Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Processes for BOD Removal andNitrification12. Check alkalinity Balance:Alkalinity to maintain pH at 7 (typically 80 mgCaCO 3/L) = Influent Alk –Effluent Alk – Alk consumed (typically 7.14 g CaCO 3/g N-NH 4+)13. Design secondary clarifier (chapter 6) Area based on desktopdesign approach or model based Xr RAS flow rateQ + Q rXQ rX rQX e 0QrXrQrR Q ( Q Q ) XRAS R XrrX X36
Processes for BOD Removal andNitrificationProcess Configuration for BOD Removal Exclusively• Suitable when space is limited• When nitrification is not needed to meet treatment discharge limitsA) High purity oxygenSRT 1- 4 days / HRT 1-3 h• O 2absorption 2-3 times greaterthan conventional AS• Enclosed systems• Higher MLSS and Organicloading rates• Shorter HRT Low reactor V• Inhibition of Nitrification due toCO 2accumulation low pH• High Invest and Operation Costs37
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 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
Page 64 and 65: Activated Sludge ModelingASM nº164
Page 66 and 67: Biological reaction kineticsMicroor
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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