Environmental Engineering Reference
In-Depth Information
Optical system
Gravimetrical system
Overflow system
Scale
CCD cameras
p
e
Presparging
column
Gas supply
Lead beads
Plexiglas
tank
Air
Porous medium
Q
g
FIGURE 10.3
Test devices and sites for DGI studies. Upper left: gravimetric-optical system. (Geistlinger et
al. 2006: Direct Gas Injection into glass beads: Transition from incoherent to coherent gas flow
pattern.
Water Res. Research
, 42, paper W07403, 12 p.) Upper right: pressurized rotatable column
with gravimetric balancing system, bottom image: field-scale test site BIOXWAND.
pore to local scale phenomena (10
−5
-10
−1
m). Uniform sand fractions and glass
beads were used as sediments and effective mechanical stress is induced by
hydraulic pressure being applied to a rear-side membrane and an overbur-
den or gravimetric load (leaden spheres). A gravimetric phase balancing sys-
tem was installed for saturation measurements.
A
bench to pilot scale
research test site for gas-based remediation techniques
was installed at the Dresden Groundwater Centre (Figure 10.3). Test col-
umns and tanks (0.3 m-3.0 m in diameter) were used to evaluate the effec-
tive parameters for gas injection, storage, and dissolution for upscaling to
field applications (Weber, 2007). The test devices operated under near-to-field
conditions. 1D and 3D total stress and system pressures of 300 kPa (using
a 20 m column of water) were applied to the columns and tanks. The tem-
perature of the system was set at 10-15°C, which are temperatures typical
Search WWH ::
Custom Search