Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Processes for BOD Removal andNitrificationComputational Step for a correct Design of an AS process:1. Wastewater Characterization (bCOD, nbVSS, etc.)2. Effluent requirements [N-NH 4+], TSS, bCOD3. Nitrification safety factor (normally peak/average TKN loading ratio)4. Select a design DO in the aeration basin (typically 2 mg/L)5. Determine the specific growth rate for nitrifyiers, that due to their lowgrowth control AS design, based on DO and effluent [N-NH 4+]n nmN Kn NKoDO kDO6. Obtain the SRT corrected by the safety factor7. Obtain the effluent bCOD from Heterotrophic GrowthdnSRT1nS = Ks(1 + (k d)SRT)/(SRT(µ m– k d) – 1)34
Processes for BOD Removal andNitrification8. Determine Biomass Production (P XBio). Estimated NO 3-as 80 % TKNPXBioQY( So S)fdkdQY( So S)SRT QYn( NO3)1k SRT 1k SRT 1k SRTddnd9. N balance to calculate NO 3-(Find the real NO 3-production based onthe N removed during biomass growth)10. Calculate the TOTAL VSS and TSS mass in the aeration basinP MLVSS= r gHV (Heterotrophic X) + r gNV (Nitrifying bacteria) + r dV (debris) +QX 0,I(nbVSS)P MLSS=[ r gHV (Heterotrophic X) + r gNV (Nitrifying bacteria) + r dV (debris) +QX 0,I(nbVSS)]/0.85 + Q (TSS o-VSS o)11. Select a design MLSS concentration (Typically 2500-3500 mg/L for agood settler performance) and determine the aeration volume andHRTX VSSV = (P MLVSS)SRT35
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 36 and 37: 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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