As an environmental engineer working for a consulting company you were asked to evaluate an existing water treatment plant for possible upgrade. One of the treatment unit processes you evaluated was...

Extracted text: As an environmental engineer working for a consulting company you were asked to evaluate an existing water treatment plant for possible upgrade. One of the treatment unit processes you evaluated was the rapid mix tank. You had the following information. 2. Current average water flow rate 15 x 10' m'/d. Projected flow rate in 20 years 24 x 10' m'/d. Temperature of water varies from 12 to 20° C. No. of rapid mix tank = 1 Dimension of tank: water depth 2.1 m, width 2.1 m, length 2.1 m Tank is not baffled: Mixer is 4-bladed turbine with 45° pitched blade (N, = 1.27) Diameter of impeller 0.9 m Label on the motor: horsepower of motor 10 hp (1 hp 746 watts) rpm of blades = 120 rpm (assume a motor efficiency of 80%) Evaluate whether the rapid mix system (1) Is sufficiently designed for current use? If not, provide some remedies. (i) Will the current system be sufficient for the projected flow rate in 20 years? If not, what are some of your suggestions or additions to meet the projected flow?