Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Maximum Dilution Rate: DmaxCell concentrationCell concentrationS1Output of cells DxS2SubstrateconcentrationmaxSubstrateconcentrationmaxDilution rateDilution rateCSTR: = D = Q/VAt washout condition: S = S 0 = D max K s /(µ m – D max )D max = m S 0 /(K s + S 0 ) = m /(1 + K s / S 0 )Cell wash-out occurs at too high dilution rates (D >D max ) and is especiallysensitive at low initial substrate concentration.12
Influence of endogenous decayNow = mS/(K s+S) – k dS: The biomass balance is identical, hence: D = = m S/(K s +S) – k d . Solving this equationgives: S = K s(D + k d)/( m– D – k d)S mass balance: VdS/dt = 0 = QS 0 – QS + r su Vr su = -r g /Y-k d X/Y = -X/Y-k d X/Y = -X(D + k d ) /YSolving this equation gives: X = YD(S 0– S)/(D + k d) = Y(S 0– S)/(1 + k d/D)D max is obtained for S = S 0 = K s (D + k d )/( m – D – k d )Solving this equation gives D max = m /(1 + K s /S 0 ) - k d13
Page 4 and 5: Solving the Exponential ModelBy sol
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 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 58 and 59: Processes for BiologicalPhosphorous
Page 60 and 61: Processes for BiologicalPhosphorous
Page 62 and 63:
Processes for BiologicalPhosphorous
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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
Page 94 and 95:
In BioWin3Bioreactor Brush aeratorS
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Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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