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Environmental Engineering Research 2019;24(2): 271-278. DOI: https://doi.org/10.4491/eer.2018.193
Advances in microalgal biomass/bioenergy production with agricultural by-products: Analysis with various growth rate models
Hee-Jeong Choi1  , and Seo-Yun Lee2
1Department of Health and Environment, Catholic Kwandong University, Gangneung 25601, Republic of Korea
2Department of Physics, Kangwon National University, Chuncheon 24341, Republic of Korea
Corresponding Author: Hee-Jeong Choi ,Tel: +82-33-649-7297, Fax: +82-33-647-7635, Email: hjchoi@cku.ac.kr
Received: May 29, 2018;  Accepted: July 28, 2018.
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Mass cultivation of microalgae is necessary to achieve economically feasible production of microalgal biodiesel. However, the high cost of nutrients is a major limitation. In this study, corncob extract (CCE) was used as an inorganic and organic nutrient source for the mass cultivation of Chlorella vulgaris (C. vulgaris). Chemical composition analysis of CCE revealed that it contained sufficient nutrients for mixotrophic cultivation of C. vulgaris. The highest specific grow rate of C. vulgaris was obtained at pH of 7-8, temperature of 25-30°C, and CCE amount of 5 g/L. In the analysis using various growth models, Luong model was found to be the most suitable empirical formula for mass cultivation of C. vulgaris using CCE. Analysis of biomass and production of triacyglycerol showed that microalgae grown in CCE medium produced more than 17.23% and 3% more unsaturated fatty acids than cells cultured in Jaworski’s Medium. These results suggest that growing microalgae in CCE-supplemented medium can increase lipid production. Therefore, CCE, agricultural byproduct, has potential use for mass cultivation of microalgae.
Keywords: Agricultural waste | Biomass | Carbon source | Corncob | Microalgae | Mixotrophic
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