ZHANGWei-jia,SUNYong-li,GAOChen-chen,et al.Sedimentation and Scouring Characteristics of Pollutants in Sewage Pipe Network and Their Efficiency Responses under Varying Flow Velocities[J].China Water & Wastewater,2025,41(21):46-51.
流速驱动下管网污染物沉积-冲刷特征及效能响应
- Title:
- Sedimentation and Scouring Characteristics of Pollutants in Sewage Pipe Network and Their Efficiency Responses under Varying Flow Velocities
- Keywords:
- sewage pipe network; pollutants sedimentation; scouring response; flow velocity regulation; sedimentation prevention and control
- 摘要:
- 针对污水管网污染物低流速沉积的防控技术难题，构建污水管道沉积-冲刷模拟中试装置，深入研究污水管网流速变化与污染物沉积-冲刷的响应规律。结果表明，高流速冲刷可显著提升污染物收集效率，当流速调控至0.8 m/s以上时，沉积物的冲刷效应显著增强，冲刷强度对污水流速高度敏感；流速变化直接影响污染物沉积和再悬浮的迁移过程，在复合流速运行模式下，污染物浓度整体呈现“沉积衰减-冲刷提升-沉积衰减”的变化规律。因此，当实际污水管道长时间处于0.3 m/s以下的低流速运行时，采取阶段性高流速冲刷措施，可有效减少有机物沉积、提升污染物收集效率。
- Abstract:
- This study conducted an in-depth investigation into the response characteristics of pollutants sedimentation and scouring under varying flow velocities in sewage pipe network using a specially designed sewage pipe sedimentation-scouring simulation pilot device, to address the technical challenges associated with preventing and controlling the sedimentation of pollutants under low-flow conditions in sewage pipe network. High-flow scouring significantly improved the collection efficiency of pollutants. When the flow velocity exceeded 0.8 m/s, the sediment scouring effect was markedly enhanced, and scouring intensity exhibited high sensitivity to sewage flow velocity. Variations in flow velocity directly influenced the processes of pollutants sedimentation and resuspension. Under multiple flow velocity operating conditions, the overall pollutants concentration followed a distinct pattern characterized by “sedimentation attenuation-scouring lift-sedimentation attenuation”. Therefore, implementing phased high-flow scouring measures can effectively mitigate organic matters sedimentation and enhance pollutants collection efficiency when the actual sewage pipe operates at a low flow velocity of less than 0.3 m/s over an extended period.
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