Captura, a company of the California Institute of Technology, developed a system to separate CO2 from seawater, and at the same time discharge the filtered water back to the ocean
The carbon filtration process will utilize Captura's patented electrolysis process called Direct Ocean Capture (DOC). The company aims for large-scale carbon removal at a lower cost than older methods. The system also only uses renewable electricity and seawater as input to reduce environmental impact, New Atlas reported on May 11.
DOC technology has the ability to filter billions of tons of carbon from the ocean. Accordingly, the purified seawater stream is fed into the filtration facility, which uses electrolysis technology to create acid. This acid is then added to seawater, triggering a chemical reaction that separates CO2 from the water.
The process is accelerated using a gas-liquid contactor (a type of electrical switch) and a vacuum pump, which creates a stream of CO2. This amount of CO2 can then be sequestered or reused for other purposes.
Neutralization of the seawater stream is accomplished by adding alkali. The decarbonized water is then released back into the sea. According to Captura, this amount of water can continue to interact with the atmosphere to absorb a large amount of CO2 equivalent to the amount initially filtered. This amazing ability makes seawater filtration systems an effective tool to reduce the impact of climate change.
In 2022, Captura will build its first sea testing facility in Newport Beach, California. The company uses a continuous flow of seawater to measure system performance and make necessary improvements. Captura will continue to improve technology in the future. The company also plans to work with AltaSea at the Port of Los Angeles to build a second DOC system that can filter 100 tons of CO2 from the ocean each year.
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