Strict environmental requirements? Envisan offers the solution.

In Finland, we won a contract for deepening the access channel to the port of Oulu, 150 km outside the Arctic Circle.  Our choice of heavy equipment, i.e. the cutter dredger Fernao Magellan and the trailing suction hopper dredger Alexander Von Humboldt, enabled us to complete the works within nature’s own deadline, i.e. before the harbour got frozen over. This heavy duty solution, on the other hand, also required the supply and timely removal of a great many pipelines and dry equipment.

Thanks to the efficient cooperation with our Environment Division, the project could be completed within time and according to the strict environmental requirements!


In addition, the project had very specific and strict environmental requirements imposed in terms of turbidity, the measure for the amount of suspended particles in water. To be able to execute this project within the pre-set standards, we turned to the environmental experts of our group company Envisan. Together with the client, we developed a working method that completely met all the turbidity requirements. The method entailed a very accurate, precisely metered addition of certain chemically active substances that enhance the natural bonding of particles and thus result in faster particle settling. Furthermore, we suspended large underwater silt curtains in the settling basin to catch particles and silt, and ensure that the settling was accelerated and could be kept entirely within this basin. Thanks to the efficient cooperation with our Environment Division, the project could be completed within time and according to the strict environmental requirements!
 

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