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.
Occurrence Characteristics of Dissolved Organic Matter in Dry-Wet Deposition and Roof Runoff
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第15期
Page:
130-136
Column:
Date of publication:
2026-08-01
- Keywords:
- dissolved organic matter; roof runoff; wet deposition; emerging organic pollutants; occurrence characteristics
- 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.
Last Update:
2026-08-01