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Improving the Energy Balance of Hydrocarbon Production Using an Inclined Solid–Liquid Separator with a Wedge-Wire Screen and Easy Hydrocarbon Recovery from Botryococcus braunii

Author

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  • Kenichi Furuhashi

    (Department of Biological and Environmental Engineering, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)

  • Fumio Hasegawa

    (Department of Biological and Environmental Engineering, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)

  • Manabu Yamauchi

    (Toyo Screen Kogyo Co., Ltd. 2-10-6, Kozen, Ikaruga-cho, Ikoma-gun, Nara 636-0103, Japan)

  • Yutaka Kaizu

    (Department of Biological and Environmental Engineering, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)

  • Kenji Imou

    (Department of Biological and Environmental Engineering, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)

Abstract

The green colonial microalga Botryococcus braunii produces large amounts of hydrocarbons and has attracted attention as a potential source of biofuel. When this freshwater microalga is cultured in a brackish medium, the hydrocarbon recovery rate increases; furthermore, the colony size becomes large. In this study, the effects of such changes on the energy balance of harvesting and hydrocarbon recovery were studied via filtrate experiments on an inclined separator and extraction from a concentrated slurry. The inclined separator was effective for harvesting large-colony-forming algae. The water content on the wire screen of slit sizes larger than 150 µm was <80% and a separation rate of >85% could be achieved. The input energy of the harvesting using the brackish medium with this separator was ≈44% of that using the freshwater medium with vacuum filtration, while the input energy of the hydrocarbon recovery using the brackish medium was ≈88% of that using the freshwater medium with pre-heating before n -hexane extraction. Furthermore, the energy profit ratio of the process in the brackish medium was 2.92, which was ≈1.2 times higher than that in the freshwater medium. This study demonstrated that filtration techniques and hydrocarbon recovery from B. braunii with a low energy input through culture in a brackish medium are viable.

Suggested Citation

  • Kenichi Furuhashi & Fumio Hasegawa & Manabu Yamauchi & Yutaka Kaizu & Kenji Imou, 2020. "Improving the Energy Balance of Hydrocarbon Production Using an Inclined Solid–Liquid Separator with a Wedge-Wire Screen and Easy Hydrocarbon Recovery from Botryococcus braunii," Energies, MDPI, vol. 13(16), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4139-:d:397084
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    References listed on IDEAS

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    1. Shuai Zhang & Yuyong Hou & Zhiyong Liu & Xiang Ji & Di Wu & Weijie Wang & Dongyuan Zhang & Wenya Wang & Shulin Chen & Fangjian Chen, 2020. "Electro-Fenton Based Technique to Enhance Cell Harvest and Lipid Extraction from Microalgae," Energies, MDPI, vol. 13(15), pages 1-14, July.
    2. Kita, K. & Okada, S. & Sekino, H. & Imou, K. & Yokoyama, S. & Amano, T., 2010. "Thermal pre-treatment of wet microalgae harvest for efficient hydrocarbon recovery," Applied Energy, Elsevier, vol. 87(7), pages 2420-2423, July.
    3. Riaru Ishizaki & Ryozo Noguchi & Agusta Samodra Putra & Sosaku Ichikawa & Tofael Ahamed & Makoto M Watanabe, 2020. "Reduction in Energy Requirement and CO 2 Emission for Microalgae Oil Production Using Wastewater," Energies, MDPI, vol. 13(7), pages 1-20, April.
    4. Kalpesh K. Sharma & Holger Schuhmann & Peer M. Schenk, 2012. "High Lipid Induction in Microalgae for Biodiesel Production," Energies, MDPI, vol. 5(5), pages 1-22, May.
    5. Saga, Kiyotaka & Hasegawa, Fumio & Miyagi, Syoko & Atobe, Sueko & Okada, Shigeru & Imou, Kenji & Osaka, Noriko & Yamagishi, Tetsu, 2015. "Comparative evaluation of wet and dry processes for recovering hydrocarbon from Botryococcus Braunii," Applied Energy, Elsevier, vol. 141(C), pages 90-95.
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    Cited by:

    1. José C. M. Pires & Ana L. Gonçalves, 2022. "Microalgae Cultures: Environmental Tool and Bioenergy," Energies, MDPI, vol. 15(16), pages 1-4, August.

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