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Chemical extraction of trace elements from dredged sediments into a circular economy perspective: Case study on Malmfjärden Bay, south-eastern Sweden
Linnéuniversitetet, Institutionen för biologi och miljö (BOM).ORCID iD: 0000-0002-0367-5332
Malmö University, Sweden.ORCID iD: 0000-0001-8906-9271
Linnéuniversitetet, Institutionen för biologi och miljö (BOM).ORCID iD: 0000-0002-1903-760X
2021 (English)In: Resources, Environment and Sustainability, E-ISSN 2666-9161, Vol. 6, article id 100039Article in journal (Refereed) Published
Abstract [en]

Worldwide, sediments are dredged from water bodies to guarantee proper water levels and remediate aquatic ecosystems. Dredged sediments contain metals that could interfere with recycling if the concentrations overpass permissible limits. Washing of elements from sediments represents a technique to decrease the concentration of metals, and it could introduce a new source of elements. The current study aimed to employ ethylenediamine-tetraacetic acid (EDTA) and ethylenediamine-disuccinic acid (EDDS) and investigate the effect of operational parameters (concentration and pH) on the chemical extraction of metals from dredged sediments. Core sediments were extracted from sampling stations around Malmfjärden bay, Sweden. The results suggested that lead, zinc and copper were the elements with higher extraction rates, followed by arsenic and nickel. Chromium was poorly extracted. EDTA was more efficient than EDDS in dissolving the elements. Moreover, acidic conditions offered higher extraction rates for As using both chelators and for Pb employing EDTA. The 0.05 M concentration presented a higher mean extraction rate than 0.01 M for Cu, Cr and Ni for EDTA and EDDS. The findings in this study suggest that sediment washing is a promising technique to decrease metal concentrations in sediments and enhancing the feasibility to use the material for beneficial uses.

Place, publisher, year, edition, pages
Elsevier , 2021. Vol. 6, article id 100039
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:mdh:diva-57920DOI: 10.1016/j.resenv.2021.100039Scopus ID: 2-s2.0-85117382443Local ID: 2021OAI: oai:DiVA.org:mdh-57920DiVA, id: diva2:1651750
Funder
Swedish Agency for Marine and Water ManagementAvailable from: 2022-04-13 Created: 2022-04-13 Last updated: 2022-04-13Bibliographically approved

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Ferrans, LauraJani, YahyaHogland, William

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