铸铁管管垢表界面自由基介导的DBPs生成转化机制

供水管网因覆盖面广、系统复杂等特点成为保障龙头水安全的薄弱环节，明晰消毒副产物在输配过程中的生成转化规律是饮用水安全保障面临的难题。本项目重点关注铸铁管管垢表界面自由基介导的消毒副产物生成转化机制。基于管垢表面形貌、孔隙结构、比表面积、元素组成等物理化学表征，研究管垢理化特性与天然有机物吸附行为之间的构效关系；结合仪器分析和自由基猝灭实验，探究管垢表界面活性自由基生成规律，揭示自由基介导下消毒副产物生成转化机制；通过模型化合物在管垢表面的反应过程和同位素示踪，系统解析未关注的自由基过程与已知的氢解和α-消除之间的作用关系；参照实际供水过程的复杂环境，考察pH、温度、流速、共存离子等对消毒副产物形成转化的影响；最后评估管垢作用下形成的消毒副产物对水质毒性的潜在风险。为保障饮用水输配过程的水质安全提供理论基础。

Water distribution system (WDS) is a basic yet very crucial unit in ensuring the safety of tap water due to its wide use and complex pipeline network. The disinfection byproducts (DBPs) formed in WDS is a major issue for drinking water safety. This project will focus on the role of free radicals generated from iron corrosion scales in the formation and conversion of DBPs, which leads to the secondary pollution in drinking water. Based on the characterizations of surface morphology, pore structure, specific surface area and element composition, etc, the structure-activity relationship between the physicochemical properties of iron corrosion scales and the adsorption behavior of natural organic matter will be established. Combined with the results of instrumental analysis and quenching experiments, the generation mechanism of active radicals and its influence on the DBP formation in the microenvironment of iron corrosion scales. In addition, with the help of the reaction pathways of model compounds and the tracing of isotope-labelled compounds, the correlation between the unconcerned free radical oxidation and the known hydrogenolysis and α-elimination in the DBP formation at iron corrosion scales will be systematic clarified. Moreover, according to the complex environment of the actual WDS, the effect of pH, temperature, flow rate and coexisting ions on DBP formation will be clarified. Finally, the potential risk of DBP formation under the reaction of iron corrosion scales on the water quality needs to be assessed. Overall, this project aims to provide a theoretical support for ensuring the water quality safety problems in the water distribution system.