Wastewater treatment using Scenedesmus almeriensis: Effect of operational conditions on the composition of the microalgae-bacteria consortia
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Sánchez-Zurano, Ana; Lafarga, Tomás; Morales-Amaral, María del Mar; Gómez-Serrano, Cintia; Fernández-Sevilla, José María; [et al.]Fecha
2021-05-21Resumen
Primary urban wastewater was treated in outdoor raceways using a microalgae-bacteria consortia dominated by Scenedesmus almeriensis. The current study aimed at assessing the effect of operational conditions, namely culture depth and dilution rate, on: (i) biomass productivity; (ii) the nutrient removal capacity, and (iii) the composition of the microalgae-bacteria consortium and the presence of unwanted microorganisms. Optimum dilution rates to process large quantities of wastewater during summer and achieve high biomass productivities were 0.3-0.5 day-1. Under the optimum operational conditions, nitrogen and phosphorus removal rates were higher than 90% while removal of chemical oxygen demand was 70%. Operating at different culture depths had a striking effect on the composition of the microalgae-bacteria consortium. The relative abundance of nitrifiers increased with culture depth and was minimised at 0.05 m: larger culture depths led to enhanced nitrifying activity and therefore to ...