# Continuing the preparation of the proposal for the Waffle treatment plant ( problem 6 - 1 5

## Question:

Continuing the preparation of the proposal for the Waffle treatment plant $($problem $6-15),$

design the flocculation tank by providing the following for the first two compartments only:

$1.$ Water power input in kW

$2.$ Tank dimensions in m

$3.$ Diameter of the impeller in m

$4.$ Rotational speed of impeller in rpm

Use the following assumptions:

$1.$ Number of tanks $=\text{}1\text{}($with $1$ backup$)$

$2.$ Tapered G in three compartments: $60,\text{}50,$ and $20$ s$-1$

$3.$ Detention time $=\text{}30$ min

$4.$ Depth $=\text{}3\mathrm{.}5$ m

$5.$ Impeller type: axial$-$flow impeller, three blades, N p $=\text{}0\mathrm{.}43$

$6.$ Available impeller diameters: $1\mathrm{.}0,\text{}1\mathrm{.}5,$ and $2\mathrm{.}0$ m

$7.$ Assume B $=\text{}(1/3)$ H

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