Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Model presentationMASS BALANCES:• Basic equation for mass balances (in terms of COD)• Input – Output + Reaction = Accumulation Input and Output are transport terms and depend on the systems (e. j. Q xS s) Reaction term for each component obtained by summing the products:r i jand jij wherejthe reaction rates ofijare the stoichiometric coefficientseach particularprocess• The partial derivative for the component will be the sum of biologicalreaction effects and the effects from input and outputs68
Model Presentation• Continuity check• In the transformations there are not unbalances in mass orelectric charge.• This mass conservation can be easily checked in the matrix:The sum of the stoichiometric coefficients for eachtransformation (process) must be zero (consistent units)Remember that Oxygen COD is negative (thestoichiometric coefficient must be multiplied by -1!!69
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Solving the Exponential ModelBy sol
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Endogenous decayIf part of the biom
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Continuous Treatment in wellmixed r
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ExerciseThe growth of a strain of L
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Maximum Dilution Rate: DmaxCell con
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Influence of nbVSSAn amount of non
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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 58 and 59: Processes for BiologicalPhosphorous
Page 64 and 65: Activated Sludge ModelingASM nº164
Page 66 and 67: Biological reaction kineticsMicroor
Page 70 and 71: Components in ASM1Organic matter ch
Page 72 and 73: Components in ASM172
Page 74 and 75: Processes in ASM1Biological process
Page 76 and 77: Organic Matter BiodegradationORGANI
Page 78 and 79: Organic matter biodegradationAerobi
Page 80 and 81: Organic matter biodegradationSlowly
Page 82 and 83: NitrificationNitrification Kinetics
Page 84 and 85: NitrificationAutotrophic biomass de
Page 86 and 87: NitrificationSoluble organic N ammo
Page 88 and 89: DenitrificationHeterotrophic Biomas
Page 90 and 91: Stoichiometric Matrix90
Page 92 and 93: 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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