Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Solving the Exponential ModelBy solving dX/dt = µX :X t = X 0 exp(µ(t - t 0 ))Or ln(X t /X 0 ) = µ(t - t 0 )Doubling time t ½ at which X = 2X 0 ?t ½ = ln2/µ4
The Monod kinetic model = m S/(K s + S)r g = X = [ m S/(K s + S)]Xµ m = maximum specific growth rate (d -1 )K s = saturation or Monod constant (g l -1 )maxmax/2S = limiting substrate (g l -1 )r su = -r g /Y = X/Y = max SX/(Y(K s +S))KsSubstrate concentrationThe cell growth rate (and therefore the substrate removal rate) increaseswith the substrate concentration, up to a certain level when it stabilize at m . If the limiting substrate concentration is low: conditions of slow growth!5
Page 6 and 7: Endogenous decayIf part of the biom
Page 8 and 9: Continuous Treatment in wellmixed r
Page 10 and 11: ExerciseThe growth of a strain of L
Page 12 and 13: Maximum Dilution Rate: DmaxCell con
Page 14 and 15: Influence of nbVSSAn amount of non
Page 16 and 17: Influence of nbVSSFraction of activ
Page 18 and 19: Biomass retentionCell washout is mo
Page 20 and 21: AerationSurfaceDiffused$$$ Aeration
Page 22 and 23: Many configuration possible!The A2/
Page 24 and 25: OverviewApplicationCostsAdvantagesD
Page 26 and 27: Solid Retention Time (SRT)The SRT i
Page 28 and 29: Expression of SBiomass balance:VdX/
Page 30 and 31: Total mixed liquor VSS (MLVSS)MLVSS
Page 32 and 33: ..and if we have nitrification??P M
Page 34 and 35: Processes for BOD Removal andNitrif
Page 44 and 45: Processes for Biological NitrogenRe
Page 52 and 53:
Processes for Biological NitrogenRe
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Processes for BiologicalPhosphorous
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Activated Sludge ModelingASM nº164
Page 66 and 67:
Biological reaction kineticsMicroor
Page 68 and 69:
Model presentationMASS BALANCES:•
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Components in ASM1Organic matter ch
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Components in ASM172
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Processes in ASM1Biological process
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Organic Matter BiodegradationORGANI
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Organic matter biodegradationAerobi
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Organic matter biodegradationSlowly
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NitrificationNitrification Kinetics
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NitrificationAutotrophic biomass de
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NitrificationSoluble organic N ammo
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DenitrificationHeterotrophic Biomas
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Stoichiometric Matrix90
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Conclusions• The Model works at c
Page 94 and 95:
In BioWin3Bioreactor Brush aeratorS
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Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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