Direct Ocean Carbon Capture Technology for Industrial Infrastructure

Achieving carbon neutrality requires efficient and scalable carbon dioxide removal systems. While direct air capture methods face limitations due to the relatively low concentration of carbon dioxide in the atmosphere, oceans act as natural carbon sinks, absorbing gas based on concentration differentials. Seawater contains approximately 140 times the concentration of dissolved inorganic carbon compared to an equivalent volume of air, making it a highly efficient medium for extraction.

However, extracting this carbon reliably and economically without damaging marine ecosystems has historically posed significant technical and operational hurdles for environmental engineering firms, particularly regarding energy consumption and initial equipment costs.

Acidification-Based Direct Ocean Capture Technology
To address these limitations, Mitsubishi Electric Corporation, a developer of sustainable industrial technologies, collaborated with the VTT Technical Research Centre of Finland to design a foundational Direct Ocean Capture system. The engineering teams selected an acidification approach over conventional base-catalyzed mineral carbonate precipitation methods.

The chosen method introduces hydrogen ions into captured seawater to temporarily elevate its acidity, causing the dissolved inorganic carbon to convert into gaseous carbon dioxide. Extracting the carbon in a gaseous state simplifies its subsequent utilization or sequestration. This choice facilitates both carbon capture and storage alongside carbon capture and utilization pipelines, allowing the recovered gas to be synthesized into industrial raw materials or synthetic fuels more efficiently than solid carbonate minerals.

Integration with Existing Marine Infrastructure and Resource Recovery
A key consideration during the development phase was reducing the capital expenditure typically associated with scaling new environmental technologies. The system architecture was engineered specifically for seamless integration into existing industrial facilities that feature large-scale seawater intake infrastructure, such as desalination plants and coastal power stations. This approach eliminates the need to construct dedicated, high-cost maritime pumping stations, thereby optimizing raw material efficiency and reducing overall energy consumption per ton of captured carbon.

Additionally, the process incorporates a mechanism designed to extract valuable mineral resources dissolved in the processed seawater. By capturing these secondary raw materials during the carbon extraction cycle, the system introduces a diversified revenue model that enhances the long-term commercial viability and profitability of the industrial operation.

Technical Validation and Commercial Deployment Strategy
With the foundational technical validation completed, the development process shifts toward field testing. The data accumulated during laboratory testing confirmed the viability of the gas-stripping acidification process. To accelerate deployment, the collaborative framework aims to establish new partnerships for coastal field trials, focusing on verifying system durability, adjusting automated flow controls under variable marine conditions, and refining the environmental safety protocols required for large-scale commercial application.

Edited by Maria Brueva, Induportals editor – adapted by AI.

www.mitsubishielectric.com