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Environmental impact of recycling digested food waste as a fertilizer in agriculture: A case study
SLU Swedish University of Agricultural Sciences, Sweden.
SLU Swedish University of Agricultural Sciences, Sweden.
RISE., SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
SLU Swedish University of Agricultural Sciences, Sweden.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 95, s. 1-14Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study assessed the environmental impacts of recycling the plant nutrients in anaerobically digested food waste as fertilizer in agriculture. This was compared with the impacts of using chemical fertilizer, where the food waste was incinerated, producing heat. The study site was a biogas plant in central Sweden and life cycle assessment methodology was used. The impacts studied were primary energy use, global warming potential (GWP), potential acidification, potential eutrophication, cadmium flow to farmland and use of phosphate rock. Use of digested food waste as fertilizer proved to have larger negative results than use of chemical fertilizer in all categories assessed except use of non-renewable phosphate rock. Sensitivity analyses showed that the scenarios were comparable in terms of primary energy use and better for GWP if some improvements in the anaerobic digestion system were made. However, acidification and eutrophication caused by digestate handling and the cadmium content of digestate should still be considered.

sted, utgiver, år, opplag, sider
2015. Vol. 95, s. 1-14
Emneord [en]
Biogas production, LCA, Digestate, Fertilizer, Food waste treatment
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-2393DOI: 10.1016/j.resconrec.2014.11.015Scopus ID: 2-s2.0-84920176640OAI: oai:DiVA.org:ri-2393DiVA, id: diva2:959982
Tilgjengelig fra: 2016-09-07 Laget: 2016-09-07 Sist oppdatert: 2019-07-03bibliografisk kontrollert

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