### What is the aeration time for an f/m of 0.35

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Determine the volume of three identical activated sludge tanks following primary clarification to aerate 36,000 m cubed/d with a BOD concentration of 180 mg/l at a BOD loading of 560 g/m cubed*d. What is the aeration time? For an F/M of 0.35, what MLSS concentration should be maintained in the aeration tanks?

Estimate the operating sludge age, assuming an effluent suspended solids of 30 mg/l and the daily amount of waste activated sludge solids. If the waste sludge has a concentration of 10000 mg/l, what is the calculated volume of sludge to be wasted each day?

Determine the dimensions of three identical rectangular clarifiers (length, width, and side water depth) with a 2:1 length to width ratio.

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