Simulation and performance evaluation of the anoxic/anaerobic/aerobic process for biological nutrient removal

  • Zhen Zhou
  • Zhichao Wu
  • Zhiwei Wang
  • Shujuan Tang
  • Guowei Gu
  • Luochun Wang
  • Yingjun Wang
  • Zhiling Xin


As a modified configuration of the conventional anaerobic/anoxic/aerobic (AAO) process, a novel anoxic/anaerobic/aerobic (Reversed AAO, RAAO) process has been extensively applied in domestic wastewater treatment plants (WWTP). In this study, the Activated Sludge Model No. 2d (ASM2d) and a secondary clarifier model were calibrated and applied to simulate a pilot-scale RAAO test and evaluate the operational performance of the RAAO process. For calibration of the biological model ASM2d, only four kinetic parameters were adjusted to accurately simulate in-process variations of ammonium, nitrate and phosphate. Simulation results by the calibrated model demonstrated that phosphorus accumulating organisms (PAO) in the RAAO process (0.243 gP·(gCOD)−1) contains less poly-phosphate than the AAO process (0.266 gP·(gCOD)−1). With the increasing mixed liquor recirculation ratio in the RAAO process, the fraction of heterotrophic biomass and autotrophic biomass both increased, whereas the PAO decreased owing to adverse effects of electron acceptors on phosphorus release and poly-hydroxy-alkanoates synthesis.

Key words

Wastewater Treatment Biological Nutrient Removal Simulation Activated Sludge Calibration 


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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2011

Authors and Affiliations

  • Zhen Zhou
    • 1
  • Zhichao Wu
    • 2
  • Zhiwei Wang
    • 2
  • Shujuan Tang
    • 2
  • Guowei Gu
    • 2
  • Luochun Wang
    • 1
  • Yingjun Wang
    • 1
  • Zhiling Xin
    • 1
  1. 1.School of Energy and Environmental EngineeringShanghai University of Electric PowerShanghaiChina
  2. 2.State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and EngineeringTongji UniversityShanghaiChina

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