Journal
BIORESOURCE TECHNOLOGY
Volume 170, Issue -, Pages 421-427Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.08.017
Keywords
Chlorella pyrenoidosa; Scenedesmus obliquus; Nitrate levels; Fatty acid compositions; Biodiesel quality
Funding
- National High Technology Research and Development Program (863 Program) of China [2013AA065805]
- State Key Laboratory of Motor Vehicle Biofuel Technology
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Biodiesel quality associated with biochemical components of Chlorella pyrenoidosa and Scenedesmus obliquus under different nitrate levels were investigated. The highest lipid contents of 54.5% for C. pyrenoidosa and 47.7% for S. obliquus were obtained in nitrate absence. Carbohydrate peaked at 0.3 g L-1 with values of 40.7% for C. pyrenoidosa and 42.5% for S. obliquus. Protein content seemed species dependent, which decreased substantially to 11.2% in C. pyrenoidosa and 8.8% in S. obliquus under nitrate absence in present research. Better biodiesel quality (e.g. cetane number >58, iodine value <69) could be obtained from C. pyrenoidosa in nitrate absence and S. obliquus in 0.3 g L-1, where the highest saturated fatty acids (39.5 for C. pyrenoidosa, 31.2 for S. obliquus) and the lowest unsaturated fatty acids (60.5 for C. pyrenoidosa, 68.8 for S. obliquus) were obtained. These results suggest that microalgae grown in the presence of nitrogen may limit biodiesel quality. (C) 2014 Elsevier Ltd. All rights reserved.
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