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Effects of carbon concentration, pH, and bubbling depth on carbon dioxide absorption ratio in microalgae medium

  • Dacong Yin
  • Zhongjie Wang
  • Xiaobin Wen
  • Yi Ding
  • Xiaoyu Hou
  • Yahong Geng
  • Yeguang LiEmail author
Research Article
  • 21 Downloads

Abstract

The microalgae-based CO2 sequestration is considered to be an effective technique with great potential to cope with carbon emission. However, most researches are only focused on microalgae; the effects of physicochemical factors, which are carbon concentration, medium pH, and bubbling depth, on absorption and utilization of supplied CO2 in culture is less known. In order to understand and improve CO2 absorption in microalgae culture, the effects of these three factors were studied with different levels and combinations. Results revealed that when medium carbon concentration increased from 4.76 to 95.24 mmol/L, CO2 absorption ratio increased by about 12%, 10%, 12%, and 11% at medium depths of 10, 20, 40, and 80 cm, with the initial pH 10.6 to 9.7 by bubbling CO2, respectively. As bubbling depth increased from 10 to 80 cm, CO2 absorption ratio increased by about 25%, 22%, and 25% at carbon concentrations of 4.76, 9.52, and 95.24 mmol/L, with the initial pH 10.6 to 9.7 by bubbling CO2, respectively. In range of 10.6–7.0, pH had no significant effect on CO2 absorption ratio (P > 0.05) when carbon concentration is below 9.52 mmol/L, while above 9.52 mmol/L, pH had significant effect on CO2 absorption ratio (P < 0.05). It was found for the first time that the effect of pH on the CO2 absorption ratio was affected by carbon concentration. In addition, equilibrium pH, at which the CO2 partial pressure in the medium equals to that in the air, of medium with different carbon concentrations was also determined. Overall, in microalgae culture for CO2 sequestration, increasing CO2 bubbling depth and keeping higher carbon concentration and higher pH can improve CO2 absorption ratio, which will optimize the biofixation of CO2 by microalgae furthermore.

Keywords

Microalgae Carbon dioxide Carbon concentration pH Bubbling depth Absorption ratio 

Notes

Acknowledgments

Special thanks to Kerstyn Bryce in Northwestern University at Chicago, USA, for critical reading and editing.

Funding information

This study was funded by the National Natural Sciences Foundation of China (nos. 31502192 and 31702367).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Dacong Yin
    • 1
    • 2
  • Zhongjie Wang
    • 1
    • 3
  • Xiaobin Wen
    • 1
    • 3
  • Yi Ding
    • 1
    • 3
  • Xiaoyu Hou
    • 1
    • 4
  • Yahong Geng
    • 1
    • 3
  • Yeguang Li
    • 1
    • 3
    Email author
  1. 1.Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical GardenChinese Academy of SciencesWuhanPeople’s Republic of China
  2. 2.Hubei Key Laboratory of Water Resources and Ecological Environment, Yangtze River Scientific Research InstituteWuhanPeople’s Republic of China
  3. 3.The Innovative Academy of Seed DesignChinese Academy of SciencesWuhanPeople’s Republic of China
  4. 4.University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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