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Dissolved metal adsorption capacities and fractionation in filter materials for use in stormwater bioretention facilities
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Departments of Food, Agricultural, and Biological Engineering and Civil, Environmental, and Geodetic Engineering, Ohio State University, 590 Woody Hayes Drive, Columbus, OH, United States of America.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-1725-6478
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-5548-4397
2019 (English)In: Water Research X, ISSN 2589-9147, Vol. 4, article id 100032Article in journal (Refereed) Published
Abstract [en]

The dissolved metal adsorption and association was determined for ten different filter materials recommended and/or implemented in bioretention facilities. Batch adsorption and batch kinetic experiments were performed at lab-scale using both single and multi-metal solutions. Metal strengths and association were determined by sequential extraction analysis. All materials adsorbed metals and 90% of adsorption occurred within 1 h. However, as metal solutions became more complex, adsorption behavior changed. Generally, filter materials classified as sand with a naturally high pH, relatively low organic matter (OM) content and large specific surface area seem to be good choices for removing dissolved metals. Additionally, a chalk additive might improve metal adsorption whereas biochar did not significantly improve metal retention and may be an unwanted (due to degradation over time) extra source of OM. Regardless of filter material, metals primarily adsorbed to the exchangeable form which indicates that metal adsorption might not be permanent, but rather substantially reversible in some cases. More research is needed to assess whether dissolved metals adsorbed in filter materials of bioretention systems pose a delayed threat instead of an immediate threat. Finally, the authors strongly recommend filter materials intended for stormwater bioretention facilities to be tested prior to implementation.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 4, article id 100032
Keywords [en]
Filter material, Biofilter, Heavy metals, Metal fractionation, Filter media
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73666DOI: 10.1016/j.wroa.2019.100032PubMedID: 31334495Scopus ID: 2-s2.0-85065547443OAI: oai:DiVA.org:ltu-73666DiVA, id: diva2:1305119
Note

Validerad;2019;Nivå 2;2019-06-25 (johcin)

Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-08-22Bibliographically approved
In thesis
1. Bioretention for stormwater quality treatment: Effects of design features and ambient conditions
Open this publication in new window or tab >>Bioretention for stormwater quality treatment: Effects of design features and ambient conditions
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Biofilter för dagvattenrening : design och omgivningspåverkan
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73669 (URN)978-91-7790-362-8 (ISBN)978-91-7790-363-5 (ISBN)
Public defence
2019-05-29, C305, 10:00 (English)
Opponent
Supervisors
Available from: 2019-04-16 Created: 2019-04-15 Last updated: 2019-06-05Bibliographically approved

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Søberg, LailaViklander, MariaBlecken, Godecke-Tobias

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