Environmental Engineering Reference
In-Depth Information
from a simple clearing of clogged sections to a full replacement of the reac-
tive medium (particularly recommended for barriers that use the adsorp-
tion principle). For example, the French company Soletanche-Bachy uses a
patented prefabricated three-chamber system that is inserted into a shaft or
vault/cell. Its two lateral chambers are filled with gravel to passively guide/
manipulate the natural groundwater flow and also permit access to the reac-
tive material, which is usually placed in the middle chamber (Figure 13.3). A
PRB in Amersfoort, the Netherlands, is an EC-PRB, which passively collects
the groundwater through a cutoff wall, and discharges it by means of a pipe
Waterlight wall
Natural water table
Polluted area
Downstream
drainage element
Waterlight layer
Bank of filters with
removable cartridges
(1, 2 or 3, ...)
Upstream-harnessing
drainage element
FIGURE 13.3
Panel-drain principle. (Courtesy by Soletanche-Bachy, Solenvironment, Paris, France.)
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