Flow through a compartmented aeration tank was analyzed by injecting a pulse of lithium chloride tracer in the influent. From the time and output concentration data listed, plot C (kg/m3) versus t (min), the tracer response curve. Calculate the location of the mean residence time, t, variance of the curve or2, and the number of completely mixed tanks in series that is represented by the distribution.
t | C | t | C | t | C | t | C |
0 | 0 | 105 | 89.0 | 210 | 33.5 | 315 | 6.0 |
15 | 0 | 120 | 95.0 | 225 | 25.8 | 330 | 4.6 |
30 | 0 | 135 | 88.0 | 240 | 20.0 | 345 | 3.5 |
45 | 3.5 | 150 | 78.2 | 255 | 15.4 | 360 | 2.6 |
60 | 16.5 | 165 | 65.0 | 270 | 12.1 | 375 | 1.7 |
75 | 46.5 | 180 | 55.2 | 285 | 9.5 | 390 | 0.7 |
90 | 72.0 | 195 | 43.0 | 300 | 7.5 | 405 | 0 |
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