Impact and recovery of pH in marine sediments subject to a temporary carbon dioxide leak
Impact and recovery of pH in marine sediments subject to a temporary carbon dioxide leak
A possible effect of a carbon dioxide leak from an industrial sub-sea floor storage facility, utilised for Carbon Capture and Storage, is that escaping carbon dioxide gas will dissolve in sediment pore waters and reduce their pH. To quantify the scale and duration of such an impact, a novel, field scale experiment was conducted, whereby carbon dioxide gas was injected into unconsolidated sub-sea floor sediments for a sustained period of 37 days. During this time pore water pH in shallow sediment (5 mm depth) above the leak dropped >0.8 unit, relative to a reference zone that was unaffected by the carbon dioxide. After the gas release was stopped, the pore water pH returned to normal background values within a three-week recovery period. Further, the total mass of carbon dioxide dissolved within the sediment pore fluids above the release zone was modelled by the difference in DIC between the reference and release zones. Results showed that between 14 and 63% of the carbon dioxide released during the experiment could remain in the dissolved phase within the sediment pore water.
Carbon capture and storage, Sediment pore water, pH, CO2
93-101
Taylor, Peter
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Lichtschlag, Anna
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Toberman, Matthew
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Sayer, Martin D.J.
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Reynolds, Andy
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Sato, Toru
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Stahl, Henrik
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July 2015
Taylor, Peter
0ccfe683-1eeb-483b-82bb-27a9ad727e69
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Toberman, Matthew
f07052ac-287b-4e84-b0e7-7f00d4ff3b64
Sayer, Martin D.J.
4189f618-533b-4b12-90eb-f28c13617de0
Reynolds, Andy
414cf600-6886-4aa1-9777-c6523f8ea064
Sato, Toru
8d369142-da56-44e1-aa90-5595bedff6d7
Stahl, Henrik
bdd6e6a3-906e-4714-855a-3634cf0d471b
Taylor, Peter, Lichtschlag, Anna, Toberman, Matthew, Sayer, Martin D.J., Reynolds, Andy, Sato, Toru and Stahl, Henrik
(2015)
Impact and recovery of pH in marine sediments subject to a temporary carbon dioxide leak.
International Journal of Greenhouse Gas Control, 38, .
(doi:10.1016/j.ijggc.2014.09.006).
Abstract
A possible effect of a carbon dioxide leak from an industrial sub-sea floor storage facility, utilised for Carbon Capture and Storage, is that escaping carbon dioxide gas will dissolve in sediment pore waters and reduce their pH. To quantify the scale and duration of such an impact, a novel, field scale experiment was conducted, whereby carbon dioxide gas was injected into unconsolidated sub-sea floor sediments for a sustained period of 37 days. During this time pore water pH in shallow sediment (5 mm depth) above the leak dropped >0.8 unit, relative to a reference zone that was unaffected by the carbon dioxide. After the gas release was stopped, the pore water pH returned to normal background values within a three-week recovery period. Further, the total mass of carbon dioxide dissolved within the sediment pore fluids above the release zone was modelled by the difference in DIC between the reference and release zones. Results showed that between 14 and 63% of the carbon dioxide released during the experiment could remain in the dissolved phase within the sediment pore water.
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Accepted/In Press date: October 2014
Published date: July 2015
Keywords:
Carbon capture and storage, Sediment pore water, pH, CO2
Organisations:
Marine Geoscience
Identifiers
Local EPrints ID: 370132
URI: http://eprints.soton.ac.uk/id/eprint/370132
ISSN: 1750-5836
PURE UUID: ea851ffd-cdfa-430b-b6fa-b8ac1bba4fad
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Date deposited: 16 Oct 2014 09:04
Last modified: 14 Mar 2024 18:13
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Contributors
Author:
Peter Taylor
Author:
Anna Lichtschlag
Author:
Matthew Toberman
Author:
Martin D.J. Sayer
Author:
Andy Reynolds
Author:
Toru Sato
Author:
Henrik Stahl
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