Based on our research into ocean-based carbon removal companies, this article discusses industrial Direct Ocean Capture (DOC) technologies based on electrodialysis.
Electrodialysis is a mature technology that is widely used for desalinating brackish water to produce potable water. It is employed for re-demineralization of boiler feed, desalination of contaminated industrial water, and in the production of ultrapure water through electrodeionization.
Bipolar membrane electrodialysis (BMED) can use seawater to produce acidic (e.g., HCl) and alkaline (e.g., NaOH) solutions. The acid solution is used to extract COâ‚‚ directly from the seawater. The base solution is safely added to seawater to enhance the local alkalinity, thus accelerating the absorption of atmospheric COâ‚‚.
Electrolytic electrodialysis technology uses less membranes compared to BMED. This reduces electrical resistance and enables a high production rate of acid and base streams. Moreover, electrolytic electrodialysis produces valuable hydrogen byproducts.
(This article contains 5 diagrams and 1275 words.)
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