基于钙添加的海水无机碳移除的增汇潜力研究

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Abstract This study explored the potential of introducing Ca²⁺ into seawater to remove dissolved inorganic carbon and enhance the oceanic carbon sink. Laboratory simulations under various initial conditions were conducted, by altering the initial pH of seawater, Mg/Ca ratio, and introducing seeding nuclei, monitor the changes in seawater pH, DIC, and TA regularly. Results indicated that the introduction of Ca²⁺ effectively reduced the magnesium-to-calcium ratio(5.2) in natural ocean and increased the oversaturation of calcium carbonate, thereby facilitating the removal of inorganic carbon from the marine system. Furthermore, the efficacy of inorganic carbon removal with calcium-containing compounds was positively correlated with the initial pH of seawater. However, solely elevating seawater pH was insufficient to induce calcium carbonate formation; additional Ca²⁺ introduction was necessary to enhance calcium carbonate oversaturation for significant inorganic carbon removal. Additionally, the study revealed that inducing non-homogeneous precipitation through the addition of specific nuclei further promotes calcium carbonate generation, thereby improving inorganic carbon removal from seawater.The research findings indicated that under the conditions of adding 45mmol/L of Ca²⁺ and montmorillonite nuclei, with an initial pH of 8.5, the maximum amount of calcium carbonate generated can reach 959 μmol/L. The removal of inorganic carbon from seawater, leading to the short-term absorption of atmospheric CO₂and increased oceanic carbon sink, offers a novel perspective and theoretical foundation for exploring ocean carbon enhancement technologies.

Key words： seawater inorganic carbon calcium carbonate precipitation seawater carbon removal ocean carbon sink

Received: 21 February 2024

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X145

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	Articles by authors
	LI Shuo-chen
	LI Xue-gang
	HE Zhi-peng
	SONG Jin-ming
	LIU Shan-shan
	WANG Zhi-bo

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LI Shuo-chen,LI Xue-gang,HE Zhi-peng等. Studies on the potential of inorganic carbon removal and carbon sequestration in seawater through Ca²⁺ addition[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5912-5920.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I10/5912

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