Perspectives on engineering strategies for improving biofuel production from microalgae — A critical review |
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| Authors: | Shih-Hsin Ho Xiaoting Ye Tomohisa Hasunuma Jo-Shu Chang Akihiko Kondo |
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| Affiliation: | 1. Organization of Advanced Science and Technology, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan;2. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan;3. Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan;4. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan;5. Center for Bioscience and Biotechnology, National Cheng Kung University, Tainan 701, Taiwan;6. Biomass Engineering Program, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan |
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| Abstract: | ![]()
Although the potential for biofuel production from microalgae via photosynthesis has been intensively investigated, information on the selection of a suitable operation strategy for microalgae-based biofuel production is lacking. Many published reports describe competitive strains and optimal culture conditions for use in biofuel production; however, the major impediment to further improvements is the absence of effective engineering strategies for microalgae cultivation and biofuel production. This comprehensive review discusses recent advances in understanding the effects of major environmental stresses and the characteristics of various engineering operation strategies on the production of biofuels (mainly biodiesel and bioethanol) using microalgae. The performances of microalgae-based biofuel-producing systems under various environmental stresses (i.e., irradiance, temperature, pH, nitrogen depletion, and salinity) and cultivation strategies (i.e., fed-batch, semi-continuous, continuous, two-stage, and salinity-gradient) are compared. The reasons for variations in performance and the underlying theories of the various production strategies are also critically discussed. The aim of this review is to provide useful information to facilitate development of innovative and feasible operation technologies for effectively increasing the commercial viability of microalgae-based biofuel production. |
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| Keywords: | Microalgae Biofuel Environmental stress Engineering operation strategy Fed-batch operation Semi-continuous operation Continuous operation Two-stage operation Salinity-gradient operation |
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