Environmental Science and Pollution Research

, Volume 25, Issue 30, pp 30139–30150 | Cite as

CO2 bio-fixation and biofuel production in an airlift photobioreactor by an isolated strain of microalgae Coelastrum sp. SM under high CO2 concentrations

  • Shokouh Mousavi
  • Ghasem D. NajafpourEmail author
  • Maedeh Mohammadi
Research Article


Microalgae cultivation is a promising approach to remove ambient CO2 via photosynthesis process. This paper investigates the impact of high CO2 concentrations (6, 12, and 16%) on algae growth, CO2 biofixation, lipid and carbohydrate contents, and nutrient removal of newly isolated microalgae, Coelastrum sp. SM. In addition, the ability of microalgae to produce biodiesel at optimal condition was studied. The microalgae were cultivated in wastewater using an airlift photobioreactor. Under 12% CO2, the maximum biomass productivity and CO2 fixation rate were 0.267 g L−1 day−1 and 0.302 g L−1 h−1, respectively. Total Kjeldahl nitrogen (TKN), total phosphorous (TP), nitrate, and sCOD removal efficiency were 84.01, 100, 86.811, and 73.084%, respectively. Under 12% CO2 and at the same condition for cell growth, the highest lipid and carbohydrate contents were 3 7.91 and 58.45%, respectively. The composition of fatty acids methyl ester (FAME) of the microalga lipid was defined. Based on the obtained results and FAME profile, Coelastrum sp. SM was a suitable feedstock for biodiesel production and also, the organism had a great potential for CO2 biofixation, which is also more suitable than any other reported strains in other related studies.


Microalgae CO2 bio-fixation Coelastrum sp. SM Biodiesel Lipid Carbohydrate Nutrient removal 



The authors are grateful to Biotechnology Research Lab., Babol Noshirvani University of Technology, for the facilities provided to conduct present research.

Funding information

This research project was financially support by Iran National Gas Company Mazandaran province under contract no. 11226.

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 2018

Authors and Affiliations

  • Shokouh Mousavi
    • 1
  • Ghasem D. Najafpour
    • 1
    Email author
  • Maedeh Mohammadi
    • 1
  1. 1.Faculty of Chemical EngineeringBabol Noshirvani University of TechnologyBabolIran

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