The 'aeration tank' in activated sludge process is designed based on:
Choose the correct answer
Only physical settling time
F/M ratio (food to microorganism ratio), BOD loading, MLSS, and HRT using biological kinetics
Only tank volume without any biological parameter
Rainfall intensity
Correct Answer
B. F/M ratio (food to microorganism ratio), BOD loading, MLSS, and HRT using biological kinetics
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Aeration tank design: using F/M ratio (Food-to-Microorganism) = substrate removal rate / MLSS × detention time. F/M = 0.2–0.4 kg BOD/kg MLSS/day for conventional ASP; 0.05 for extended aeration. Or volumetric BOD loading (0.4–0.8 kg/m³/day). Detention time HRT = 6–8 hours (conventional). Organic removal, sludge production, and oxygen requirement calculated from kinetics.
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