Information about the Renere havn cleanup project in English.
Project for a cleaner harbor
Trondheim's aim is to restore the port basin to its desired depth and halt the further spread of contaminated sediments. Dredged sediments will partly be placed in an underwater cell and partly be re-used for land reclamation. Dredged areas will be covered with a gravel layer to prevent the further spread of residual contamination. The project will start in the Spring of this year and continue to April 2016.
Over the years, samples of both sediments and biota from Trondheim harbor have been analyzed for pollutants, most recently in 2010. The results show up to high levels of contaminated sediments in several areas. A survey of pollutants in fish, mussels and sea weed, done in 2010, shows that concentrations of pollutants in water are decreasing. This is a result of the work done to stop the sources on land. The seabed itself is now one of the biggest sources of pollutants in the harbor area.
Highly contaminated seabed
The sea bed in Trondheim is up to highly contaminated by heavy metals and micro pollutants such as lead, copper, PAH, PCB and TBT. Pollutants of even low concentrations in the sediments are harmful to benthic organisms and the environment. Accumulation of pollutants in the food chain may cause health problem to humans. Emissions over the last years have resulted in highly contaminated sediments with effects on the local environment, representing a risk for pollutants spreading to other areas in the harbor and the fjord system.
Resuspension from coastal traffic
Catamarans, a future guest harbor and boats in Brattøra and Kanalen cause risk of erosion and thereby resuspension of contaminated sediments in the water. Capping of the sediments gives a clean surface and reduces erosion and thereby the risk of dispersal of sediments. Where water depth in the areas must be kept at today's levels, sediments must be dredged and relocated before capping the seabed.
Disposal of contaminated sediments
Dredging and capping is planned for Nyhavna as well as Brattøra and Kanalen. Because of the need for extensive remediation, Nyhavna is the best location for a disposal site at the shore, i.e. a near shore deposit, as done at Pir II, where dregded contaminated sediments were stabilized and solidified to build useful land.