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Life Cycle Assessment of Biogas from Separated slurry
Table 7.4. Comparison of the impacts from Scenario A (reference) versus Scenario I (biogas from raw pig slurry + fibre pellets). The number of digits is not an expression of the uncertainty.
| Impact category |
Scenario A
- pig |
Scenario I |
Difference, i.e.
Biogas scenario I minus
Reference scenario A |
Conclusion |
| Global warming (during 10 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+284 kg
- 36 kg
= 248 kg |
+ 285 kg
- 53 kg
= 233 kg |
-15 [-23 to -8] kg CO2 eq. |
3-8% reduction of
positive contributions
from scenario A |
| Global warming (during 100 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+ 304 kg
- 47 kg
= 257 kg |
+ 306 kg
- 65 kg
= 241 kg |
-16 [-24 to -8] kg CO2 eq. |
3-8% reduction of
positive contributions
from scenario A |
| Acidification [m² UES, i.e. area of unprotected ecosystem] |
Positive contributions:
Negative contributions:
Net: |
+ 50.3 m²
-5.5 m²
= 44.8 m² |
+ 46.0 m²
-6.5 m²
= 39.5 m² |
-5.3 [-13 to +3] 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: |
+ 1.51 kg
- 0.93 kg
= 0.59 kg |
+ 1.46 kg
- 0.96 kg
= 0.50 kg |
-0.08 [-0.25 to +0.08] 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: |
+ 1.63 kg
- 1.03 kg
= 0.61 kg |
+ 1.61 kg
- 1.09 kg
= 0.52 kg |
-0.09 [-0.28 to +0.09] kg N |
No significant
difference due to
uncertainties |
| P-eutrophication (aquatic) [kg P - amount reaching aquatic recipients] |
Positive contributions:
Negative contributions:
Net: |
+ 0.0069 kg
- 0.0086 kg
= -0.0017 kg |
+ 0.0069 kg
- 0.0087 kg
= -0.0017 kg |
-0.00007 [-0.0002 to 0.0001] kg P |
No significant
difference due to
uncertainties |
| Photochemical ozone formation [person.ppm.hr - see section 3.4.7] |
Positive contributions:
Negative contributions:
Net: |
+ 0.179 p.p.h
- 0.014 p.p.h = 0.17 p.p.h |
+ 0.19 p.p.h
-0.02 p.p.h = 0.17 p.p.h |
+0.005 [-0.005 to +0.015] 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: |
+ 0.29 kg
- 0.05 kg
= 0.24 kg |
+ 0.29 kg
- 0.06 kg
= 0.23 kg |
-0.009
[-0.028 to +0.009] kg PM2.5 |
No significant
difference due to
uncertainties |
| Non-renewable energy [MJ primary energy] |
Positive contributions:
Negative contributions:
Net: |
+ 151 MJ
-369 MJ = -217 MJ |
+ 336 MJ
-572 MJ = -236 MJ |
-19 [-13 to -24] MJ |
8-16% reduction of
positive contributions
from scenario A |
| Phosphorus Resources [kg P] |
Positive contributions:
Negative contributions:
Net: |
0 kg
- 1.34 kg
= -1.34 kg |
+ 0 kg
- 1.35 kg
= -1.35 kg |
-0.01 [-0.017 to 0) kg P |
No significant
difference due to
uncertainties |
| 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: |
+ 31.7 kg C
-28.1 kg C
= 3.6 kg C
= 13.2 kg CO2 |
+ 25.4 kg C
- 22.4 kg C
= 3.0 kg C
= 10.9 kg CO2 |
-0.63 [-1.7 to +0.5 ] kg C
-2.3 [ -6.3 to +1.7] 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: |
+ 31.7 kg C
-30.7 kg C
= 1.0 kg C = 3.8 kg CO2 |
+ 25.4 kg C
- 24.9 kg C
= 0.5 kg C
= 1.9 kg CO2 |
-0.52 [-0.9 to +0.2 ] kg C
-1.9 [ -3.2 to +0.8] kg CO2 |
No significant
difference due to
uncertainties |
Note: All numbers are all rounded and accordingly, if the reader calculates the difference, it might vary slightly from the numbers shown in the table.
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Version 1.0 August 2010, © Danish Environmental Protection Agency
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