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En el presente estudio se estableció las condiciones para el cultivo autotrófico y mixotrófico de Scenedesmus sp, utilizando efluentes de drenajes ácidos de mina de carbón con el objeto de estudiar la producción de biomasa y de carotenoides tanto en condiciones autótrofas y mixotróficas en relación con el efecto de diferentes fuentes de nitrógeno: nitrato de sodio, la urea y el fosfato de amonio. Se determinó la remoción de contaminantes como DQO, COT, Metales pesados, iones y Sólidos Suspendidos totales. Los cultivos fueron por lote durante nueve días y se comparó la producción de biomasa, carotenoides y remoción de contaminantes en cada condición. La mayor concentración de biomasa alcanzada fue de 1,2 g/L se alcanzó en el cultivo mixotrófico para el medio con urea, seguido por del medio con nitrato de sodio de 0,9 g/L en una relación C/N de 6:1. La mayor concentración específica de carotenoides se alcanzó en el cultivo mixotrófico para el medio con nitrato de sodio y fue de 19.43 mg carotenoides / g biomasa. El medio con fosfato de amonio resultó ser inhibitorio para el crecimiento de la microalga con los resultados más bajos de todos los parámetros con excepción del cultivo autotrófico donde la concentración de carotenoides fue muy similar que las alcanzadas con el medio con nitrato de sodio y urea. Finalmente, el cultivo mixótrófico en el medio con urea presentó los mayores porcentajes de remoción siendo 86,97% para hierro total, 58,29% para cloruros y 92,5% para DQO.

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Recibido 2021-05-19
Aceptado 2021-07-13
Publicado 2021-10-30