Influência geoespacial no desempenho de fotobiorreatores

Abstract

Microalgae are photosynthetic microorganisms from which a variety of compounds with potential for application in different industry sectors can be extracted. As microalgae productivity in outdoor cultivation systems depends strongly on sunlight, temperature, and photoperiod, climate variability as a function of geographic position represents a significant challenge for the standardization of commercial-scale production processes. Therefore, the objective of this work was: (i) to map the performance of the microalgae Scenedesmus obliquus CPCC05 in photobioreactors, (ii) assess the effect of the climate variability according to geographical position in the biomass production of the microalgae Scenedesmus obliquus CPCC05, (iii) assess the lipid composition of the microalgal biomass, (iv) assess the fatty acid composition of the microalgal biomass. The results showed significant variations in the microalgae productivity and in the proportion of fatty acids. Under the light intensity of 2100.9 μmol.m-2.s-1, temperature of 28.75 °C and day length of 12.52 h, it was obtained the highest productivity of biomass (0.347 g/L.d) and lipids (0.048 g/L.d). The biomass productivity ranged from 0.009 to 0.347 g/L.d and lipid productivity from 0.0008 to 0.048 g/L.d for the different geographic positions. In parallel, the proportion of saturated fatty acids ranged from 31.39 to 65.68%, monounsaturated from 8.28 to 28.72% and polyunsaturated from 21.37 to 57.78%. The results of this work provide important information about the effects of spatial and temporal variation of climate on the photosynthetic metabolism of the microalgae Scenedesmus obliquus CPCC05.