an impeller-powered flocculation basin is to be designed for a tertiary treatment plant for
a flow of 94,600 m3/d. The plant is to employ alum coagulation and pertinent data for the
flocculation basin are as follows: detention time = 20 min, G = 35 s-1 (at 10 oC), GT =
10,000 to 100,000, width = 1.25 times depth, length = twice width, no baffling, number of
impellers = 2, number of blades per impeller = 6, pitched at 45o, impeller diameter = 30%
of basin width, KL = 70.0, and KT = 1.65. Determine: