Seawater intrusion is a worldwide increasing challenge, which lowers the freshwater availability by salination of fresh groundwater resources in coastal areas. The abstraction-desalination-recharge (ADR) methodology can combat seawater intrusion, whereby desalination is hereby the key factor for the overall efficiency of aquifer remediation. Which desalination technique is suitable within ADR depends on several factors and was not discussed before. We use a multi-criteria decision analysis and cost analysis to compare nanofiltration, reverse osmosis, electrodialysis, and (membrane) capacitive deionization and show for three case scenarios which desalination technique is most suitable within ADR. Overall, electrodialysis, nanofiltration, and reverse osmosis have shown the best utility value for saline groundwater salinity of 1–10 g L⁻¹, whereby electrodialysis is more suitable for lower salinities. The lowest desalination costs are calculated for nanofiltration and reverse osmosis with 0.3–0.6 € m⁻³ depending on specific energy costs. Even capacitive deionisation can be a suitable alternative for low, slightly saline groundwater (1 g L⁻¹) if the technology readiness level and a lifetime of electrodes increase and material costs decrease. These new insights provide a data analysis, costs, and decision support for desalination which are needed for the holistic approach to counteract seawater intrusion.

海水入侵是一个世界范围内日益严峻的挑战，它导致沿海地区地下水资源盐碱化，从而降低了淡水的供应量。抽取-海水淡化-补给（ADR）方法可以对抗海水入侵，因此海水淡化是含水层修复整体效率的关键因素。 ADR 中适合哪种海水淡化技术取决于几个因素，之前没有讨论过。我们使用多标准决策分析和成本分析来比较纳滤、反渗透、电渗析和（膜）电容去离子，并针对三种情况展示哪种海水淡化技术最适合 ADR。总体而言，电渗析、纳滤和反渗透对于1-10 g L ^-1的含盐地下水表现出最佳的利用价值，因此电渗析更适合较低盐度的情况。根据具体的能源成本，纳滤和反渗透的最低海水淡化成本为 0.3–0.6 € m ^-3 。如果技术准备水平和电极寿命增加并且材料成本降低，那么即使是电容去离子也可以成为低盐度地下水（1 g L ^-1 ）的合适替代方案。这些新见解为海水淡化提供了数据分析、成本和决策支持，这是对抗海水入侵的整体方法所需要的。