Distinctive correlations between cell concentration and cell size to microalgae biomass under increasing carbon...

Area of Science:

• Biotechnology
• Environmental Science
• Algal Biology

Background:

• Microalgae are increasingly recognized for their potential in carbon capture and storage (CCS) due to efficient photosynthesis and CO2 fixation.
• Current understanding of microalgae growth parameters under varying CO2 conditions is limited, hindering the optimization and scale-up of CCS technologies.
• Key relationships between microalgae growth metrics (biomass, cell concentration, cell size) and CO2 exposure are not well-established.

Purpose of the Study:

• To investigate the parametric relationships governing microalgae growth under elevated CO2 concentrations.
• To establish correlations between cell concentration, cell size, and biomass fluctuations in response to varying CO2 levels.
• To provide insights for improving the design and scale-up of microalgae-based CCS systems.

Main Methods:

• Cultivation of three microalgae species: Chlorella, Nostoc, and Chlamydomonas.
• Exposure to a range of CO2 concentrations, from 0% to 20% (v/v).
• Monitoring and analysis of microalgae biomass, cell concentrations, and cell sizes.

Main Results:

• Chlorella and Chlamydomonas cell concentrations were found to significantly increase biomass under elevated CO2.
• Microalgae cell sizes, specifically in Chlorella and Nostoc, showed enhancement at the highest CO2 concentration (20% v/v).
• Established key correlations between microalgae growth parameters and CO2 influences.

Conclusions:

• The study provides novel insights into microalgae growth responses to increasing CO2 levels.
• Findings contribute to the engineering design of more efficient carbon capture and storage (CCS) schemes.
• Enhanced understanding opens new possibilities for biochemical production using microalgae.