Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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You’re working on a preliminary design for a water treatment plant expansion for Fell City.  The required capacity is 12 MGD (million gallons per day).  The TSS of the sedimentation basin effluent is 16 mg/L of TSS.  Assume the effluent TSS is 0 mg/L.

(a)  Based on a filtration rate of 2 gpm/ft2, how big (area) must the filters be?

(b)  If 3% of the treated water is used for backwashing, what would the backwash TSS be?  (Set up a mass balance analysis.)

(c)  How many tons of sludge (dry solids) would be generated in 30 days? 

Answers:  4170 ft2, 533 mg/L, 24 ton

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