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?

Expert Solution

Ally Wells answered 1 year ago

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