The effects of electrochemical pretreatment and curing environment on strength and leaching of stabilized/solidified contaminated sediment
Journal article, 2024

Stabilization and solidification (S/S) is known to improve the structural properties of sediment and reduce contaminant mobility, enabling the utilization of dredged contaminated sediment. Further reduction of contaminants (e.g., tributyltin (TBT) and metals) can be done using electrochemical treatment prior to S/S and could potentially minimize contaminant leaching. This is the first study on how electrochemical pretreatment affects the strength and leaching properties of stabilized sediments. It also investigates how salinity and organic carbon in the curing liquid affect the stabilized sediment.The results showed that the electrolysis reduced the content of TBT by 22% and zinc by 44% in the sediment. The electrolyzed stabilized samples met the requirements for compression strength and had a reduced surface leaching of zinc. Curing in saline water was beneficial for strength development and reduced the leaching of TBT compared to curing in fresh water. The results indicate that pretreatment prior to stabilization could be beneficial in reducing contaminant leaching and recovering metals from the sediment. The conclusion is that a better understanding of the changes in the sediment caused by electrochemical treatment and how these changes interact with stabilization reactions is needed. In addition, it is recommended to investigate the strength and leaching behavior in environments similar to the intended in situ conditions.

Stabilization and solidification

Dissolved organic carbon

Leaching

TBT

Compressive strength

Salinity

Zn

Curing

Author

Anna Norén

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Ann-Margret Hvitt Strömvall

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Sebastien Rauch

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Yvonne Andersson-Sköld

Chalmers, Architecture and Civil Engineering

Oskar Modin

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Karin Karlfeldt Fedje

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Environmental Science and Pollution Research

0944-1344 (ISSN) 16147499 (eISSN)

Vol. 31 5866-5880

Treatment of Tin Contaminated Marine Sediments: Degradation, Recovery and Stabilization

Formas (942-2015-188), 2016-01-01 -- 2019-12-31.

Renova, 2016-01-01 -- 2020-12-31.

IMplementing MEasuRes for Sustainable Estuaries (IMMERSE)

European Commission (EC) (J-No:38-2-9-17), 2018-07-01 -- 2021-12-31.

Hållbar användning och behandling av marina muddermassor

Signe och Olof Wallenius Stiftelse (StipendieAnnaNorén), 2022-09-01 -- 2023-04-30.

Behandling av tennorganiskt förorenade sediment: återvinning och stabilisering

Swedish Energy Agency (46125-1), 2018-06-28 -- 2020-06-30.

Renova, 2018-06-28 -- 2020-06-30.

Chalmers, 2018-06-28 -- 2020-06-30.

Subject Categories

Civil Engineering

DOI

10.1007/s11356-023-31477-6

PubMed

38133763

More information

Latest update

6/25/2024