Optimization of outdoor cultivation of the marine microalga Nannochloropsis gaditana in flat-panel reactors using industrial exhaust flue gases
Journal of Applied Phycology(2019)
摘要
The market for microalgae is substantial and currently expanding. To meet this demand, it is necessary to demonstrate the feasibility of large-scale biomass production over long periods. This study aims to demonstrate the feasibility and sustainability of a semi-industrial process for the outdoor cultivation of the microalga Nannochloropsis gaditana in flat-panel reactors using flue gases on demand from a coal-fired power plant. To this end, four secondary objectives were defined: (i) To generate an accurate estimate of the annual average biomass production using this process; (ii) To determine how the production rate and the biochemical composition of the biomass vary with the weather conditions over the course of a year; (iii) To reduce operational costs by developing a new culture medium based on natural seawater enriched with agricultural fertilizers; and (iv) To increase the productivity yield by optimizing the air flow rate in outdoor flat-panel reactors. This research is relevant because it fills an information gap in the available literature regarding experimentation with outdoor microalgae culture, on a semi-industrial scale, using flue gases, for a period of 2 full years. Results showed that biomass production and growth rate range from 0.040 ± 0.022 g (dry weight) L −1 d −1 and 0.088 ± 0.044 d −1 to 0.078 ± 0.033 g dwt L −1 d −1 and 0.179 ± 0.079 d −1 , respectively, depending on the environmental conditions. Protein and lipid content range from 34.4 ± 8.163 to 43.5 ± 13.250% dry weight and from 12.5 ± 2.243 to 14.4 ± 0.936% dwt, respectively. The culture was maintained during a complete cycle of two years, with the stated conditions, and demonstrated the technical feasibility and sustainability of the process.
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关键词
Nannochloropsis gaditana, Semi-industrial scale, Biochemical composition, Flue gases, Culture medium
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