Engineering faculty at the University of California Los Angeles say they have developed a technique that can remove carbon dioxide from seawater and produce green hydrogen, a clean fuel, in the process
Dante Simonetti, associate professor and vice chair for undergraduate education at the UCLA Samueli Chemical and Biomolecular Engineering Department, explains a technology dubbed SeaChange during a news conference, Wednesday, April 12, 2023, in San Pedro, Calif. Engineering faculty the university say they have developed a technique that can remove carbon dioxide from seawater and produce hydrogen, a green energy fuel, in the process. LONG BEACH, Calif.
The process sends an electrical charge through seawater flowing through tanks on the barge. That then sets off a series of chemical reactions that trap the greenhouse gas into a solid mineral that includes calcium carbonate — the same thing seashells are made of. The seawater is then returned to the ocean and can pull more carbon dioxide out of the air.
Sant doesn’t disagree. Scientists estimate at least 10 billion metric tons of carbon will need to be removed from the air annually beginning in 2050, and the pace will need to continue over the next century.That’s why the success of any of the technologies will rely on “how fast you can build them out,” he added.
Among the ideas researchers are looking at is fertilizing the surface of the ocean to cause a proliferation of tiny carbon-absorbing phytoplankton. Another would sprinkle beaches with minerals that could be slowly swept in with the tides or deposited on coast beds to increase seawater’s alkalinity so it can pull more carbon dioxide from the atmosphere.
To remove a metric ton of carbon dioxide, about 220 metric tons of water needs to flow through the system. That produces 35 kilograms of hydrogen, Sant said.
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