Chapter 4: Activated Sludge Modelling - IqTMA-UVa

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Processes for Biological NitrogenRemoval: Preanoxic Treatment5. Calculate the amount (kg/d) of nitrate fed to the anoxic tank. The designin based on the assumption that all the nitrate fed is reduced.6. Select an anoxic tank HRT (typically 2.5 h) V Anox(Based on Q o)7. Calculate de F/M bbased on the biomass calculated in the nitrificationdesign (X b)8. Estimate SDNR based on the F/M band rbCOD/bCOD ratios (Fig 8-23 inMetcalf & Eddy, 2003). Correct for T and IR9. Using the SDNR adjand the V Anoxselected in step 6 calculate the potentialNO 3-removed. Compared with the amount calculated in step 510. Repeat the procedure from step 6 by selecting a higher or lower V Anox.11. Check alkalinity Balance:[Alkalinity to maintain pH at 7 (typically 80 mgCaCO 3 )] = [ Influent Alk] + [Alkproduced (typically 3.57 g CaCO 3 /g N-NO - 3 reduced)] – [Effluent Alk] – [Alkconsumed (typically 7.14 g CaCO 3 /g N-NH + 4 oxidized)]50
Processes for Biological NitrogenRemoval: Postanoxic TreatmentPostanoxic denitrification can be performed using activated sludgeendogenous respiration. SDNRs range from 0.01-0.04 g N-NO 3-/g MLVSS dTreatment following nitrification (bCOD has been fully depleted)1.42SDNRb kd 0.5kd;where kd2.86decay coefficient andthe fraction ofisthe biomass endogeneousdenitrifying biomassSDNRSDNRSDNRbbbis afunction of 012 . SRT SDNR20º Cb0.706SRT1.08( T 20)51
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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