纺织印染废水氯化脱色过程中高毒性转化产物的识别及生成机制研究

纺织印染废水氯化脱色与饮用水氯化消毒具有相似的化学反应过程，该过程具有较高的消毒副产物及其他高毒性转化产物的生成风险，然而目前对此过程中高毒性转化产物的识别和生成机制研究比较匮乏，由此带来的印染废水排放风险也缺乏足够的关注。本项目拟围绕印染废水氯化脱色过程中生成的高毒性转化产物开展研究，首先搭建印染废水中有机污染物的分级分离方法，以毒性测试为导向，通过高分辨质谱，建立疑似靶标和非靶标分析方法，精准识别印染废水氯化脱色过程中生成的消毒副产物及其他高毒性转化产物；利用超高分辨质谱筛查和密度泛函理论计算技术，解析印染废水中典型前体物模拟氯化脱色过程中的分子转化机制；最后通过风险熵值法评估印染废水尾水中高毒性转化产物的潜在生态风险。研究结果将为控制和降低印染废水排放风险提供理论依据和技术支持，为水环境中存在的与印染废水相关的高毒性有机污染物的源解析提供数据支撑。

Chlorination decolorization of textile dyeing wastewater and chlorination drinking water shows similar chemical reaction process, which has high generation risk of disinfection byproducts and other highly toxic transformation products. However, few studies reported about the identification and formation mechanism of the high toxicity transformation products in the chlorination decolorization of textile dyeing wastewater. Moreover, the resulting risk of dyeing wastewater discharge also lacks enough attention. This project aims to study of the highly toxic transformation products which are generated in chlorination decolorization of dyeing wastewater. Firstly, an effective fractionation extraction method of organic pollutants in dyeing wastewater will be developed, following of the toxicity test. Then analytical methods of suspected targets and of non-target analysis will be developed to identify the high toxic transformation products in chlorination decolorization of dyeing wastewater; The molecular transformation mechanism of typical precursors in the simulated chlorination decolorization of dyeing wastewater was analyzed by ultra-high resolution mass spectrometry screening and density functional theory calculation techniques. The potential ecological risks of highly toxic transformation products were evaluated by risk quotient. The results will provide theoretical basis and technical support for controlling and reducing the risk of dyeing wastewater discharge, and provide data support for the source resolution of highly toxic organic pollutants related to dyeing wastewater in environmental water.