Abstract
The rising global demand for energy and the decreasing stocks of fossil fuels, combined with environmental problems associated with greenhouse gas emissions, are driving research and development for alternative and renewable sources of energy. Algae have been gaining increasing attention as a potential source of bio-renewable energy because they grow rapidly, and farming them does not, generally, compete for agricultural land use. Previous studies of algal biofuels have focused on microalgae because of their fast growth rate and high lipid content. Here we analyze the multiple merits of biofuel production using macroalgae, with particular reference to their chemical composition, biomass and biofuel productivity, and cost-effectiveness. Compared to microalgae, macroalgae have lower growth rates and energy productivity but higher cost-effectiveness. A biomass productivity of over 73.5 t dry mass ha−1 year−1 with a methane yield of 285 m3 t−1 dry mass would make electricity production from macroalgae profitable, and this might be achieved using fast-growing macroalgae, such as Ulva. Taking into account the remediation of eutrophication and CO2, exploring macroalgae for a renewable bioenergy is of importance and feasible.
About the authors
Guang Gao received his PhD at Newcastle University, UK. He is an associate professor at Xiamen University. He is working on the interaction between marine primary producers and environmental changes, referring to algal use in food, biofuel and bioremediation for CO2 rise and eutrophication.
James Grant Burgess received his PhD at Imperial College, University of London. He is a professor of marine biotechnology at Newcastle University, UK. He is interested in novel bioactive compounds from marine bacteria, chemical defense in marine microbes, antifouling compounds from marine bacteria, microbiology of deep sea sediments, and sponge microbiology.
Min Wu is a postgraduate student at Jiangsu Ocean University. She is working on biofuel and bioactive compounds from microalgae.
Shunjun Wang received her PhD at Nanjing Agricultural University, China. She is a professor at Jiangsu Ocean University. Her research fields are marine microbiology and bioactive compounds from marine organisms.
Kunshan Gao obtained his PhD at Kyoto University, Japan. He is currently a chair professor at Xiamen University, China. His research focuses on physiological ecology and photobiology of phytoplankton, with special reference to the interactive effects of CO2 rise (and associated ocean acidification) and solar UV radiation on aquatic primary producers.
Acknowledgements
This study was supported by the National key R&D program of China (2016YFA0601400), the Lianyungang Innovative and Entrepreneurial Doctor Program (201702), the Jiangsu Planned Projects for Postdoctoral Research Funds (1701003A), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX19_0951), and the Priority Academic Program Development of Jiangsu Higher Education Institutions of China.
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