XUETian,SHIXuan,ZHAONan,et al.Migration and Distribution of Sediment in Sewage Sewer Network under Different Confluence Conditions[J].China Water & Wastewater,2023,39(7):107-113.
污水管网不同汇流条件下沉积物运移分布规律
- Title:
- Migration and Distribution of Sediment in Sewage Sewer Network under Different Confluence Conditions
- 摘要:
- 为探明城市污水管网不同汇流条件下沉积物运移分布规律，通过建立污水管网中试系统，探究了不同汇流区域沉积物厚度的变化特征和碳、氮、磷污染物的冲刷沉积特性。根据研究结果可将污水管网沿程划分为滞流区、分离区、最大流速区、流动复原区四个功能区域。其中，当污水管网干流增加时，管道整体沉积层厚度显著下降，最大流速区冲刷特性最为显著，但滞留区和分离区的污染物浓度均有所增加，且各区域表层碳类沉积污染物占比明显增加，氮、磷类沉积污染物的占比变化不显著；相对于干流增加，支流增加时滞留区和分离区污染物浓度仍有增加，但其引起的沉积物厚度下降量较低，最大流速区和流动复原区污染物浓度下降较少。
- Abstract:
- To explore the migration and distribution of sediment in urban sewage sewer network under different confluence conditions, a pilot sewage sewer network system was established to explore the variation of sediment thickness and the scour and deposition of carbon, nitrogen and phosphorus pollutants in different confluence areas. According to the research results, the sewage sewer network could be divided into four functional areas along the route: detention zone, separation zone, maximum flow velocity zone and flow recovery zone. When the main flow of the sewage sewer network increased, the overall sediment thickness of the sewer decreased significantly, and the scour in the maximum flow velocity zone was the most significant. However, the concentration of pollutants in both the detention zone and the separation zone increased, and the proportion of carbon sediment pollutants in the surface layer of each area increased significantly, while the proportion of nitrogen and phosphorus sediment pollutants did not change significantly. Compared with the increase of the main flow, the concentration of pollutants in the detention zone and separation zone still increased with the increase of branch flow. However, the decrease of sediment thickness caused by the increase was lower, and the decrease of pollutant concentration in the maximum flow velocity zone and flow recovery zone was less.
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