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Figure SPM.. Overview of ocean storage concepts. In “dissolution type” ocean storage, the CO2 rapidly dissolves in the ocean water, whereas in “lake type” ocean storage, the CO2 is initially a liquid on the sea floor (Courtesy CO2CRC). The dissolved and dispersed CO2 would become part of the global carbon cycle and eventually equilibrate with the CO2 in the atmosphere. In laboratory experiments, small-scale ocean experiments and model simulations, the technologies and associated physical and chemical phenomena, which include, notably, increases in acidity (lower pH) and their effect on marine ecosystems, have been studied for a range of ocean storage options (Sections 6.1.2, 6.2.1, 6.5, 6.7). developed further for utilization in the design and operation of geological storage projects. Three industrial-scale12 storage projects are in operation: the Sleipner project in an offshore saline formation in Norway, the Weyburn EOR project in Canada, and the In Salah project in a gas field in Algeria. Others are planned (Sections 5.1.1, 5.2.2, 5.3, 5.6, 5.9.4, Boxes 5.1, 5.2, 5.3). . Ocean storage potentially could be done in two ways: by injecting and dissolving CO2 into the water column (typically below 1,000 meters) via a fixed pipeline or a moving ship, or by depositing it via a fixed pipeline or an offshore platform onto the sea floor at depths below 3,000 m, where CO2 is denser than water and is expected to form a “lake” that would delay dissolution of CO2 into the surrounding environment (see Figure SPM.5). Ocean storage and its ecological impacts are still in the research phase13. 12 “Industrial-scale” here means on the order of 1 MtCO2 per year. 13 “Research phase” means that while the basic science is understood, the technology is currently in the stage of conceptual design or testing at the laboratory or Summary for Policymakers 7 9. The reaction of CO2 with metal oxides, which are abundant in silicate minerals and available in small quantities in waste streams, produces stable carbonates. The technology is currently in the research stage, but certain applications in using waste streams are in the demonstration phase. The natural reaction is very slow and has to be enhanced by pre-treatment of the minerals, which at present is very energy intensive (Sections 7.2.1, 7.2.3, 7.2.4, Box 7.1). bench scale and has not been demonstrated in a pilot plant.PDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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