Permanent storage of carbon dioxide in the marine environment: the solid CO(2) penetration
To circumvent the uncertainty related to presently studied ocean disposal options based on pumping of liquid carbon dioxide or hydrate slurry injection at depth, with the associated risk of short term physical and biological oceanographic processes returning an important fraction of it to the atmosphere, a disposal technique using the natural geochemical storage properties of deep marine (carbonate or aluminosilicate rich) sedimentary formations is suggested. The technique proposed would depend on the fact that carbon dioxide can be obtained as a solid by cooling to -78.5 C. The overall density is approximately one and a half times that of seawater. If the solid was shaped as a torpedo and then left to fall through the water column it would penetrate quite deeply into soft underlying sediments. This concept should, therefore, provide permanent storage as the carbon dioxide will be chemically sequestered by the sediments (via the formation of an intermediate clathrate). The penetrator option has a further major advantage in that there should be no long term effects to biological systems: penetrator disposal is deep within sedimentary formations which have zero or very low biological activity.
Bibliographic Reference: Paper presented: Greenhouse Gases : Mitigation Options, London (GB), August 22-25, 1995
Availability: Available from (1) as Paper EN 39588 ORA
Record Number: 199610414 / Last updated on: 1996-04-15
Original language: en
Available languages: en