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 fourvertical baffles and a side water depth equal to the diameter. The velocity gradient anddetention 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 theimpeller diameter to be used, the required rotational speed of the impeller (rpm), and themotor power needed (in W) to turn the impeller.

ANSWER: a) Calculate the total volume: Here, is the design flow rate and is the detention…

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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

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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