Effects of Nitrogen Forms and Supply Mode on Lipid Production of Microalga Scenedesmus obliquus

Mei An, Li Gao, Wen Zhao, Weiguang Chen and Ming Li
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Mei An: College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Li Gao: SouthEast Water, 101 Wells Street, Frankston, VIC 3199, Australia
Wen Zhao: College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Weiguang Chen: College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Ming Li: College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China

Energies, 2020, vol. 13, issue 3, 1-13

Abstract: Optimization of the microalgae culture conditions could significantly reduce the production costs of microalgae-derived biodiesel. In the current study, a new process of adding different forms using the multiple small-dose method was employed. The effects of different forms of nitrogen (NaNO 3 , NH 4 Cl, and CH 4 N 2 O) and their concentrations (0.1, 0.5, 1, and 2 mg L −1 ) on the growth and lipid production of Scenedesmus obliquus were studied. Algae density and lipid production increased with increasing nitrogen concentration for all different forms of nitrogen except NH 4 Cl. The Scenedesmus obliquus growth was promoted by adding NaNO 3 and CH 4 N 2 O, but was inhibited by adding NH 4 Cl. Adding 2 mg N L −1 of CH 4 N 2 O daily yielded the highest cell density (1.7 × 10 7 cells mL −1 ) and lipid production (242.4 mg L −1 ). These conditions can thus maintain the biomass of Scenedesmus obliquus , increase its lipid accumulation, and decrease the costs of biodiesel production.

Keywords: Scenedesmus obliquus; nitrogen forms; supply mode; biodiesel; lipid production; lutein (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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