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、NH_(3)-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CO_(2)、CH_(4)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CH_(4)和CO_(2)排放的复合性影响。结果表明:(1)研究管网存在明显的CO_(2)和CH_(4)排放量,且受淤积条件影响,无淤积管道的CO_(2)浓度为(11.04±4.41) mg/L,CH_(4)浓度为(2.81±0.99) mg/L,泥水分层管道的CO_(2)浓度为(13.49±5.74) mg/L,CH_(4)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CO_(2)和CH_(4)产量的重要影响因素,COD浓度则主要影响CH_(4)产量。
Illicit connection is a common problem in China’s urban drainage network system,and the water quality condi⁃tions it shapes may have far-reaching impacts on the carbon emission patterns within the network.To date,the related prob⁃lems 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,NH_(3)-N,and dissolved organic matter(DOM)fluorescent components and CO_(2) and CH_(4) concentrations in the gas-phase space,were analyzed.The compounding effects of field water quality conditions,shaped by potentially illicit connections on CH_(4) and CO_(2) emissions,were assessed using principal component analysis and K-means clustering analysis methods.The results showed that significant CO_(2) and CH_(4) emissions were found in the study sewer network,which was affected by the siltation conditions:CO_(2) concentration of the sewer with no sediment was(11.04±4.41)mg/L,and CH_(4) concentration was(2.81±0.99)mg/L;CO_(2) concentration of the sediment-water layered sewer was(13.49±5.74)mg/L,and CH_(4) 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 waste⁃water misconnection in the study catchment.PCA results showed that the DOM components were the critical factor in the CO_(2) and CH_(4) production,while COD concentration mainly affected CH_(4) production.
作者
陈浩
易永娇
叶建锋
李玉
张婷
方宁
郭亚丽
CHEN Hao;YI Yongjiao;YE Jianfeng;LI Yu;ZHANG Ting;FANG Ning;GUO Yali(Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200335,China;School of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Tongji University,Shanghai 200092,China)
出处
《环境科学与技术》
北大核心
2025年第12期227-236,共10页
Environmental Science & Technology
基金
上海勘测设计研究院有限公司科技开发项目(2023SZ(83)-002)
上海市科委自然科学基金(24ZR1450500)。
关键词
市政雨水管网
碳排放
混错接
水质
storm sewer network
carbon emissions
illicit connection
water quality
