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Bioethanol Production by Carbohydrate-Enriched Biomass of Arthrospira (Spirulina) platensis

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Author(s): Giorgos Markou | Irini Angelidaki | Elias Nerantzis | Dimitris Georgakakis

Journal: Energies
ISSN 1996-1073

Volume: 6;
Issue: 8;
Start page: 3937;
Date: 2013;
Original page

Keywords: Arthrospira (Spirulina) | bioethanol | fermentation | microalgae | pretreatment | acid hydrolysis | thermal hydrolysis

ABSTRACT
In the present study the potential of bioethanol production using carbohydrate-enriched biomass of the cyanobacterium Arthrospira platensis was studied. For the saccharification of the carbohydrate-enriched biomass, four acids (H2SO4, HNO3, HCl and H3PO4) were investigated. Each acid were used at four concentrations, 2.5 N, 1 N, 0.5 N and 0.25 N, and for each acid concentration the saccharification was conducted under four temperatures (40 °C, 60 °C, 80 °C and 100 °C). Higher acid concentrations gave in general higher reducing sugars (RS) yields (%, gRS/gTotal sugars) with higher rates, while the increase in temperature lead to higher rates at lower acid concentration. The hydrolysates then were used as substrate for ethanolic fermentation by a salt stress-adapted Saccharomyces cerevisiae strain. The bioethanol yield (%, gEtOH/gBiomass) was significantly affected by the acid concentration used for the saccharification of the carbohydrates. The highest bioethanol yields of 16.32% ± 0.90% (gEtOH/gBiomass) and 16.27% ± 0.97% (gEtOH/gBiomass) were obtained in hydrolysates produced with HNO3 0.5 N and H2SO4 0.5 N, respectively.
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