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Reduced bioaccumulation of PCBs and PAHs by sediment fauna following in situ remediation with activated carbon in Trondheim Harbor (Norway)
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. (Marine Ecotoxicology)
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Norwegian Geotechnical Institute (NGI).
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Thin-layer capping with activated carbon (AC) was deployed in experimental plots in Trondheim harbor, Norway, using caps containing AC+clay, AC-only or AC+sand. Intact sediment cores were collected from the in situ remediated plots to study the capping efficiency of the various AC treatments in reducing the aqueous concentrations and the bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in the polychaete Hediste diversicolor and the clam Abra nitida. Reduced aqueous concentrations were observed in all AC-treatments, but generally AC+clay appeared to be superior to the other tested treatments. Capping efficiency by AC+clay, in terms of reduced bioaccumulation of PAHs and PCBs, ranged between 40 % and 87% in the worms and between 67% and 97% in the clams. Sediment capped with AC-only also led to reduced bioaccumulation of PCBs, while AC+sand showed no reduction in bioaccumulation. The worms had lower relative lipid content in the AC-only treatment after exposure.

Keyword [en]
Thin-layer capping, sediment remediation, contaminated sediment, Hediste (Nereis) diversicolor (Polychaeta) and Abra nitida (Mollusca).
National Category
Biological Sciences Chemical Sciences Earth and Related Environmental Sciences
Research subject
Marine Ecotoxicology
Identifiers
URN: urn:nbn:se:su:diva-94837OAI: oai:DiVA.org:su-94837DiVA: diva2:656545
Funder
Swedish Research Council, 210-2007-282Formas, 210-2007-282Vinnova, 210-2007-282
Available from: 2013-10-16 Created: 2013-10-16 Last updated: 2013-10-16
In thesis
1. In situ remediation of contaminated sediments using thin-layer capping: efficiency in contaminant retention and ecological implications
Open this publication in new window or tab >>In situ remediation of contaminated sediments using thin-layer capping: efficiency in contaminant retention and ecological implications
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hydrophobic organic contaminants (HOCs) often reside in sediments sorbed to particles, most tightly to particles with high content of organic carbon. If persistent, such pollutants can accumulate in the sediment for many years and constitute a contamination risk for sediment-living organisms and organisms at higher trophic levels, including humans.

Since traditional remediation techniques are associated with complications (e.g. release of contaminants during dredging operations, disturbance of benthic faunal communities), or constraints (handling of large amounts of contaminated sediment and water, limitations due to depth and size of the area, high costs), there is a need for new alternative methods.

In situ remediation through thin-layer capping (a few centimeter cover) with a sorbing material such as activated carbon (AC) has been proposed as an alternative remediation method. Compared to traditional remediation techniques, AC amendment in a thin layer means less material handling and lower costs and is assumed to be less disruptive to benthic communities. The objectives of this thesis were to investigate the ecological effects from thin layer capping as well as the efficiency in contaminant retention.

Thin layer capping amended with AC proved to reduce availability of HOCs to the tested organisms, the gastropod Nassarius nitidus (Paper II), the clam Abra nitida (Paper III) and to polychaete worms  (Paper II and III). The remediation technique also decreased the sediment-to-water fluxes of the contaminants (Paper II and III).

However, AC amended thin-layer capping was also found to cause negative biological effects. In laboratory studies with only a few species the negative effects were minor, or difficult to discern with the endpoints used (Paper II and III). In a larger multi-species mesocosm (boxcore) study, on the other hand, the negative effects were more prominent (Paper I) and in a large scale field study the benthic community was found to be profoundly disturbed by the AC amendment, with the effects persisting or even worsening ca one year (14 months) post amendment (Paper IV).

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2013. 34 p.
Keyword
Contaminated Sediment Remediation, Activated Carbon, Benthic Community, Ecological Effects, Stress, Resilience, Contaminant Sequestration, Capping Efficiency, Bioavailability, Bioaccumulation, Sediment-to-water fluxes
National Category
Biological Sciences Environmental Sciences Oceanography, Hydrology, Water Resources
Research subject
Marine Ecotoxicology
Identifiers
urn:nbn:se:su:diva-94845 (URN)978-91-7447-795-5 (ISBN)
Public defence
2013-11-15, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 09:00 (English)
Opponent
Supervisors
Projects
CarbocapOpticapThinc
Funder
Swedish Research Council, 210-2007-282Formas, 210-2007-282Vinnova, 210-2007-282
Note

At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 3: Manuscript; Paper 4: Manuscript.

Available from: 2013-10-24 Created: 2013-10-16 Last updated: 2014-06-27Bibliographically approved

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