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Permeable Reactive Barriers and heavy-metals contaminated groundwater: study of new reactive media and of related treatment processes
Treatment of contaminated groundwater by means of Permeable Reactive Barriers (PRBs) is an increasingly employed technique. However, not many reactive media are currently available: these have to meet geotechnical, geochemical and economical criteria. The current project focuses on the study of new reactive media to use in treatment of heavy-metals contaminated groundwater. For this purpose laboratory tests are carried out: batch-test are performed to screen a wide range of candidate materials; column-tests are performed to obtain contaminant breakthrough curves and to estimate contaminant retardation factors. Candidate reactive media for removal of cationic heavy metals include clays (rich in attapulgite and sepiolite) and zeolites (a chabazite-rich tuff and clinoptilolite). Candidate media for removal of metals with anionic behavior (chromate) include zero-valent iron, iron hydroxides and hydrated aluminum oxides (bauxite). Activated coal is used as a reference material.
Authors:Ambrosini, Gianluca and Hermanns Stengele, Rita
Index Terms:groundwater; Permeable Reactive Barriers; Permeable Reactive Barriers; ClayGroup
Further Information:Date published: 12.12.2003