【摘要】 雨污混错接是中国城市排水管网系统普遍存在的问题，其塑造的水质条件可能对管网内的碳排放格局形成深远影响。迄今为止，相关问题尚未得到清晰阐释。该研究以上海市中心城区某分流制雨水系统作为研究对象，共设置41个管道检查井监测点。通过为期1 a的采样监测工作，分析了COD、TN、NH₃-N、溶解性有机物（DOM）荧光成分等水质、泥质指标，以及气相空间的CO₂、CH₄浓度，并利用主成分分析和K-means聚类分析方法探究了潜在混错接塑造的现场水质条件对CH₄和CO₂排放的复合性影响。结果表明：（1）研究管网存在明显的CO₂和CH₄排放量，且受淤积条件影响，无淤积管道的CO₂浓度为（11.04±4.41） mg/L,CH₄浓度为（2.81±0.99） mg/L，泥水分层管道的CO₂浓度为（13.49±5.74） mg/L,CH₄浓度为（3.16±0.94） mg/L;（2）荧光分析结果显示，雨水管道污水DOM成分总体包含43%的酪氨酸类组分C1、47%的色氨酸类组分C2和10%的陆源腐殖质类组分C4，其指纹特征与生活污水源相似，表明研究管道区域内存在普遍的生活污水混错接情况；（3）PCA结果显示，DOM成分是CO₂和CH₄产量的重要影响因素，COD浓度则主要影响CH₄产量。更多还原

【Abstract】 Illicit connection is a common problem in China’s urban drainage network system, and the water quality conditions it shapes may have far-reaching impacts on the carbon emission patterns within the network. To date, the related problems have not been clearly explained. In this study, 41 monitoring wells were investigated in a storm sewer system in central Shanghai. Through a one-year sampling and monitoring, water and sediment quality indicators, including COD, TN, NH₃-N,and dissolved organic matter（DOM） fluorescent components and CO₂ and CH₄ concentrations in the gas-phase space, were analyzed. The compounding effects of field water quality conditions, shaped by potentially illicit connections on CH₄ and CO₂ emissions, were assessed using principal component analysis and K-means clustering analysis methods. The results showed that significant CO₂ and CH₄ emissions were found in the study sewer network, which was affected by the siltation conditions:CO₂ concentration of the sewer with no sediment was（11.04±4.41） mg/L, and CH₄ concentration was（2.81±0.99） mg/L;CO₂ concentration of the sediment-water layered sewer was（13.49±5.74） mg/L, and CH₄ concentration was（3.16±0.94） mg/L.Fluorescence analysis revealed that the overall DOM composition of the storm sewer wastewater contained 43% of tyrosinelike component C1, 47% of tryptophan-like component C2, and 10% of terrestrial humic-like component C4. This fluorescence fingerprint was similar to those of domestic wastewater sources, suggesting that there was a widespread domestic wastewater misconnection in the study catchment. PCA results showed that the DOM components were the critical factor in the CO₂ and CH₄ production, while COD concentration mainly affected CH₄ production.更多还原