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Monitoring the mixing of an artificial model substrate in a scale-down laboratory digester

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  • Conti, Fosca
  • Wiedemann, Leonhard
  • Sonnleitner, Matthias
  • Saidi, Abdessamad
  • Goldbrunner, Markus

Abstract

Investigating the mixing process in digesters is a necessary precursor for successful design, operation, and increased efficiency in biogas plants. However, observation of mixing in digesters under real conditions is complex and cost intensive. Based on the theory of similarity a 1:12 scale digester model is set up and an artificial chemical substrate is selected to mimic the rheology of real biomass. Different mixing regimes are configured using propellers and paddle stirrers located in varying positions. Optical and acoustic techniques are employed to observe the fluid dynamics. In this paper, the laboratory setup and the principal results on the flow velocity, power consumption and torque developed during mixing are presented and discussed. The experimental results illustrate the digester mixing quality in various propeller and stirrer configurations, and are used to validate a numeric computational fluid dynamic study.

Suggested Citation

  • Conti, Fosca & Wiedemann, Leonhard & Sonnleitner, Matthias & Saidi, Abdessamad & Goldbrunner, Markus, 2019. "Monitoring the mixing of an artificial model substrate in a scale-down laboratory digester," Renewable Energy, Elsevier, vol. 132(C), pages 351-362.
    • Handle: RePEc:eee:renene:v:132:y:2019:i:c:p:351-362
    DOI: 10.1016/j.renene.2018.08.013
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    References listed on IDEAS

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    1. Lindmark, Johan & Thorin, Eva & Bel Fdhila, Rebei & Dahlquist, Erik, 2014. "Effects of mixing on the result of anaerobic digestion: Review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 1030-1047.
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    3. Pöschl, Martina & Ward, Shane & Owende, Philip, 2010. "Evaluation of energy efficiency of various biogas production and utilization pathways," Applied Energy, Elsevier, vol. 87(11), pages 3305-3321, November.
    4. Mao, Chunlan & Feng, Yongzhong & Wang, Xiaojiao & Ren, Guangxin, 2015. "Review on research achievements of biogas from anaerobic digestion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 540-555.
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    Cited by:

    1. Buta Singh & Narinder Singh & Zsolt Čonka & Michal Kolcun & Zoltán Siménfalvi & Zsolt Péter & Zoltán Szamosi, 2021. "Critical Analysis of Methods Adopted for Evaluation of Mixing Efficiency in an Anaerobic Digester," Sustainability, MDPI, vol. 13(12), pages 1-27, June.
    2. Ghanimeh, Sophia & Khalil, Charbel Abou & Stoecklein, Daniel & Kommasojula, Aditya & Ganapathysubramanian, Baskar, 2020. "Flow sculpting enabled anaerobic digester for energy recovery from low-solid content waste," Renewable Energy, Elsevier, vol. 154(C), pages 841-848.
    3. Singh, Buta & Szamosi, Zoltán & Siménfalvi, Zoltán, 2019. "State of the art on mixing in an anaerobic digester: A review," Renewable Energy, Elsevier, vol. 141(C), pages 922-936.

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