WUZhihui,YANGLigang,LIUXiaowei,et al.Analysis of Temporal and Spatial Variation Characteristics and Key Influencing Factors of Source Sewage Quality in Urban Drainage Area[J].China Water & Wastewater,2026,42(5):124-130.
排水片区源头水质时空变化特性与影响因素分析
- Title:
- Analysis of Temporal and Spatial Variation Characteristics and Key Influencing Factors of Source Sewage Quality in Urban Drainage Area
- Keywords:
- drainage network; quality and efficiency enhancement; source sewage quality; influencing factor; temporal and spatial characteristics
- 摘要:
- 为探究污水管网源头水质的时空变化特征及其关键影响因素，以海南省某市主城区典型排水片区为研究对象，开展了大量现场水质采集与数据分析工作。结果表明，源头水质变化主要受到居民排水习惯、雨天入流入渗、化粪池降解等因素影响，其中，以住宅小区为主要排水户类型的排水片区源头污水COD浓度略高于以城中村为主要排水户类型的排水片区；排水高峰期间源头污水的COD和NH3-N浓度分别比平峰期间高30.69%和28.72%；源头排水户存在不同程度的雨污错混接现象，导致雨天排水户源头接驳井内污水COD和NH3-N浓度分别比晴天时低17.07%~79.35%和4.55%~57.89%；化粪池出水COD和NH3-N浓度相比进水的平均降幅分别为35.47%和17.81%。多元线性回归分析显示，晴雨天、排水时间段对源头污水的COD和NH3-N浓度均影响显著，化粪池的存在对COD浓度影响显著，但对NH3-N浓度影响不显著。因此，在进行源头污水要素排查时，需综合考虑时空变化特性与关键影响因素对源头水质的潜在影响，以确保提质增效战略的有效实施。
- Abstract:
- To investigate the temporal and spatial variation characteristics of source sewage quality in sewer network and identify its key influencing factors, a typical drainage area in the main urban area of a city in Hainan Province was selected as the study area. Extensive field sewage quality sampling and data analysis were conducted. The results indicated that source sewage quality variation was primarily influenced by factors such as residential drainage habits, inflow and infiltration during rainfall, and septic tank degradation. Specifically, the COD concentration in source sewage was slightly higher in drainage area dominated by residential communities compared to those dominated by urban villages. During peak drainage periods, the COD and NH3-N concentrations in source sewage were 30.69% and 28.72% higher, respectively, than during off-peak periods. Various degrees of misconnected or mixed rainwater and sewage were observed at source discharge points, leading to reductions in COD and NH3-N concentrations in the connection wells during wet weather by 17.07%-79.35% and 4.55%-57.89%, respectively, compared to dry weather. The average reductions in COD and NH3-N concentrations after septic tank treatment were 35.47% and 17.81%, respectively. Multiple linear regression analysis revealed that weather conditions (dry/wet) and drainage time periods significantly affected both COD and NH3-N concentrations, while the presence of septic tanks significantly influenced COD concentration but had no significant effect on NH3-N concentration. Therefore, in the investigation of source sewage characteristics, it is essential to comprehensively consider the potential impacts of temporal and spatial variation characteristics and key influencing factors on source sewage quality to ensure the effective implementation of the quality and efficiency enhancement strategy.
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