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

Giorgos Markou, Irini Angelidaki, Elias Nerantzis and Dimitris Georgakakis
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Giorgos Markou: Department of Natural Resources Management and Agricultural Engineering, Agricultural University of Athens, Iera Odos 75, Athens 11855, Greece
Irini Angelidaki: Department of Environmental Engineering, Building 113, Technical University of Denmark, Lyngby 2800, Denmark
Elias Nerantzis: Biotechnology and Industrial Fermentations Lab, Faculty of Food Science and Nutrition, Technological Educational Institution of Athens, Ag. Spyridon Street, Egaleo 12210, Athens, Greece
Dimitris Georgakakis: Department of Natural Resources Management and Agricultural Engineering, Agricultural University of Athens, Iera Odos 75, Athens 11855, Greece

Energies, 2013, vol. 6, issue 8, 1-14

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 (H 2 SO 4 , HNO 3 , HCl and H 3 PO 4 ) 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 (%, g RS /g Total 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 (%, g EtOH /g Biomass ) was significantly affected by the acid concentration used for the saccharification of the carbohydrates. The highest bioethanol yields of 16.32% ± 0.90% (g EtOH /g Biomass ) and 16.27% ± 0.97% (g EtOH /g Biomass ) were obtained in hydrolysates produced with HNO 3 0.5 N and H 2 SO 4 0.5 N, respectively.

Keywords: Arthrospira (Spirulina); bioethanol; fermentation; microalgae; pretreatment; acid hydrolysis; thermal hydrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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