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Cleaning and dewatering ponds in urban area’s

For the Water Council ?Velt & Vecht?, KLAAR has dredged several ponds in the housing estate area ?Baalder? which belongs to the city of Hardenberg. The dredged-up material (silt/sludge) has been dewatered by using Geotube® The engineering of this project was done by ?Ingenieursbureau Tauw? from Assen (NL).

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Small cutter dredger “Pollux” is cleaning up one of the ponds.

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By using an “Auger” draghead it is possible to dredge thin layers of silt from the bottom and pump it into a processing and dewatering plant.

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With a special polymer unit, the polymer (flocculant) is added to the dredged up material (silt/sludge) before it is pumped into Geotube®. By using a specific polymer (flocculant) the silt/sludge will separate from water.

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The operator of Klaar is monitoring and handling the Geotube®. By using a walky-talky the operator can communicate with the dredgemaster.

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The silt/sludge is equally pumped in Geotube® for optimal dewatering results.

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Geotube® can dewater silt/sludge up to 60% of its dry solids. Afterwards the tubes will be opened and the dried material can be transported to its final destination.

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Dewatering of silt/sludge by mean of Geotube® can shorten the period of the clients legal procedures. The use of space can be minimised by using Geotube®. It creates the possibility of high speed dewatering (in several weeks) combined with high percentages of dry solids (50 till 60% ds).