Production of metabolites from "Scenedesmus sp." and a microalgal consortium cultured in unconventional media
2021
espanolGrowth comparisons were made between a microalgal consortium and Scenedesmus sp. cultivated in treated wastewater (TWw) enriched with 1 mL·L¯¹ Bayfolan Forte fertilizer (BM), TWw enriched with (NH4)2HPO4 (PAM), TWw enriched with NH4HCO3 (BCAM), tap water with piggery wastewater (PEM), tap water with piggery wastewater digestate (PDM), and raw wastewater (Ww). Nitrogen (N) content in the media, except for TWw, was adjusted to 80 mg·L¯¹ N (NH4+-N and NO3–-N). Unconventional low-cost media with lower nutrient contents (BM and TWw) showed adequate productions of biomass and lipids. PEM was the most advantageous medium, showing the highest biomass productivity with the consortium (191.25 ± 6.25 g·L¯¹·d¯¹) and a lipid productivity of 36.75 ± 9.90 mg·L¯¹·d¯¹. The fatty acid profile was com-posed mainly of C16 and C18. PAM, PEM, and PDM showed a higher proportion of saturated fatty acids (60%–69%), whereas the composition of unsaturated fatty acids was in the range of 31% to 38%. In PEM and PDM the removal of NH4+ was 100%; however, there were NH4+ losses (as NH3) due to volatilization (46%). Unconventional media, especially Ww, are an option for growing microalgae. EnglishSe comparo el crecimiento de un consorcio de microalgas y de Scenedesmus sp. cultivados en aguas residuales tratadas (ART) enriquecidas con 1 mL·L¯¹ de fertilizante Bayfolan Forte (MB), ART enriquecidas con (NH4)2HPO4 (MPA), ART enriquecidas con NH4HCO3(MBCA), agua del grifo con aguas residuales porcinas (MEP), agua del grifo con digestato de aguas residuales porcinas (MDP) y aguas resi-duales sin tratar (AR). El contenido de nitrogeno (N) de los medios, excepto el medio AR, se ajusto a 80 mg·L¯¹ de N (NH4+-N y NO3–-N). Los medios no convencionales con menor contenido de nutrientes y costo (MB y AR) presentaron buenas producciones de biomas y lipidos. MEP fue el medio mas ventajoso al presentar la mayor productividad de biomasa con el consorcio (191.25 ± 6.25 g·L¯¹·d¯¹) y una productividad de lipidos de 36.75 ± 9.90 mg·L¯¹·d¯¹. El perfil de acidos grasos estuvo constituido principalmente de C16 y C18. MPA, MEP y MDP mostraron una mayor proporcion de acidos grasos saturados (60%–69%), mientras que la composicion de los acidos grasos insaturados oscilo entre 31% y 38%. En MEP y MDP, la eliminacion de NH4+ fue del 100%; sin embargo, hubo perdidas de NH4+ debido al arrastre por aire (46%). Los medios no convencionales, especificamente las AR, son una opcion para el cultivo de microalgas.
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