Sediment and Sludge Treatment

AMORAS (Antwerp, Belgium)

Large scale dewatering project for dredged material in de Port of Antwerp. The goal is to offer a new and sustainable solution to the saturation of underwater cells and unloading quays in the Port.

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This drawing shows the seven important steps in the AMORAS project.

Soft Soil Improvement® (SSI)

Soft Soil Improvement® (SSI) is a technique that immobilises and stabilises contaminated sediment. DEC used this technique to immobilise and stabilise the contaminated sediments in an old river bed in Vilvoorde (Belgium).

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SSI® is the combination of very high pressure grouting and deep chemical mixing.

Mechanical sediment dewatering plant Nyrstar (fka Umicore, Balen)

The lack of storage capacity for goethite sludge necessitates that Nyrstar find a different solution. DEC in joint venture designed, built and operates a mechanical dewatering system on the site that solves the company’s storage problems.

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Sediment can be dewatered with a mechanical dewatering system (Nyrstar, Balen).

Vacuum consolidation Kluizendok (Gent, Belgium)

In this project, vacuum consolidation was installed for the first time using horizontal drains instead of vertical drains. This method has numerous other benefits!

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For the first time, horizontal consolidation was preferred to vertical consolidation.

Environmental dredging of two lakes contaminated with mercury (Hultsfred, Sweden)

This project includes the environmental dredging and processing of mercury contaminated sediments, and the construction of a storage cell for the dewatered sediment using Geotubes.

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We dimensioned and designed the Pixy ourselves. The vessel consists of eight different pontoons.

Environmental dredging in the harbour of Castletownbere (Ireland)

In the port of Castletownbere, contaminated sediment was dredged in an environmentally friendly manner. Due to the contamination, the sediment was either disposed of or reused as construction material .

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In this project, the access to the Castletownbere harbour was deepened using a mechanical environmental dredging technique.

Environmental dredging in Nieuwpoort and Blankenberge (Belgium)

The maintenance dredging works performed in the harbour of Nieuwpoort were intended to maintain the maritime access to the harbour and the berths.

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The Blani, environmentally dredging in the marina of Nieuwpoort (Belgium).