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A two-stage solar photobioreactor for cultivation of microalgae based on solar concentrators

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Abstract

A novel two-stage experimental photobioreactor (PBR) with a total volume of 450 L and based uniquely on solar concentrators—linear Fresnel lenses—has been constructed and tested. Daily courses of irradiance, and also its distribution inside cultivation tubes, were studied in two unit types. The supra-high irradiance units in the ‘roof’ achieved a maximum summer value above 6 mmol photon m−2 s−1, while irradiance in the vertical-facade units was lower than ‘ambient’. In model cultivations, cultures of the cyanobacterium Arthrospira platensis were cultivated at much higher solar irradiances than those usually recorded outdoors in summer, indicating that this organism is resilient to high-irradiance (photoinhibition). Starting from a biomass density of 0.5 g L−1 at optimum temperature, the cultures grew exponentially. A two-stage cultivation process of the green microalga Haematococcus pluvialis was investigated with respect to correlations between photochemical activities and astaxanthin production. The culture was first grown in low-irradiance units, and then exposed to supra-high irradiance when the rate of astaxanthin production was 30–50% higher than in the culture exposed to ‘ambient’ irradiance. Within 4 days, the astaxanthin content reached 3% of dry weight, whereas under ambient irradiance the astaxanthin content was 25% lower.

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Abbreviations

Fo, Fv, Fm :

Minimum, variable and maximum fluorescence levels of dark-adapted cultures

Fv/Fm, \({{F_v^\prime } \mathord{\left/ {\vphantom {{F_v^\prime } {F_m^\prime }}} \right. \kern-\nulldelimiterspace} {F_m^\prime }}\) :

maximum photochemical yield of PSII measured in dark-adapted culture or light-adapted culture, respectively

NPQ:

Non-photochemical quenching

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Acknowledgements

The authors thank Mr. Petr Kohout, Mr. Jan Červený and Mr. Zdeněk Česák for technical assistance and Dr. Steve Ridgill for language correction. This research was supported by the Ministry of Education, project MSM6007665808 “Physical Biology-New Approach to Biological Research” and by EC project “Centre of Biological Technologies Nové Hrady” - PHARE Cross-border Cooperation Programme, No. CZ01.11.01.01. Partial funding was also provided by projects 522/06/1090 and 522/05/P276 of the Czech Science Foundation, and by project IAA608170601 of the Grant Agency of the Academy of Sciences. The visit of G.T. was supported within the framework of the Bilateral Scientific Agreement between the National Research Council of Italy and the Academy of Sciences of the Czech Republic.

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Masojídek, J., Sergejevová, M., Rottnerová, K. et al. A two-stage solar photobioreactor for cultivation of microalgae based on solar concentrators. J Appl Phycol 21, 55–63 (2009). https://doi.org/10.1007/s10811-008-9324-6

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  • DOI: https://doi.org/10.1007/s10811-008-9324-6

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