### Determine the aeration period and f by m ratio

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Two activated sludge aeration tanks in Podunk, MO are operated in series. Each tank has the follwing dimensions: 7.0 m wide x 28.0 m long x 3.5 m effective liquid depth. The plant operating parameters are:

Flow = 0.0945 m^3/s MLVSS = 1650 mg/L

BOD5 after pimary settling = 135 mg/L MLSS = 1.35 (MLVSS)

Determine the aeration period and F/M ratio for these operating conditions.

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