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Poster De Conférence Année : 2023

Management of dredged marine sediments in southern France : main keys to large-scale beneficial re-use

Résumé

Fifty million cubic meters of marine sediments are dredged each year in France in order to maintain and develop harbor activities and sustain the economy of littoral territories. Because of anthropogenic activities in and around these harbours, sediments are often enriched in pollutants that can be released when sediments are dredged and induce a risk for human and environment. French regulations come to govern the management of dredged marine sediments, considering them ‘safe’ and possibly to be dumped at sea or contaminated’ and needed to be treated on land as waste. However, sediments can be considered as valuable resources but they remain today lowly reused. This poster provides an overview of the technical and regulatory aspects elated to dredged marine sediment management in France and aims to determine why dredged marine sediments are not fully utilized as a resource and whether these barriers can be overcome. The regulation for the management of dredged material is complex and lies at the intersection of the European framework directives on water (WFD), waste and marine strategy. While WFD provides for European reference values for priority substances, there are no common European standards for sediments. Dredged sediments are mainly composed of particles with heterogeneous grain size that can be used in applications ranging from building materials to plant growing media. The organic matter and heavy metals potentially present can also be used for beneficial purposes. There are several reasons why not all dredged sediment is used. These include the irregular composition of dredged sediments, the frequent presence of pollutants in the sediments and the high cost associated with reusing dredged sediments compared to other sources. The variable nature of dredged sediments means that materials made from them have different attributes. High processing costs are also a barrier to the reuse of dredged sediments. Steps required to prepare dredged sediments for reuse result in higher prices than for similar resources. These barriers lead to a low demand for dredged sediments. This demand can be stimulated by overnment incentives and a good regulatory framework. Cost would decrease with the increasing reuse of dredged sediments, as processes would become more efficient and new treatment methods would be tried. National regulations could help streamline this process by standardizing sediment composition tests, removing the classification of dredged sediments as ”waste” and creating a regulated market for dredged sediments, thereby creating a promising economic sector.
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Dates et versions

hal-04095742 , version 1 (30-05-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : hal-04095742 , version 1

Citer

Garry Dorleon, Sylvain Rigaud, Isabelle Techer. Management of dredged marine sediments in southern France : main keys to large-scale beneficial re-use. International Symposium on Environmental Biotechnology and Engineering (7ISEBE), May 2023, Marseille, France. https://7isebe.sciencesconf.org/441925. ⟨hal-04095742⟩

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