Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Processes for Biological NitrogenRemoval: Preanoxic TreatmentKey design parameters of Anoxic/Aerobic reactors:• Anoxic HRT• [MLSS]• Internal Recycle and RAS• [bCOD]• [rbCOD]• TemperatureTwo design approaches:1- Nitrogen mass balances and the parameter SDNR (g N-NO 3-reduced/ gMLVSS d)2- ASM models46
Processes for Biological NitrogenRemoval: Preanoxic TreatmentSpecific Denitrification Rate (SDNR)• The amount of nitrate removed in the anoxic tank is:NOx Vwhere VanoxanoxSDNR specific denitrification rate (g N - NOMLVSS (g/m SDNR [MLVSS],is anoxic3)tank volume (m3)-3SDNR SDNR20 1.026/g MLVSS d)In full-scale facilities SDNR range from 0.04–0. 42 g N-NO 3-/g MLVSS d( T 20)SDNR is a function of: Temperature ( ) ratiorbCOD/bCOD, and the F/M bratio defined as the ratio of the influent BODloading rate to Active Heterotrophic BiomassF / MbQ SoV XanoxbNote: Active biomass X b is calculated as described in the BOD removal and nitrification section47
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

Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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