Influence of organic matter on transformation processes

几十年来，氧化工艺被用于水处理中的消毒和污染物控制。在过去的几年中，氧化技术，如臭氧化也被用于废水处理中的污染物降解。然而，污染物不是矿化的，而是在氧化时形成转化产物。转化过程非常复杂，通常在纯水体系中进行研究。然而，真实的沃茨的主要基质化合物，如天然有机物（NOM），可能会对这些转化过程产生影响。一种可能性是在这些转化过程中形成的活性中间体也可能与NOM反应。然而，NOM对产物形成的影响在很大程度上是未知的。本论文的研究重点是NOM与臭氧化反应中可能形成的活性中间体的反应。所研究的活性中间体是在臭氧和羟基自由基反应中形成的N-中心自由基。在本项目的早期阶段，将研究活性中间体与模型化合物的反应。这些模型化合物类似于有机物的典型官能团，如酚类化合物。以后将研究更复杂的系统，如腐殖酸或有机物分离物。该提案将提高对真实的沃茨水域中基于臭氧的转化过程的了解，并有助于更好地评估是否可能形成有害的转化产物。

Oxidation processes are used in water treatment for disinfection and pollutant control since several decades. In the past years oxidation techniques such as ozonation are also used in wastewater treatment for pollutant degradation. However, pollutants are not mineralized but form transformation products upon oxidation. The transformation processe are very complex and often investigated for pure water systems. However main matrix compounds of real waters such as natural organic matter (NOM) may have an effect on these transformation processes. One possibility is that reactive intermediates formed in these transformation processes may also react with NOM. Yet, influence of NOM on product formation is largely unknown. The present proposal is focusing on the reactions of NOM with reactive intermediates which could be formed in ozonation. The reactive interemediates under study are N-centered radicals which are formed in ozone and hydroxyl radical reactions.In the early phases of the present project reactions of reactive intermediates with model compounds will be investigated. These model compounds resemble typical functional groups of the organic matter such as phenolic compounds. Later more complex systems will be investigated such as humic acids or organic matter isolates. The proposal will improve the understanding of ozone based transformation processes in real waters and help to better assess if harmfull transformation products may be formed.