Bioprocess and Biosystems Engineering

, Volume 36, Issue 3, pp 345–355 | Cite as

Irradiance optimization of outdoor microalgal cultures using solar tracked photobioreactors

  • Stefan Hindersin
  • Marco Leupold
  • Martin Kerner
  • Dieter Hanelt
Original Paper

Abstract

Photosynthetic activity and temperature regulation of microalgal cultures (Chlorella vulgaris and Scenedesmus obliquus) under different irradiances controlled by a solar tracker and different cell densities were studied in outdoor flat panel photobioreactors. An automated process control unit regulated light and temperature as well as pH value and nutrient concentration in the culture medium. CO2 was supplied using flue gas from an attached combined block heat and power station. Photosynthetic activity was determined by pulse amplitude modulation fluorometry. Compared to the horizontal irradiance of 55 mol photons m−2 d−1 on a clear day, the solar tracked photobioreactors enabled a decrease and increase in the overall light absorption from 19 mol photons m−2 d−1 (by rotation out of direct irradiance) to 79 mol photons m−2 d−1 (following the position of the sun). At biomass concentrations below 1.1 g cell dry weight (CDW) L−1, photoinhibition of about 35 % occurred at irradiances of ≥1,000 μmol photons m−2 s−1 photosynthetic active radiation (PAR). Using solar tracked photobioreactors, photoinhibition can be reduced and at optimum biomass concentration (≥2.3 g CDW L−1), the culture was irradiated up to 2,000 μmol photons m−2 s−1 to overcome light limitation with biomass yields of 0.7 g CDW mol photons−1 and high photosynthetic activities indicated by an effective quantum yield of 0.68 and a maximum quantum yield of 0.80 (Fv/Fm). Overheating due to high irradiance was avoided by turning the PBR out of the sun or using a cooling system, which maintained the temperature close to the species-specific temperature optima.

Keywords

Solar tracked photobioreactors Photoinhibition Outdoor cultivation Microalgae Temperature and irradiance control Flue gas 

Abbreviations

CDW

Biomass concentration, cell dry weight [g L−1]

ΔF/Fm

Effective quantum yield of photosynthesis

Fv/Fm

Maximum quantum yield of photosystem (PS) II

OLP

Optical light path [mm]

PAR

Photosynthetic active radiation (μmol photons m−2 s−1, 400–700 nm); horizontal PAR (PAR absorbed by a horizontal plane)

PBR

Photobioreactor

PS II

Photosystem II

Notes

Acknowledgments

Special thanks are dedicated to Ines Krohn, Institute of Microbiology, University of Hamburg for the genetic identification of Scenedesmus obliquus. Many thank to Dirk Warnecke for critical reading and comments of the manuscript. We also like to thank the staff of E.ON Hanse for their support to this study. The study was funded by the Federal Ministry of Economy and Technology.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Stefan Hindersin
    • 1
    • 2
  • Marco Leupold
    • 1
    • 2
  • Martin Kerner
    • 2
  • Dieter Hanelt
    • 1
  1. 1.Department of Cell Biology and PhycologyUniversity of HamburgHamburgGermany
  2. 2.Strategic Science Consult SSC LtdHamburgGermany

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