Among all the so-called "passive" techniques for treating/restoring surface groundwater, Reactive Permeable Barriers (RPBs) are attracting a great deal of interest, but are also raising many questions. This is why, after a 1st "general" review of the state of the art on PRBs in 2004, RECORD has decided to delve deeper into the subject by looking at the prospects for these techniques in the treatment of metal pollution. This work provides a detailed analysis of the latest research work, site trials and feedback from industrial experience. This analysis has led to the identification of the main barriers and obstacles that explain the low level of industrial development. The study concludes with proposals for research directions that should lead to developments in this field.
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