Low impact leaching agents as remediation media for organotin and metal contaminated sediments
Artikel i vetenskaplig tidskrift, 2021

All over the world, elevated levels of metals and the toxic compound tributyltin (TBT) and its degradation products are found in sediments, especially close to areas associated with shipping and anthropogenic activities. Ports require regular removal of sediments. As a result, large volumes of often contaminated sediments must be managed. The aim of this study was to investigate enhanced leaching as a treatment method for organotin (TBT) and metal (Cu and Zn) contaminated marine sediments. Thus, enabling the possibility to reuse these cleaner masses e.g. in construction. In addition to using acid and alkaline leaching agents that extract the OTs and metals but reduce the management options post treatment, innovative alternatives such as EDDS, hydroxypropyl cellulose, humic acid, iron colloids, ultra-pure Milli-Q water, saponified tall oil (“soap”), and NaCl were tested. Organotin removal ranged from 36 to 75%, where the most efficient leaching agent was Milli-Q water, which was also the leaching agent achieving the highest removal rate for TBT (46%), followed by soap (34%). The TBT reduction accomplished by Milli-Q water and soap leaching enabled a change in Swedish sediment classification from the highest class to the second highest class. The highest reduction of Zn was in HPC leached samples (39% removal) and Cu in EDDS leached samples (33% removal). Although high metal and OT leaching were achieved, none of the investigated leaching agents are sufficiently effective for the removal of both metals and OTs. The results of this study indicate that leaching with ultra-clean water, such as Milli-Q water, may be sufficient to treat TBT contaminated sediments and potentially allow mass reuse.

Low environmental impact

Tributyltin removal

Sediment treatment

Contaminated sediment

Metal extraction

Sediment washing

Författare

Anna Norén

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Karin Karlfeldt Fedje

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Recycling and Waste Management

Ann-Margret Hvitt Strömvall

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Sebastien Rauch

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Yvonne Andersson-Sköld

Statens Väg- och Transportforskningsinstitut (VTI)

Chalmers, Arkitektur och samhällsbyggnadsteknik

Journal of Environmental Management

0301-4797 (ISSN) 1095-8630 (eISSN)

Vol. 282 111906

Ämneskategorier

Miljövetenskap

DOI

10.1016/j.jenvman.2020.111906

Mer information

Senast uppdaterat

2021-02-04