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An activated sludge plant that treats 4MGD is shown below: Substrate (S) is BOD(mg/L) X is mixed-liquor suspended solids ( mg/) a) Calculate required diameter

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An activated sludge plant that treats 4MGD is shown below: Substrate (S) is BOD(mg/L) X is mixed-liquor suspended solids ( mg/) a) Calculate required diameter of settling tank if design overflow rate is 800gpd/ft2 b) Write a general mass balance around the settling tank to solve for waste flow rate c) Explain why recycle flow is critical to proper biological treatment

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