$6-41.$ design the flocculation tank by providing the following for the first two compartments only:

Water power input in kW

Tank dimensions in $m$

Diameter of the impeller in $m$

Rotational speed of impeller in rpm

Use the following assumptions:

Number of tanks $=$ two

Tapered $G$ in three compartments: $90,60,$ and $30s^{-1}$

WATER TREATMENT

$379$

$G=120,000$

Compartment length $=$ width $=$ depth

Impeller type: axial$-$flow impeller, three blades, $N_P=0\mathrm{.}31$

Available impeller diameters: $1\mathrm{.}0,1\mathrm{.}5,$ and $2\mathrm{.}0$ m

Assume $B=\frac{1}{3}H$

Answers for first compartment only:

$P=295\mathrm{.}31,or295Wor0\mathrm{.}295kW$

$L=W=D=3\mathrm{.}3m$

Impeller diameter $=1\mathrm{.}5m$

Rotational speed $=30rpm$