Ano
2015

Autores
Souza, S. P., Gopal, A. R., & Seabra, J. E.

Life cycle assessment of biofuels from an integrated Brazilian algae-sugarcane biorefinery


Print this pageEmail this to someoneShare on Google+Share on FacebookTweet about this on TwitterShare on LinkedIn

Referência Bibliográfica: Souza, S. P., Gopal, A. R., & Seabra, J. E. (2015). Life cycle assessment of biofuels from an integrated Brazilian algae-sugarcane biorefinery. Energy, 81, 373-381.

Periódico: Energy
DOI: 10.1016/j.energy.2014.12.050

Resumo: Sugarcane ethanol biorefineries in Brazil produce carbon dioxide, electricity and heat as byproducts. These are essential inputs for algae biodiesel production. In this paper, we assessed ethanol’s life cycle greenhouse gas emissions and fossil energy use produced in an integrated sugarcane and algae biorefinery where biodiesel replaces petroleum diesel for all agricultural operations. Carbon dioxide from cane juice fermentation is used as the carbon source for algae cultivation, and sugarcane bagasse is the sole source of energy for the entire facility. Glycerin produced from the biodiesel plant is consumed by algae during the mixotrophic growth phase. We assessed the uncertainties through a detailed Monte-Carlo analysis. We found that this integrated system can improve both the life cycle greenhouse gas emissions and the fossil energy use of sugarcane ethanol by around 10% and 50%, respectively, compared to a traditional Brazilian sugarcane ethanol distillery.