CFD simulation of mixing in anaerobic digesters

Mitsuharu Terashima, Rajeev Goel, Kazuya Komatsu, Hidenari Yasui, Hiroshi Takahashi, Y. Y. Li, Tatsuya Noike

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)


A three-dimensional CFD model incorporating the rheological properties of sludge was developed and applied to quantify mixing in a full-scale anaerobic digester. The results of the model were found to be in good agreement with experimental tracer response curve. In order to predict the dynamics of mixing, a new parameter, UI (uniformity index) was defined. The visual patterns of tracer mixing in simulation were well reflected in the dynamic variation in the value of UI. The developed model and methods were applied to determine the required time for complete mixing in a full-scale digester at different solid concentrations. This information on mixing time is considered to be useful in optimizing the feeding cycles for better digester performance.

Original languageEnglish
Pages (from-to)2228-2233
Number of pages6
JournalBioresource Technology
Issue number7
Publication statusPublished - 2009 Apr 1


  • Anaerobic digestion
  • CFD
  • Mixing
  • Rheology

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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