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Two identical sedimentation tanks are to be designed for an activated sludge plant with a flow...

Two identical sedimentation tanks are to be designed for an activated sludge plant with a flow of 2 MGD (flow is split evenly between the two clarifiers). The MLSS will be 1950 mg/L. The underflow (return sludge) concentration will be 12,000 mg/L. A settling curve was developed (using a column with Ho = 2.13 ft) and is shown below. For clarification area use a safety factor of 2.0 and for thickening area use a safety factor of 1.5. Tanks are available in 5-ft increments. What is the design diameter (ft)?

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