College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an Shaanxi 710055, China.
College of Civil Engineering, Xi'an University of Architecture & Technology Huaqing College, Xi'an Shaanxi 710043, China.
J Environ Public Health. 2022 Sep 19;2022:1229636. doi: 10.1155/2022/1229636. eCollection 2022.
Aiming at the problem of pollutant migration and deposition in urban sewage confluence pipe, an experimental simulation system of sewage confluence pipe was established. The confluence conditions of three flow patterns (velocity ratio Vaccess/Vtrunk = 0.1/0.2, Vaccess/Vtrunk = 0.1/0.3, and Vaccess/Vtrunk = 0.2/0.3) were simulated. The changes of sediment thickness, carbon pollutants, nitrogen pollutants, and phosphorus pollutants in different confluence areas were analyzed, and the migration and deposition laws of various pollutants in urban sewage confluence pipe network under different flow patterns were revealed. The results show that when the flow velocity of trunk and branch roads changes, the deposition of various pollutants and the carrying capacity of water flow in the pipeline change, resulting in the change of sediment layer thickness and pollutant content. With the increase of trunk velocity, the sediment thickness in the area before and after confluence decreases, while the increase of branch velocity only reduces the sediment thickness in the area at the back of confluence. Under any flow pattern, the sediment thickness in the retention area (G3 and G4) shows an increasing trend, which is the key area of pollution removal. Under the three flow patterns, the content of carbon pollutants reaches the peak at the TCOD and SCOD values of G4 monitoring point. Increasing the trunk velocity can effectively reduce the content of carbon pollutants. The content of nitrogen pollutants in each flow pattern also reaches the maximum at G4 point, which are 213.6 mg/g, 205.2 mg/g, and 212.8 mg/g, respectively. Increasing the trunk velocity can effectively reduce the nitrogen content at points G1-G4, while increasing the flow velocity of the branch road can reduce the nitrogen content at points G5-G7. The distribution of phosphorus pollutants is complex, and the flow pattern needs to be adjusted according to different monitoring points.
针对城市污水汇流管中污染物迁移和沉积的问题，建立了污水汇流管实验模拟系统。模拟了三种流态（Vaccess/Vtrunk = 0.1/0.2、Vaccess/Vtrunk = 0.1/0.3 和 Vaccess/Vtrunk = 0.2/0.3）的汇流条件。分析了不同汇流区域泥沙厚度、碳污染物、氮污染物和磷污染物的变化，揭示了不同流态下城市污水汇流管网中各种污染物的迁移和沉积规律。结果表明，当干、支管路流速发生变化时，各种污染物的沉积和水流的携带能力发生变化，导致泥沙层厚度和污染物含量发生变化。随着干线速度的增加，汇流前后区域的泥沙厚度减小，而支线速度的增加仅减小了汇流后区域的泥沙厚度。在任何流态下，滞留区（G3 和 G4）的泥沙厚度呈增加趋势，是去除污染的关键区域。在三种流态下，各监测点的 TCOD 和 SCOD 值均达到碳污染物含量峰值，即 G4 监测点。增加干线速度可以有效降低碳污染物含量。各流态下的氮污染物含量也在 G4 点达到最大值，分别为 213.6mg/g、205.2mg/g 和 212.8mg/g。增加干线速度可以有效降低 G1-G4 点的氮含量，而增加支路速度可以降低 G5-G7 点的氮含量。磷污染物的分布较为复杂，需要根据不同的监测点调整流态。
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