Comparison of two different pneumatically mixed column photobioreactors for the cultivation of Artrospira platensis (Spirulina platensis)

Öncel, Suphi Ş.; Sukan, Fazilet Vardar

doi:10.1016/j.biortech.2007.09.068

Cited by 61 publications

(26 citation statements)

References 20 publications

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“…It can be noticed that chlorophyll a content was highest for the lowest intensity. This is in accordance with the literature for white light 30,33,37,38 and confirms that cyanobacteria adapt their chlorophyll concentration to light in order to optimize light capture. Danesi et al 33 reported that Spirulina increases its chlorophyll a concentration with low light intensity.…”

Section: Results and Discussion Influence Of Light Wavelengthsupporting

confidence: 91%

Influence of light quality and intensity in the cultivation of Spirulina platensis from Toliara (Madagascar) in a closed system

Ravelonandro¹,

Ratianarivo²,

Joannis-Cassan³

et al. 2008

J of Chemical Tech & Biotech

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International audienceBACKROUND: Spirulina platensis (Toliara, Madagascar) provides a food supplement which can fight against malnutrition and food insufficiency in Madagascar. In this country, the current production from three open basins is not sufficient to cover needs, and presents drawbacks such as low productivity and possible contamination. Thus cultivation of S. platensis in a closed photobioreactor opens the possibility of extending this microalga production. In this study, the influence of colour and intensity of the light on S. platensis growth and protein content was investigated in a bubble column.RESULTS: Growth kinetics were obtained for four colours (green, white, red and blue) and four intensities (400, 800, 1000 and 1200 lux) of light. The influence of light colour on Spirulina growth was discussed. The highest productivity (183.6mg L(-1) d(-1)) and concentration (2643mg L(-1)) were obtained for green light at 1200 lux. The protein content was 58%.CONCLUSION: Using green light allows improvement of S. platensis growth. Performance obtained with the closed system was higher than that reported in the literature

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Section: Results and Discussion Influence Of Light Wavelengthsupporting

confidence: 91%

Influence of light quality and intensity in the cultivation of Spirulina platensis from Toliara (Madagascar) in a closed system

Ravelonandro¹,

Ratianarivo²,

Joannis-Cassan³

et al. 2008

J of Chemical Tech & Biotech

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“…The downcomer is usually arranged as a section of the cross-section (split cylinder) or in a coaxial inner cylinder (draft tube). In a comparison in small scale [39] reasonably good axial gas transfers have been found. As this part of the reactor is dark, the cells flow through riser and downcomer regularly, inductingan additional light/ dark cycle in the range of 1-100 seconds as investigated from [40,41].…”

Section: Commonly Employed Reactor Designsmentioning

confidence: 61%

Design principles of photo‐bioreactors for cultivation of microalgae

Posten

2009

Engineering in Life Sciences

682

361

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The present hype in microalgae biotechnology has shown that the topic of photobioreactors has to be revisited with respect to availability in really large scale measured in hectars footprint area, minimization of cost, auxiliary energy demand as well as maintenance and life span. This review gives an overview about present designs and the basic limiting factors which include light distribution to avoid saturation kinetics, mixing along the light gradient to make use of light/ dark cycles, aeration and mass transfer along the vertical or horizontal main axis for carbon dioxide supply and oxygen removal and last but not least the energy demand necessary to fulfil these tasks. To make comparison of the performance of different designs easier, a commented list of performance parameters is given. Based on these critical points recent developments in the areas of membranes for gas transfer and optical structures for light transfer are discussed. The fundamental starting point for the optimization of photo-bioprocesses is a detailed understanding of the interaction between the bioreactor in terms of mass and light transfer as well as the microalgae physiology in terms of light and carbon uptake kinetics and dynamics.

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“…The advantages of this type of PBR are: no moving parts, simplicity of construction, low power consumption, good mass and heat transfer characteristics, good solid suspensions, homogeneous shear stress distribution, rapid mixing, and, one of the most important, control over liquid circulation (Roy et al, 2006;Chisti, 1998). Aeration rates and bubble diameters are controlled via air spargers which provide optimal mixing and gas transfer in the reactor (Oncel and Sukan, 2008). Some investigations (Oncel and Sukan, 2008) have favored the selection of an airlift PBR respect to bubble column because, under the same physical conditions, the presence of the draft tube in the airlift results in more effective mixing and the bubbles rising inside the draft tube provide a less turbid zone in the annulus region, thus enabling a better exposure to the light.…”

Section: Introductionmentioning

confidence: 99%

“…Aeration rates and bubble diameters are controlled via air spargers which provide optimal mixing and gas transfer in the reactor (Oncel and Sukan, 2008). Some investigations (Oncel and Sukan, 2008) have favored the selection of an airlift PBR respect to bubble column because, under the same physical conditions, the presence of the draft tube in the airlift results in more effective mixing and the bubbles rising inside the draft tube provide a less turbid zone in the annulus region, thus enabling a better exposure to the light. Also in the research work of , the results showed that the effects of a better mixing and light exposition greatly influenced the performance of the biological system, culture of Nannochloropsis sp, for obtaining a higher cell concentration in an airlift PBR, hence yielding a better cell productivity than for the bubble column PBR.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of multiphase flow in an airlift column photobioreactor

Freites¹

2014

Global NEST Journal

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A Computational Fluid Dynamics (CFD) simulation using CFX, ANSYS 11.0, has been carried out using a multiphase flow model with an Eulerian-Eulerian approach for an airlift column photobioreactors (PBR). Transient simulations were performed for three inlet air flow, 2, 3 and 5 l min . The contours for gas holdup, air and water velocity showed that the presence of gas phase (air bubbles) is lower in the downcomer but larger in the riser, which leads to require a vigorous mixing in the riser that will be sufficient for a continuous flow. For air, velocity vectors show that they are smaller in the downcomer than in the riser. Nevertheless, water velocity vectors are organized, pointing down in the downcomer and up in the riser. Water shear stress rate contours analysis showed that, shear stress rate regions are considerably larger in the riser, but lower in the downcomer. Due to fewer restrictions to the liquid phase in the riser, a large amount of energy is dissipated by gas liquid interactions. In the downcomer region, gas phase is almost inexistent, and so are the bubble collisions. Finally, the kinetic energy is larger at the top region of the riser, meanwhile is lower at the downcomer. Similar results are observed for energy dissipation rate.

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Comparison of two different pneumatically mixed column photobioreactors for the cultivation of Artrospira platensis (Spirulina platensis)

Cited by 61 publications

References 20 publications

Influence of light quality and intensity in the cultivation of Spirulina platensis from Toliara (Madagascar) in a closed system

Influence of light quality and intensity in the cultivation of Spirulina platensis from Toliara (Madagascar) in a closed system

Design principles of photo‐bioreactors for cultivation of microalgae

CFD simulation of multiphase flow in an airlift column photobioreactor

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