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1.
J Biosci Bioeng ; 117(1): 92-8, 2014 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-23932358

RESUMEN

The internally illuminated photobioreactor (IIPBR) design has been shown to be more efficient in utilizing the incident light energy than the externally illuminated designs. This study evaluated (i) optimal sparging of the IIPBR with CO2-enriched air (CEA) to enhance biomass productivity; and, (ii) single-stage and two-stage operation of the IIPBR to enhance lipid productivity. Growth data from two algal cultures-Scenedesmus sp. and Nannochloropsis salina, cultivated in an 18-L prototype version of the IIPBR were used to establish the optimal conditions for the two goals in terms of the energy ratio. Based on the optimized results under sparging with CEA, the energy ratio in the IIPBR in the first stage with Nannochloropsis salina was at least 6 times higher due to optimal performance of the IIPBR at lower energy input than typical literature results for other PBR designs, whereas the energy ratios in the second stage were comparable to literature results.


Asunto(s)
Biomasa , Luz , Lípidos/análisis , Microalgas/crecimiento & desarrollo , Fotobiorreactores , Dióxido de Carbono/metabolismo , Microalgas/metabolismo , Termodinámica
2.
Bioresour Technol ; 126: 266-73, 2012 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23079413

RESUMEN

An internally illuminated photobioreactor (IIPBR) design is proposed for energy-efficient biomass production. Theoretical rationale of the IIPBR design and its advantages over the traditional bubble column photobioreactors (PBRs) are presented, followed by experimental results from prototype scale cultivation of freshwater and marine algal strains in an 18L IIPBR. Based on theoretical considerations, the proposed IIPBR design has the potential to support 160% higher biomass density and higher biomass productivity per unit energy input, B/E, than a bubble column PBR of equal incident area per unit culture volume. Experimental B/E values recorded in this study with fresh water algae and marine algae (1.42 and 0.37 gW(-1)d(-1), respectively) are at least twice as those reported in the literature for comparable species cultivated in bubble column and airlift PBRs.


Asunto(s)
Biomasa , Biotecnología/instrumentación , Biotecnología/métodos , Eucariontes/crecimiento & desarrollo , Fotobiorreactores , Eucariontes/efectos de la radiación , Gases/análisis , Luz , Termodinámica
3.
Bioresour Technol ; 124: 137-45, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22989642

RESUMEN

A theoretical model for predicting biomass growth in semi-continuous mode under sparging with CO(2)-enriched air was developed. The model includes gas-to-liquid mass transfer, algal uptake of carbon dioxide, algal growth kinetics, and light and temperature effects. The model was validated using experimental data on growth of two microalgal species in an internally illuminated photobioreactor: Nannochloropsis salina under gas flow rates of 800 and 1200 mL min(-1) and CO(2) enrichments of 0.5, 1, and 2%; and Scenedesmus sp. at a gas flow rate of 800 mL min(-1) and CO(2) enrichments of 3 and 4%. Temporal algal concentration profiles predicted by the model under semi-continuous mode with harvesting under the different test conditions agreed well with the measured data, with r(2) values ranging from 0.817 to 0.944, p<0.001. As demonstrated, this model can be beneficial in predicting temporal variations in algal concentration and in scheduling harvesting operations under semi-continuous cultivation mode.


Asunto(s)
Aire , Dióxido de Carbono/química , Microalgas/crecimiento & desarrollo , Biomasa , Reactores Biológicos , Calibración , Microalgas/metabolismo , Modelos Biológicos
4.
Biotechnol Lett ; 33(11): 2161-7, 2011 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-21766245

RESUMEN

An annular internally illuminated photobioreatcor (IIPBR) configuration based on the airlift/bubble column principles was developed and validated at an 18 l prototype scale using Scenedemus sp. and Nannochloropsis salina in batch and semi-continuous modes, at constant light supply and constant gas-to-culture volume ratio, but at varying CO(2)-to-air ratios. Highest biomass production was recorded at CO(2)-to-air ratio of 4% with Scenedesmus sp. and at 1% with Nannochloropsis salina. The energetic performance of this IIPBR was quantified in terms of biomass productivity per unit energy input, P/E (g W(-1) day(-1)), considering energy input for illumination and for pneumatic mixing and circulation. Under optimal conditions, the IIPBR evaluated in this study achieved P/E of 1.42 g W(-1) day(-1) for Scenedesmus sp. and P/E of 0.34 g W(-1) day(-1) for Nannochloropsis salina. These P/E values are better than those estimated for airlift and bubble column photobioreactor configurations reported in the literature.


Asunto(s)
Luz , Fotobiorreactores/microbiología , Scenedesmus/crecimiento & desarrollo , Scenedesmus/metabolismo , Estramenopilos/crecimiento & desarrollo , Estramenopilos/metabolismo , Biomasa , Metabolismo Energético
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