Utilization of Anabaena sp. in CO₂ removal processes: modelling of biomass, exopolysaccharides productivities and CO₂ fixation rate

Applied Microbiology and Biotechnology
J F Sánchez FernándezE Molina Grima

Abstract

This paper focuses on modelling the growth rate and exopolysaccharides production of Anabaena sp. ATCC 33047, to be used in carbon dioxide removal and biofuels production. For this, the influence of dilution rate, irradiance and aeration rate on the biomass and exopolysaccharides productivity, as well as on the CO(2) fixation rate, have been studied. The productivity of the cultures was maximum at the highest irradiance and dilution rate assayed, resulting to 0.5 g(bio) l(-1) day(-1) and 0.2 g(eps) l(-1) day(-1), and the CO(2) fixation rate measured was 1.0 gCO(2) l(-1) day(-1). The results showed that although Anabaena sp. was partially photo-inhibited at irradiances higher than 1,300 μE m(-2) s(-1), its growth rate increases hyperbolically with the average irradiance inside the culture, and so does the specific exopolysaccharides production rate. The latter, on the other hand, decreases under high external irradiances, indicating that the exopolysaccharides metabolism hindered by photo-damage. Mathematical models that consider these phenomena have been proposed. Regarding aeration, the yield of the cultures decreased at rates over 0.5 v/v/min or when shear rates were higher than 60 s(-1), demonstrating the existence of thus e...Continue Reading

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Citations

Feb 8, 2013·Applied Microbiology and Biotechnology·Juan C LópezRaúl Muñoz
Apr 10, 2013·Bioresource Technology·Yvonne Y S ChowYuan Kun Lee
Aug 28, 2012·Applied Microbiology and Biotechnology·F Gabriel Acién FernándezE Molina Grima

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