饮用水离子交换处理过程中有机氮副产物的形成机理与调控方法研究

随着人们对饮用水水质要求的提高，离子交换树脂越来越广泛地用于深度处理饮用水。然而，阴离子交换树脂处理饮用水过程中会形成亚硝胺等有机氮副产物，对人体健康产生威胁。本项目以降低离子交换处理饮用水过程中有机氮副产物的产生量和生物毒性为目标开展研究。首先研究影响有机氮副产物形成的关键因素及其动力学；其次，定性定量分析离子交换处理饮用水过程中形成的有机氮副产物种类与浓度，结合离子交换树脂表面物化参数及表观形貌的变化，揭示有机氮副产物生成与转化的机制；再次，分析已形成的有机氮副产物在后续消毒过程的反应产物及其生物毒性，阐明其转化路径；在上述研究基础上，提出减少有机氮生成、控制有机氮在消毒过程转化的调控方法。本项目研究成果将丰富离子交换法深度处理饮用水理论，为减少饮用水处理副产物、提高饮用水质量提供基础性支持。

Anion exchange resins are another group of drinking water treatment polymers and are commonly used for the removal of anionic contaminants during drinking water treatment. However, early studies found that anion exchange resins used in drinking water systems released organic nitrogen compounds, such as carcinogenic nitrosamines, which have cancer risk concentrations at low ng/L in drinking water. The goal of this work is to reduce organic nitrogen compounds formation and toxicity in the treatment of drinking water by anion exchange. Firstly, the individual effects of the process parameters on organic nitrogen compounds release will be assessed. Then the species and concentration of organic nitrogen compounds will be identified; the physicochemistry and morphology of anion exchange resins will be characterized. Based on the above results, the formation pathways of organic nitrogen compounds will be proposed. Next, the transformation products and their toxicity of organic nitrogen compounds during disinfection will be analyzed to elucidate the transformation pathways. Finally, the methods to limit the organic nitrogen compounds formation and toxicity in the treatment of drinking water by anion exchange will be proposed. Obtained results in the current work will not only add some information in the field of application of the anion exchange in drinking water treatment but also provide basic support for reducing the byproducts and improving the quality of drinking water.