Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 506021
Title Turbidostat operation of outdoor pilot-scale photobioreactors
Author(s) Vree, Jeroen H. de; Bosma, Rouke; Wieggers, Rick; Gegic, Snezana; Janssen, Marcel; Barbosa, Maria J.; Wijffels, René H.
Source Algal Research 18 (2016). - ISSN 2211-9264 - p. 198 - 208.
DOI https://doi.org/10.1016/j.algal.2016.06.006
Department(s) Bioprocess Engineering
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Areal productivity - Biomass concentration - Microalgae - Nannochloropsis sp. - Outdoor pilot-scale photobioreactors - Photosynthetic efficiency
Abstract

The effect of biomass concentration on areal productivity and photosynthetic efficiency of Nannochloropsis sp. CCAP211/78 was studied in three outdoor pilot-scale photobioreactors: an open raceway pond (OPR), a horizontal tubular (HT) photobioreactor and a vertically stacked horizontal tubular (VT) photobioreactor. The reactors were operated continuously as turbidostat at different biomass concentrations. For all systems highest areal productivities were obtained on days with a high light intensity, while the highest photosynthetic efficiencies were obtained on days with a low light intensity. Ground areal biomass concentration exceeding 51 g m-2 had a negative effect on the areal productivity and photosynthetic efficiency. No significant effect of biomass concentration on the productivity was found for the HT at ground areal biomass concentration lower than 51 g m-2. Also for the VT, no significant effect of biomass concentration was found with the exception of the highest biomass concentration of 2.0 g L-1 (68 g m-2) resulting in decreased productivity. For the open raceway pond the highest biomass concentration (0.5 g L-1 or 94 g m-2) resulted in significantly lower areal productivity, compared to the lower biomass concentration (0.25 g L 47 g m-2). Highest areal productivities were obtained for OPR and VT, most likely due to more efficient light interception. In this study we observed that night biomass loss was coupled to net growth. At lower biomass concentrations and concomitant higher growth rates the specific biomass loss rate was higher. Microalgal specific light absorption coefficient was correlated to biomass concentration; higher biomass concentrations resulted in higher specific absorption coefficients, resulting in a steeper light gradient in the microalgal cultures.

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