Reactions of chlorine dioxide with nitrogen-containing pollutants in water treatment: Mechanism and product formation

水处理中二氧化氯与含氮污染物的反应：机理和产物形成

• 批准号: 519103703
• 负责人: Professor Dr. Holger Lutze
• 金额: --
• 依托单位: Bundesanstalt für Gewässerkunde (BfG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/519103703?language=en
• 关键词: Reactions; chlorine; dioxide; nitrogen; containing

Chlorine dioxide (ClO2) is widely used in water treatment as disinfectant and oxidant for pollutant control. However, major aspects of its reaction mechanisms are yet unclear. Recently, it was reported that ClO2 may form free available chlorine as secondary oxidant which may affect, by-product- and transformation product formation as well as oxidation of pollutants. The present proposal deals with the reaction of ClO2 with N-containing pollutants which represent a large fraction of pollutants in the aquatic environment. The aim of the planned work is to understand the elementary steps of the reaction of ClO2 with model compounds for prediction of the behaviour of more complex pollutants in ClO2 based processes. Thereby, formation of secondary oxidants (e.g., free available chlorine) and inorganic chlorine species, reaction kinetics and transformation product formation as well as fundamental aspects such as the influence of oxygen will be investigated. Based on these investigations, reaction mechanisms will be established and used to predict the degradation efficiency and transformation product formation of complex model compounds. These predictions will be compared with experimental data on product formation from experiments with complex N-containing micropollutants in defined solutions and real water systems. The present proposal strives to improve the overall understanding of ClO2 reactions in water treatment, which will result in significant advances in the scientific field of water chemistry and water treatment. It will also be very useful to improve ClO2 based water treatment regarding predictions on degradation efficiency of pollutants and by- and transformation product formation of N-containing compounds.

二氧化氯（ClO2）作为消毒剂和氧化剂广泛应用于水处理中以控制污染物。然而，其反应机制的主要方面还不清楚。最近，据报道ClO2可形成游离有效氯作为二次氧化剂，其可影响副产物和转化产物的形成以及污染物的氧化。本提案涉及二氧化氯与含氮污染物的反应，含氮污染物在水环境中占很大比例。计划工作的目的是了解ClO2与模型化合物反应的基本步骤，以预测ClO2工艺中更复杂污染物的行为。从而，形成二次氧化剂（例如，游离有效氯）和无机氯物种、反应动力学和转化产物形成以及基本方面如氧的影响将被研究。基于这些研究，将建立反应机理，并用于预测复杂模型化合物的降解效率和转化产物的形成。这些预测将与实验数据进行比较，从实验中确定的解决方案和真实的水系统中的复杂的含氮微污染物的产品形成。本提案旨在提高对水处理中ClO2反应的整体理解，这将导致水化学和水处理科学领域的重大进展。它也将是非常有用的，以改善二氧化氯为基础的水处理有关预测的降解效率的污染物和由和转化产物的形成含N化合物。