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A rectangular horizontal-flow sedimentation basin in a conventional water treatment plant has been designed to treat...

A rectangular horizontal-flow sedimentation basin in a conventional water treatment plant has been designed to treat a flow of 50,000 m3 /day. It has a length = 80 m, width = 20 m, and depth = 3.6 m. For this problem, assume temperature = 20 °C (density of water = 103 kg/m3 and viscosity = 10-3 kg/m·s) and laminar flow.

a. What is the hydraulic detention time? Does this meet the typical criteria for this type of sedimentation basin?
b. What is the overflow rate?
c. What is the diameter of smallest particle that will be completely removed, assuming ideal conditions (no short-circuiting, currents, etc.), if the particles have a specific gravity of 2.5?
d. Calculate the Reynolds number of the settling particles in part (c). Are the particles settling in laminar flow as was stated in the assumption above?

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