Outdoor cultivation ofArthrospira platensis during autumn and winter in temperate climates

Zittelli, Graziella Chini; Tomasello, Vincenzina; Pinzani, Edoardo; Tredici, Mario R.

doi:10.1007/bf02178572

Cited by 34 publications

(6 citation statements)

References 6 publications

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“…10C). This same correlation was also reported in outdoor cultures of other microalgae (Qiang et al, 1998;Tredici et al, 1991;Zhang et al, 1999;Zittelli et al, 1996). Zhang also showed that if temperature was not controlled, like here, that this correlation was less pronounced due to the interaction effect between temperature and light intensity.…”

Section: Parameters Influence On Volumetric Productivitysupporting

confidence: 89%

Prediction of volumetric productivity of an outdoor photobioreactor

Bosma

Zessen

Reith

et al. 2007

Biotech & Bioengineering

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Volumetric productivity of Monodus subterraneus cultivated in an outdoor pilot-plant bubble column was predicted with a mathematical model. Two border cases to model the photobioreactor were chosen. Firstly, a model with no light integration in which it is assumed that microalgae can adapt immediately to local light conditions. Secondly, full light integration implicating that microalga can convert all absorbed light with a photosynthetic yield based on average light intensity. Because temperature and light conditions in our photobioreactor changed during the day, photosynthetic yields at any combination of temperature and light intensity were needed. These were determined in repeated-batch lab-scale experiments with an experimental design. The model was evaluated in an outdoor bubble column at different natural light conditions and different temperatures. Volumetric productivities in the bubble column were predicted and compared with experimental volumetric productivities. The light integration model over-estimated productivity, while the model in which we assumed no light integration under-estimated productivity. Light integration occurred partly (47%) during the period investigated. The average observed biomass yield on light was 0.60 g.mol(-1). The model of partly light integration predicted an average biomass yield on light of 0.57 g.mol(-1) and predicted that productivity could have been increased by 19% if culture temperature would have been maintained at 24 degrees C.

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Section: Parameters Influence On Volumetric Productivitysupporting

confidence: 89%

Prediction of volumetric productivity of an outdoor photobioreactor

Bosma

Zessen

Reith

et al. 2007

Biotech & Bioengineering

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show abstract

“…Moreover, due to the existence of buffer bicarbonates, carbon availability is a function of total inorganic carbon and pH of the culture (Pruder and Bolton, 1979). The most suitable form of supplying CO 2 is by on-demand injection of CO 2 , either mixed in the airflow (Chini Zitelli et al, 1996) or directly in the culture broth (Molina Grima et al, 1994) or by means of a mixing ab-sorber (Livansky et al, 1973). To be available to culture, carbon dioxide must move from a gas phase to a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide uptake efficiency by outdoor microalgal cultures in tubular airlift photobioreactors

Sobczuk

Camacho

Rubio

et al. 2000

Biotechnol. Bioeng.

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The influence of solar irradiance and carbon dioxide molar fraction of injected CO2–air mixtures on the behavior of outdoor continuous cultures of the microalga Phaeodactylum tricornutum in tubular airlift photobioreactors was analyzed. Instantaneous solar irradiance, pH, dissolved oxygen, temperature, biomass concentration, and the mass flow rates of both the inlet and outlet oxygen and carbon with both the liquid and gas phases were measured. In addition, elemental analysis of the biomass and the cell‐free culture medium was performed. The oxygen production rate and carbon dioxide consumption rate increased hyperbolically with the incident solar irradiance on the reactor surface. Carbon losses showed a negative correlation with the daily variation of the carbon dioxide consumption rate. The maximum CO2 uptake efficiency was 63% of the CO2 supplied when the CO2 concentration in the gas supplied was 60% v/v. Carbon losses were >100% during the night, due to CO2 production by respiration, and hyperbolically decreased to values of 10% to 20% in the midday hours. An increase in the carbon fixed in the biomass with the solar cycle was observed. A slight daily decrease of carbon content of the cell‐free culture medium indicated the existence of carbon accumulation in the culture. A decrease in CO2 molar fraction in the injected gas had a double benefit: first, the biomass productivity of the system was enhanced from 2.05 to 2.47 g L−1 day−1 by reduction of CO2 inhibition and/or pH gradients; and second, the carbon losses during the daylight period were reduced by 60%. The fluid dynamics in the reactor also influenced the carbon losses: the higher the liquid flow rate the higher the carbon losses. By using a previous mass transfer model the experimental results were simulated and the usefulness of this method in the evaluation and scale‐up of tubular photobioreactors was established. © 2000 John Wiley & Sons, Inc. Biotechnol Bioeng 67: 465–475, 2000.

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“…The aims of this mixing system were to mix the culture and to clean up the wall of the bioreactor. In 1996, another single tube reactor (50mm external diameter; 1.5mm wall thickness and 6.2m long) was tested [94]. The tube was placed on a platform facing south and tilted to form a horizontal angle of 10°.…”

Section: Single Tube Photobioreactorsmentioning

confidence: 99%

Closed Photobioreactor Assessments to Grow, Intensively, Light Dependent Microorganisms: A Twenty-Year Italian Outdoor Investigation

Carlozzi

2008

TOBIOTJ

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Twenty years of Italian outdoor investigations on closed photobioreactors are discussed in this review. Many photobioreactor designs have been projected; some have been built, tested and patented. The Italian research approach from tubular (single tube and traditional loop) to flat and column and again to tubular photobioreactors (coil and loops) has improved microalgal yield. It increased from 25.0 gm -2 d -1 in 1986 (using a traditional loop set down on the ground) to 47.7 gm -2 d -1 in 2003, when results of a new tubular undulating row photobioreactor (TURP) were reported. This very high TURP productivity was attributed to a light dilution growth-strategy using Arthrospira platensis; the photic ratio (R f ) ranged from 3 to 6.

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Outdoor cultivation ofArthrospira platensis during autumn and winter in temperate climates

Cited by 34 publications

References 6 publications

Prediction of volumetric productivity of an outdoor photobioreactor

Prediction of volumetric productivity of an outdoor photobioreactor

Carbon dioxide uptake efficiency by outdoor microalgal cultures in tubular airlift photobioreactors

Closed Photobioreactor Assessments to Grow, Intensively, Light Dependent Microorganisms: A Twenty-Year Italian Outdoor Investigation

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