Ocean Deacidification Technologies for Marine Aquaculture

The increase in partial pressure of CO2 in the oceans directly affects the productivity and survival of coastal industries and ecosystems. For marine aquaculture, the decreased alkalinity of seawater results in reduced availability of carbonates for marine organisms to build their shells, leading to...

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Bibliographic Details
Published in:Journal of marine science and engineering 2022-04, Vol.10 (4), p.523
Main Authors: Myers, Christopher R., Subban, Chinmayee V.
Format: Article
Language:English
Subjects:
Acidification
Algae
Alkalinity
Alternative energy sources
Aquaculture
Aquaculture techniques
Bicarbonates
Carbon dioxide
Carbon dioxide removal
Carbon sequestration
Carbonates
CO2 removal
Deacidification
Emissions
ENGINEERING
Equilibrium
Fish
Industry
Marine aquaculture
marine carbon capture
Marine ecosystems
Marine organisms
Marine technology
mCDR
Modular design
Oceans
Partial pressure
Productivity
R&D
Recirculating aquaculture systems
Research & development
Seawater
Shellfish
Survival
Sustainability
Sustainable aquaculture
Technology adoption
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Summary:The increase in partial pressure of CO2 in the oceans directly affects the productivity and survival of coastal industries and ecosystems. For marine aquaculture, the decreased alkalinity of seawater results in reduced availability of carbonates for marine organisms to build their shells, leading to decreased aquaculture quality and productivity. The industry has been implementing recirculating aquaculture systems (RASs) to reduce CO2 in feedwaters, but recent interest in ocean-based CO2 capture has led to additional strategies that may be relevant. The new methods in addition to CO2 removal offer capture options for enhanced aquaculture sustainability. Here, we review and compare early-stage and commercially available technologies for deacidification of seawater and their suitability for aquaculture. Most methods considered rely on a voltage-induced pH swing to shift the carbonate/bicarbonate equilibrium toward the release of CO2, with subsequent capture of the released CO2 as a gas or as solid mineral carbonates. The modular design and distributed deployment potential of these systems offers promise, but current demonstrations are limited to bench scale, highlighting the need for sustained research and development before they can be implemented for marine aquaculture.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10040523