In this work, the two-stage cultivation of Chlorella sp. HS2 for enhancing the lipid productivity was optimized by adjusting the duration of nitrogen-replete (N+) and -deplete (N-) stages within a 9 day period using urea as nitrogen source. The highest lipid content of 36.7% and productivity of 216.9 mg L d were obtained under five days of N+ followed by four days of N- conditions. Replenishing phosphorus and other nutrients (N-P+O+) at the beginning of the nutrient-starvation resulted in 1.55 and 1.68-folds improvement in lipid productivities compared to the single stage and zero nutrient controls (N-P-O-), respectively. The estimated biodiesel properties based on the fatty acid profiles met all criteria of international standards. The findings of this study indicate that properly adjusting the period of nitrogen availability as well as the presence of other nutrients is highly important in order to maximize the biofuel productivity in two-stage microalgal cultivation.
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Article Synopsis
- - Microalgae are promising microorganisms that can produce a variety of valuable compounds, like proteins and antioxidants, due to their rapid growth and ability to utilize CO2 and wastewater, making them sustainable for various industries like bioenergy and cosmetics.
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- - Future research should focus on improving cultivation methods, real-time monitoring for better yield, and conducting large-scale experiments to analyze the sustainability and economic feasibility of microalgal applications.
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