Environmental Engineering Reference
In-Depth Information
8.1 Louisiana PRBs
Activities at the Louisiana battery recycling facility site included spent lead-
acid battery demolition and lead smelting of battery lead plates to produce
lead ingots. Initial remedial action at the site included excavation, treatment,
and off-site disposal of approximately 32,400 cubic meters of impacted soils.
A large low pH, high acidity, metal-laden groundwater plume remained on
site and continued to discharge into a nearby creek. A full-scale PRB, con-
sisting of 67% composted cow manure (v/v) and 33% limestone gravel, was
installed at the site (by others) in May 2003 to intercept and treat the ground-
water plume prior to entry of the groundwater into the creek (Figure 8.1). The
dimensions of the PRB are 1.8 m wide, 4-5 m deep, and over 300 m in length.
Prior to installation of the full-scale PRB, two pilot-scale PRBs were installed
to evaluate two candidate organic carbon-limestone matrices. One pilot PRB
consisted of the 67/33 cow manure/limestone mixture that was ultimately
used in the full-scale PRB, while the other consisted of a 33/33/33 mixture of
cow manure, wood chips, and limestone gravel.
Each of the two pilot PRBs measured 1.8 m wide, 4.3 m deep, and 30 m
in length. The pilot PRBs and the full-scale PRB were monitored for 7 years
with chemical monitoring being conducted annually. One transect through
each of the two pilot PRBs and several transects through the full-scale PRB
were monitored. The discussion presented herein focuses on the two pilot
Creek
TEPA-1
TEPA-2
TEPA-5
TEPA-6
H
9.0 m
G
4.5 m
Pilot PRB 2 (cow manure + limestone)
F
1.5 m
E
0.6 m
D
C
1.8 m
PRB
Pilot PRB 1 (cow manure + wood
chips + limestone)
2.5 m
Full-scale PRB (cow manure + limestone)
4.3 m
B
1.8 m
Groundwater flow
A
FIGURE 8.1
Schematic of PRB systems and transect configurations at Louisiana site.
Search WWH ::
Custom Search