 Pollutants dissolved in groundwater precipitate out as solid particles when they react
with the reactive material in the wall.
 Pollutants react with the reactive substance to create less dangerous contaminants.
 Microbes in the reactive media decompose contaminants.
Advantages of PBR
 Treats broad spectrum of contaminants (organics, inorganics, radionuclides)
 Require low energy
 Low operational and maintenance cost
 Effective for long time
 No loss of groundwater
Disadvantages and limitations of PBR
 Large rocks below ground surface
 Existing infrastructures
 Performance may decrease over time due to befouling and reduction in permeability
 Complex process for monitoring and cleanup
Comparison of PBR with extraction and disposal method
Table 1: PBR VS extraction and disposal method
PRBs Extraction and Disposal
Permeable Reactive Barriers is a water
treatment approach for the management of
contaminated groundwater. The basic concept
of this remediation approach is to dig a trench
with fillers of permeable reactive materials in
the flow way of contaminated groundwater
(Snow, 1999).
The extraction and disposal or pump and treat
method is a traditional approach to address
contaminated groundwater to extract it from
the aquifer by well, treat it in the treatment
plant, and then a part of it is reinjected into
the ground and the other is disposed off-site
(Bradl & Xenidis, 2005).
With the flow of contaminated groundwater
through the reactive media, the active material
interacts with the contamination in the water
An area with contaminated source of water is
isolated with low permeability barriers or
covers to prevent the migration of pollutants,
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Permeable Reactive Barrier Method 2 Introduction Introduction 2 Advantages and Limitations

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