Metal and metalloid removal in constructed wetlands, with emphasis on the importance of plants and standardized measurements : A review
Language
en
Article de revue
This item was published in
Environmental Pollution. 2010, vol. 158, n° 12, p. 3447-3461
Elsevier
English Abstract
This review integrates knowledge on the removal of metals and metalloids from contaminated waters in constructed wetlands and offers insight into future R&D priorities. Metal removal processes in wetlands are described. ...Read more >
This review integrates knowledge on the removal of metals and metalloids from contaminated waters in constructed wetlands and offers insight into future R&D priorities. Metal removal processes in wetlands are described. Based on 21 papers, the roles and impacts on efficiency of plants in constructed wetlands are discussed. The effects of plant ecotypes and class (monocots, dicots) and of system size on metal removal are addressed. Metal removal rates in wetlands depend on the type of element (Hg > Mn > Fe = Cd > Pb = Cr > Zn = Cu > Al > Ni > As), their ionic forms, substrate conditions, season, and plant species. Standardized procedures and data are lacking for efficiently comparing properties of plants and substrates. We propose a new index, the relative treatment efficiency index (RTEI), to quantify treatment impacts on metal removal in constructed wetlands. Further research is needed on key components, such as effects of differences in plant ecotypes and microbial communities, in order to enhance metal removal efficiency. A new index, the relative treatment efficiency index (RTEI), to quantify treatment impacts on metal and metalloid removal in constructed wetlands.Read less <
Keywords
POLLUTION
ÉLIMINATION DES MÉTAUX
EFFICACITÉ DES PLANTES
INDICE D'EFFICACITÉ DE TRAITEMENT
English Keywords
METAL
ECOTYPE
MACROPHYTE
MICRO-ORGANISM
PHYTOREMEDIATION
WASTEWATER
Origin
Hal imported