Groundwater is the most widely used water resource worldwide. In addition to natural underground pollutants, it is also affected by anthropogenic pollution sources. Highly soluble nitrate can easily leak into groundwater via precipitation. Nitrate has the potential to produce nitrosamines and thus can cause blue baby syndrome as well as several types of cancer, including that of the digestive system. Moreover, nitrates lead to eutrophication in bodies of water such as rivers and lakes. Therefore, organizations such as the World Health Organization (WHO) and the US Environmental Protection Agency (EPA) have limited the maximum acceptable nitrate concentration in drinking water to 10 mg/L. These adverse effects make it necessary to remove nitrates from water. The membrane capacitive deionization (MCDI) process can successfully remove nitrate. In this study, solutions with different concentrations of nitrate were treated via MCDI at different removal efficiencies, resulting in nitrate reductions below the limit values. Thus, the MCDI process proved to be an economical treatment approach, and during the treatment phase no significant effect of nitrate concentration levels was observed on the recovery efficiency. During the MCDI treatment, the electrodes accepted the SO₄²⁻ and NO₃⁻ ions approximately equally, while Cl⁻ removal rate was lower. Groundwater obtained from the Meric district of Edirne (Turkey) containing 233 mg/L nitrate was successfully purified via the MCDI process, with a nitrate removal efficiency of 98%. The energy expenditure calculated for the nitrate removal treatment of the groundwater was 0.4 kWh/m³.

地下水是全世界使用最广泛的水资源。除自然地下污染物外，还受到人为污染源的影响。高溶解度的硝酸盐很容易通过沉淀泄漏到地下水中。硝酸盐有可能产生亚硝胺，因此可能导致蓝婴综合症以及多种癌症，包括消化系统癌症。此外，硝酸盐会导致河流和湖泊等水体富营养化。因此，世界卫生组织（WHO）和美国环境保护署（EPA）等组织将饮用水中硝酸盐最大可接受浓度限制为10毫克/升。这些不利影响使得有必要从水中去除硝酸盐。膜电容去离子（MCDI）工艺可以成功去除硝酸盐。在这项研究中，不同浓度的硝酸盐溶液通过 MCDI 以不同的去除效率进行处理，导致硝酸盐减少到极限值以下。因此，MCDI 工艺被证明是一种经济的处理方法，并且在处理阶段没有观察到硝酸盐浓度水平对回收效率的显着影响。在MCDI处理期间，电极大致相等地接受SO ₄ ²⁻和NO ₃ ^{-离子，而Cl -}去除率较低。土耳其埃迪尔内梅里克地区含有233 mg/L硝酸盐的地下水通过MCDI工艺成功净化，硝酸盐去除率达到98%。计算出地下水去除硝酸盐处理的能量消耗为0.4kWh/m ³。