Environmental Engineering Reference
In-Depth Information
Several successful laboratory and field tests, using DC electrical cur-
rents to introduce bacteria and nutrients into fine-grained sediments were
conducted at the University of Southern California (Chilingar et al., 1997).
The process, termed “Electro-Bio-Remediation”, utilized DC electrical cur-
rents to force bacteria and nutrients into these very low permeability soils
and rocks to remediate light hydrocarbon (gasoline and diesel) contamina-
tion from spills.
3.12.2 Sulfur Sequestration
The dramatic Santa Maria Basin H 2 S reduction, during DCEOR, raised
questions as to whether these results were due to preferential production,
or actual sulfur sequestration. Table 3.8 summarizes some preliminary lab-
oratory results, which suggest that DCEOR moves sulfur from the hydro-
carbons to the brines, in-situ .
3.12.3
Carbonate Reservoir Laboratory Tests
An earlier discussion (above) indicated that carbonate reservoirs, because
they tend to be preferentially non-water wet, might behave differently than
Table 3.8 Laboratory evaluation of DCEOR sulfur sequestration studies (after
Wittle, 2007)
Oil System
Sample
Initial %
Sulfur in
Oil
Initial %
Sulfur in
Electrolyte
Final %
Sulfur in
Oil
Final %
Sulfur in
Electrolyte
Thriophene in
Mineral Oil
1.24
0.00
0.20
2.96
Thriophene in
Mineral Oil
1.33
0.01
0.15
1.31
Thriophene in
Mineral Oil
2.71
0.00
0.30
1.50
Thrianapthalene
in Mineral Oil
3.77
0.00
5.23
0.80
Thrianapthalene
in Mineral Oil
6.17
0.07
4.90
0.64
Crude Oil
6.13
0.00
4.57
0.80
Crude Oil
6.13
0.00
4.57
0.80
 
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