Author(s): Michele Di Natale; Roberto Greco; Antonio Molino; Dino Musmarra
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Keywords: Groundwater remediation; Chrome ions adsorption; Groundwater flow and transport modelling; Permeable barrier
Abstract: The problem of designing permeable adsorbing barriers to protect groundwater from heavy metals pollution is investigated. To this aim, mathematical modeling of groundwater flow and conservative solutes transport in presence of adsorbing materials is briefly discussed. Barrier design is shown to depend either on soil hydraulic conductivity and dispersivities, or on barrier material adsorption isotherm. Hexavalent chrome adsorption isotherms experimentally determined for two adsorbing media under various conditions were used. Hydraulic model experiment was carried out in order to estimate soil hydraulic conductivity, Ksat, and longitudinal and transverse dispersivities, αL and αT. An example of design of permeable adsorbing barrier is eventually given. Barrier performance is evaluated by numerically solving at finite elements flow and transport equations.
Year: 2005