Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Continuous Treatment in wellmixed reactors (CSTR)Under a steady state in a well mixed reactor X = Xr and S = Sr (X and S = concentrations)Under a steady state dX/dt = dS/dt = 0This also means:Q(X – X o ) = P x = biomass production rateQX 0S 0VrXrrSrS rQXSQ(S o – S) = P s = substrate consumption rateVdX r /dt = cell in - cell out + cell produced = QX 0 - QX + r g VFor simplification, X 0 = 0 and by definition r g = µX XV=XQ = Q/VBy definition D = dilution rate = Q/V = µ = 1/HRT (Hydraulic RetentionTime): The growth rate is dictated by the dilution rate.8
S and X in CSTR (no decay)Monod model: µ = µ m S/(K s +S)Under steady state: µ = D, therefore D = µ m S/(K s +S)Solving this equation S = DK s /(µ m – D)S mass balance: VdS/dt = 0 = QS 0 – QS + r su V r su V = - Q(S 0 -S)Since r su V= (-r g /Y)V = - µVX/Y = -DVX/Y = -QX/Y (since D = Q/V) Q(S 0 – S) = QX/Y = DX = Y(S 0 – S)(This could have be obtained directly from the expression of the trueyield)9
Page 4 and 5: Solving the Exponential ModelBy sol
Page 6 and 7: Endogenous decayIf part of the biom
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 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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