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Modelling aerobic granular sludge reactors through apparent half-saturation coefficients.

Janis E Baeten1, Mark C M van Loosdrecht2, Eveline I P Volcke1

  • 1Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Gent, Belgium.

Water Research
|September 23, 2018
PubMed
Summary

Apparent kinetics simplify modeling of aerobic granular sludge by describing macroscale reaction rates. These coefficients, while sensitive to microbial changes, offer practical applications for wastewater treatment design and optimization.

Keywords:
ASMBiofilm modellingDiffusionGranular sludgeHalf-saturation coefficientMonod

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Chemical Engineering

Background:

  • Biological wastewater treatment involves simultaneous diffusion and reactions within microbial aggregates, leading to substrate gradients that limit reaction rates.
  • In activated sludge models (ASM), diffusion limitations are often simplified using lumped parameters like half-saturation coefficients for Monod kinetics.
  • While explicit reaction-diffusion models are common for aerobic granular sludge, this study explores the utility of apparent kinetics.

Purpose of the Study:

  • To investigate the applicability of apparent half-saturation coefficients for aerobic granular sludge.
  • To examine the implications of using apparent kinetics as a simplification.
  • To assess the potential for applying these coefficients in wastewater treatment design and optimization.

Main Methods:

  • A one-dimensional biofilm (1D) model was employed to simulate macroscopic reaction rates.
  • Monod kinetics were fitted to the predicted macroscale rates to derive apparent kinetic parameters.
  • A simplified model for ammonium removal using apparent kinetics was applied to a full-scale reactor.

Main Results:

  • Macroscale reaction rates in aerobic granular sludge can be described using apparent Monod kinetics, particularly when microbial populations are stable.
  • The derived apparent coefficients are sensitive to microbial population distribution and the activity of competing organisms.
  • The study demonstrated the potential application of apparent kinetics for aerobic granular sludge, similar to their use in flocculent and anaerobic systems.

Conclusions:

  • Apparent kinetics offer a viable simplification for modeling aerobic granular sludge, enabling the description of macroscale reaction rates.
  • Despite sensitivity to microbial dynamics, apparent kinetics can be practically applied, especially with recalibration using operational data.
  • The findings suggest that apparent half-saturation coefficients can be valuable tools for the design and optimization of aerobic granular sludge processes in wastewater treatment.