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Improving the life cycle impact assessment of metal ecotoxicity: Importance of chromium speciation, water chemistry, and metal release
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2100-8864
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2019 (English)In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 11, no 6, article id 1655Article in journal (Refereed) Published
Abstract [en]

Investigations of metal ecotoxicity in life cycle assessment (LCA) and life cycle impact assessment (LCIA) are becoming important tools for evaluating the environmental impact of a product or process. There is, however, improvement needed for LCIA of metal ecotoxicity in order to make this assessment more relevant and robust. In this work, three issues within the LCIA of metal ecotoxicity are investigated, mainly focusing on topics related to stainless steel manufacturing. The first issue is the importance of considering regional water chemistry when constructing the characterization factor (CF). A model freshwater of relevance for stainless steel manufacturing in a region of Sweden was created with chemistry different from available options. The second issue is related to the lack of consideration on changes in speciation of Cr(VI) in freshwater for a given emission, as Cr(VI) to some extent will be reduced to Cr(III). Two new options are suggested based on relationships between the Cr(VI)-total Cr ratio as a way to improve the relevancy of LCIA for Cr(VI) in freshwater. The last issue is how to treat metal release from slags in LCIA. Metal release from slags was shown to vary significantly between different ways of modelling slag emissions (differences in total metal content, slag leaching tests, estimated emissions to groundwater). 

Place, publisher, year, edition, pages
MDPI AG , 2019. Vol. 11, no 6, article id 1655
Keywords [en]
Chromium, Chromium(VI), Ecotoxicity, Life cycle assessment, Life cycle impact assessment, Metal release, Nickel, Slag, Stainless steel, USEtox
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-252241DOI: 10.3390/su11061655ISI: 000465613000110Scopus ID: 2-s2.0-85063495702OAI: oai:DiVA.org:kth-252241DiVA, id: diva2:1323506
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QC20190612

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12Bibliographically approved

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Hedberg, JonasPrideaux, SonjaOdnevall Wallinder, Inger

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