Biomedical Engineering Reference
In-Depth Information
90
M3-10
M5-15
80
M1-9
M3-9
M5-14
Control cell
M3-8
M4-12
M1-8
M2-8
M5-13
70
M1-7 M2-7
M3-7
M4-11
M5-12
60
M5-11
M4-10
M5-10
50
M1-6 M2-6
M3-6
M4-9
M5-9
40
Oxygen + MC-100
test cell
M1-5 M2-5
M3-5
M4-8
M5-8
M5-7
M1-4 M2-4
M3-4
M4-7
30
(Bioaugmentation with
a mixed culture)
M4-6
M5-6
M4-5
M5-5
20
M1-3 M2-3
M3-3
M4-4
M5-4
Oxygen-only
test cell
(biostimulation)
10
M3-2
M4-3
M5-3
M1-2 M2-2
M4-2
M1-1 M2-1
M3-1
M5-2
0
M4-1
M5-1
0
10
20
30
40
50
M= Monitoring well
= Oxygen injection point
= MC-100 injection point
Figure 10.3. Plot plan of MTBE bioaugmentation and biostimulation plots (modified from Salanitro
et al.,
1999
).
inch (psi). The point was lifted in 1-ft increments, with 5 gallons (20 L) of inoculum injected at
each interval, to the top of the aquifer (9 ft [3.5 m] bgs). Injection points were spaced a foot
apart over 21 locations installed transverse to the understood direction of groundwater flow.
Figure
10.4
illustrates the MTBE distribution in shallow test cells as a series of snapshots
before (up to 94 days before) and after (up to 1,007 days after) the bioaugmentation event.
The average MTBE concentration in the shallow aquifer prior to remediation was just over
5 mg-MTBE/L-groundwater. Concentrations in the downgradient wells fell to
<
5
g/L
(the laboratory detection limit) within 2 months in the bioaugmentation test cell. In the
m
Search WWH ::
Custom Search