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Harvesting of marine microalgae by electroflocculation: The energetics, plant design, and economics

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  • Lee, Andrew K.
  • Lewis, David M.
  • Ashman, Peter J.

Abstract

Microalgae have the potential to be the feedstock for biofuels and laboratory scale electroflocculation was studied as a harvesting technique for marine microalgae. The effects of the electrode separation and mechanical mixing on the energy consumption were also assessed. Results were used to design a commercial scale electroflocculation plant for the estimation of the harvesting cost. By combining electroflocculation with mixing and settling, an overall energy consumption of 0.33MJm−3 has been achieved. On a large scale, the mixing can be made energy efficient by the use of a baffled hydraulic mixer. The total cost for the harvesting, including electrical energy, electrode metal dissolution and capital depreciation, is estimated to be $0.19kg−1 of the ash free dry mass. Hence, electroflocculation has the potential to be more economical than other harvesting techniques for marine microalgae.

Suggested Citation

  • Lee, Andrew K. & Lewis, David M. & Ashman, Peter J., 2013. "Harvesting of marine microalgae by electroflocculation: The energetics, plant design, and economics," Applied Energy, Elsevier, vol. 108(C), pages 45-53.
    • Handle: RePEc:eee:appene:v:108:y:2013:i:c:p:45-53
    DOI: 10.1016/j.apenergy.2013.03.003
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    References listed on IDEAS

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    1. Santori, Giulio & Di Nicola, Giovanni & Moglie, Matteo & Polonara, Fabio, 2012. "A review analyzing the industrial biodiesel production practice starting from vegetable oil refining," Applied Energy, Elsevier, vol. 92(C), pages 109-132.
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    1. Mathimani, Thangavel & Mallick, Nirupama, 2018. "A comprehensive review on harvesting of microalgae for biodiesel – Key challenges and future directions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 1103-1120.
    2. Zhang, Zutao & Zhang, Xingtian & Rasim, Yagubov & Wang, Chunbai & Du, Bing & Yuan, Yanping, 2016. "Design, modelling and practical tests on a high-voltage kinetic energy harvesting (EH) system for a renewable road tunnel based on linear alternators," Applied Energy, Elsevier, vol. 164(C), pages 152-161.
    3. Florian Delrue & Pablo David Álvarez-Díaz & Sophie Fon-Sing & Gatien Fleury & Jean-François Sassi, 2016. "The Environmental Biorefinery: Using Microalgae to Remediate Wastewater, a Win-Win Paradigm," Energies, MDPI, vol. 9(3), pages 1-19, February.
    4. Barros, Ana I. & Gonçalves, Ana L. & Simões, Manuel & Pires, José C.M., 2015. "Harvesting techniques applied to microalgae: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 1489-1500.
    5. Razzak, Shaikh A. & Hossain, Mohammad M. & Lucky, Rahima A. & Bassi, Amarjeet S. & de Lasa, Hugo, 2013. "Integrated CO2 capture, wastewater treatment and biofuel production by microalgae culturing—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 622-653.
    6. Sibi G, 2018. "Microalgae Biomass Harvesting Based on pH Induced, Chemical and Bioflocculants Mediated Flocculation-A Review," International Journal of Environmental Sciences & Natural Resources, Juniper Publishers Inc., vol. 11(3), pages 70-74, May.

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