Mass Production of Microalgae

Pires, José C.M.

doi:10.1016/b978-0-12-800776-1.00005-4

Cited by 10 publications

(5 citation statements)

References 78 publications

(68 reference statements)

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“…Note, these higher growth rates were observed only in the declining growth phase (or early stationary phase; from the end of the exponential phase when the growth rate starts to slow down to the start of the stationary phase when the growth rate approaches zero, i.e., from day 3 to day 7; Fig. S1b; Pires 2015). The growth rates in the exponential phase were not different among treatments (Fig.…”

Section: Resultsmentioning

confidence: 96%

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Zhou

Liu

et al. 2021

Limnology & Oceanography

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Recent studies indicate that aluminum (Al) could play an important role in the ocean carbon cycle by increasing phytoplankton carbon fixation and reducing organic carbon decomposition. However, how Al may influence the decomposition of organic carbon has not yet been explicitly examined. Here we report the effects of Al on carbon fixation by marine diatoms and their subsequent decomposition. By using radiocarbon as a tracer, the carbon fixation and decomposition of three model marine diatoms were examined in Aquil* media at different concentrations (0, 40, 200, and 2000 nM) of dissolved Al. Addition of Al enhanced net carbon fixation by the diatoms in the declining growth phase (by 9%-29% for Thalassiosira pseudonana, 15%-20% for T. oceanica, 15%-23% for T. weissflogii). Under axenic conditions the decomposition rates (d À1 ) of the diatomproduced particulate organic carbon (POC) significantly decreased (by 21%-57% for T. pseudonana, 0%-41% for T. oceanica, 29%-58% for T. weissflogii) in the Al-enriched treatments. In the presence of bacteria, the decomposition rates of T. weissflogii-produced POC were still 37%-38% lower in Al-enriched treatments compared to the control. Significant increases in cell size, cellular carbon content (pmol C/cell) and cellular carbon density (pmol C/μm 3 ) of T. weissflogii were also observed in the Al-enriched treatments compared to the control. The Al-related increase in net carbon fixation and cell size, and the decrease in POC decomposition rate may facilitate carbon export to ocean depths. The study provides new evidence for the iron-aluminum hypothesis, which suggests that Al could increase phytoplankton uptake of atmospheric CO 2 and influence climate change.

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Section: Resultsmentioning

confidence: 96%

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Zhou

Liu

et al. 2021

Limnology & Oceanography

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“…For PBRs operated in continuous mode, steady-state conditions are achieved when dX dt ¼ 0. This condition is satisfied when 〈μ〉 ¼ D (Pires, 2015).…”

Section: Growth Kinetics and Productivitymentioning

confidence: 97%

“…The time rate of change of the microorganism mass concentration X(t) in continuous cultures satisfies the mass balance equation (Pires, 2015)…”

Section: Growth Kinetics and Productivitymentioning

confidence: 99%

Simple method for measuring the spectral absorption cross-section of microalgae

Kandilian

Souliès

Pruvost

et al. 2016

Chemical Engineering Science

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International audienceThe spectral absorption cross-section of microalgae is an essential parameter in modeling the microalgae metabolism and growth kinetics as well as in estimating the productivity and efficiency of photo-bioreactors. This paper presents a simple experimental procedure for retrieving the average spectral absorption cross-section of concentrated microalgal suspensions. The method combines experimental measurements of the normal–hemispherical transmittance and reflectance of the suspensions in conventional cuvettes with an inverse method and analytical expressions obtained from the modified two-flux approximation accounting for absorption and multiple scattering. The method was validated with direct measurements of the scattering phase function and of the absorption and scattering cross-sections of freshwater microalgae Chlorella vulgaris. It was able to retrieve the absorption cross-section with acceptable accuracy. The latter was then used to estimate successfully the fluence rate using a simplified light transfer model, the local rate of photon absorption, and the biomass productivity in flat plate PBRs

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“…to closed photobioreactors (flat panel, tubular, vertical, horizontal, inclined, etc.) [105,106]. The idea for all these systems is to get as much as possible light to achieve the best productivity.…”

Section: Perspectives On Issues Affecting the Future Of Eps Microamentioning

confidence: 99%

What Is in Store for EPS Microalgae in the Next Decade?

et al. 2019

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Microalgae and their metabolites have been an El Dorado since the turn of the 21st century. Many scientific works and industrial exploitations have thus been set up. These developments have often highlighted the need to intensify the processes for biomass production in photo-autotrophy and exploit all the microalgae value including ExoPolySaccharides (EPS). Indeed, the bottlenecks limiting the development of low value products from microalgae are not only linked to biology but also to biological engineering problems including harvesting, recycling of culture media, photoproduction, and biorefinery. Even respecting the so-called “Biorefinery Concept”, few applications had a chance to emerge and survive on the market. Thus, exploiting EPS from microalgae for industrial applications in some low-value markets such as food is probably not a mature proposition considering the competitiveness of polysaccharides from terrestrial plants, macroalgae, and bacteria. However, it does not imply drawing a line on their uses but rather “thinking them” differently. This review provides insights into microalgae, EPS, and their exploitation. Perspectives on issues affecting the future of EPS microalgae are also addressed with a critical point of view.

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Mass Production of Microalgae

Cited by 10 publications

References 78 publications

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Simple method for measuring the spectral absorption cross-section of microalgae

What Is in Store for EPS Microalgae in the Next Decade?

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