Horizontal shaft paddle wheels are used in a tapered flocculation basin comprised of three compartments. the power input to the paddles progressively decreases through the basin with the first compartment paddle driving with 186 w of power, the second compartment paddle with 30.0 w of power, and the final compartment paddle with 7.50 w of power. each paddle wheel mixes a compartment 4.17 m deep, 3.75 m wide, and 4.17 m long. the normal water temperature is 15 ? c, and average flow rate is 16,000 m3/d.

(a) what is the mixing intensity in each of the three compartments?

(b) if the influent water contains a nearly monodisperse (single-sized) particle size distribution of 20.0 ? m particles with a concentration of 1.8 × 105 particles/ml, what will be the average number of singlet particles in an aggregate leaving the first compartment?

note that viscosity of water is 0.00114 kg/m? s.