Envisan launches the construction of its centre for production of eco-materials in France

Envisan France, the French branch of the environmental division of Jan De Nul Group, world leader in maritime dredging works, launches the construction of its Soil and Sediment Treatment Centre in La Seyne-sur-Mer. This centre is specifically designed for the treatment and recycling of polluted sediments and soil.

Based on its expertise gathered in Belgium, where legislation allows for re-use of sediments in the construction industry, Envisan will open its first centre in France. It will be built on a site of 3.4 hectares (8.4 acres) and will feature several treatment techniques for polluted sediments and soil.

The centre is an extension of the SEDIMED research program, which aims to lift the administrative and regulatory barriers for allowing recycled sediments to be used in the construction works industry: roads, concrete structures, maritime works and landscaping or anti-noise pollution eco-models. This will make the centre the preferred partner for companies involved in maritime works, public and construction works and remediation works.


By Prefectural Decree on 28 November 2013, Envisan has the permit to exploit this Classified Installation for the Environment for duration of 20 years.

Centre capacity

The centre can process up to 160,000 m3 of material per year. Polluted soils can be shipped or trucked in and are deposited into watertight storage areas, where they are sorted and filtered before being treated either by bioremediation or by means of hydraulic, mechanic or physico-chemical treatment. Dredging sediments are pumped into a watertight lagoon for subsequent natural or mechanical dewatering.

The Soil and Sediment Treatment Centre has been designed to respect all applicable environmental protection standards (Quality, Hygiene, Health, Security, Environment) and conforms to the strict regulations on traceability. The centre also features a water treatment plant.

Applied techniques

Mechanical dewatering by means of filter presses, dewatering by active lagooning, pre-treatment by granulometric separation (cycloning, desanding, filtering), biological treatment, washing, physico-chemical treatment.