LCA Food 2012 in Saint Malo, France! - Manifestations et colloques ...

PARALLEL SESSION 6C: POULTRY AND PORK PRODUCTION SYSTEMS 8 th Int. Conference on LCA in the
Agri-Food Sector, 1-4 Oct 2012
analysis is calculating the net model outputs if P loss rates are varied from 0% to 100% of P surplus. The
model with 100% loss of P surplus, is more than 1 order of magnitude larger than the main model. The
model with 0% loss of P surplus leads to an emission of a freshwater eutrophication potential that is close to
0. The slightly negative values for the four scenarios with slurry separation, are due to losses during production
of mineral P fertiliser.
Table 4: Sensitivity of freshwater eutrophication potential to field P loss rates.
5% of P surplus 0% of P surplus 100% of P surplus
Baseline Scenario 0,022 0,000 0,445
Screw Press Scenario 0,017 -0,001 0,352
Screw Press + Composting 0,017 -0,001 0,352
Centrifuge Scenario -0,012 -0,003 -0,183
Centrifuge + Am Stripping 0,010 -0,003 0,253
4. Conclusion
In general, the treatment technologies analysed in this LCA show environmental impact potential reduction
in comparison to a reference scenario. The only scenario that seems to have a higher impact potential,
with respect to the global warming potential and acidification, is the scenario with screw press separation and
composting of the solid fraction. The decanter centrifuge scenarios show higher impact potential reductions
than the screw press scenarios. The sensitivity analysis shows that results are particularly sensitive to phosphorus
loss rates. For all variables included in the sensitivity analysis, relative scenario ranking does not
change.
5. Acknowledgements
The research was performed as a part of research project “CLEANWASTE” funded by The Danish
Council for Strategic Research.
6. References
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