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Remediation of a Eutrophic Bay in the Baltic Sea
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
Number of Authors: 4
2017 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 51, no 8, 4559-4566 p.Article in journal (Refereed) Published
Abstract [en]

Eutrophication of coastal ecosystems is a global problem that often results in bottom water oxygen deficiency and in turn promotes sediment phosphorus (P) release (A). In order to increase sediment P retention, we injected dissolved aluminum into the anoxic sediment of a eutrophic semienclosed bay in the Baltic Sea, thereby inhibiting P recycling and further eutrophication (B). The P concentration in the bay remained at half, as did phytoplankton biomass (C), compared to pretreatment conditions and compared to the reference bay. Four years after treatment the water column transparency was increased, allowing submerged vegetation to penetrate deeper, and the habitat suitable for fish and benthic fauna had expanded (D). The lowered P concentration in the bay decreased the P export to the surrounding archipelago. This is the first full-scale marine remediation project using a geo-engineering method that demonstrates a quick recovery. For successful remediation in coastal areas, permanent binding of mobile P in anoxic sediments may be needed together with measures in the catchment area to obtain faster recovery of eutrophicated marine ecosystems.

Place, publisher, year, edition, pages
2017. Vol. 51, no 8, 4559-4566 p.
National Category
Environmental Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-143578DOI: 10.1021/acs.est.6b06187ISI: 000399859700046PubMedID: 28350961OAI: oai:DiVA.org:su-143578DiVA: diva2:1104371
Available from: 2017-06-01 Created: 2017-06-01 Last updated: 2017-06-01Bibliographically approved

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