期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 16, 页码 14218-14233出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-8851-6
关键词
Benthic ecology; Macrofauna; Benthic community; Feeding guilds; Contaminated sediment; Remediation
资金
- Norwegian Research Council NFR [182720/I40]
- Swedish Research Council Formas Vinnova [210-2007-282]
- Norsk Hydro
- Norwegian Environment Agency
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.
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