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Response of marine benthic fauna to thin-layer capping with activated carbon in a large-scale field experiment in the Grenland fjords, Norway
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Svensk Ekologikonsult, Sweden.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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Number of Authors: 6
2017 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 24, no 16, 14218-14233 p.Article in journal (Refereed) Published
Abstract [en]

A field experiment with thin-layer capping was conducted in the Grenland fjords, Norway, for remediation in situ of mercury and dioxin-contaminated sediments. Experimental fields at 30 and 95 m depth were capped with (i) powdered activated carbon (AC) mixed with clay (AC+clay), (ii) clay, and (iii) crushed limestone. Ecological effects on the benthic community and species-feeding guilds were studied 1 and 14 months after capping, and a total of 158 species were included in the analyses. The results show that clay and limestone had only minor effects on the benthic community, while AC+clay caused severe perturbations. AC+clay reduced the abundance, biomass, and number of species by up to 90% at both 30 and 95 m depth, and few indications of recovery were found during the period of this investigation. The negative effects of AC+clay were observed on a wide range of species with different feeding strategies, although the suspension feeding brittle star Amphiura filiformis was particularly affected. Even though activated carbon is effective in reducing sediment-to-water fluxes of dioxins and other organic pollutants, this study shows that capping with powdered AC can lead to substantial disturbances to the benthic community.

Place, publisher, year, edition, pages
2017. Vol. 24, no 16, 14218-14233 p.
Keyword [en]
Benthic ecology, Macrofauna, Benthic community, Feeding guilds, Contaminated sediment, Remediation
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-144679DOI: 10.1007/s11356-017-8851-6ISI: 000402748300029PubMedID: 28421523OAI: oai:DiVA.org:su-144679DiVA: diva2:1128117
Available from: 2017-07-21 Created: 2017-07-21 Last updated: 2017-07-21Bibliographically approved

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Raymond, CarolineGunnarsson, Jonas S.
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