Análise técnica e avaliação do ciclo de vida de culturas de produção de microalgas para biodiesel

Content Provider	Semantic Scholar
Author	Galindro, Bruno Menezes
Copyright Year	2013
Abstract	One alternative currently being discussed for biodiesel production is the use of microalgae biomass for obtaining lipids. However, There are some processes of its production which need further study, such as the inputs. One possibility for an alternative raw material is the effluent from superintensive shrimp cultivation with bioflocs (BF). Therefore, the overall objective of this study was to perform technical and environmental evaluation of different cultures for production of microalgae for biodiesel. For technical evaluation, the microalgae were grown in three systems: (i) f/2 produced integrally with chemical fertilizers, (ii) BF use of 100% of the effluent and (iii) 50/50 with 50% of each medium. The productivity was evaluated according to the gain of biomass and lipids and esters accumulation. For environmental performance LCA was used and the functional unit was established as 1 kilogram of algae biomass containing 25% fat, produced in 30 days. The system boundaries were defined from the producing of raw materials to the dry algal biomass. The proposed scenarios for the environmental assessment were similar to those proposed before: being BF divided into two allocation procedures: BFa and BFb. The categories considered for environmental impact assessment were some of the CML 2000 and Cumulative Energy Demand. The productivity of biomass obtained in BF was 17.5% higher than the other and the accumulation of lipid values were similar in all the systems. Although, the productivity was low. Energy consumption was primarily responsible for the main environmental impacts observed, as regards acidification, human toxicity and global warming potential, being BFb the less impacting scenario and f/2 the most impacting one. For the eutrophication category, the scenario BFa was the most impacting scenario because of the emissions of nitrate and phosphate, and the BFb scenario showed positive impacts due to release of the effluent treatment of bioflocs. It is observed that the production system still requires changes to become feasible in industrial scale, especially as regards energy consumption.
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Alternate Webpage(s)	https://repositorio.ufsc.br/bitstream/handle/123456789/99431/311998.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article