Zhang Yiping, Chen Anchao, Zhang Ping, Zhou Yongchao, Zhang Tuqiao
The College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China E-mail:
Water Sci Technol. 2018 May;77(7-8):2077-2083. doi: 10.2166/wst.2018.121.
Suspended solids (SS) in the storm-water makes up a significant source of total suspended solids in wet weather flow. With appropriate modification and maintenance, the standard sumps in the drainage system can remove SS from storm-water runoff as a best management practice device. To increase the removal efficiency, especially in the condition of high flow rate, inclined plates, based on the shallow pool sedimentation theory, have been designed and refitted to the sump. Its performance under the different surface load and flow rate were evaluated through scale models. The results show that the preliminary design, Model A, had limited removal efficiency, and even played a negative role sometimes due to the concentrated flow in the axis. The optimizations through installing a non-uniform porous baffle (Model B) and adopting inverted V-shaped plates (Model C) were improved, and results show that removal efficiency rate can be increased by around 15-20%, even at high flow rates. Moreover, too many plates cannot improve the removal rate further, because they make the cross-section decline and lead to higher velocity between plates.
雨水径流中的悬浮固体（SS）是湿季径流中总悬浮固体的重要来源。经过适当改造和维护，排水系统中的标准集水池可作为一种最佳管理措施装置，去除雨水径流中的悬浮固体。为提高去除效率，特别是在高流量条件下，基于浅池沉淀理论设计并在集水池中加装了斜板。通过比例模型评估了其在不同表面负荷和流量下的性能。结果表明，初步设计的A型集水池去除效率有限，甚至有时由于轴心处水流集中而起到负面作用。通过安装非均匀多孔挡板（B型）和采用倒V形板（C型）进行优化后，去除效率得到提高，结果表明即使在高流量下，去除率也可提高约15% - 20%。此外，过多的板并不能进一步提高去除率，因为这会使横截面减小并导致板间流速升高。
