F/M Ratio Calculator

Calculate Food to Microorganism ratio for activated sludge process control

Influent Parameters

Influent BOD (mg/L)

Influent Flow (m3/day)

MLSS Concentration (mg/L)

Aeration Tank Volume (m3)

MLVSS/MLSS Ratio

0.143 kg BOD/kg MLVSS/day

Extended Aeration

BOD Loading2000.0 kg/day

MLVSS2800 mg/L

Biomass (MLSS)17500.0 kg

Biomass (MLVSS)14000.0 kg

F/M (based on MLSS)0.114

Organic Loading Rate0.400 kg BOD/m3/day

Estimated SRT14.0 days

Oxygen Required2400.0 kg O2/day

Sludge Yield1000.0 kg VSS/day

High Rate> 1.0

Conventional0.2-0.5

Complete Mix0.2-0.6

Extended Aeration0.05-0.15