Permeable Reactive Barriers
Permeable reactive barriers (PRBs) are passive ground water treatment systems constructed by backfilling biopolymer trenches with select treatment media to break down or capture chlorinated solvents in the groundwater. Backfill media may include organic additives for bioremediation or other reagent mixtures (e.g. zero-valent iron or activated carbon).
Funnel and gate systems involve the construction of two or more impermeable barrier walls (the funnel) to direct contaminated groundwater to a “gate” comprised of the treatment media. The advantage of these systems is that they operate passively, with no infrastructure (pipes, pumps, etc). but the efficacy of the treatment can be still be monitored, and the media replaced as necessary.