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Sewage sludge as fertiliser - Environmental assessment of storage and land application options
SLU Swedish University of Agricultural Sciences, Sweden.
IVL Swedish Environmental Research Institute, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
SLU Swedish University of Agricultural Sciences, Sweden.
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2017 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 75, no 5, p. 1034-1050Article in journal (Refereed) Published
Abstract [en]

Sewage sludge (SS) contains beneficial plant nutrients and organic matter, and therefore application of SS on agricultural land helps close nutrient loops. However, spreading operations are restricted to certain seasons and hence the SS needs to be stored. Storage and land application of SS are both potential sources of greenhouse gases and ammonia, leading to global warming, acidification and eutrophication. Covering the stored SS, treating it with urea and choosing the correct time for land application all have the potential to reduce emissions from the system. Using life cycle assessment (LCA), this study compares storage and land application options of SS in terms of global warming potential (GWP), acidification potential, eutrophication potential and primary energy use. The system with covered storage has the lowest impact of all categories. Systems with autumn application are preferable to spring application for all impact categories but, when nitrate leaching is considered, spring application is preferable in terms of eutrophication and primary energy use and, for some SS treatments, GWP. Ammonia addition reduces nitrous oxide and ammonia emissions during storage, but increases these emissions after land application. Storage duration has a large impact on GWP, while amount of chemical nitrogen fertiliser substituted has a large impact on primary energy use.

Place, publisher, year, edition, pages
2017. Vol. 75, no 5, p. 1034-1050
Keyword [en]
Acidification, Biosolids, Eutrophication, GWP, LCA, Primary energy use
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-31009DOI: 10.2166/wst.2016.584Scopus ID: 2-s2.0-85018443091OAI: oai:DiVA.org:ri-31009DiVA: diva2:1137815
Available from: 2017-09-01 Created: 2017-09-01 Last updated: 2017-09-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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