ZhengWenhao,GaoZan,ZhangQionghua,et al.Occurrence Characteristics of Dissolved Organic Matter in Dry-Wet Deposition and Roof Runoff[J].China Water & Wastewater,2026,42(15):130-136.
干-湿沉降及屋面径流中溶解性有机物的赋存特性
- Title:
- Occurrence Characteristics of Dissolved Organic Matter in Dry-Wet Deposition and Roof Runoff
- Keywords:
- dissolved organic matter; roof runoff; wet deposition; emerging organic pollutants; occurrence characteristics
- 摘要:
- 通过监测10场降水事件（9场降雨、1场降雪），采用荧光光度计、紫外-可见分光光度计和总有机碳（TOC）分析仪等研究了干-湿沉降与西安市典型屋面雨水中的溶解性有机物（DOM）以及其中典型新污染物（EOPs）的赋存特征。结果表明，在屋面雨水集汇过程中，TOC为2.9~45.0 mg/L，降水时间序列上的TOC水平差异明显。此外，DOM主要由陆地类腐殖质、类色氨酸有机物组成，且集汇过程中发色有机物和荧光有机物显著增加，而降雪过程中DOM的光解效应有所减弱。通过溯源分析发现，其腐殖质主要由陆源和生物源共同作用产生，且以微生物代谢为主。EOPs检出34种，平均浓度达到432.3 ng/L，且典型EOPs检出率较高，如双酚A检出率可达100%。EOPs赋存特征具有显著的季节性差异，具体表现为夏季浓度最高且主要由湿沉降贡献。基于此，可通过改善屋面材质来优化传统径流污染控制措施，以实现DOM污染的有效控制。
- Abstract:
- By monitoring 10 precipitation events (9 rainfall events and 1 snowfall event), analytical methods including fluorophotometer, UV-visible spectrophotometer, and total organic carbon (TOC) analyzer were employed to investigate the occurrence characteristics of dissolved organic matter (DOM) and typical emerging organic pollutants (EOPs) in dry-wet deposition, as well as in rainwater collected from a typical roof in Xi’an. The results showed that during the roof rainwater collection process, TOC concentrations ranged from 2.9 mg/L to 45.0 mg/L, with significant variations in TOC levels across the precipitation time series. Moreover, DOM was mainly composed of terrestrial humic-like substances and tryptophan-like substances. A notable increase in chromophoric and fluorescent organic matter was observed during the collection process, while the photodegradation effect of DOM was weakened during the snowfall event. Source apportionment analysis revealed that the humic substances were primarily generated through the combined action of terrestrial and biological sources, with microbial metabolism being the dominant pathway. A total of 34 types of EOPs were detected, with an average concentration of 432.3 ng/L, and the detection rates of typical EOPs were relatively high—for instance, bisphenol A achieved a detection rate of 100%. The occurrence characteristics of EOPs exhibited significant seasonal differences, with the highest concentrations observed in summer, mainly contributed by wet deposition. Based on these findings, DOM pollution can be effectively controlled by improving roofing materials to optimize conventional runoff pollution control measures.
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