Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal
At present, there are no standardised tests to assess metal leaching during submarine tailings discharge. In this study the influence of variables known to affect metal mobility and availability (dissolved organic carbon (DOC), pH, salinity, temperature, aerated/anoxic conditions) along with variabl...
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Language: | English |
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2022
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Online Access: | https://orbit.dtu.dk/en/publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 https://doi.org/10.1016/j.marpolbul.2022.114197 |
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ftdtupubl:oai:pure.atira.dk:publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 2024-09-15T18:25:54+00:00 Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal Pedersen, Kristine B. Lejon, Tore Jensen, Pernille E. Ottosen, Lisbeth M. Frantzen, Marianne Evenset, Anita 2022 https://orbit.dtu.dk/en/publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 https://doi.org/10.1016/j.marpolbul.2022.114197 eng eng https://orbit.dtu.dk/en/publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 info:eu-repo/semantics/closedAccess Pedersen , K B , Lejon , T , Jensen , P E , Ottosen , L M , Frantzen , M & Evenset , A 2022 , ' Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal ' , Marine Pollution Bulletin , vol. 184 , 114197 . https://doi.org/10.1016/j.marpolbul.2022.114197 Submarine mine tailings disposal Metal leaching Metal partitioning Magnafloc10 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2022 ftdtupubl https://doi.org/10.1016/j.marpolbul.2022.114197 2024-08-13T00:03:06Z At present, there are no standardised tests to assess metal leaching during submarine tailings discharge. In this study the influence of variables known to affect metal mobility and availability (dissolved organic carbon (DOC), pH, salinity, temperature, aerated/anoxic conditions) along with variables affected by the discharge conditions (flocculant concentration, suspension) were studied in bench-scale experiments. The leaching tests were developed based on the case of a copper mine by Repparfjorden, northern Norway, which is planned to re-open in 2022. The experiments, which had three week duration, revealed low (less than 6 %) leaching of metals. Multivariate analysis showed that all variables, apart from DOC, highly influenced leaching and partitioning of at least one metal (Ba, Cr, Cu, and/or Mn). The high quantity of the planned annual discharge of mine tailings to the fjord (1–2 million tonnes) warranted estimation of the leached quantity of metals. Multivariate models, using present-day conditions in the fjord, estimated leaching of up to 124 kg Ba, 154 kg Cu and 2400 kg Mn per year during discharge of tailings. Future changes in the fjord conditions caused by climate change (decreased pH, increased temperature) was predicted by the multivariate models to increase the leaching up to 55 %, by the year 2065. The bench-scale experiments demonstrated the importance of including relevant variables (such as pH, salinity, and temperature) for metal leaching and -partitioning in leaching tests. The results showed that metal leaching during discharge is expected and will increase in the future due to the changed conditions caused by the foreseen climate change, and thereby underline the importance of monitoring metal concentrations in water during operations to determine the fate of metals in the fjord. Article in Journal/Newspaper Northern Norway Technical University of Denmark: DTU Orbit Marine Pollution Bulletin 184 114197 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Submarine mine tailings disposal Metal leaching Metal partitioning Magnafloc10 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
Submarine mine tailings disposal Metal leaching Metal partitioning Magnafloc10 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Pedersen, Kristine B. Lejon, Tore Jensen, Pernille E. Ottosen, Lisbeth M. Frantzen, Marianne Evenset, Anita Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
topic_facet |
Submarine mine tailings disposal Metal leaching Metal partitioning Magnafloc10 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
description |
At present, there are no standardised tests to assess metal leaching during submarine tailings discharge. In this study the influence of variables known to affect metal mobility and availability (dissolved organic carbon (DOC), pH, salinity, temperature, aerated/anoxic conditions) along with variables affected by the discharge conditions (flocculant concentration, suspension) were studied in bench-scale experiments. The leaching tests were developed based on the case of a copper mine by Repparfjorden, northern Norway, which is planned to re-open in 2022. The experiments, which had three week duration, revealed low (less than 6 %) leaching of metals. Multivariate analysis showed that all variables, apart from DOC, highly influenced leaching and partitioning of at least one metal (Ba, Cr, Cu, and/or Mn). The high quantity of the planned annual discharge of mine tailings to the fjord (1–2 million tonnes) warranted estimation of the leached quantity of metals. Multivariate models, using present-day conditions in the fjord, estimated leaching of up to 124 kg Ba, 154 kg Cu and 2400 kg Mn per year during discharge of tailings. Future changes in the fjord conditions caused by climate change (decreased pH, increased temperature) was predicted by the multivariate models to increase the leaching up to 55 %, by the year 2065. The bench-scale experiments demonstrated the importance of including relevant variables (such as pH, salinity, and temperature) for metal leaching and -partitioning in leaching tests. The results showed that metal leaching during discharge is expected and will increase in the future due to the changed conditions caused by the foreseen climate change, and thereby underline the importance of monitoring metal concentrations in water during operations to determine the fate of metals in the fjord. |
format |
Article in Journal/Newspaper |
author |
Pedersen, Kristine B. Lejon, Tore Jensen, Pernille E. Ottosen, Lisbeth M. Frantzen, Marianne Evenset, Anita |
author_facet |
Pedersen, Kristine B. Lejon, Tore Jensen, Pernille E. Ottosen, Lisbeth M. Frantzen, Marianne Evenset, Anita |
author_sort |
Pedersen, Kristine B. |
title |
Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
title_short |
Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
title_full |
Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
title_fullStr |
Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
title_full_unstemmed |
Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
title_sort |
impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal |
publishDate |
2022 |
url |
https://orbit.dtu.dk/en/publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 https://doi.org/10.1016/j.marpolbul.2022.114197 |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Pedersen , K B , Lejon , T , Jensen , P E , Ottosen , L M , Frantzen , M & Evenset , A 2022 , ' Impacts of climate change on metal leaching and partitioning for submarine mine tailings disposal ' , Marine Pollution Bulletin , vol. 184 , 114197 . https://doi.org/10.1016/j.marpolbul.2022.114197 |
op_relation |
https://orbit.dtu.dk/en/publications/18b2e7c0-ca8d-4d36-bb43-24049ad14c24 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.marpolbul.2022.114197 |
container_title |
Marine Pollution Bulletin |
container_volume |
184 |
container_start_page |
114197 |
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1810466372481712128 |