28 | 95 | 1.85 |
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