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44                          Life Cycle Assessment of Wastewater Treatment


                                             Biological reactor
                  Concentration
                                            ELAN
                             A-stage
                                                     IFAS
                       UASB

                       st
                      1  stage                          Sludge management
                                                  Sludge pre-       AD
                                                   treatment

                                ELAN+
                                struvite
                                         SCENA



           FIGURE 3.5  PIONEER_STP layout.


           3.7  CONCLUSIONS

           This chapter has delved into the main environmental findings that have been reported
           in the literature in the analysis of wastewater treatment technologies by life cycle
           perspective methodologies. LCA has been shown to be a key environmental method-
           ology to identify key hotspots in the analysis of wastewater treatment technologies
           and provide extensive information to define criteria and establish priorities in the
           selection of technologies for wastewater treatment.


           ACKNOWLEDGEMENTS
           This research has been supported by the EU project (PIONEER_STP). The authors
           belong to the Galician Competitive Research Group GRC 2013-032, program co-
           funded by FEDER: Fondo Europeo de Desarrollo Regional, as well as to CRETUS
           (AGRUP2015/02)

           REFERENCES

           Ahn, J., Kim, S., Park, H., Rahm, B., Pagilla, K., and Chandran, K., 2010. N 2 O emissions
                from activated sludge processes, 2008–2009: Results of a National Monitoring Survey
                in the United States. Environmental Science and Technology 44, 4505–4511.
            Alfonsín, C., Hospido, A., Omil, F., Moreira, M.T., and Feijoo, G., 2014. PPCPs in waste-
                water—Update and calculation of characterization factors for their inclusion in LCA
                studies. Journal of Cleaner Production 83, 245–255.
            Bauman, H. and Tillman, A.-M., 2004. The Hitch Hiker’s Guide to LCA. Studentlitteratur
                AB, Lund (Sweden).
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