Captura Publishes Protocol For Its Ocean Carbon Removal Technology

Captura Publishes Protocol For Its Ocean Carbon Removal Technology - Carbon Herald
Credit: Captura

Captura – an ocean carbon dioxide removal (CDR) technology startup, has published a protocol for its CDR approach titled: Carbon Dioxide Removal Pathway – an MRV and Ocean Health.

The 18-page document aims to provide a description of Captura’s practices for ensuring the safety of its operations for the marine ecosystem. It includes detailed environmental monitoring plans that evaluate the impact of its technology using the best available information and outlines the identified potential co-benefits and risks of the technology, with mitigation pathways and plans.

Relevant: “There Really Isn’t A Limit To Captura’s Carbon Removal Capacity” – CEO Steve Oldham

The document also describes the monitoring, reporting, and verification (MRV) protocol for the Direct Ocean Capture (DOC) technology of Captura for marine carbon dioxide removal (mCDR). Included are the pilot testing results. The document aims to provide transparency and accountability of its approach and invites feedback to be sent to According to the document, it will be revisited and updated when new information is available at least every six months.

Captura’s approach is based on Henry’s law. It takes CO2 directly from the seawater, which then creates an imbalance and per Henry’s law, the ocean will continue to draw down CO2 from the atmosphere to make up for the lost amount.

The technology works as a small percentage of the ocean water that goes through Captura’s plant, is taken out and treated through its electrodialysis process. 

Rendering of a large-scale Captura facility. Credit: Captura Corporation

The electrodialysis dissociates the molecules within saltwater- sodium chloride, salt, and H2O and moves them. Instead of sodium chloride and water, it forms them into an acid and a base of alkali. The acid is put into the flow of ocean water that goes through the plant and acidifies it. That process forces the CO2 to bubble out. The gas is then collected and can be sequestered or turned into products. The alkali is also put back in the water which makes it almost neutral. 

The goal of the deployment of the technology at large scale is to have no net harm to the local ecosystems. 

Captura has recently announced its partnership with Deep Sky to install a 100-ton pilot in eastern Quebec, Canada in Q3 2024. It will be deploying a 1000-ton pilot plant with the location expected to be announced in November 2023. Next on the plant pipeline is its first commercial facilities to be operational by 2026. The technology can be built as dedicated platforms or can make use of existing infrastructure.

Relevant: Captura And Deep Sky To Install Ocean Carbon Removal Pilot In Canada

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