A new method for removing the greenhouse gas from the ocean could be far more efficient than existing systems for removing it from the air. As carbon dioxide continues to build up in the Earth’s atmosphere, research teams around the world have spent years seeking ways to remove the gas efficientl
Researchers have found an effective new method for removing carbon dioxide from the ocean. It could be implemented by ships that would process seawater as they travel, or at offshore drilling platforms or aquaculture fish farms. Credit: Courtesy of the researchers
Recently, the possibility of removing carbon dioxide directly from ocean water has emerged as another promising possibility for mitigating COemissions, one that could potentially someday even lead to overall net negative emissions. But, like air capture systems, the idea has not yet led to any widespread use, though there are a few companies attempting to enter this area.says they may have found the key to a truly efficient and inexpensive removal mechanism.
The team came up with a reversible process consisting of membrane-free electrochemical cells. Reactive electrodes are used to release protons to the seawater fed to the cells, driving the release of the dissolved carbon dioxide from the water. The process is cyclic: It first acidifies the water to convert dissolved inorganic bicarbonates to molecular carbon dioxide, which is collected as a gas under vacuum.
Once the carbon dioxide is removed from the water, it still needs to be disposed of, as with other carbon removal processes. For example, it can be buried in deep geologic formations under the sea floor, or it can be chemically converted into a compound like ethanol, which can be used as a transportation fuel, or into other specialty chemicals.
The system could also be implemented at locations such as offshore drilling platforms, or at aquaculture farms. Eventually, it could lead to a deployment of free-standing carbon removal plants distributed globally.
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