Direct approach for bioprocess optimization in a continuous flat-bed photobioreactor system

Kwon, Jong-Hee; Rögner, Matthias; Rexroth, Sascha

doi:10.1016/j.jbiotec.2012.06.031

Cited by 28 publications

(26 citation statements)

References 33 publications

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“…Despite the importance of the light issue, in order to obtain a high biomass/product yield and a stable product quality, a permanent control of many other independent and mutably dependent factors is required (Kwon et al, 2012).…”

Section: Specificities Of Continuous Phototrophic Culturesmentioning

confidence: 99%

“…Other characteristics such as: reduction of space requirement due to smaller equipment; decrease of labor costs due to a full automation of the production process; lower investment and operational costs; decrease of "unprofitable" periods of bioreactor operation due to a reduction in the downtime for cleaning and sterilization; suppression of water loss by evaporation; and the opportunity to decrease the viscosity of the broth whenever necessary, make continuous cultivation a very appealing strategy for commercial or lab scale cultivation of microalgae and cyanobacteria (Borowitzka, 1999;Brethauer and Wyman, 2010;Kwon et al, 2012;Marchetti et al, 2012;Paulová et al, 2013;Sharma and Stal, 2014;Zhu and Jiang, 2008).…”

Section: Advantagesmentioning

confidence: 99%

“…The commercial exploitation of these photosynthetic microorganisms raises the need for reliable, efficient and costefficient processes with a constant product quality (Kwon et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Fernandes

Mota

Teixeira

et al. 2015

Biotechnology Advances

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The possibility of using photosynthetic microorganisms, such as cyanobacteria and microalgae, for converting light and carbon dioxide into valuable biochemical products has raised the need for new cost-efficient processes ensuring a constant product quality. Food, feed, biofuels, cosmetics and pharmaceutics are among the sectors that can profit from the application of photosynthetic microorganisms. Biomass growth in a photobioreactor is a complex process influenced by multiple parameters, such as photosynthetic light capture and attenuation, nutrient uptake, photobioreactor hydrodynamics and gas-liquid mass transfer. In order to optimize productivity while keeping a standard product quality, a permanent control of the main cultivation parameters is necessary, where the continuous cultivation has shown to be the best option. However it is of utmost importance to recognize the singularity of continuous cultivation of cyanobacteria and microalgae due to their dependence on light availability and intensity. In this sense, this review provides comprehensive information on recent breakthroughs and possible future trends regarding technological and process improvements in continuous cultivation systems of microalgae and cyanobacteria, that will directly affect cost-effectiveness and product quality standardization. An overview of the various applications, techniques and equipment (with special emphasis on photobioreactors) in continuous cultivation of microalgae and cyanobacteria are presented. Additionally, mathematical modeling, feasibility, economics as well as the applicability of continuous cultivation into large-scale operation, are discussed.

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Section: Specificities Of Continuous Phototrophic Culturesmentioning

confidence: 99%

Section: Advantagesmentioning

confidence: 99%

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Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Fernandes

Mota

Teixeira

et al. 2015

Biotechnology Advances

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“…Similarly, cultivation of microalgae for biomass and H 2 gas generation is shown. The figure is modified from Chen, Yeh, Aisyah, Show, Lee, and Chang (2011);Kwon, R€ ogner, and Rexroth (2012); Rosner and Wagner (2012). conditions to accumulate more biomass, and then cells are transferred into sulfurdeprived medium to induce H 2 production (Hankamer et al, 2007). The quality and quantity of light are also important for growing phototrophic microorganisms within the bioreactor.…”

Section: Designing Bioreactors To Harvesting Green Algaementioning

confidence: 99%

Hydrogen production using photobiological methods

Poudyal

Tiwari

Koirala

et al. 2015

Compendium of Hydrogen Energy

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“…These results indicate that S. subsalsus has a virtually null potential for biodiesel production, given its low concentrations of lipid. Despite the concrete perspectives of development of better photobioreactor systems that could improve the production and use of microalgae (e.g., Pulz, 2001;Kwon et al, 2012), this is unlike to be enough to increase such low concentrations of lipid (ca. 10-12% dw) to a level of viable use as a feedstock for biodiesel production (e.g., Schenk et al, 2008;Francisco et al, 2010;Rajvanshi & Sharma, 2012).…”

Section: Potential For Biodiesel Production and Conclusionmentioning

confidence: 99%

An assessment of the usefulness of the cyanobacterium Synechococcus subsalsus as a source of biomass for biofuel production

Setta¹,

Barbarino²,

Passos³

et al. 2014

lajar

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ABSTRACT. Nowadays algal biofuels are considered one of the most promising solutions of global energy crisis and climate change for the years to come. By manipulation of the culture conditions, many algal species can be induced to accumulate high concentrations of particular biomolecules and can be directed to the desired output for each fuel. In this context, the present study involved the assessment of the effects of CO 2 availability and nitrogen starvation on growth and chemical composition of the cyanobacterium Synechococcus subsalsus, testing a fast-growing native strain. The control experiments were performed with Conway culture medium in 12-day batch cultures, in 6-liter flasks and 12 h photoperiod, with addition of 2 L min -1 filtered air to each flask. Other two experimental conditions were also tested: (i) the placement into the cultures of additional dissolved nutrients except nitrogen, one week after the start of growth (N-), and (ii) the input of pure CO 2 into the flasks from the 5 th day of growth (C+). In all cultures, daily cell counts were done throughout the cultivation, as well as measurements of pH and cell biovolumes. Maximum cell yield were found in N-experiments, while cell yields of C+ and control were similar. Dissolved nitrogen was exhausted before the end of the experiments, but dissolved phosphorus was not totally consumed. Protein and chlorophyll-a concentrations decreased from the exponential to the stationary growth phase of all experiments, except for protein in the control. In all experiments, carbohydrate, lipid and total carotenoid increased from the exponential to the stationary growth phase, as an effect of nitrogen limitation. Increments in carbohydrate concentrations were remarkable, achieving more than 42% of the dry weight (dw), but concentrations of lipid were always lower than 13% dw. The addition of pure CO 2 did not cause a significant increase in biomass of S. subsalsus nor generated more lipid and carbohydrate than the other treatments. Nitrogen starvation caused an intense accumulation of carbohydrate, but the increments of lipid were small. Despite the fast growth, the cyanobacterium S. subsalsus has a virtually null potential for biodiesel production, given its low lipid concentrations. The high concentrations of carbohydrate combined with fast growth point to the potential use of this species as raw material for other possible biotechnological processes, after a demonstration of technical and economic viability. Keywords: biodiesel, biomass, cultivation, lipid, microalgae, cyanobacteria, productivity.Evaluación de la utilidad de la cianobacteria marina Synechococcus subsalsus como fuente de biomasa para la producción de biocombustibles RESUMEN. Actualmente los biocombustibles elaborados con algas se consideran una de las soluciones más prometedoras de la crisis energética mundial y el cambio climático para los años venideros. Mediante la manipulación de las condiciones de cultivo, muchas especies de algas pueden ser inducidas para acumular altas concentracione...

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Direct approach for bioprocess optimization in a continuous flat-bed photobioreactor system

Cited by 28 publications

References 33 publications

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Hydrogen production using photobiological methods

An assessment of the usefulness of the cyanobacterium Synechococcus subsalsus as a source of biomass for biofuel production

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