From dredged sediment to construction material

Port municipalities must regularly remove large quantities of sediment build-up to maintain suitable access for vessels and other port operations. Volumes vary depending on port architecture, currents, and tides. The extracted sediment becomes a waste product which must be managed in a context of tighter regulation on offshore dumping and high costs and limited space for onshore storage. 

GWILEN, a French company based in Brittany, received support to assess the potential for converting port sediment into construction materials, such as tiles. The project studied the sediment from more than 30 ports and mapped usable stocks. A second phase launched production activities in an industrial unit at Brest Port, processing 5,000 m³/year of sediment, transported via barge to minimize CO₂ emissions. The initiative mobilises municipalities, port managers, and labs, while emphasizing local anchoring, environmental transition, and a sustainable economic model for long-term action.