Project SeaCURE: A New Frontier in Ocean-Based Carbon Capture

1. The ocean acts as a major natural carbon sink, absorbing a significant portion of CO₂ emissions from human activities.
2. Project SeaCURE, based on England’s south coast, aims to enhance this natural process through active intervention.
3. It seeks to transform the ocean from a passive absorber into a proactive tool for addressing climate change.

What is Project SeaCURE?

1. Location: The project is based in Weymouth, England.
2. Objective: To explore whether extracting CO₂ from seawater is a scalable and cost-effective method to reduce atmospheric carbon.
3. It targets CO₂ already dissolved in seawater, which is far more concentrated than in the atmosphere.
4. The approach focuses on returning treated, carbon-depleted water back to the ocean to absorb more atmospheric CO₂.

How the Technology Works

1. Seawater is pumped into a treatment facility from the English Channel.
2. The water is made more acidic, triggering the release of dissolved carbon dioxide (CO₂) as gas.
3. The released CO₂ is captured before it can escape into the air.
4. The captured CO₂ can potentially be purified using activated carbon during post-processing to remove impurities.
5. The treated seawater is neutralised and returned to the ocean, enabling it to absorb more atmospheric CO₂.

Current Impact

1. The pilot project currently removes a modest amount of carbon dioxide (CO₂) annually, demonstrating the feasibility of the concept.
2. SeaCURE’s model shows potential for scaling up CO₂ removal using renewable energy sources, such as floating solar panels.

Challenges and Environmental Concerns

1. The process requires significant energy to create the required chemical conditions.
2. If powered by non-renewable energy sources, the process may reduce or negate its environmental benefits.
3. There is a risk of disrupting the ocean’s natural carbon balance.
4. Marine organisms, such as phytoplankton and shell-forming species (e.g., corals, mussels), may be affected by changes in available CO₂ and pH (potential of Hydrogen).
5. Activated carbon, although not used directly in the extraction process, may be applied in water treatment to meet environmental discharge standards.

Context: Ocean Acidification

1. Oceans are becoming more acidic due to carbon dioxide (CO₂) absorption, a trend known as ocean acidification.
2. Even slight shifts in pH (potential of Hydrogen) can have serious impacts on marine life, especially shell-forming organisms such as corals, mussels, and some types of plankton.
3. SeaCURE places a strong emphasis on balancing CO₂ removal with the need to preserve ocean chemistry and ecological health.

Broader Relevance and Future Potential

1. SeaCURE is one of several early-stage projects testing new carbon dioxide removal (CDR) methods.
2. Experts view such innovations as essential for achieving global net-zero climate goals, where the amount of greenhouse gases emitted is balanced by the amount removed from the atmosphere.
3. Activated carbon plays a supporting role in other carbon dioxide removal (CDR) technologies, such as air purification and Bioenergy with Carbon Capture and Storage (BECCS), demonstrating its versatility.
4. If successful, SeaCURE could become a model for sustainable, ocean-based carbon capture strategies.
5. Projects like SeaCURE signify a shift from passive carbon absorption to active climate action using marine systems as a proactive tool in climate mitigation.