Utilization of secondary-treated wastewater for the production of freshwater microalgae
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Author/sGómez-Serrano, Cintia; Morales-Amaral, Maria del Mar; Acién, F. Gabriel; Escudero, Rosa; Fernández-Sevilla, Jose M.; [et al.]
In this work we studied the potential use of secondary-treated wastewater as nutrient source in the production of freshwater microalgae strains. Experiments were performed indoors in semicontinuous mode, at 0.3 day-1, simulating outdoor conditions. We demonstrated that all the tested strains can be produced by using only secondary-treated wastewater as the nutrient source. The utilization of secondary-treated wastewater imposes nutrient-limiting conditions, with maximal biomass productivity dropping to 0.5 g·l-1·day-1and modifies the biochemical composition of the biomass by increasing the amount of lipids and carbohydrates while reducing the biomass protein content. We measured fatty acids content and productivity of up to 25%d.wt. and 110 mg·l-1·day-1, respectively. We demonstrated that all the tested strains were capable of completely removing the nitrogen and phosphorus contained in the secondary-treated wastewater, and while the use of this effluent reduced the cells’ photosynthet...
microalgae, wastewater, nutrient limitation, productivity, biochemical composition, light efficiency