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Contaminated Sediments

Review of Solutions for Protecting Aquatic Environments

image of Contaminated Sediments

The Nordic Council of Ministers have recognized the need to compile the knowledge of sediment remediation strategies and to evaluate different remediation approaches. The objective of this report is to give a status of regulatory framework and sediment management within selected Nordic countries (Norway, Sweden, Finland and Denmark). In addition, the report gives a short overview of international knowledge on remediation approaches, techniques, and materials. Governance and regulatory instruments in dealing with contaminated sediments vary between countries. Of the countries presented, only Norwegian environmental authorities have implemented a national strategy for remediation of marine contaminated sediments. A Nordic database of clean-up projects and long-term monitoring would improve the exchange of knowledge between the Nordic countries.

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State of art: remediation methods and approaches

Historically, the most commonly used sediment remediation approach has been removal of the contaminated sediment by dredging and excavation and disposal/ treatment off site. Isolation of the contaminated sediment by capping with and without an active barrier have recently been implemented in some countries. Other approaches including use of thin layer amendment with active materials, in situ stabilization, and monitored natural recovery have been developed but to a lesser degree implemented. The recent progress in development of active materials and different types of capping materials are promising for further development of feasible low-impact and cost-efficient remediation approaches, but the efficiency and potential adverse effects should be further investigated.

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