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Coupling Carbon Capture from a Power Plant with Semi-automated Open Raceway Ponds for Microalgae Cultivation
Published on: August 14, 2020
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Coupling attached cultivation with CO2 absorption-microalgae conversion system for efficient bio-integrated carbon
Yaoqi Hou1, Zhan Hu1, Pengcheng Li1
1Tianjin Key Laboratory of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, PR China.
Bioresource Technology
|July 3, 2025
Summary
This study developed an attached cultivation photobioreactor for efficient carbon capture and algae-based bioconversion. This method significantly boosts biomass yield and carbon fixation, optimizing algae biorefineries.
Area of Science:
- Biotechnology
- Environmental Science
- Algal Biotechnology
Background:
- Traditional suspended cultivation of microalgae for carbon capture has limitations in efficiency.
- Developing integrated systems for simultaneous carbon capture and utilization (CCU) is crucial for sustainable biorefineries.
Purpose of the Study:
- To develop and evaluate an integrated photobioreactor system for simultaneous carbon capture and microalgae cultivation.
- To compare the efficiency of attached cultivation versus suspended cultivation for biomass yield and carbon fixation.
- To investigate the underlying molecular mechanisms of enhanced carbon fixation in attached cultivation.
Main Methods:
- Coupling non-immersed attached cultivation with a CO2 absorption-microalgae conversion (CAMC) system.
- Screening of optimal materials (polyester porous cotton, MCE membrane) and microalgae strain (Chlorella L166).
- Comparative analysis of biomass yield and carbon fixation between attached and suspended cultivation.
- Transcriptomic analysis to identify key genes and pathways involved in carbon fixation.
Main Results:
- Attached cultivation significantly increased biomass yield by 326.6% and carbon fixation capacity by 371.2% compared to suspended cultivation.
- Carbon flow was predominantly directed towards lipid synthesis during bioconversion.
- Transcriptomic data indicated partial activation of CO2 concentrating mechanism (CCM) pathways, including C4-dicarboxylic acid and crassulacean acid metabolism (CAM), with significant upregulation of genes like pckA, ppc, and MDH2.
Conclusions:
- The developed integrated photobioreactor system demonstrates efficient bio-integrated carbon capture and utilization.
- Attached cultivation enhances bicarbonate assimilation and direct atmospheric CO2 capture.
- This approach offers a cost-effective strategy for algae-based biorefineries, improving both carbon fixation and biomass production.
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