WANGZhefeng,ZHUZheng,XUChongxuan,et al.Distribution Patterns and Sources Analysis of Dissolved Organic Matter in Water Bodies Recharged with Reclaimed Water[J].China Water & Wastewater,2026,42(3):70-77.
Distribution Patterns and Sources Analysis of Dissolved Organic Matter in Water Bodies Recharged with Reclaimed Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第3期
Page:
70-77
Column:
Date of publication:
2026-02-01
- Keywords:
- reclaimed water source; urban water body; dissolved organic matter (DOM); fluorescence spectroscopy; aquatic phytoremediation
- Abstract:
- Reclaimed water is a crucial supplementary source for urban water bodies. The dissolved organic matter (DOM) it contains is primarily composed of refractory organic compounds, which can lead to pollution of the receiving water bodies, especially during summer. This study investigated the Yuanmingyuan landscape water body, which is entirely replenished by reclaimed water. Chemical analysis and spectroscopic methods were employed to examine characteristic indices, aiming to understand the spatial distribution patterns and primary sources of organic matter during reclaimed water reuse in summer. The results showed that the COD concentration within the study area followed a distribution pattern of lower values in the west and higher values in the east, with enrichment and accumulation occurring in both broad and relatively enclosed water areas. The aquatic phytoremediation zones demonstrated a clear degradative effect on COD, with an average degradation rate of 27.28%. The main organic components in the water body included tryptophan-like, humic-like, and tyrosine-like substances. The primary source of DOM was biological, associated with microbial metabolites from the reclaimed water reuse process as well as the metabolic activities of plants and microorganisms within the water body. Correlation analysis revealed a strong positive correlation between COD and tyrosine-like substances, indicating that the organic matter exceedance was caused by the accumulation of refractory organic compounds. Additionally, COD showed a negative correlation with aquatic plant coverage density, suggesting that aquatic plants and their associated microorganisms played a positive role in COD degradation.
Last Update:
2026-02-01