Environmental Engineering Reference
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-15
NH
4
-N
mg/L
-20
Horizons
OP: 0-10 m
-15
MP1: 10-20 m
MP2: 20-30 m
MP3: 30-40 m
UP: 40-50 m
-25
-20
30
25
20
15
10
5
0
-30
-25
-35
-30
-35
FIGURE 10.15
Results of ammonium degradation after 3 years of BIOXWAND operation.
10.4.2 Oxygen Gas PRB for Risk Coverage of MNA of an Organic
Contaminant Plume
An unconfined aquifer in the vicinity of a former lignite processing site was
impacted by organic pollutants (aliphatic, aromatic) and a 600 m long con-
tamination plume had formed. Restoration of the site is conducted by a fed-
eral administration company specialized in postmining sites (the Lausitzer
und Mitteldeutsche Bergbau-Verwaltungsgesellschaft mbH [LMBV]) under
the supervision of the mining authority. Following a pump-and-treat decon-
tamination, the Profen site was treated by monitored natural attenuation
(MNA). The risk prognosis of the plume behavior was based on delineation
of the damaged aquifer region, groundwater flow analysis and prediction,
balancing of inventory and mass flow rates of contaminants, and identifi-
cation of biodegradation processes. The results of the MNA showed that
contaminant concentrations were reduced.
A primary protection goal was the prevention of contaminated ground-
water impacts from the downstream active lignite mining. The groundwater
flow is controlled by mining area drainage and a postmining pit lake. In
this way, the cooperation with the mining company was needed in order to
ensure an efficient long-term site restoration (Giese et al., 2012).
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