A 40-hp surface aerator was tested in a 120-ft-diameter tank with a water depth of 8.0 ft. Cobalt chloride catalyst and sodium sulfite were added to the tap water in the tank to remove the dissolved oxygen. The water temperature was 21.9°C, and the dissolved-oxygen saturation was 8.7 mg/l. During the test, the average electric power usage was 33.1 k W, which at 90% efficiency is equivalent to 40.0 hp. From the following time and dissolved- oxygen data, determine the value of KLa corrected to 20° C, and calculate the oxygen transfer rate in pounds per horsepower-hour.
t (min) | Ct(mg/l) | t (min) | Ct(mg/I) |
0 | 0 | 23 | 6.5 |
2 | 1.0 | 28 | 7.1 |
4 | 1.9 | 33 | 7.5 |
6 | 2.7 | 38 | 7.7 |
8 | 3.1 | 43 | 7.9 |
13 | 4.9 | 48 | 8.0 |
18 | 5.9 | 58 | 8.3 |
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