II. ENVIRONMENTAL IMPACTS AND RISKS EVALUATION OF OFFSHORE DRILLING
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67
Figure 29: Damage scores related to the treatments of offshore drilling waste
Table 9: Damage scores of the drilling waste treatments expressed in specific units
II.3.9
Terrestrial ecotoxicity scores of toxic substances emitted from drilling waste
treatment
The graph in the figure shows the dominant substances that have a potential terrestrial
ecotoxicity impact to which the microbial biodiversity of the soils of the region may be exposed.
These soils are the receiving environments for the pollutants that can be emitted during the
treatment processes as well as from the surface deposition of the treated cuttings. These majority
substances are, in ascending order, cobalt, arsenic and chromium, especially through physical
treatment where the cuttings would still contain quantities of hydrocarbons and chemical
additives after treatment.
Units
Sieving+
Centrifugation
Solidification
Stabilization
Thermal desorption
Human health
DALY
1.00E+02
1.77E+00
-3.17E+00
Ecosystem Quality
PDF*m2*yr
1.00E+02
1.14E-01
-1.27E-01
Climate Change
Kg CO2 eq
9.35E-03
1.00E+02
-8.52E+01
Resources
MJ Primary
0.00E+00
6.43E+01
-1.00E+02
-100
-80
-60
-40
-20
0
20
40
60
80
100
Physical treatment by
Centrifugation
Solidification Stabilization
Thermal desorption
Human health
Ecosystem Quality
Climate Change
Resources