A fresh approach to maritime emissions
Calcarea dazzled a global audience during Hong Kong Maritime Week by taking first prize at the Captain Table, the well regarded startup pitch event transmitted by Splash. The young company convinced an experienced judging panel that its shipboard carbon capture solution can fit smoothly into daily vessel operations while saving space and cost.
Technology turning exhaust into ocean compatible bicarbonate
At the core of the proposal is accelerated limestone weathering performed inside compact reactors that fit within existing engine room footprints. Limestone loaded alongside other dry cargo reacts with exhaust carbon dioxide while the vessel is underway. The chemistry transforms gas into bicarbonate ions which are already abundant in seawater. Because bicarbonate dissolves harmlessly the crew avoids the logistical challenge of storing or discharging solid carbon after every voyage.
Advantage for fleet managers
By eliminating specialised shore infrastructure Calcarea enables shipowners to scale carbon capture on individual vessels without waiting for port upgrades. The reactors are modular so retrofits align with regular dry docking schedules. Judges highlighted the commercial relevance because shipping companies can begin lowering regulated emissions now and earn potential carbon credits while continuing to burn conventional fuels within current engines.
A wider climate implication
A less discussed benefit is that producing bicarbonate gently increases local seawater alkalinity. Scientific studies suggest higher alkalinity may help neutralise ocean acidification, offering a dual climate advantage beyond direct carbon removal. If verified at scale merchant fleets could collectively contribute to healthier marine ecosystems while meeting decarbonisation targets.
Prize and next steps
As winner Calcarea secured thirty thousand dollars in cash plus legal support valued at twenty five thousand pounds from long standing partner HFW. All finalists are also being considered for additional investment from Portline Group. The fresh capital will accelerate prototype deployment and pave the way for the first commercial installation before the end of the decade.
Conclusion
Calcarea presents a realistic path for immediate maritime decarbonisation by blending proven chemistry with daily operations. The concept promises lower emissions, simpler logistics, and a subtle boost for ocean health, marking a leap toward climate positive shipping.