Determine the minimum necessary horizontal area for an activated-sludge aerator operating under the following conditions

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Determine the minimum necessary horizontal area for an activated-sludge aerator operating under the following conditions:
Volumetric flow rate: 3400 m3 /day
Aerator depth: H = 7 m
Incoming substrate concentration: Sin = 300 mg/L
Exiting substrate concentration: Sout no more than 25 mg/L
Half-concentration constant: KS = from 50 mg/L in winter to 60 mg/L in summer
Cell growth rate: km = from 1.3 /day in winter to 2.0 /day in summer
Cell death rate: kd = 0.05 /day
Yield rate: Y = 0.65
Recycle ratio: R = 0.20
Cell concentration ratio in recycled substrate: Xu /X = 5