Homework answers / question archive / 1

1

Electrical Engineering

Share With

1. A flocculator is 4.88 m deep, 12.2 m wide and 24.4 m long. The

flow of the water plant is 0.57 m3/s. Rotating paddles are supported parallel to four horizontal shafts. The rotating speed is 2.0 rpm. The center line of the paddles is 1.68 m from the shaft (mid-depth of the basin). Each shaft equipped with six paddles. Each paddle blade is 25 cm wide and 11.6 m long. Assume the mean velocity of the water is 28% of the velocity of the paddles and their drag coefficient is 1.9. Estimate:
(a) the difference in velocity between the paddles and water
(b) the useful power input
(c) the energy consumption per thousand cubic meters
(d) the detention time
(e) the value of G and Gt at 16 0C
(f)  the loading rate of the flocculator