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Fathollahzadeh, Homayoun, 2013. Speciation of metals in contaminated sediments in the Kalmar County, Sweden : an initial approach toward sediment mining. Second cycle, A2E. Uppsala: SLU, Dept. of Aquatic Sciences and Assessment

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Abstract

In response to the growing numbers of contaminated sites, concerns about proper management with reduced environmental footprints have been raised. In the present study, mining of highly contaminated sediments to recover valuable elements such as metals and nutrients is proposed as sustainable approach, both through enhancing resilience of ecosystems and remediation, beside probable turnovers. Thereby, in order to evaluate feasibility of metal recovery, fractionation of thirteen heavy and trace metals (Fe, Al, As, Ba, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Zn) in Oskarshamn harbor and Malmfjärden semi-enclosed bay surface sediments taken from five polluted locations in Kalmar County in southeast of Sweden was studied. The dissolution experiment by a modified BCR (Community Bureau of Reference, now SM&T) sequential extraction procedure (BCR-SEP) was used to determine the partitioning of elements. Oskarshamn and Malmfjärden sediments showed highest mobility for Zn and Cd, which can be leached out easily by small changes in environment conditions, whereas Al, Ba, and Hg in both sites, beside Cr and Fe in Malmfjärden exhibited high percentage in residual fraction. Moreover, total digestion results turn out that Oskarshamn in comparing to Malmfjärden sediments tended to result in larger contents of total extractable heavy metals (except Al), which is strongly attributed to factories, wastewater treatment plants, and ships traffic in Oskarshamn basin and diffusive sources in Malmfjärden. Despite the smaller magnitude of pollution in Malmfjärden relative to Oskarshamn, besides dredging and removal of sediments, in situ remediation techniques such as capping, using amendments and phytoremediation could be suggested. The results indicated that among different metals in the sediments, particularly in Oskarshamn, Cu and Pb followed by As, Cr and Ni can be considered for future sediment mining.

Main title:Speciation of metals in contaminated sediments in the Kalmar County, Sweden
Subtitle:an initial approach toward sediment mining
Authors:Fathollahzadeh, Homayoun
Supervisor:Huser, Brian and Hogland, William
Examiner:Köhler, Stephan
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2013
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM010 Soil and Water Management - Master's Programme 120 HEC
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Keywords:Sediment mining, harbor, semi-enclosed bay, speciation, metals, sequential extraction procedure, recovery, sustainable, environmental footprint, environmental assessment
URN:NBN:urn:nbn:se:slu:epsilon-s-2097
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-2097
Subjects:Water resources and management
Soil science and management
Soil chemistry and physics
Chemistry
Language:English
Deposited On:12 Mar 2013 11:19
Metadata Last Modified:12 Mar 2013 11:19

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