Chapter 4: Activated Sludge Modelling - IqTMA-UVa

Influence of nbVSSr VSS = total VSS production rate = r g + QX o,i /V + f d (k d )Xr g = -Yr su – k d X = biomass production from bCOD (-Yr su) minus endogenousdecay (k dX)f d (k d )X = rate of cell debris production with f d= fraction of biomass remainingas cell debris. The cell debris production is directly proportional to thebiomass concentration and k dQX o,i /V = Amount of nbVSS in the influent (Q = influent flow rate, X 0,i= influentnbVSS and V = reactor volume).15