Discharges and landfills leaching from solid waste landfill are often a significant source of
contamination both by inorganic and organic compound, causing the deterioration of groundwater quality.
The development of efficient technologies applicable to groundwater remediation is a fundamental
objective for environmental sustainability, economic and social issues. However, the design and
optimization of an effective groundwater remediation is rather complex, involving hydrogeological and
geotechnical properties of the polluted aquifer, pollutant properties and costs evaluation. Among the in-
situ groundwater treatments, Permeable Adsorptive Barriers (PABs) are a suitable technology, assuring
both groundwater remediation and cost effectiveness. PABs consist in a trench penetrating the aquifer and
filled of reactive material, whose hydraulic conductivity is higher than that of the surrounding soils, so
that the contaminated plume moves under natural hydraulic gradient and it is passively treated without
external energy inputs [1]. Furthermore, PABs allow to achieve high efficiency and relatively low
operating and maintenance costs in the long term period and allow the productive use of the site almost
immediately after installation [2]. Clogging phenomena due to salt precipitation are the main
disadvantage of PRBs [3].