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Bioactive substances and specific light wavelengths significantly boost microalgal growth. Optimizing CO₂ injection further enhances biomass production, crucial for industrial and environmental applications.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Phycology

Background:

  • Microalgae are vital for ecosystems and industry, but enhancing their productivity is challenging.
  • Optimizing biomass yield, cultivation time, and quality requires further research.

Purpose of the Study:

  • To assess the impact of bioactive substances, light wavelengths, and CO₂ injection on four microalgal species.
  • To identify optimal conditions for improving microalgal growth and biomass production.

Main Methods:

  • Tested 10 bioactive substances, 4 light wavelengths, and 4 CO₂ regimes on Arthrospira platensis, Chlorella vulgaris, Ankistrodesmus falcatus, and Tetradesmus dimorphus.
  • Employed linear modeling and LSD post hoc tests for statistical analysis.

Main Results:

  • N-butyryl-DL-homoserine lactone, naphthaleneacetic acid, and indole-3-butyric acid significantly enhanced growth in specific species.
  • Aloe vera and coconut water also promoted microalgal growth.
  • Red light favored A. platensis and A. falcatus, while blue light benefited C. vulgaris and T. dimorphus.
  • CO₂ injection increased biomass and carbon fixation, especially in C. vulgaris and A. falcatus.
  • Combined treatments did not show additive effects, indicating complex interactions.

Conclusions:

  • Bioactive substances and controlled environmental conditions can significantly improve microalgal performance.
  • Further investigation into synergistic effects and scalability is essential for large-scale microalgal production.