Fitodepuración mixotrófica en sistemas de recirculación acuícola (RAS) para el manejo sustentable de nutrientes contaminantes
DOI:
https://doi.org/10.33936/at.v3i1.3484Palabras clave:
Acuicultura intensiva, Biofiltro nitrificante, Tratamiento de agua, Biomasa, Economía circularResumen
La acuicultura industrial ha crecido rápidamente debido al aumento en la demanda mundial de pescados y mariscos, lo que ha estimulado el desarrollo de sistemas acuícolas de cultivo de especies marinas. La necesidad de mantener altos niveles de productividad los convierte en sistemas complejos e inestables, propensos a sufrir perturbaciones con riesgo potencial de causar problemas de contaminación del ambiente natural. En las operaciones de acuicultura intensiva se estima que en los procesos de transformación para el desarrollo y crecimiento de la biomasa, aproximadamente el 75% del alimento es liberado en forma de nitrógeno y fósforo. Durante las últimas décadas se han realizado esfuerzos para el desarrollo de procesos de eliminación de estos nutrientes-contaminantes, que de otra manera serían liberados a los cuerpos de agua natural, causando eutrofización. El sistema de acuicultura con recirculación (RAS) es el sistema convencional de cultivo; incluye una etapa de remoción de nutrientes con biofiltros de bacterias aerobias que favorecen el proceso de nitrificación, aunque la tecnología de biofiltros tiene dificultades operacionales tales como la disminución en la concentración de oxígeno, acumulación de materia orgánica y dificultad de retroenjuague, entre otras. Así, han surgido opciones basadas en la actividad de organismos fotoautotróficos aprovechando la capacidad de plantas acuáticas, macro y microalgas, de eliminar con eficacia nutrientes-contaminantes (fitodepuración), consumiendo además de carbono y nitrógeno, también el fosforo, este último sin capacidad de ser removido con biofiltros nitrificantes. Sin embargo, esta estrategia de tratamiento no se ha utilizado en acuicultura intensiva debido a la alta disponibilidad de superficie demandada y que supera la requerida por los compactos equipos de para biofiltración nitrificante. La fitodepuración mixotrófica, que corresponde a la integración de dos tecnologías de tratamiento terciario de aguas residuales (biofiltración-autotrófica y fitodepuración), podrían ser una respuesta eficiente para el tratamiento de aguas residuales acuícolas, dada la interacción entre los organismos involucrados. Por ello, esta revisión se enfoca al potencial uso de los cultivos mixotróficos para el control de nutrientes-contaminantes en “RAS” o aguas residuales acuícolas, además de aportar al desarrollo de economía circular.
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