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.
Migration and Distribution of Sediment in Sewage Sewer Network under Different Confluence Conditions
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
107-113
Column:
Date of publication:
2023-04-01
- 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.
Last Update:
2023-04-01