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Life Cycle Assessment of Biogas from Separated slurry
Table 5.5. Comparison of the impacts from Scenario A (reference) versus Scenario G (biogas from raw cow slurry + fibre fraction from chemical-mechanical separation). The number of digits is not an expression of the uncertainty.
| Impact category |
Scenario A
- dairy cow |
Scenario G |
Difference, i.e.
Biogas scenario G minus
Reference scenario A |
Conclusion |
| Global warming (during 10 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+ 326 kg
- 40 kg
= 286 kg |
+ 302 kg
- 123 kg
= 179 kg |
-107 [-159 to -82] kg CO2 eq. |
25-49% reduction of
positive contributions
from scenario A |
| Global warming (during 100 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+ 355 kg
- 51 kg
= 304 kg |
+ 331 kg
- 136 kg
= 195 kg |
-150 [-224 to -116] kg CO2 eq. |
33-63% reduction of
positive contributions
from scenario A |
| Acidification [m² UES, i.e. area of unprotected ecosystem] |
Positive contributions:
Negative contributions:
Net: |
+ 43.3 m²
-5.9 m²
= 37.3 m² |
+ 45.9 m²
-10.9 m²
= 35.0 m² |
-2.4 [-10 to +2] m² UES |
No significant
difference due to
uncertainties |
| N-eutrophication (aquatic) (during 10 years) [kg N - amount reaching aquatic recipients] |
Positive contributions:
Negative contributions:
Net: |
+ 1.55 kg
- 1.00 kg
= 0.55 kg |
+ 1.58 kg
- 1.07 kg
= 0.51 kg |
-0.04 [-0.09 to +0.004] kg N |
No significant
difference due to
uncertainties |
| N-eutrophication (aquatic) (during 100 years) [kg N - amount reaching aquatic recipients] |
Positive contributions:
Negative contributions:
Net: |
+ 1.79 kg
- 1.11 kg
= 0.68 kg |
+ 1.85 kg
- 1.21 kg
= 0.64 kg |
-0.15 [-0.32 to +0.015] kg N |
No significant
difference due to
uncertainties |
| P-eutrophication (aquatic) [kg P - amount reaching aquatic recipients] |
Positive contributions:
Negative contributions:
Net: |
+ 0.0063 kg
- 0.0089 kg
= -0.0026 |
+ 0.0063 kg
- 0.0099 kg
= -0.0035 |
-0.0009 [-0.0005 to -0.0019] kg P |
8-30% reduction of
positive contributions
from scenario A |
| Photochemical ozone formation [person.ppm.hr - see section 3.4.7] |
Positive contributions:
Negative contributions:
Net: |
+ 0.16 p.p.h
-0.02 p.p.h
= 0.14 p.p.h |
+ 0.18 p.p.h
-0.04 p.p.h
= 0.14 p.p.h |
-0.006 [-0.023 to +0.011] p.p.h |
No significant
difference due to
uncertainties |
| Respiratory Inorganics [kg PM2.5 eq, i.e. kg equivalents of 2.5 µm size particles] |
Positive contributions:
Negative contributions:
Net: |
+ 0.25 kg
- 0.05 kg
= 0.20 kg |
+ 0.29 kg
- 0.09 kg
= 0.20 kg |
-0.003
[-0.030 to +0.0.028] kg PM2.5 |
No significant
difference due to
uncertainties |
| Non-renewable energy [MJ primary energy] |
Positive contributions:
Negative contributions:
Net: |
+ 131 MJ
-410 MJ
= -279 MJ |
+ 250 MJ
-1475 MJ
= -1225 MJ |
-946 [-1230 to -662] MJ |
500-930% reduction of
positive contributions
from scenario
A |
| Phosphorus Resources [kg P] |
Positive contributions:
Negative contributions:
Net: |
+ 0 kg
- 1.38 kg
= -1.38 kg |
+ 0 kg
- 1.51 kg
= -1.51 kg |
-0.13 [-0.26 to -0.0.066) kg P |
A significantly larger
amount of P resources
saved in scenario
G |
| Carbon stored in soil during 10 years [kg C] and corresponding amount of CO2-eq |
C added with slurry:
C lost as CO2:
C stored in soil:
Net CO2: |
+ 47.2 kg C
- 40.2 kg C
= 7.0 kg C = 25.5 kg CO2 |
+33.1 kg C
- 27.0 kg C
= 6.1 kg C
= 22.3 kg CO2 |
-0.86 [-2.9 to +1.2 ] kg C
-0.32 [ -10.8 to +4.5] kg CO2 |
No significant
difference due to
uncertainties |
| Carbon stored in soil during 100 years [kg C] and corresponding amount of CO2-eq |
C added with slurry:
C lost as CO2:
C stored in soil:
Net CO2: |
+ 47.2 kg C
- 45.2 kg C
= 2.0 kg C
= 7.3 kg CO2 |
+ 33.1 kg C
- 31.4 kg C
= 1.7 kg C
= 6.2 kg CO2 |
-0.3 [-0.9 to +0.3] kg C
-0.1.1 [ -3.4 to +1.1] kg CO2 |
No significant
difference due to
uncertainties |
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Version 1.0 August 2010, © Danish Environmental Protection Agency
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