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Dynamic modeling of activated sludge process

Dynamic modeling of activated sludge process. POSTECH Department of Chemical Engineering PSE Lab. 1. Modeling of Activated Sludge Process. IAWQ activated sludge model No.1 Secondary settler modeling Integrated modeling Benchmark study model (predenitrification process). Effluent.

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Dynamic modeling of activated sludge process

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  1. Dynamic modeling of activated sludge process POSTECH Department of Chemical Engineering PSE Lab.

  2. 1. Modeling of Activated Sludge Process • IAWQ activated sludge model No.1 • Secondary settler modeling • Integrated modeling • Benchmark study model (predenitrification process)

  3. Effluent Aerobic reactor Raw wastewater CO2 , H2O NO3, SO4 , PO4 Secondary settler New biomass Activated sludge + Wastewater + O2 Wastage sludge Recycle sludge 1.1 Outline of Activated Sludge Process

  4. 1.2 Modeling • Bioreactor modeling • IAWQ (International Association on Water Quality) Activated sludge model No.1 (1987, Henze et al.) • Secondary settler modeling • Solid flux theory (1986, Vitasovic) and double exponential velocity theory (1991, Takâcs) • Integrated modeling (predenitrification process) • COST682 Working group : Benchmark study model

  5. 1.3 IAWQ ASM No.1 (1) • 13 components • Microorganisms (XBH, XBA) • Carbonaceous compounds (SI, SS, XI, XS, XP) • Nitrogenous compounds (SNO, SNH, SND, XND) • Auxiliary states (SO, SALK) • 8 reactions • Oxidation of organic carbon, Nitrification, Denitrification, etc. • Basic structure (mass balance)

  6. 1.4 IAWQ ASM No.1 (2)

  7. 1.5 IAWQ ASM No.1 (3) • Important equations

  8. V0 Settling velocity V0’ I II III IV Concentration 1.6 Modeling of Secondary Settler • Solid flux theory (bulk movement + gravity settling) • Double exponential-velocity theory

  9. 1.7 General Settler Model Limiting solid flux

  10. 1.8 Integrated Modeling • Combination of reactor and settler (fraction equality) • Predenitrification process • Advanced wastewater treatment process (nitrogen removal) • The most economic nitrogen removal process (1991, Henze) • Benchmark study model (COST 682 & 624 Group) • Five-compartment reactor and secondary settler

  11. Wastewater Biological reactor Settler Effluent Qe, Ze m = 10 Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Qf, Zf m = 6 Anoxic section Aerated section Internal recycle m = 1 Qa, Za Qu, Zu Qr, Zr External recycle Wastage Qw, Zw 1.9 Benchmark Study Model

  12. 1.10 Simulation Results Storm-weather condition

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