JUST ONE WORD
—— Ms. Wilken, what do you think about …Transparency?
DAC processes require huge fan blowers. These pull in air containing carbon dioxide, filter it and then expel it. There are two ways to capture the gas: amine scrubbing uses a solvent derived from ammonia that separates carbon dioxide out of the air. With carbon-dioxide absorption, a substance such as caustic soda reacts with the carbon dioxide to form a compound, which is then split to obtain pure the carbon dioxide.
Companies around the world are working to make DAC viable on a large scale. Big pilot projects can be found in Switzerland, Iceland and in the United States, for example. Various manufacturers are also competing to offer the lowest price per extracted ton: this currently ranges from 90 to 250 euros, depending on the company.
Carbon dioxide can be mineralized into calcium carbonate, which can be used to manufacture concrete or asphalt. Furthermore, carbon dioxide can also replace water for mixing concrete.
In simple terms, these fuels are made up of three parts: hydrogen, energy and carbon molecules such as carbon dioxide. For the fuels to be beneficial for the climate, the hydrogen used must be green hydrogen.
Carbon dioxide can be used to fertilize algae. In turn, the algae can be used for foodstuffs, biofuel, plastics or carbon fiber. Algae also remove carbon dioxide from the atmosphere.