Growth of algal biomass in laboratory and in large-scale algal photobioreactors in the temperate climate of western Germany

Schreiber, Christina; Behrendt, Dominik; Huber, Gregor; Pfaff, Christian; Widzgowski, Janka; Ackermann, Bärbel; Müller, Andréas; Zachleder, Vilém; Moudříková, Šárka; Mojzeš, Peter; Schurr, Ulrich; Grobbelaar, Johan U.; Nedbal, Ladislav

doi:10.1016/j.biortech.2017.03.028

Cited by 47 publications

(27 citation statements)

References 21 publications

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“…The rapidly growing young cells generally lead to a lower content of storage lipids and more proteins than cells cultured at lower specific growth rates [51]. The variance observed in the total lipids quantification of microalgae biomass, when comparing different studies and culture conditions, can be explained by the large variability of environmental factors that affect the growth rate and productivities [52]. Also, lipid content is strongly influenced by environmental effects, such as nitrogen limitations, temperature and irradiance in P. tricornutum cultures [47].…”

Section: Methanol/chloroformmentioning

confidence: 99%

Potential of Phaeodactylum tricornutum for Biodiesel Production under Natural Conditions in Chile

et al. 2017

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Diatoms are very diverse and highly productive organisms, found in a wide variety of environments. This study aims to analyze the growth and lipid composition of Phaeodactylum tricornutum, cultured in an outdoor pilot-scale bubble column photobioreactor under natural conditions in Chile for biodiesel production. Results showed that P. tricornutum cultures reached their highest biomass concentration (0.96 ± 0.04 kg m −3) after 14 days of culturing, at the stationary phase, with a volumetric productivity of 0.13 kg m −3 d −1. Biomass samples showed a total lipid content of 9.08 ± 0.38 wt %. The fatty acid methyl ester analysis revealed a composition of 24.39% C16-C18 fatty acids, 42.34% saturated fatty acids, 21.91% monounsaturated fatty acids and 31.41% polyunsaturated fatty acids. These findings suggest that P. tricornutum oil can be used as an alternative raw material for the production of biodiesel capable of meeting international quality standards.

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Section: Methanol/chloroformmentioning

confidence: 99%

Potential of Phaeodactylum tricornutum for Biodiesel Production under Natural Conditions in Chile

et al. 2017

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“…Here, the depth into the PBR is the only spatial parameter along which the light intensity was calculated, since the incident light was assumed to be uniformly distributed across the PBR surface, boundary effects at the side walls of the PBR were neglected, and algal concentration differences along the width and height of the PBR were averaged for simplicity. Figure 3 a was calculated with the same combination of blue and red light as often used in experiments performed on the PBR simulated here, i.e., 50% red and 50% blue [ 20 , 21 ]. Figure 3 b shows the distribution of light when irradiated with a solar spectrum in the PAR region (400–700 nm).…”

Section: Resultsmentioning

confidence: 99%

Single-cell computational analysis of light harvesting in a flat-panel photo-bioreactor

Loomba

Huber

Lieres

2018

Biotechnol Biofuels

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BackgroundFlat-panel photo-bioreactors (PBRs) are customarily applied for investigating growth of microalgae. Optimal design and operation of such reactors is still a challenge due to complex non-linear combinations of various impact factors, particularly hydrodynamics, light irradiation, and cell metabolism. A detailed analysis of single-cell light reception can lead to novel insights into the complex interactions of light exposure and algae movement in the reactor.ResultsThe combined impacts of hydrodynamics and light irradiation on algae cultivation in a flat-panel PBR were studied by tracing the light exposure of individual cells over time. Hydrodynamics and turbulent mixing in this air-sparged bioreactor were simulated using the Eulerian approach for the liquid phase and a slip model for the gas phase velocity profiles. The liquid velocity was then used for tracing single cells and their light exposure, using light intensity profiles obtained from solving the radiative transfer equation at different wavelengths. The residence times of algae cells in defined dark and light zones of the PBR were statistically analyzed for different algal concentrations and sparging rates. The results indicate poor mixing caused by the reactor design which can be only partially improved by increased sparging rates.ConclusionsThe results provide important information for optimizing algal biomass productivity by improving bioreactor design and operation and can further be utilized for an in-depth analysis of algal growth by using advanced models of cell metabolism.

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“…The suggested gas-permeating membrane system can be applied to various types of algal photobioreactors. A bag reactor supported by iron frames (Sierra et al, 2008), hanged columntype bag reactors (Abomohra et al, 2014), and multi-folded reactors (Schreiber et al, 2017) are largely operated examples of bag reactors. A gas-permeable membrane can be added to such reactors for energy-efficient dissolved oxygen removal without interfering the productivity, as long as the membrane does not shade the algal culture.…”

Section: Suggested Gas-permeating System For Algal Photobioreactormentioning

confidence: 99%

Effect of Membrane Hydrophobicity and Thickness on Energy-Efficient Dissolved Oxygen Removal From Algal Culture

Kishi

Nagatsuka

Toda

2020

Front. Bioeng. Biotechnol.

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Removal of dissolved oxygen from algal photobioreactors is essential for high productivity in mass cultivation. Gas-permeating photobioreactor that uses hydrophobic membranes to permeate dissolved oxygen (pervaporation) from its body itself is an energy-efficient option for oxygen removal. This study comparably evaluated the characteristics of various commercial membranes and determined the criteria for the selection of suitable ones for the gas-permeating photobioreactors. It was found that oxygen permeability is limited not by that in the membrane but in the liquid boundary layer. Membrane thickness had a negative effect on membrane oxygen permeability, but the effect was as minor as less than 3% compared with the liquid boundary layer. Due to this characteristic, the lamination of non-woven fabric with the microporous film did not significantly decrease the overall oxygen transfer coefficient. The permeability in the liquid boundary layer had a significantly positive relationship with the hydrophobicity. The highest overall oxygen transfer coefficients in the water-to-air and water-to-water oxygen removal tests were 2.1 ± 0.03 × 10 −5 and 1.39 ± 0.09 × 10 −5 m s −1 , respectively. These values were considered effective in the dissolved oxygen removal from high-density algal culture to prevent oxygen inhibition. Furthermore, hydrophobicity was found to have a significant relationship also with water entry pressure, which needs to be high to avoid culture liquid leakage. Therefore, these results suggested that a microporous membrane with strong hydrophobicity laminated with non-woven fabric would be suitable characteristics for gas-permeating photobioreactor.

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Growth of algal biomass in laboratory and in large-scale algal photobioreactors in the temperate climate of western Germany

Cited by 47 publications

References 21 publications

Potential of Phaeodactylum tricornutum for Biodiesel Production under Natural Conditions in Chile

Potential of Phaeodactylum tricornutum for Biodiesel Production under Natural Conditions in Chile

Single-cell computational analysis of light harvesting in a flat-panel photo-bioreactor

Effect of Membrane Hydrophobicity and Thickness on Energy-Efficient Dissolved Oxygen Removal From Algal Culture

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