Rectangular pre-sedimentation tanks are to be used to remove grit and sand from river water in...

Rectangular pre-sedimentation tanks are to be used to remove grit and sand from river water in a water treatment plant that produces 24000 m3/d drinking water.

Use an overflow rate of 20 m3/m2.d and a weir loading rate of 220 m3/m.d and a detention time of 4 hrs. A minimum of two tanks are to be used. Find the following:

a. The surface area of each tank.

b. Tank dimensions ( L*W*H), use width to length ratio of 4:1, Maximum length 40 m,

c. Find the required weir length. Suggest a configuration of weirs to achieve the required weir length if the tank width is not enough.

d. What is the horizontal velocity in the tank?

Solutions

Expert Solution

Ally Wells answered 10 months ago

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