Abstract
Microalgae-derived oils have potential as a biofuel feedstock. To produce microalgal oils at a large scale, large amounts of nutrients and energy are needed to grow the algae. In this study, we evaluated three types of agricultural fertilizer (AF)-based culture media (AF1, AF2, and AF3) based on a previously published enriched seawater (ES) medium to produce biomass and oils from Thalassiosira sp. Under laboratory conditions, the highest cell productivity of Thalassiosira sp. was obtained with the AF3 medium. Thalassiosira sp. cultured in the AF3 medium produced 10.4 ± 0.9 mg L−1 day−1oils, which is significantly higher than the 5.8 ± 0.7 mg L−1 day−1produced in the ES medium. The higher production was due to the presence of nitrate and trace elements, both of which played roles in enhancing biomass and oil content, respectively. During cell growth, resting spores appeared inside the cells and were a marker to harvest the cells. Because of the abundant availability of sunlight in the tropics during the year, the oil production of Thalassiosira sp. in the AF3 medium was scaled up using outdoor photobioreactors under different weather conditions (rainy and dry seasons). Thalassiosira sp. produced more unsaturated fatty acids during the rainy season and produced more saturated fatty acids during the dry season. This study also demonstrated that it was possible to culture Thalassiosira sp. under outdoor conditions using a low-cost agricultural fertilizer-based culture medium (AF3 medium) to produce biodiesel feedstock with an annual production of 8.1 ± 0.4 t ha−1 during the dry season and of 23.9 ± 6.8 t ha−1 during the rainy season.
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Acknowledgements
We gratefully acknowledge the financial support provided by the Ministry of Research, Technology and Higher Education, the Republic of Indonesia through the Program of Masterplan Percepatan dan Perluasan Pembangunan Indonesia (MP3EI) to ZN, and the Program of Insentif Riset Sistem Inovasi Nasional (INSINAS) to ZN, as well as Beasiswa Pendidikan Pascasarjana Dalam Negeri (BPP-DN) to PK.
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Dedicated to the memory of Dr. Santi Nurbaiti (†29 May 2016)
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Kusumaningtyas, P., Nurbaiti, S., Suantika, G. et al. Enhanced Oil Production by the Tropical Marine Diatom Thalassiosira Sp. Cultivated in Outdoor Photobioreactors. Appl Biochem Biotechnol 182, 1605–1618 (2017). https://doi.org/10.1007/s12010-017-2421-8
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DOI: https://doi.org/10.1007/s12010-017-2421-8