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Advances in Earth Science >

2025 , Vol. 40 >Issue 1: 68 - 81

DOI: https://doi.org/10.11867/j.issn.1001-8166.2024.087

Ocean Alkalinity Enhancement Technology and Outlook of Synergistic Application Pathways: A Review

  • Baorong HUANG ,
  • Zhe ZHOU ,
  • Huaqiang CHU ,
  • Chaomeng DAI ,
  • Shouye YANG ,
  • Yalei ZHANG
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  • 1.College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    2.State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, China
    3.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
    4.School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
    5.College Civil Engineering, Tongji University, Shanghai 200092, China
HUANG Baorong, research areas include environmental geochemistry and water pollution control. E-mail: hbr@tongji.edu.cn
ZHOU Zhe, research area includes ocean biogeochemical research. E-mail: zhezhou_research@tongji.edu.cn

Received date: 2024-10-25

  Revised date: 2024-12-23

  Online published: 2025-03-24

Supported by

the National Key Research and Development Program of China(2022YFF0800504);The Interdisciplinary Project of Tongji University(2023-1-YB-04);The National Natural Science Foundation of China(42306052)

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Abstract

Carbon neutrality is a crucial strategy for combating global warming, and negative emissions technologies are key to achieving this goal. As the largest carbon reservoir on Earth, the ocean plays an irreplaceable role in regulating global carbon cycling and holds significant potential for negative emissions. Ocean alkalinity enhancement is a highly efficient and ecologically beneficial negative emissions technology. This technology increases ocean alkalinity by adding alkaline minerals to seawater, thereby enhancing the absorption of atmospheric CO2 and improving the buffer capacity to resist ocean acidification. This study introduces the mechanisms and advancements in ocean alkalinity enhancement research at multiple scales based on the dissolution theory of carbonates in the ocean. Assessing the potential for negative emissions and associated costs reveals several challenges regarding implementation pathways, environmental impacts, and public acceptance. Considering the specific conditions of China’s coastal regions and the characteristics of ocean alkalinity enhancement technology, this study proposes a pathway integrated with wastewater treatment plants and coastal engineering. Furthermore, it provides an innovative concept on the application of ocean alkalinity enhancement and enriches the scientific understanding of blue carbon sinks.

Key words： Carbon neutrality; Ocean negative carbon emissions; Alkalinity enhancement; Wastewater treatment plant; Coastal engineering

Cite this article

Baorong HUANG , Zhe ZHOU , Huaqiang CHU , Chaomeng DAI , Shouye YANG , Yalei ZHANG . Ocean Alkalinity Enhancement Technology and Outlook of Synergistic Application Pathways: A Review[J]. Advances in Earth Science, 2025 , 40(1) : 68 -81 . DOI: 10.11867/j.issn.1001-8166.2024.087

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