Environmental Dredging of a Chromium Contaminated Fjord
Environmental Dredging of a Chromium Contaminated Fjord

The sediments in Valdemarsviken fjord in Sweden were contaminated with chromium from the discharge of untreated wastewater from tannery operations decades ago. The contaminated sediments were dredged, dewatered, solidified and placed as a engineered fill in a nearshore area.

Dredging Phase I of the Non-Time Critical Removal Action in the Lower Passaic River
Dredging Phase I of the Non-Time Critical Removal Action in the Lower Passaic River

Removing sediments with high dioxin concentrations requires extra care, with modern surveying and tracking techniques from beginning to end, from dredging to a high-tech dewatering process to the final disposal.

Remediation of Contaminated Sediment: A Worldwide Status Survey of Regulation and Technology
Remediation of Contaminated Sediment: A Worldwide Status Survey of Regulation and Technology

Remediation projects are becoming more frequent: Here’s a snapshot of the current state of the industry, including which countries at present have a regulatory framework and/or technical framework in place (and which do not), and what technologies are actively being used.

Restoration and Development Project of South Lake of Tunis and its Shores
Restoration and Development Project of South Lake of Tunis and its Shores

At the request of the Tunisian Government, a consortium of five dredging contractors has regenerated one of the most eutrophic lagoons in the world into a living lake.

Mechanical Treatment of Dredged Material. The Malcontenta Plant in the Lagoon of Venic
Mechanical Treatment of Dredged Material. The Malcontenta Plant in the Lagoon of Venice

In an extensive pilot study, contaminated sediment dredged from an industrial channel in Venice has been mechanically treated by dehydration at a purpose-built plant near the harbour.

Emissions of Porewater Compounds and Gases from the Subaquatic Sediment Disposal Site "Rodewischhafe"
Emissions of Porewater Compounds and Gases from the Subaquatic Sediment Disposal Site “Rodewischhafe”

The 1997 IADC Award was given to this paper which was presented at the International Conference on Contaminated Sediment in Rotterdam, in September.