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Flow pattern visualization in a mimic anaerobic digester: experimental and computational studies.

M S Vesvikar1, R Varma, K Karim

  • 1Bioprocessing and Bioengineering Laboratory, Chemical Reaction Engineering Laboratory, Department of Chemical Engineering, Washington University, St Louis, MO 63130, USA. muthanna@che.wustl.edu

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|September 27, 2005
PubMed
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Computational fluid dynamics (CFD) simulations and non-invasive experiments optimized anaerobic digester design. Increasing draft tube diameter and using conical bottoms reduced dead zones, improving digester efficiency.

Area of Science:

  • Biochemical Engineering
  • Fluid Dynamics
  • Process Engineering

Background:

  • Optimizing mixing and flow patterns in anaerobic digesters is crucial for efficient biogas production.
  • Understanding hydrodynamic parameters is key to improving digester performance and reducing dead zones.

Purpose of the Study:

  • To visualize flow patterns and obtain hydrodynamic parameters in mimic anaerobic digesters.
  • To evaluate the impact of different digester configurations on flow patterns and dead zone volumes using computational fluid dynamics (CFD).

Main Methods:

  • Non-invasive experiments: Computer automated radioactive particle tracking and computed tomography.
  • Computational fluid dynamics (CFD) simulations of gas-sparged mimic anaerobic digesters.
  • Analysis of various digester configurations, including draft tube size, clearance, and bottom shape.

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Main Results:

  • CFD simulation results for flow patterns, circulation cells, stagnant regions, and dead zones showed good agreement with experimental data.
  • Increasing draft tube diameter and adopting a conical bottom design significantly reduced dead zone volumes compared to flat-bottom designs.
  • Changes in draft tube clearance and height did not influence flow patterns or dead zone volumes.

Conclusions:

  • Digester design, specifically draft tube diameter and bottom shape, significantly impacts hydrodynamic efficiency.
  • Conical bottoms and larger diameter draft tubes are recommended for minimizing dead zones in anaerobic digesters.
  • Gas flow rate from a single-point sparger had a negligible effect on the overall digester flow pattern.