Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Biological reaction kineticsMicroorganisms decay:• Considered as 1 st order kineticsRate ofdecay bX• Physiological aspects described by decay: cell lysis andendogenous respiration and predationEnvironmental factors (organic substrate, O 2, etc..) that affect growth:Required substances: Modelled as switching functions thatactivate or deactivate reactions if the substance is present orabsent:SKOOK SK SOOGrowth Rates are described by simple Monod KineticsArrhenius functions: to show the influence of environmentalfactors such as TOO66
ASM StructureDefinitionsThe model is presented in a matrix format (Petersen matrix)ComponentXbSsSoProcess rateProcess ↓1 Growth1-1/Y(1-Y)/Y·Ss·Xb/(Ks+Ss)2 Decay-1-1b·XbComponents: (column) All the substances involved in transformations(processes)Processes : (rows) Transformations that take place in the system• Stoichiometric coefficients (relationship between components)• Kinetic expressions (rate equations for processes)67
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Solving the Exponential ModelBy sol
Page 6 and 7:
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
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 58 and 59: Processes for BiologicalPhosphorous
Page 64 and 65: Activated Sludge ModelingASM nº164
Page 68 and 69: Model presentationMASS BALANCES:•
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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