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Life Cycle Assessment of Biogas from Separated slurry
Table 4.5. Comparison of the impacts from Scenario A (reference) versus Scenario F (biogas from raw pig slurry + fibre fraction from chemical-mechanical separation). The number of digits is not an expression of the uncertainty.
| Impact category |
Scenario A
- pig |
Scenario F |
Difference, i.e.
Biogas scenario F minus
Reference scenario A |
Conclusion |
| Global warming (during 10 years) [kg CO2 eq.] |
Positive contributions:
Negative contributions:
Net: |
+284 kg
- 36 kg
= 248 kg |
+ 253 kg
- 109 kg
= 144 kg |
-103 [-154 to -80] kg CO2 eq. |
28-54% 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 |
+ 274 kg
- 120 kg
= 154 kg |
-104 [-154 to -80] kg CO2 eq. |
26-51% 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 |
+ 51.6 m²
-10.2 m²
= 41.4 m² |
-3.4 [-14 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 |
+ 1.47 kg
- 0.99 kg
= 0.48 kg |
-0.11 [-0.23 to +0.11] 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 |
+ 1.64 kg
- 1.11 kg
= 0.53 kg |
-0.08 [-0.16 to +0.01] 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
- 0.0108 kg
= -0.0039 |
-0.0022 [-0.0044 to -0.0011] kg P |
16-64% reduction of
positive contributions
from scenario A |
| 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 |
+ 0.18 p.p.h
-0.03 p.p.h = 0.15 p.p.h |
-0.018 [-0.068 to +0.032] 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 |
+ 0.32 kg
- 0.09 kg
= 0.23 kg |
-0.0041
[-0.043 to +0.046] 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 |
+ 237 MJ
-1288 MJ = -1051 MJ |
-834 [-1084 to -584] MJ |
380-710% 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
- 1.67 kg
= -1.67 kg |
-0.33 [-0.66 to -0.15) kg P |
A significantly larger
amount of P resources
saved in scenario
F |
| 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 |
+ 19.5 kg C
-16.1 kg C
= 3.4 kg C
= 12.3 kg CO2 |
-0.25 [-1.3 to +0.8 ] kg C
-0.9 [ -4.9 to +3.0] 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 |
+ 19.5 kg C
-18.5 kg C
= 0.94 kg C
= 3.4 kg CO2 |
-0.1 [-0.4 to +0.2] kg C
-0.3 [ -1.6 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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