Problem

Your boss has assigned you the job of designing a rapid-mix tank for the new water treat...

Your boss has assigned you the job of designing a rapid-mix tank for the new water treatment plant for the town of Waffle. The design flow rate is 0.050 m3 /s. The average water temperature is 8oC. The following design assumptions for a rapid-mix tank have been made:

1. Number of tanks = 1 (with 1 backup)

2. Tank configuration: circular with liquid depth = 1.0 m

3. Detention time = 5 s

4. Velocity gradient = 750 s 1

5. Impeller type: turbine, 6 flat blades, N p = 3.6

6. Available impeller diameters: 0.25, 0.50, and 1.0 m

7. Assume B = (1/3) H

Design the rapid-mix system by providing the following:

1. Water power input in kW

2. Tank dimensions in m

3. Diameter of the impeller in m

4. Rotational speed of impeller in rpm

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Solutions For Problems in Chapter 3