三维荧光光谱耦合平行因子分析法解析污染来源对排水系统溢流DOM的影响

Pollution sources have significant influences on the compositions of the dissolved organic matter (DOM) that exported from urban drainage system overflow. Mastery of these information is necessary for effective control of overflow pollution. In the pre-study of applicants, excitation−emission matrix parallel factor analysis (EEM-PARAFAC) was used to evaluate the influences of urban paved runoff and sanitary sewage on the compositions of the overflow DOM, and its effectiveness was proved. In this project, comprehensive evaluation and improvement of the key parameters and steps of this technology for overflow samples are firstly needed. The complex influence law of infiltration and non-osmotic surface runoff, domestic sewage, pipeline and forebay sediment etc. on the characteristic and composition of overflow DOM, are scheduled to be clarified. On this basis, the applicants will construct an theory system of visualized tracing of overflow pollution source with DOM fitted component index as the core, and form an illicit connection situation early warning technology for separated system rainwater pipe. The research results can provide reliable support for drainage system overflow control and system optimization management.

污染来源对排水系统溢流输出溶解性有机物（DOM）的组成具有重要影响，这方面信息的掌握对于实现溢流污染的有效控制很有必要。本项目申请者在前期预研究中，将三维荧光耦合平行因子分析法（EEM-PARAFAC）用于评估城市非渗透下垫面径流和生活污水两类来源对排水系统末端溢流DOM组成的影响，初步证明了该技术在这方面应用的有效性。本项目在此研究基础上，评估并健全该技术适用于城市排水系统内多种污染来源和末端溢流污水的关键参数与步骤，进而拓展解析城市渗透与非渗透下垫面径流、生活污水、管道与前池沉积物等几类主要污染来源对排水系统溢流DOM组成性质的影响规律。基于此，构建以DOM拟合组分指标为核心的城市排水系统溢流污染来源可视化追溯理论体系，并形成分流制系统雨水管混接状况的快速预警技术。研究成果能够为排水系统溢流控制及系统的优化管理和提标改造提供可靠的数据和决策支持。

项目研究针对多来源对城市排水系统溢流污染DOM的影响规律问题，基于EEM-PARAFAC法，对排水系统溢流污水携带的DOM进行了检测和模型拟合解析，评估并健全了该技术适用于城市排水系统多种污染来源和末端溢流污水分析的关键参数与步骤，配合其他检测手段，探究了多种污染来源对末端溢流DOM组成的影响规律。取得了基于DOM组分指示的城市雨天溢流主要污染来源的快速识别、EEM-PARAFAC法解析沉积物源对溢流污水DOM成分的影响、重金属离子与DOM在合流污水溢流中的络合特性、光学指标和分子组成揭示城市雨水径流DOM特性等方面的成果。在此基础上，构建了以DOM拟合组分指标为核心的城市排水系统溢流污染来源可视化追溯理论体系，并形成了分流制系统雨水管混接状况的快速预警技术。