Semi-continuous lipid production and sedimentation of Scenedesmus sp. by metal ions addition in the anaerobic fermentation effluent. (1st January 2020)

• Record Type: Journal Article
• Authors: Kong, Fanying; Ren, Hong-Yu; Zhao, Lei; Nan, Jun; Ren, Nan-Qi; Liu, Bing-Feng; Ma, Jun
• Is Part Of: Energy conversion and management. Volume 203(2020)
• Publication Date: 2020-01-01
• Subjects: Lipid production -- Microalgal cultivation -- Metal ion -- Sedimentation efficiency -- Waste effluent -- Semi-continuous operation; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2019.112216
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Proper amount of metal ions can promote the algal lipid production and sedimentation. Fe 3+ exhibited better performance than Mg 2+ and Al 3+ in fatty acids medium. Steady lipid accumulation and sedimentation were achieved in semi-continuous mode. The lipid concentration and sedimentation efficiency reached 0.39 g L −1 and 92.7%. Abstract: This study investigated the effects of different metal ions (Mg 2+, Al 3+ and Fe 3+ ) on the growth, lipid accumulation and sedimentation of Scenedesmus sp. in the fatty acids medium. Results showed that appropriate concentrations of Mg 2+ and Fe 3+ can promote the microalgal lipid production and sedimentation in batch culture. Compared with Mg 2+, Fe 3+ was found to be more effective and the biomass concentration of 1.02 ± 0.6 g L −1, lipid content of 31.7 ± 1.7% and sedimentation efficiency of 91.2 ± 2.5% were obtained at 45 μM Fe 3+ . Al 3+ addition can enhance the sedimentation efficiency, while it had inhibitory effect on the biomass and lipid production. Meanwhile, anaerobic fermentation effluent was a suitable feedstock for algal cultivation. The semi-continuous microalgal reactor was steady and efficient, and more than 96% of volatile fatty acids in effluent can be removed. The average lipid concentration and sedimentation efficiency in semi-continuous mode reached 0.39 g L −1 and 92.7%, respectively. This study provides a promising process for enhancing lipid production and waste reduction.