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Modeling phototrophic biofilms in a plug-flow reactor.

J D Muñoz Sierra1, C Picioreanu2, M C M van Loosdrecht3

  • 1Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC, Delft, The Netherlands E-mail: J.D.MunozSierra@tudelft.nl; Department of Water Management, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands.

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Summary
This summary is machine-generated.

Phototrophic biofilms show promise for wastewater treatment, but numerical models reveal heterotrophs can outcompete other microbes. This finding impacts the design of novel bioreactor configurations for efficient contaminant removal.

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Area of Science:

  • Environmental microbiology
  • Biochemical engineering
  • Computational fluid dynamics

Background:

  • Phototrophic biofilms offer a sustainable approach to wastewater treatment.
  • Understanding microbial dynamics within biofilms is crucial for optimizing bioreactor performance.

Purpose of the Study:

  • To develop and implement a numerical model for simulating phototrophic biofilm processes in wastewater treatment.
  • To investigate the impact of operational conditions on chemical oxygen demand (COD) and ammonia conversion.

Main Methods:

  • A two-dimensional biofilm model was coupled with a one-dimensional plug-flow bulk liquid model in COMSOL Multiphysics.
  • Model parameters, including light half-saturation and oxygen mass transfer coefficients, were tuned.
  • Simulations assessed spatial distribution of microbial species and contaminant removal efficiencies.

Main Results:

  • The oxygen mass transfer coefficient significantly influences substrate conversion rates.
  • Heterotrophic bacteria were found to dominate biofilms under high organic loading rates (<2.32 gCOD/(m(2) d)).
  • This overgrowth limits the effectiveness of combined phototrophic and heterotrophic/autotrophic systems.

Conclusions:

  • Mechanistic modeling is essential for elucidating microbial interactions in wastewater treatment biofilms.
  • Bioreactor design must account for microbial competition to maximize treatment efficiency.
  • The study highlights limitations for integrating phototrophs with heterotrophs/autotrophs in certain wastewater scenarios.