Water sustainability is at the core of high-tech industries and reflects their efforts in terms of both economic and environmental benefits. In this study, a membrane capacitive deionization (MCDI)-based water treatment system was proposed for the production of ultrapure water and wastewater reclamation by deionization. The system achieved good deionization performance in single-pass mode for treating soft tap water (T1), hard tap water (T2), cooling tower blowdown (W1) and wastewater discharge from high-tech industries. Overall, the removal efficiencies for hardness and conductivity in the tested scenarios were at least 70.8% and 51.9%, respectively, and selectivity in ion removal was the highest in Na⁺ for T1, W1 and W2 and in Ca²⁺ for T2, as it was mainly affected by the initial molar concentration of major ions. The system also showed favorable characteristics of high charge efficiency and relatively low energy consumption. At an applied voltage of 1.6 V, the energy requirements vary from 0.014 to 0.68 kWh/m³ with a charge efficiency higher than 70%, while the optimal deionization time was estimated to be between 12 and 60 min considering the increase in both the mean deionization rate and mean deionization capacity for various feedwater scenarios. The levelized cost of water for the studied MCDI scenarios ranges from 0.35 to 0.53 $USD/m³, in which the capital and material costs generally outweigh the energy and other operational costs. The results of this study are expected to provide essential techno-economic recommendations for the practical adoption of the on-site MCDI process in industries.

水资源可持续性是高科技产业的核心，反映了他们在经济和环境效益方面的努力。在这项研究中，提出了一种基于膜电容去离子 (MCDI) 的水处理系统，用于生产超纯水和通过去离子进行废水回收。该系统在单程模式下对软自来水（T1）、硬自来水（T2）、冷却塔排污（W1）和高新技术行业废水的处理均取得了良好的去离子性能。总体而言，在测试场景中硬度和电导率的去除效率分别至少为 70.8% 和 51.9%，并且离子去除选择性最高的是 T1、W1 和 W2 的Na ⁺和 Ca ²⁺对于 T2，因为它主要受主要离子的初始摩尔浓度影响。该系统还表现出充电效率高、能耗相对较低的良好特性。在 1.6 V 的施加电压下，能量需求从 0.014 到 0.68 kWh/m ³不等，充电效率高于 70%，而考虑到平均值的增加，最佳去离子时间估计为 12 到 60 分钟各种给水方案的去离子率和平均去离子能力。所研究的 MCDI 情景的平准化水成本范围为 0.35 至 0.53 美元/m ³，其中资本和材料成本通常超过能源和其他运营成本。这项研究的结果有望为工业现场 MCDI 过程的实际采用提供必要的技术经济建议。