Damen DOP Dredge Pump Used in Harderwijk

Along the waterfront in Harderwijk, an old town in the center of the Netherlands, a new residential area is being built.

The site was formerly used as industrial area, which has resulted in a polluted top layer of the soil. To avoid handling this polluted material, Boskalis used an innovative and challenging method: a DOP250 was used to mine clean sand from deeper down, and cover the polluted layer – which remained in place.

The DOP is lowered in the hole using its own weight, to a max depth of ca -8.5m. Once at this depth plenty of jet nozzles spaying sideways create a pumpable mixture. The dredged mixture is pumped to a spoil field approx. 600 m away.

The mined sand is entirely clean, good quality, coarse building sand – excellent for sealing of the polluted soil. When the projects is ready, the entire area will be covered with a 2m layer of clean top soil.

Great care is taken to control the complex dredging process. The jet water used for losing the soil and transporting the sand, is recirculated. During the recirculating process the quality of the water is monitored.

For the full duration of the process the water has been tested as clean and unpolluted. The 3m thick polluted layer of soil has proven to remain in situ. Moreover, the sand won is continually checked and found clean and unpolluted.

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3rd International Congress Hydraulic Engineering Structures and Dredging

Russia’s leading maritime industry Media Group PortNews (www.portnews.ru) holds a traditional annual Congress “Hydraulic Engineering Structures and Dredging” in Moscow. 

The two-day Congress includes the 7th International Forum of Dredging Companies and the 3rd Technical Conference “Modern Solutions for Hydraulic Engineering”.

Infrastructure development is among the real sources of Russia’s economy growth. Construction of port facilities and new hydraulic engineering structures on the country’s inland waterways constitute an essential part of all infrastructure projects. It is important to take into account the best international practices to implement these projects effectively.

The program of the Congress will be devoted to the latest technologies for dredging and hydraulic engineering works. Speakers and delegates will refer to real projects to discuss specifics features of dredging works, as well as dedicated fleet and equipment involved.

To learn more about event, please, contact the organizing committee: snitko@portnews.ru

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