A rapid mix unit is to treat raw water with a flow rate of 36,000 m/d....

 

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A rapid mix unit is to treat raw water with a flow rate of 36,000 m³/d. The particle horizontal velocity should vary by 4.5 m/s for every 5 mm vertical change in depth. If the retention time is 20 s, determine the tank dimensions and the power requirement for the mixer. Assume the following in your calculations: • Square base for the tank • Water depth = 1.3 x tank width 1.0 x 10 Pa.s • Power loss in motor = 40% Power loss in shaft = 30% A rapid mix unit is to treat raw water with a flow rate of 36,000 m³/d. The particle horizontal velocity should vary by 4.5 m/s for every 5 mm vertical change in depth. If the retention time is 20 s, determine the tank dimensions and the power requirement for the mixer. Assume the following in your calculations: • Square base for the tank • Water depth = 1.3 x tank width 1.0 x 10 Pa.s • Power loss in motor = 40% Power loss in shaft = 30%

Answer rating: 100% (QA)

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