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Life Cycle Assessment of Biogas from Separated slurry
Table 6.4. Comparison of the impacts from Scenario A (reference) versus Scenario H (biogas from raw pig slurry + fibre fraction from mechanical separation). The number of digits is not an expression of the uncertainty.
| Impact category |
Scenario A
- pig |
Scenario H |
Difference, i.e.
Biogas scenario H minus
Reference scenario A |
Conclusion |
| Global warming (during 10 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+284 kg
- 36 kg
= 248 kg |
+ 271 kg
- 59 kg
= 211 kg |
-37 [-55 to -18] kg CO2 eq. |
6-19% 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 |
+ 293 kg
- 72 kg
= 220 kg |
-37 [-55 to -19] kg CO2 eq. |
6-18% 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 |
+ 45.5 m²
-6.9 m²
= 38.5 m² |
-6.2 [-16 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 |
+ 1.49 kg
- 0.97 kg
= 0.52 kg |
-0.06 [-0.19 to +0.06] 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 |
+ 1.65 kg
- 1.11 kg
= 0.53 kg |
-0.07 [-0.22 to +0.07] 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
= -0.0018 kg |
-0.0001 [-0.0004 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 |
+ 0.17 p.p.h
-0.02 p.p.h = 0.15 p.p.h |
-0.012 [-0.036 to +0.012] 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 |
+ 0.27 kg
- 0.06 kg
= 0.21 kg |
-0.028
[-0.084 to +0.028] 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 |
+ 194 MJ
-677 MJ = -483 MJ |
-270 [-350 to -190] MJ |
125-230% 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 [-0.026 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 |
+ 27.6 kg C
- 24.1 kg C
= 3.5 kg C
= 12.7 kg CO2 |
-0.14 [-1.2 to +0.9 ] kg C
-0.5 [ -4.5 to +3.5] 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: |
+ 31.7 kg C
-30.7 kg C
= 1.0 kg C = 3.8 kg CO2 |
+ 27.6 kg C
- 27 kg C
= 0.64 kg C = 2.4 kg CO2 |
-0.14 [-1.2 to +0.9 ] kg C
-0.5 [ -4.5 to +3.5] 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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