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Publicação
Fitoestabilização de sedimentos contaminados por metais e metalóides
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Autores
Orientador(es)
Resumo(s)
Wastes of a former steel industry were deposited during 40 years on the left bank of the Coina River, an affluent of the Tagus River, near its estuary, creating a landfill that is connected to the river itself. Tides penetrate and exit the landfill, creating a periodic lagoon that shows resemblances to the salt marshes nearby, being colonized by salt marsh plants.
This study aims: a) to evaluate the level of contamination of the lagoon by doing a biogeochemi-cal study, b) to evaluate the level of dispersion of the contaminants through a leaching assay, and c) to evaluate the capacity of Tamarix africana Poiret to be used in the phytostabilization of the contaminated sediment.
The sediment is considered contaminated by As, Cd, Cr, Cu, Pb and Zn. It also presents high con-centrations in Fe and Al.
The contaminant chemical elements seem to be associated to the sediment phases (adsorbed, co-precipitated etc.), as the concentrations of the elements were very low in pore water and leachates, as well as in the river water.
Salt marsh plants are able to uptake contaminants without showing signs of toxicity, being the contaminants mostly retained in the roots. Tamarix africana shows potential to be used for phytostabilization, but with caution, as this species can excrete contaminants by its leaves leading to the precipitation of salts.
Descrição
Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia
Palavras-chave
leachates metals metalloids phytostabilization sediment salt marsh Tamarix africana
Contexto Educativo
Citação
Peres, S.I.C. - Fitoestabilização de sedimentos contaminados por metais e metalóides. Lisboa: ISA, 2014, 90 p.