Permeable reactive barriers
A permeable reactive barrier or PRB is an in situ construction 
that allows groundwater to pass through it, but removes
or destroys contaminants in the groundwater as it passes
through or in the vicinity of the barrier.
Permeable reactive barriers are chosen depending on the 
kind of contaminant found in a site. There are:

1) Sorption barriers which contain filling that remove
contaminants from groundwater by physically grabbing
the contaminants out of the water matrix and holding them
on the barrier surface, with zeolites or activated carbon


2) Precipitation barriers which contain fillings that
react with contaminants in ground water
3) Degradation barriers which degrade the contaminants
into harmless products
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