Historical pulp manufacturing industry in Karlsh?ll, Lule?, Sweden, hasresulted in mercury-contaminated fiber sediments. A previous risk assessment concludedthat the mercury-contaminated sediments are a subject for remediation. The primary keystakeholder, municipality of Lule?, has established a project team to investigate andevaluate solutions for an environmentally safe, successful, cost-effective and remediation.Different technical solutions for remedial measures have been studied. Preferential focushas been on dredging, but coverage has also been studied extensively in a separate study.The project has also studied various options for handling of dredged materials, either bylandfill or incineration. The possibilities for deposition are limited by the fiber sedimentshigh organic content, which means a departure from landfill regulations is necessary.Preliminary conclusion of the project is currently for dredging to be the main option. Itmay also be relevant for smaller areas to be covered, mostly where water depth is greatest.The most critical issue will be the disposal of dredged material. Future work willaddress for example stabilization methods and pilot tests for various dredging techniques.
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