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Simultaneous flue gas bioremediation and reduction of microalgal biomass production costs

Abstract

A flue gas originating from a municipal waste incinerator was used as a source of CO2 for the cultivation of the microalga Chlorella vulgaris, in order to decrease the biomass production costs and to bioremediate CO2 simultaneously. The utilization of the flue gas containing 10–13% (v/v) CO2 and 8–10% (v/v) O2 for the photobioreactor agitation and CO2 supply was proven to be convenient. The growth rate of algal cultures on the flue gas was even higher when compared with the control culture supplied by a mixture of pure CO2 and air (11% (v/v) CO2). Correspondingly, the CO2 fixation rate was also higher when using the flue gas (4.4 g CO2 l−1 24 h−1) than using the control gas (3.0 g CO2 l−1 24 h−1). The toxicological analysis of the biomass produced using untreated flue gas showed only a slight excess of mercury while all the other compounds (other heavy metals, polycyclic aromatic hydrocarbons, polychlorinated dibenzodioxins and dibenzofurans, and polychlorinated biphenyls) were below the limits required by the European Union foodstuff legislation. Fortunately, extending the flue gas treatment prior to the cultivation unit by a simple granulated activated carbon column led to an efficient absorption of gaseous mercury and to the algal biomass composition compliant with all the foodstuff legislation requirements.

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Acknowledgments

This work was supported by the project EUREKA of the Ministry of Education, Youth and Sports of the Czech Republic (No. OE221) and by the Institutional Research Concept No. AV0Z5020510. The authors gratefully acknowledge Ing. Frantisek Straka, PhD (Fuel Research Institute, Bechovice, Czech Republic) for providing the pure gas mixtures.

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Correspondence to V. Zachleder.

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Douskova, I., Doucha, J., Livansky, K. et al. Simultaneous flue gas bioremediation and reduction of microalgal biomass production costs. Appl Microbiol Biotechnol 82, 179–185 (2009). https://doi.org/10.1007/s00253-008-1811-9

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Keywords

  • Algae
  • Chlorella
  • Carbon dioxide
  • Bioremediation
  • Flue gas
  • Food and Feed supply