Innovative reactive layer to enhance soil aquifer treatment: successful installation in the Llobregat aquifer (Catalonia, Ne Spain)

M. Hernández; O. Gibert; X. Bernat; C. Valhondo; M. Köck-Schulmeyer; M. Huerta-Fontela; M. V. Colomer

doi:10.21701/bolgeomin.125.2.003

Autores/as

M. Hernández CeTaqua, Water Technology Center
O. Gibert CeTaqua, Water Technology Center
X. Bernat CeTaqua, Water Technology Center
C. Valhondo IDAEA-CSIC Institute of environmental Assessment and Water Research
M. Köck-Schulmeyer IDAEA-CSIC Institute of environmental Assessment and Water Research
M. Huerta-Fontela AMB Laboratory
M. V. Colomer ACA Water Catalan Agency

DOI:

https://doi.org/10.21701/bolgeomin.125.2.003

Palabras clave:

Balsa de Infiltración, Capa Reactiva, Contaminantes Emergentes, Recarga de Acuíferos, Río Llobregat, Tratamiento Suelo-Acuífero

Resumen

El proyecto Life+ ENSAT ha demostrado la eficiencia en la mejora de la calidad del agua de recarga mediante la instalación de una capa reactiva en un sistema de recarga de acuíferos. La capa, constituida principalmente por compost vegetal, fue instalada en la sub-superficie de una balsa de recarga construida en el Valle Bajo del Llobregat (provincia de Barcelona), con el objetivo de promover la biodegradación y mejorar la eliminación de microcontaminantes emergentes del agua del Llobregat. El exhaustivo seguimiento de la calidad del agua que incluye química general, contaminantes emergentes y sustancias prioritarias, indica que los cambios hidrobiogeoquímicos con el sistema implantado mejoran los procesos de desnitrificación y la reducción de concentración de gemfibrozilo y carbamazepinaepoxy). Esta mejora se debe a la liberación de carbón orgánico disuelto, que promueve los procesos de biodegradación a escala local en la zona no saturada, sin efecto en los piezómetros de control más alejados. La capa reactiva sigue activa después de más de tres años desde su instalación.

La evaluación económica de la capa reactiva muestra que es una solución prometedora para la mejora de la recarga de acuíferos con aguas de baja calidad, no sólo desde el punto de vista técnico, sino desde el punto de vista de la sostenibilidad económica.

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