title: CO2 Biofixation by the Cyanobacterium Spirulina sp. LEB 18 and the Green Alga Chlorella fusca LEB 111 Grown Using Gas Effluents and Solid Residues of Thermoelectric Origin.
abstract: The concentration of carbon dioxide (CO2) in the atmosphere has increased from 280 to 400 ppm in the last 10 years, and the coal-fired power plants are responsible for approximately 22 % of these emissions. The burning of fossil fuel also produces a great amount of solid waste that causes serious industrial and environmental problems. The biological processes become interesting alternative in combating pollution and developing new products. The objective of this study was to evaluate the CO2 biofixation potential of microalgae that were grown using gaseous effluents and solid residues of thermoelectric origin. The microalgae Chlorella fusca LEB 111 presented higher rate of CO2 biofixation (42.8 %) (p < 0.01) than did Spirulina sp. LEB 18. The values for the CO2 biofixation rates and the kinetic parameters of Spirulina and Chlorella cells grown using combustion gas did not differ significantly from those of cells grown using CO2 and a carbon source in the culture media. These microalgae could be grown using ash derived from coal combustion, using the minerals present in this residue as the source of the essential metals required for their growth and the CO2 derived from the combustion gas as their carbon source.
authors.affiliation: Laboratory of Microbiology and Biochemical, College of Chemistry and Food Engineering, Federal University of Rio Grande, P.O. Box 474, Av. Itália Km 8, 96203-900, Rio Grande, RS, Brazil.
authors.forename: Bruna
authors.initials: B
authors.lastname: da Silva Vaz
authors.affiliation: Laboratory of Biochemical Engineering, College of Chemistry and Food Engineering, Federal University of Rio Grande, P.O. Box 474, Av. Itália Km 8, Rio Grande, 96203-900, RS, Brazil.
authors.forename: Jorge Alberto Vieira
authors.initials: JA
authors.lastname: Costa
authors.affiliation: Laboratory of Microbiology and Biochemical, College of Chemistry and Food Engineering, Federal University of Rio Grande, P.O. Box 474, Av. Itália Km 8, 96203-900, Rio Grande, RS, Brazil. michele.morais@pq.cnpq.br.
authors.forename: Michele Greque
authors.initials: MG
authors.lastname: de Morais
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism*; D002708:Chlorella / Q000254:growth & development / Q000378:metabolism*; D003470:Culture Media; D005579:Fossil Fuels; D005740:Gases; D007700:Kinetics; D053545:Spirulina / Q000254:growth & development / Q000378:metabolism*
chemical_list: D003470:Culture Media; D005579:Fossil Fuels; D005740:Gases; D002245:Carbon Dioxide
keywords: Ash; Carbon dioxide; Chlorella fusca LEB 111; Industrial residues; Microalgae; Spirulina sp. LEB 18