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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Enhancing CO2 utilization by a physical absorption-based technique in microalgae culture.

Zhong-Liang Sun1, Meng-Ru Xin1, Ping Li1

  • 1College of Life Sciences, Yantai University, Yantai, 264005, People's Republic of China.

Bioprocess and Biosystems Engineering
|April 17, 2021
PubMed
Summary

Adding physical absorption enhancers significantly boosts microalgae growth and carbon dioxide (CO2) utilization. This approach improves biomass productivity and reduces CO2 consumption in algal cultivation.

Keywords:
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Area of Science:

  • Biotechnology
  • Algal Biology
  • Environmental Science

Background:

  • Carbon dioxide (CO2) is crucial for microalgae growth in autotrophic cultures.
  • Current CO2 utilization efficiency in microalgae cultivation is often low, increasing production costs.
  • Efficient carbon sequestration by microalgae is vital for sustainable biomass production.

Purpose of the Study:

  • To investigate the effectiveness of physical absorption enhancers in improving microalgae's biological carbon sequestration.
  • To assess the impact of these enhancers on total inorganic carbon concentration and biomass productivity.
  • To determine the optimal enhancers for enhancing CO2 utilization efficiency in different cultivation systems.

Main Methods:

  • Six different physical absorption enhancers were tested.
  • The total inorganic carbon concentration in the medium was measured after enhancer addition.
  • Biomass productivity of Scenedesmus dimorphus was evaluated in flask cultures.
  • CO2 consumption was monitored in an air-lift photobioreactor with pH-feedback control.

Main Results:

  • A small amount of CO2 absorption enhancer significantly increased total inorganic carbon concentration.
  • Propylene carbonate maximized biomass productivity of Scenedesmus dimorphus by 63% in flask cultures.
  • Polyethylene glycol dimethyl ether maximally reduced CO2 consumption by 71% in photobioreactor cultures.

Conclusions:

  • Physical absorption enhancers show promise for improving CO2 utilization efficiency in microalgae cultivation.
  • This approach can help overcome challenges associated with low carbon efficiency and high carbon source costs.
  • Incorporating enhancers offers a viable strategy for cost-effective algal biomass production.