JIANGWen-chao,YANGXi,DONGXiao-xia,et al.Monitoring and Analysis of Hydraulic Parameters of Municipal Sewer in an Urban Area of Chongqing City[J].China Water & Wastewater,2022,38(15):78-83.
Monitoring and Analysis of Hydraulic Parameters of Municipal Sewer in an Urban Area of Chongqing City
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第15期
Page:
78-83
Column:
Date of publication:
2022-08-01
- Abstract:
- It is of great significance to understand the actual hydraulic condition of the municipal sewer system to improve its planning, design, maintenance and management. Therefore, the hydraulic parameters of the municipal sewers (DN400) in an urban area of Chongqing were monitored. The average flow velocities of W1-W4 monitoring sites were 0.16 m/s, 0.25 m/s, 0.52 m/s and 0.29 m/s, respectively, which did not reach the non?silting flow velocity of 0.60 m/s. The maximum flow velocities were 0.40 m/s, 0.51 m/s, 1.10 m/s and 0.55 m/s, respectively, which were all lower than the design flow velocity. The flow velocities with cumulative frequency of 95% were 0.29 m/s, 0.39 m/s, 0.92 m/s and 0.46 m/s, respectively, most of which were lower than the non-silting flow velocity. The corresponding fullness and flow rate monitoring data were also lower than the design value. The actual hydraulic condition of each monitoring site was far from the design condition, and the hydraulic efficiency was low, which might be related to the relatively too large values of municipal sewer minimum diameter and per capita water consumption standard. According to the average flow velocity of each monitoring site, the total retention time of sewage in a monitoring sewer with distance of 1 km was close to 1 h. Relatively too large pipe diameter may result in low hydraulic efficiency, waste of investment, increase of siltation, and even increase of sewage retention time and degradation rate of organic matter, which is worthy of attention.
Last Update:
2022-08-01