A rapid-mixing basin for coagulation is to be designed for a water treatment plant. The design flow rate for the basin is 3800 m³/d. The basin will be cylindrical with four vertical baffles and a side water depth equal to the diameter. The velocity gradient and detention time will be 1000 s' and 5 s, respectively. Assume the water temperature is 10°C. (a) Calculate the basin dimensions in increments of 0.01 m. (b) A radial turbine impeller with a power number of 5.7 will be used to provide mixing, and the following impeller diameters are available (in m): 0.3, 0.4, 0.6. Determine the impeller diameter to be used, the required rotational speed of the impeller (rpm), and the motor power needed (in W) to turn the impeller.
A rapid-mixing basin for coagulation is to be designed for a water treatment plant. The design flow rate for the basin is 3800 m³/d. The basin will be cylindrical with four vertical baffles and a side water depth equal to the diameter. The velocity gradient and detention time will be 1000 s' and 5 s, respectively. Assume the water temperature is 10°C. (a) Calculate the basin dimensions in increments of 0.01 m. (b) A radial turbine impeller with a power number of 5.7 will be used to provide mixing, and the following impeller diameters are available (in m): 0.3, 0.4, 0.6. Determine the impeller diameter to be used, the required rotational speed of the impeller (rpm), and the motor power needed (in W) to turn the impeller.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![A rapid-mixing basin for coagulation is to be designed for a water treatment plant.
The design flow rate for the basin is 3800 m³/d. The basin will be cylindrical with four
vertical baffles and a side water depth equal to the diameter. The velocity gradient and
detention time will be 1000 s' and 5 s, respectively. Assume the water temperature is 10°C.
2.
(a) Calculate the basin dimensions in increments of 0.01 m.
(b) A radial turbine impeller with a power number of 5.7 will be used to provide mixing,
and the following impeller diameters are available (in m): 0.3, 0.4, 0.6. Determine the
impeller diameter to be used, the required rotational speed of the impeller (rpm), and the
motor power needed (in W) to turn the impeller.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F63e6afdd-fcc3-4f21-b02a-f5513ef0190b%2F1224efab-4091-415a-9aea-747a2acb6646%2Ftbww7yf_processed.png&w=3840&q=75)
Transcribed Image Text:A rapid-mixing basin for coagulation is to be designed for a water treatment plant.
The design flow rate for the basin is 3800 m³/d. The basin will be cylindrical with four
vertical baffles and a side water depth equal to the diameter. The velocity gradient and
detention time will be 1000 s' and 5 s, respectively. Assume the water temperature is 10°C.
2.
(a) Calculate the basin dimensions in increments of 0.01 m.
(b) A radial turbine impeller with a power number of 5.7 will be used to provide mixing,
and the following impeller diameters are available (in m): 0.3, 0.4, 0.6. Determine the
impeller diameter to be used, the required rotational speed of the impeller (rpm), and the
motor power needed (in W) to turn the impeller.
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