Zheng Li-Wen, Hu Yubin, Su Bei, Chen Qian-Ying, Liu Jihua
Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China.
Global Ocean Negative Carbon Emissions (ONCE) Program Alliance, Qingdao, China.
Sci Adv. 2025 May 2;11(18):eads0313. doi: 10.1126/sciadv.ads0313.
Ocean alkalinity enhancement (OAE) implemented through wastewater treatment plants increases the alkalinity of the effluents and discharges them into the ocean, referred to as wastewater-based OAE. However, the alkalization capability and its carbon storage stability when adding alkaline minerals to wastewater treatment are uncertain. In this study, total alkalinity was enhanced to more than 10 millimoles per kilogram and phosphate removal was improved when we added olivine to wastewater in a laboratory setting. The alkalization rate by olivine dissolution in aerobically treated wastewater was 20 times higher than in seawater. We estimated the potential of carbon sequestration through wastewater-based OAE to be 18.8 ± 6.0 teragrams of CO per year globally, with notable potential in the 20°N to 60°N region.
通过污水处理厂实施的海洋碱度增强（OAE）可提高废水的碱度并将其排放到海洋中，这被称为基于废水的OAE。然而，在废水处理中添加碱性矿物质时的碱化能力及其碳储存稳定性尚不确定。在本研究中，我们在实验室环境中向废水中添加橄榄石时，总碱度提高到了每千克超过10毫摩尔，同时磷去除效果也得到了改善。橄榄石在好氧处理废水中的溶解碱化速率比在海水中高20倍。我们估计，全球通过基于废水的OAE进行碳封存的潜力为每年18.8±6.0太克二氧化碳，在北纬20°至60°地区具有显著潜力。
