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Study of mixing systems and geometric configurations for anaerobic digesters using CFD analysis

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  • Leonzio, Grazia

Abstract

Anaerobic digester is the most widespread technology for the treatment of biomass to produce biogas. Mixing is an important parameter to have a highly efficient anaerobic digestion. Computational fluid dynamics can provide detailed modeling about the hydrodynamics and mixing of an anaerobic digestion. In this research, a computational fluid dynamics analysis is developed to establish the better geometric configuration and mixing system for an anaerobic digester producing biogas. Three different scenarios as continuous stirred tank reactors are considered. External pumps for liquor recirculation are used as mixing system. Flow patterns, media, variance, standard deviation of average velocity and velocity gradient are used as parameters to evaluate mixing. Simulation results suggest that the innovative configuration in which the fluid enters tangent to the lateral surface of the anaerobic digester is the best solution. Media, variance, standard deviation of average velocity and velocity gradient are equal to 0.01522 m/s, 0.00006 m/s, 0.00758 m/s, 75 s−1 respectively. These ensure to have dead zones equal to the 0.2% of total volume. Shear rate at the bottom is 1.1∙10−3 s−1 in all plane while the power of recirculating pump is 1.9 kw/m3. Computational fluid dynamics is then a promising technology for analyzing mixing.

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  • Leonzio, Grazia, 2018. "Study of mixing systems and geometric configurations for anaerobic digesters using CFD analysis," Renewable Energy, Elsevier, vol. 123(C), pages 578-589.
    • Handle: RePEc:eee:renene:v:123:y:2018:i:c:p:578-589
    DOI: 10.1016/j.renene.2018.02.071
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    References listed on IDEAS

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    1. Kowalczyk, Alexandra & Harnisch, Eva & Schwede, Sebastian & Gerber, Mandy & Span, Roland, 2013. "Different mixing modes for biogas plants using energy crops," Applied Energy, Elsevier, vol. 112(C), pages 465-472.
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    1. Zamani Abyaneh, Ehsan & Zarghami, Reza & Krühne, Ulrich & Rosinha Grundtvig, Inês P. & Ramin, Pedram & Mostoufi, Navid, 2022. "Mixing assessment of an industrial anaerobic digestion reactor using CFD," Renewable Energy, Elsevier, vol. 192(C), pages 537-549.
    2. Zarei, Sasan & Mousavi, Seyyed Mohammad & Amani, Teimour & Khamforoush, Mehrdad & Jafari, Arezou, 2021. "Three-dimensional CFD simulation of anaerobic reactions in a continuous packed-bed bioreactor," Renewable Energy, Elsevier, vol. 169(C), pages 461-472.
    3. 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.
    4. El Ibrahimi, Mohammed & Khay, Ismail & El Maakoul, Anas & Bakhouya, Mohamed, 2021. "Energy performance of an unmixed anaerobic digester with submerged solid waste: Effects of temperature distribution," Energy, Elsevier, vol. 231(C).
    5. Leonzio, Grazia, 2019. "Fluid dynamic study of anaerobic digester: optimization of mixing and geometric configuration by using response surface methodology and factorial design," Renewable Energy, Elsevier, vol. 136(C), pages 769-780.

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