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<p>Producing microalgal biodiesel with both high lipid productivity and enhanced fuel properties remains an important challenge. The variability in lipid accumulation and biofuel potential among microalgae grown in diverse culture conditions insufficiently characterized. So Addressing this knowledge gap is essential for optimizing microalgal biodiesel to be competitive with traditional fuels. In this study, six microalgal strains and their mixed culture were selected, because they are commonly found, easy to obtain from diverse environments, adaptable for co-cultivation, and possess acceptable lipid content, to evaluate whether species diversity and complementary traits could improve biomass production, lipid accumulation, and biodiesel quality across different cultivation media. The strains and their consortium were cultivated in standard BG-11, bicarbonate-supplemented BG-11, and synthetic municipal wastewater (SMW). This study shows that the mixed culture grown in modified BG-11 have the highest lipid productivity at 35.27&#xa0;mg L⁻¹ day⁻¹, compared with 33.26&#xa0;mg L⁻¹ day⁻¹ in standard BG-11 and 16.16&#xa0;mg L⁻¹ day⁻¹ in SMW. In contrast, nitrogen-limited SMW promoted higher lipid accumulation in some monocultures, while mixed culture improved growth stability and increased the monounsaturated fatty acid content to approximately 50–52% across media. FAME analysis further revealed that modified BG-11 and SMW promoted more favorable saturated and monounsaturated fatty acid profiles, resulting in improved biodiesel properties, with the cetane number (58.8) obtained for the mixed culture in modified BG-11. The findings show that culture medium and mixed-cultivation significantly influence lipid productivity and biodiesel quality in microalgal systems.</p>

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Comparative Evaluation of Culture Medium and Mixed Culture Effects on Microalgal Biomass, Lipid Productivity, and Biodiesel Quality

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Mohammad Amin Fazel,
  • Sara Mahdavi,
  • Farid Hosseini,
  • Sahand Azadvar,
  • Omid Tavakoli

摘要

Producing microalgal biodiesel with both high lipid productivity and enhanced fuel properties remains an important challenge. The variability in lipid accumulation and biofuel potential among microalgae grown in diverse culture conditions insufficiently characterized. So Addressing this knowledge gap is essential for optimizing microalgal biodiesel to be competitive with traditional fuels. In this study, six microalgal strains and their mixed culture were selected, because they are commonly found, easy to obtain from diverse environments, adaptable for co-cultivation, and possess acceptable lipid content, to evaluate whether species diversity and complementary traits could improve biomass production, lipid accumulation, and biodiesel quality across different cultivation media. The strains and their consortium were cultivated in standard BG-11, bicarbonate-supplemented BG-11, and synthetic municipal wastewater (SMW). This study shows that the mixed culture grown in modified BG-11 have the highest lipid productivity at 35.27 mg L⁻¹ day⁻¹, compared with 33.26 mg L⁻¹ day⁻¹ in standard BG-11 and 16.16 mg L⁻¹ day⁻¹ in SMW. In contrast, nitrogen-limited SMW promoted higher lipid accumulation in some monocultures, while mixed culture improved growth stability and increased the monounsaturated fatty acid content to approximately 50–52% across media. FAME analysis further revealed that modified BG-11 and SMW promoted more favorable saturated and monounsaturated fatty acid profiles, resulting in improved biodiesel properties, with the cetane number (58.8) obtained for the mixed culture in modified BG-11. The findings show that culture medium and mixed-cultivation significantly influence lipid productivity and biodiesel quality in microalgal systems.