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This permanent storage process is known as ‘sequestration’.Īlternatively, the CO 2 can be pumped under low pressure for immediate use in commercial processes, such as carbonating drinks or cement manufacturing.Ī 2021 study by the Coalition for Negative Emissions shows that DACS could provide at least 1Gt of sustainable negative emissions by 2025 DACS fast facts The captured CO 2 can then be compressed under very high pressure and pumped via pipelines into deep geological formations. The new compound is heated, releasing the CO 2 to be captured and separating it from the chemical agent, which can then be recycled. Solid DACS systems captures CO 2 on the surface of a filter covered in a chemical agent, where it then forms a compound. Liquid DACS systems pass the air through a chemical solution which removes the CO 2 and returns the rest of the air back into the atmosphere. Just as plants use photosynthesis to convert sunlight and CO 2 into sugar, DACS systems use electricity to remove CO 2 from the atmosphere using fans and filters.Īir is drawn into the DACS system using an industrial scale fan. As a technology that removes more CO 2 from the atmosphere than it releases – assuming it is powered by green electricity – DACS has the potential to play a key role in this process.ĭACS could be described as a form of industrial photosynthesis. But it’s not enough just to cut CO 2 emissions, to achieve net zero, it will also be necessary to remove the CO 2 that two centuries of industrialisation have released into the environment. Unlike other carbon removal technologies that capture CO 2 emissions during the process of generating electricity or heat, DACS can be deployed anywhere in the world it can tap into a supply of electricity.ĬO 2 removal is crucial to meeting the international climate goals set by the 2015 Paris Agreement. What is direct air carbon capture and storage (DACS)?ĭirect air carbon capture and storage (DACS, sometimes referred to as DAC or DACCS) is one of the few technologies that can remove carbon dioxide (CO 2) from the atmosphere.