2 (10 points) Asettling tank needs to be constructed to remove 95% (on a mass ba

Question

2 (10 points) Asettling tank needs to be constructed to remove 95% (on a mass basis) of the suspended solids in a 1000. gallons per minute (gpm) water flow taken from a local stream. The stream is fairly clear, so no primary settling tank is used, water is p directly into a coagulation and flocculation process. A laboratory settling test using a 6.0 ft column has provided the following data on the contents and settling of particles in the stream water after they have been through the coagulation and flocculation processes. Fraction of mass collected 3.0% 13% 25 % 42% Settling time (minutes) 10 20

Explanation / Answer

The column was of 6 ft so the depth is 6 ft.

The width is equal to the depth so width is 6 ft.

The length is 4 times the depth so length is 6*4 = 24 ft.

So the dimension of settling tank are 24 ft * 6 ft * 6 ft (length * width * height)

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