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Hydraulic optimization of membrane bioreactor via baffle modification using computational fluid dynamics.

Xiaoxu Yan1, Kang Xiao2, Shuai Liang1

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.

Bioresource Technology
|December 4, 2014
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Summary

Baffles in airlift membrane bioreactors (MBRs) improve membrane surface shear for fouling control. Optimized baffle placement and size significantly enhance shear stress, especially at lower aeration levels.

Keywords:
Airlift membrane bioreactorBaffleComputational fluid dynamicsHydrodynamicsMembrane surface shear

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Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Biotechnology

Background:

  • Baffles are crucial in airlift membrane bioreactors (MBRs) for enhancing membrane surface shear.
  • Effective shear stress management is key to controlling membrane fouling in MBRs.

Purpose of the Study:

  • To investigate the impact of baffle location and size on hydrodynamics.
  • To optimize baffle configuration for enhanced membrane surface shear in MBRs.

Main Methods:

  • Computational Fluid Dynamics (CFD) simulations were employed.
  • Hydrodynamics in a bench-scale airlift flat sheet MBR were analyzed.
  • Simulations were validated for accuracy.

Main Results:

  • Side baffles demonstrated greater effectiveness in increasing membrane surface shear compared to front baffles.
  • Optimized baffle configuration, combining front and side baffles with adjusted size, maximized average shear stress.
  • The optimized baffle setup increased shear stress by 10-30% over non-baffled configurations at equivalent aeration intensities.
  • Baffle effectiveness was most pronounced at lower aeration intensities.

Conclusions:

  • Strategic placement and sizing of baffles are critical for optimizing MBR performance.
  • Baffles offer a viable method for enhancing fouling control in MBRs through improved hydrodynamics.
  • The study provides a basis for designing more efficient MBR systems with baffles.