Croissance de la biomasse azotée du <i>Phaeodactylum tricornutum</i> (<i>Bacillariophyceae</i>) en cultures discontinues dialysante et non dialysante

Marsot, P.; Cembella, Allan; Mouhri, Khadija

doi:10.1139/m92-152

“…Hence, flux enhancement usually takes advantage of increases in recirculation flow rate, whereas inlet pressure is maintained close to the maximum permitted. Use of hollow fiber devices has been reported for culture of mammalian cells (78), in culture of the microalga Chlamydomonas reinhardtii (79), in continuous culturing of the microalga P. tricornutum in seawater (80), and in culture of the cyanobacteria Anabaena Variabilis (81). In regard to active mode, two main transfer processes are usually considered: (i) gas mixture is circulated together with culture, either injected at a certain point of the system (riser tube) (16,17,28,41,45,53,54,(82)(83)(84)(85)(86)(87)(88)(89)(90) or bubbled at the bottom of the reactor vessel (29-32, 34-36, 46, 51, 52, 55, 56, 61-63, 91, 92); or (ii) gas is inserted into the culture when it passes through a gas exchanger (44,50) (see Table 5).…”

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

Microalgal Reactors: A Review of Enclosed System Designs and Performances

Carvalho

¹

,

Meireles

²

,

Malcata

³

2006

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One major challenge to industrial microalgal culturing is to devise and develop technical apparata, cultivation procedures and algal strains susceptible of undergoing substantial increases in efficiency of use of solar energy and carbon dioxide. Despite several research efforts developed to date, there is no such thing as "the best reactor system"- defined, in an absolute fashion, as the one able to achieve maximum productivity with minimum operation costs, irrespective of the biological and chemical system at stake. In fact, choice of the most suitable system is situation-dependent, as both the species of alga available and the final purpose intended will play a role. The need of accurate control impairs use of open-system configurations, so current investigation has focused mostly on closed systems. In this review, several types of closed bioreactors described in the technical literature as able to support production of microalgae are comprehensively presented and duly discussed, using transport phenomenon and process engineering methodological approaches. The text is subdivided into subsections on: reactor design, which includes tubular reactors, flat plate reactors and fermenter-type reactors; and processing parameters, which include gaseous transfer, medium mixing and light requirements.

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“…Hence, the fluxes are preferably increased via increases in the recirculation flow rate, while the inlet pressure is maintained close to the maximum allowed. Use of hollow-fiber devices has been reported in the culture of mammalian cells (Gallagher et al, 1987), in the culture of the microalga Chlamydomonas reinhardtii (Chen and Johns, 1995), in continuous culturing of the microalga Phaeodactylum tricornutum in seawater (Marsot et al, 1992) and in the culture of the cyanobacterium Anabaena variabilis (Markov et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Transfer of Carbon Dioxide within Cultures of Microalgae: Plain Bubbling versus Hollow‐Fiber Modules

Carvalho

¹

,

Malcata

²

2001

Biotechnology Progress

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In attempts to improve the metabolic efficiency in closed photosynthetic reactors, availability of light and CO(2) are often considered as limiting factors, as they are difficult to control in a culture. The carbon source is usually provided via bubbling of CO(2)-enriched air into the culture medium; however, this procedure is not particularly effective in terms of mass transfer. Besides, it leads to considerable waste of that gas to the open atmosphere, which adds to operation costs. Increase in the interfacial area of contact available for gas exchange via use of membranes might be a useful alternative; microporous membranes, in hollow-fiber form, were tested accordingly. Two hollow-fiber modules, different in both hydrophilicity and outer surface area, were tested and duly compared, in terms of mass transfer, versus traditional plain bubbling. Overall volumetric coefficients (K(L)a) for CO(2) transfer were 1.48 x 10(-2) min(-1) for the hydrophobic membrane, 1.33 x 10(-2) min(-1) for the hydrophilic membrane, and 7.0 x 10(-3) min(-1) for plain bubbling. A model microalga, viz. Nannochloropsis sp., was cultivated using the two aforementioned membrane systems and plain bubbling. The produced data showed slight (but hardly significant) increases in biomass productivity when the hollow-fiber devices were used. However, hollow-fiber modules allow recirculation of unused CO(2), thus reducing feedstock costs. Furthermore, such indirect way of supplying CO(2) offers the additional possibility for use of lower gas pressures, as no need to counterbalance hydrostatic heads exists.

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“…Hence, flux enhancement usually takes advantage of increases in recirculation flow rate, whereas inlet pressure is maintained close to the maximum permitted. Use of hollow fiber devices has been reported for culture of mammalian cells(78), in culture of the microalga Chlamydomonas reinhardtii (79), in continuous culturing of the microalga P. tricornutum in seawater(80), and in culture of the cyanobacteria Anabaena Variabilis (81).…”

mentioning

confidence: 99%

Microalgal Reactors: A Review of Enclosed System Designs and Performances

Carvalho¹,

Meireles²,

Malcata³

2006

Biotechnol Progress

View full text Add to dashboard Cite

One major challenge to industrial microalgal culturing is to devise and develop technical apparata, cultivation procedures and algal strains susceptible of undergoing substantial increases in efficiency of use of solar energy and carbon dioxide. Despite several research efforts developed to date, there is no such thing as "the best reactor system"- defined, in an absolute fashion, as the one able to achieve maximum productivity with minimum operation costs, irrespective of the biological and chemical system at stake. In fact, choice of the most suitable system is situation-dependent, as both the species of alga available and the final purpose intended will play a role. The need of accurate control impairs use of open-system configurations, so current investigation has focused mostly on closed systems. In this review, several types of closed bioreactors described in the technical literature as able to support production of microalgae are comprehensively presented and duly discussed, using transport phenomenon and process engineering methodological approaches. The text is subdivided into subsections on: reactor design, which includes tubular reactors, flat plate reactors and fermenter-type reactors; and processing parameters, which include gaseous transfer, medium mixing and light requirements.

show abstract

Croissance de la biomasse azotée du Phaeodactylum tricornutum (Bacillariophyceae) en cultures discontinues dialysante et non dialysante

Cited by 5 publications

References 32 publications

Microalgal Reactors: A Review of Enclosed System Designs and Performances

Microalgal Reactors: A Review of Enclosed System Designs and Performances

Transfer of Carbon Dioxide within Cultures of Microalgae: Plain Bubbling versus Hollow‐Fiber Modules

Microalgal Reactors: A Review of Enclosed System Designs and Performances

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