4.7 Article

An overview of operations and processes for circular management of dredged sediments

期刊

WASTE MANAGEMENT
卷 146, 期 -, 页码 20-35

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2022.04.040

关键词

Circular economy; Dredged sediment; Heavy metals; Organic pollutants; Sediment treatment

资金

  1. Marche Region for the call Impresa 4.0: Innovazione, ricerca e formazione about supporting business innovation towards a circular economy model (year 2019) [44995]
  2. European Union [101036449]
  3. European Social Fund
  4. Regione Marche and Servizi Industriali Manageriali Ambientali S. p.A.
  5. Spanish Ministry of Universities
  6. Next generation EU funds
  7. Xi'an Technological University

向作者/读者索取更多资源

Dredging is crucial for maintaining proper water depths in ports and bays, but the resulting sediments often contain high levels of toxic metals and pollutants. Conventional linear sediment management methods are unsustainable, and more efficient circular approaches are needed. However, the development of sediment-based by-products is still limited, and technical and socio-political barriers need to be overcome to implement circular economy in the dredged sediment sector.
Dredging is an essential technique to maintain proper water depths in ports and bays. Many dredged sediments are considered as toxic waste due to their significant amounts of metals and other pollutants. In consequence, they need to be treated to reduce this toxicity and avoid pollutant resuspensions. Physical operations and chemical, thermal and biological processes have been conventionally used to this aim, but the traditional linear sediment approach is often unsustainable and economically and environmentally demanding. Considering the increasing people's awareness in environmental issues, more efficient dredged sediment management schemes are required. Some authors are making significant efforts to improve circularity in sediment management processes by taking advantage of the mineral composition of sediments to obtain products for the building and road construction sectors, therefore decreasing the need of raw materials while reducing the amounts of sediments wasted to landfills. However, information related to the characteristics of these products, their mechanical behaviour and their functionality is still scarce, being sediment-based by-products developed mainly at low Technological Readiness Level (TRL), showing low global impact in the market. To implement circular economy in the dredged sediment sector, some technical and socio-political barriers must be still overcome. To this aim, further research and technological applications must be developed, with the support of decision makers and stakeholders. This review aims at giving an overview of the circular trends applied to toxic dredged sediment management, pointing at current opportunities, barriers and constraints that hinder its wide development.

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