Wang Jiajie, Sekiai Ryota, Tamura Ryota, Watanabe Noriaki
Department of Environmental Studies for Advanced Society, Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan.
Sci Adv. 2024 Nov 15;10(46):eadq0515. doi: 10.1126/sciadv.adq0515.
Geological storage and mineralization of CO in mafic/ultramafic reservoirs faces challenges including limited effective porosity, permeability, and rock reactivity; difficulties in using seawater for CO capture; and uncontrolled carbonation. This study introduces a CO capture, storage, and mineralization approach with the utilization of biobased biodegradable chelating agents and seawater. An acidic chelating agent solution is used to increase effective porosity and permeability through enhanced mineral dissolution. For instance, applying an acidic ,-Bis(carboxymethyl)--glutamate solution to a porous basalt increased effective porosity by 16% and permeability by 26-fold in 120 hours. Subsequently, alkaline chelating agent-containing seawater improves CO capture and storage by inhibiting mineralization, thus maintaining injectivity while providing ions for mineralization and further expanding storage space. Last, controlled mineralization is achieved by adjusting chelating agent biodegradation. Promising CO storage and mineralization capacities two orders higher than current techniques, this approach reduces required reservoir volume while enhancing efficiency.
镁铁质/超镁铁质储层中二氧化碳的地质储存和矿化面临诸多挑战，包括有效孔隙度、渗透率和岩石反应性有限；使用海水进行二氧化碳捕集存在困难；以及碳酸化不受控制。本研究介绍了一种利用生物基可生物降解螯合剂和海水的二氧化碳捕集、储存和矿化方法。酸性螯合剂溶液用于通过增强矿物溶解来增加有效孔隙度和渗透率。例如，将酸性的β-双（羧甲基）-L-谷氨酸溶液应用于多孔玄武岩，在120小时内有效孔隙度增加了16%，渗透率提高了26倍。随后，含碱性螯合剂的海水通过抑制矿化来改善二氧化碳的捕集和储存，从而在为矿化提供离子并进一步扩大储存空间的同时保持注入性。最后，通过调节螯合剂的生物降解实现可控矿化。这种方法的二氧化碳储存和矿化能力比现有技术高出两个数量级，在提高效率的同时减少了所需的储层体积。
