Journal
BIORESOURCE TECHNOLOGY
Volume 143, Issue -, Pages 163-171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.05.043
Keywords
CO2 fixation; Bioethanol; Microalgae; Scenedesmus obliquus; Carbohydrates
Funding
- Taiwan's National Science Council [NSC 101-2221-E-006-094-MY3, 102-3113-P-006-016, 101-3113-P-110-003]
- National Natural Science Foundation of China [51136007]
- Headquarters of University Advancement at the National Cheng Kung University
- Ministry of Education, Taiwan
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Engineering strategies were applied to improve the cell growth, CO2 fixation ability, and carbohydrate productivity of a Scenedesmus obliquus CNW-N isolate. The resulting carbohydrate-rich microalgal biomass was subsequently utilized as feedstock for ethanol fermentation. The microalga was cultivated with 2.5% CO2 in a photobioreactor on different operation modes. Semi-batch operations with 50% replacement of culture medium resulted in the highest CO2 fixation rate (1546.7 mg L-1 d(-1)), carbohydrate productivity (467.6 mg L-1 d(-1)), and bioethanol yield (0.202 g/g biomass). This performance is better than most reported values in the literature. The microalgal biomass can accumulate nearly 50% carbohydrates, as glucose accounted for nearly 80% of the total carbohydrate content. This glucose-predominant carbohydrate composition of the microalga is well suited for fermentative bioethanol production. Therefore, using the proposed carbohydrate-rich microalgal biomass both as the carbon sink and as the feedstock provides a feasible alternative to current carbon-reduction and bioethanol-production strategies. (C) 2013 Elsevier Ltd. All rights reserved.
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