Jorge Alberto Vieira Costa,Adriano Arruda Henrard and Michele Greque de Morais
College of Chemistry and Food Engineering, Federal University of Rio Grande, Rio Grande-RS, Brazil
Industrial activity and power generation in thermal power plants emit into the atmosphere about 20 billion tons of CO2 per year Microalgae represent photosynthetic microorganisms and their importance in nature mainly refers to the high CO2 biofixation. The objective of this project was to develop processes to flue gas biofixation by microalgae in a coal thermal power plant. Microalgae were cultivated in bench scale in different open and closed photobioreactors using the fuel gas to assessment the best results. In Thermal Power Plant President Medici (Candiota, RS, Brazil) was installed a pilot plant for biofixation of flue gas by microalgae. In this plant were carried out microalgal cultivations in two Raceway bioreactors with 18,000 L each. Relevant results from CO2 biofixation by microalgae in bench scale were obtained in cultures with injection of 6% and 12% of carbonic gas, with values of approximately 53% and 45%, respectively. Microalgae exposed to 12% CO2, 60 ppm SO2 and 100 ppm NO, simulating the combustion gas emitted during burning coal, reached daily biofixation of approximately 14%.
Acknowledgments: The authors thank the R & D Program ANEEL - Eletrobrás CGTEE by the financial support to conduct this work.
Keywords: Carbon Dioxide, Coal, Fuel Gases, Greenhouse Gases.