Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Endogenous decayIf part of the biomass produced is degraded, r g = - Yr su is no longer true!With endogenous decay: r g = -Yr su – k d XWith k d = endogenous coefficient decay (d -1 )r g = Volumetric biomass production rate (g VSS/m 3 d)-Yr su = Rate of biomass production from substrate consumptionk d X = Rate of biomass consumption by endogenous respirationAnd = m S/(K s + S) - k dNote that r su is unchanged!!!!!r su = -r g /Y – k d X/Y = -Y -1 (X + k d X) = - max SX/(Y(K s + S))6
Other models: Maintenance Costsno maintenance requirementmaintenance requirementSubstrate concentrationMicroorganisms will not be able tomultiply at too low substrateconcentration as all the substrate isused for maintenance (or notdetected)Growth rateS concentrationThe growth rate drops when thesubstrate concentration is too highdue to cell inhibition. Examples ofinhibiting substrate are phenolics,acids, and oxygen.7
Page 4 and 5: Solving the Exponential ModelBy sol
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 56 and 57:
Processes for Biological NitrogenRe
Page 58 and 59:
Processes for BiologicalPhosphorous
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Page 62 and 63:
Page 64 and 65:
Activated Sludge ModelingASM nº164
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Biological reaction kineticsMicroor
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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
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In BioWin3Bioreactor Brush aeratorS
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Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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