Please use this identifier to cite or link to this item: http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1168
Arsenic Retention and Distribution in Treatment Wetlands
MARIA TERESA ALARCON HERRERA
MARIO ALBERTO OLMOS MARQUEZ
IGNACIO MARTIN
Acceso Abierto
Sin Derechos Reservados
Arsenic
Treatment Wetlands
Arsenic (As) can be removed from water through its retention in constructed wetlands. The aim of this study was to analyze the arsenic retention in treatment wetland prototypes, as well as its distribution along the flow gradient in a treatment wetland mesocosmos. Experiments were carried out in laboratoryscale wetland prototypes, two planted with E. macrostachya and one without plants. Samples of water were taken at the inlet and outlet of the prototype during the testing period. At the end of the experiment, plants and soil (silty-sand) from each prototype were divided in three equal segments (entrance, middle and exit) and analyzed for their arsenic content. Results revealed that the planted wetlands have a higher As-mass retention capacity (87- 90% of the total As inflow) than prototypes without plants (27%). As-mass balance in the planted wetlands revealed that 78% of the total inflowing As was retained in the soil bed. Nearly 2% was absorbed in the plant roots. In the prototype without plants, the soil retained only 16% of As-mass, 72% of the arsenic was accounted for in the outflow. The plants retained only 2% of the total arsenic mass in their roots; however its presence was determinant for arsenic retention in the wetland soil medium. Therefore, it can be assumed that treatment wetlands are a suitable option for treating As-contaminated water.
2014
Memoria de congreso
Inglés
OTRAS
Versión revisada
submittedVersion - Versión revisada
Appears in Collections:Artículos en Congresos

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