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Numerical multiphase modeling of CO2 absorption and desorption in microalgal raceway ponds to improve their carbonation efficiency

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  • Ali, Haider
  • Park, Cheol Woo

Abstract

The carbonation efficiency in raceway ponds was improved by modeling CO2 desorption and absorption between the pond and the atmosphere. The Euler–Euler two-fluid method was used to model gas–liquid flow mixing with mass transfer in the raceway pond. The average gas hold-up, mass transfer coefficient, dissolved CO2 concentration, CO2 desorption rate to the atmosphere, and CO2 absorption rate from the atmosphere were investigated using the effects of sump configuration, pond geometry, and gas–liquid hydrodynamic properties. The carbonation efficiency of the entire raceway pond was investigated by considering the effects of sump geometrical design, aspect ratio, water depth, paddle wheel rotational speed, gas bubble size, and gas mass flux. The CO2 desorption and absorption rates were estimated using novel equations from the literature. Results showed that the CO2 desorption rate was low in wide and shallow raceway ponds. The gas–liquid mass transfer increased in ponds with a low aspect ratio and small water depths. The high rotational speeds of the paddle wheel enhanced gas dissolution, and large amounts of CO2 were desorbed to the atmosphere. Moreover, sump configuration as well as geometrical and gas–liquid hydrodynamic properties significantly affected the carbonation efficiency and algal productivity.

Suggested Citation

  • Ali, Haider & Park, Cheol Woo, 2017. "Numerical multiphase modeling of CO2 absorption and desorption in microalgal raceway ponds to improve their carbonation efficiency," Energy, Elsevier, vol. 127(C), pages 358-371.
    • Handle: RePEc:eee:energy:v:127:y:2017:i:c:p:358-371
    DOI: 10.1016/j.energy.2017.03.143
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    References listed on IDEAS

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    1. Soman, Abhinav & Shastri, Yogendra, 2015. "Optimization of novel photobioreactor design using computational fluid dynamics," Applied Energy, Elsevier, vol. 140(C), pages 246-255.
    2. Ketheesan, B. & Nirmalakhandan, N., 2011. "Development of a new airlift-driven raceway reactor for algal cultivation," Applied Energy, Elsevier, vol. 88(10), pages 3370-3376.
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    Cited by:

    1. Ousmane Wane & Julián A. Ramírez Ceballos & Francisco Ferrera-Cobos & Ana A. Navarro & Rita X. Valenzuela & Luis F. Zarzalejo, 2022. "Comparative Analysis of Photosynthetically Active Radiation Models Based on Radiometric Attributes in Mainland Spain," Land, MDPI, vol. 11(10), pages 1-25, October.
    2. Haider Ali & Dongda Zhang & Jonathan L. Wagner & Cheol Woo Park, 2018. "Two-Phase Flow Modeling of Solid Dissolution in Liquid for Nutrient Mixing Improvement in Algal Raceway Ponds," Energies, MDPI, vol. 11(4), pages 1-21, April.
    3. Haider Ali & Taqi Ahmad Cheema & Cheol Woo Park, 2018. "Determination of the Structural Characteristics of Microalgal Cells Walls under the Influence of Turbulent Mixing Energy in Open Raceway Ponds," Energies, MDPI, vol. 11(2), pages 1-19, February.

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