# The town of Eau Gaullie has requested proposals for a new coagulation water treatment plant. The design flow for the plant is 0.1065 m 3 /s. The average annual water temperature is 19 o C. The following design assumptions for

The town of Eau Gaullie has requested proposals for a new coagulation water treatment plant. The design flow for the plant is 0.1065 m^{3}/s. The average annual water temperature is 19^{o}C. The following design assumptions for a rapid-mix tank have been made:

**1. **Number of tanks = 1 (with 1 backup spare)

**2. **Tank configuration: circular with liquid depth = 2 × diameter

**3. **Detention time = 10 s

**4. **Velocity gradient = 800 s ^{– }^{1}

**5. **Impeller type: turbine, 6 flat blades, *N *_{p}* *= 5.7

**6. **Available impeller diameters: 0.45, 0.60, and 1.2 m

**7. **Assume *B *= (1/3) *H*

Design the rapid-mix system by providing the following:

**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** **

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**Related Book For**

## Engineering Economy

ISBN: 978-0132554909

15th edition

Authors: William G. Sullivan, Elin M. Wicks, C. Patrick Koelling

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