Nitrogen balance estimation in a subsurface flow constructed wetland planted with Heliconia psittacorum for domestic wastewater treatment

Harry Gutiérrez Mosquera; Miguel Ricardo Peña Varón; Alexander Aponte Reyes

doi:10.17533/udea.redin.14656

Autores/as

Harry Gutiérrez Mosquera Tecnológico de Antioquia
Miguel Ricardo Peña Varón Universidad del Valle
Alexander Aponte Reyes Universidad del Valle

DOI:

https://doi.org/10.17533/udea.redin.14656

Palabras clave:

balance de nitrógeno, desnitrificación, eliminación de nitrógeno, Heliconia psittacorum, humedal construido, asimilación por la planta

Resumen

La influencia de la vegetación (Heliconia psittacorum) y el principal mecanismo de eliminación de nitrógeno en un humedal construido de flujo subsuperficial (HFSS) fueron estudiados por la aplicación de un balance de N. Para ésto se construyeron seis unidades de HFSS a escala de laboratorio (microcosmos) que incluyeron lechos de grava plantados con Heliconia sp. y sin plantar (controles), sometidos a una carga de 5,68 g N m-2 d-1 y un tiempo nominal de retención de 1,0 día. Los resultados indicaron una mayor eficiencia de eliminación de la carga de N en los microcosmos plantados (29,6%) comparado con los sin plantar (24,3%). El balance de masas indicó que el principal mecanismo de eliminación de N fue la nitrificación/desnitrificación al eliminar el 66,7 y 69,7% del N eliminado en los microcosmos plantados y sin plantar, respectivamente. La acumulación en el medio de soporte eliminó el 21,4 y 22,0% del N, respectivamente. Mientras que una pequeña asimilación del N por la Heliconia sp. fue establecida (0,6%). Pese a la baja asimilación directa de N por parte de la planta, fue evidente que éstas contribuyeron indirectamente a la eliminación de N en los microcosmos plantados vía latranslocación de oxígeno atmosférico y el ensamblaje de una comunidad microbiana más diversa en la rizósfera.

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Biografía del autor/a

Harry Gutiérrez Mosquera, Tecnológico de Antioquia

Facultad de Ciencias de la Tierra y del Ambiente.

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