地表水含氮消毒副产物输入性前体的识别及控制

Surface water in downstream basin area is under severe complex pollution in our country. The imported dissolved organic nitrogen (DON) from sewage discharge and algae metabolism, which should be primarily controlled in drinking water treatment, are the main precursors of highly toxic nitrogenous disinfection byproducts (N-DBPs). First, a matrix DON fraction system composing membrane filtration and resin extraction will be established to isolate imported DON. Systematic instrumental analysis combined with N15 tracer approaches will be adopted to identify and character the DON fractions. Second, a comparative study about surface water and imported source (secondary effluent and lake water) will conducted to illustrate the path and the strength of imported DON, and then a relationship spectra between N-DBPs formation potentials and imported DON precursors from either river water and lake water. Finally, a simulated water-treatment system will be employed to comparatively evaluate the transformation pathway of DON precursors and intermediates in various treatment processes. Integration of research results, systematic identification of imported DON precursors will be accomplished as well as imported source, strength and characteristics, and a comprehensive understanding of N-DBPs formation potential in the complex polluted surface water will be provided. Furthermore, a series of depth treatment processes for controlling N-DBPs formation in complex polluted surface water could be proposed. The results will provide theoretical support for long-term drinking water safety technology development.

我国多数流域下游地表水属严重复杂污染水质，由污水排放和藻类代谢输入的溶解性有机氮化合物（DON）是高毒性含氮消毒副产物（N-DBPs）的主要前体物质，是饮用水深度处理工艺首要控制目标。本项目以珠三角地区饮用水源水体为研究平台，首先建立DON网格化分离方法定位前体物，利用系统仪器分析手段结合氮追踪方法，系统识别输入性DON前体成分及形态；其次通过地表水和输入源（二级污水和湖泊水）的水质对比研究，明确输入性DON前体的输入途径和强度，建立两大类地表水源水（河水、湖泊水）输入DON组分与N-DBPs生成势关联图谱；利用水处理模拟系统，对比前体物质的在各种处理工艺中的转化途径和中间产物。本项目可以系统识别输入性DON前体物来源、强度和形态，全面了解复杂污染地表水N-DBPs生成势情况，提出控制N-DBPs生成的深度处理工艺路线，为长期饮用水安全保障技术发展提供理论支持。

由污水排放和藻类代谢输入的溶解性有机氮化合物（DON）是高毒性含氮消毒副产物（N-DBPs）的主要前体物质，是饮用水深度处理工艺首要控制目标。本项目以珠三角地区饮用水源水体为研究平台，首先建立DON网格化分离方法定位前体物，利用系统仪器分析手段结合氮追踪方法，系统识别输入性DON前体成分及形态。通过地表水和输入源（二级污水和湖泊水）的水质对比研究，明确输入性DON前体的输入途径和强度，建立地表水源水输入DON组分与N-DBPs生成势关联图谱。本项目着重研究SMPs的环境归趋，包括光降解、吸附、生物降解过程，识别输入性DON前体物来源、强度和形态，分析SMPs在天然水体中的环境行为，全面了解复杂污染地表水N-DBPs生成势情况。项目在SMP光降解、吸附、生物降解三个方面都获得了系统的研究结果，为长期饮用水安全保障技术发展提供理论支持。