Chapter 4: Activated Sludge Modelling - IqTMA-UVa
Chapter 4: Activated Sludge Modelling - IqTMA-UVa
Chapter 4: Activated Sludge Modelling - IqTMA-UVa
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Solid Retention Time (SRT)The SRT is defined as the average time the solids stay inside theaeration tank. When VSS = active cells (X), the SRT is also calledMean Cell Retention Time (MCRT) with:SRT =Amount of active biomass in the systemProduction rate of active biomassAmount of active biomass = VX (kg)The production rate can be obtained from the biomass mass balanceunder steady state as X out – X in = Production withXout = Q e X e + Q w X wXin = Q 0 X 0SRT for BOD removal 3 day at 18-25 ºC or 5-6 at 10 ºC26
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