Here are some ways to recover carbon dioxide (CO2) from the ocean:

 Here are some ways to recover carbon dioxide (CO2) from the ocean:

Electrolysis

This process uses an electric current to separate CO2 from seawater: 

Pass an electric current through seawater between two electrodes 

The current generates chemical reactions that separate the CO2 

The CO2 is extracted and confined 

The water is alkalinized and discharged 

Hydrolytic softening

This process is similar to water treatment facilities, but instead of using lime, it decomposes calcium carbonate to release CO2. 

Electrochemical ocean carbon dioxide removal

This process uses electricity to create an acidic stream that removes CO2 from seawater. The acidic stream can be used to store or use the CO2, or to weather alkaline rocks. 

Direct ocean capture (DOC)

This process draws in seawater, separates 1% of it for conversion to brine, and passes the brine through an electrodialysis machine. 

Ocean biomass sequestration

This process involves phytoplankton absorbing CO2, which are then eaten by smaller species, and then larger species. The carbon sinks into the deep ocean through excretion and death. 

Carbon sequestration is an important technology for mitigating climate change by maintaining the right level of CO2 in the atmosphere.