ZHONGJiang-li,ZHANGPing,SHENJie,et al.In Situ Filtration Technology and Its SS Removal Performance at Drainage Outlet of Urban Drainage System[J].China Water & Wastewater,2023,39(5):128-132.
城市排水系统排放口原位过滤技术及SS去除效果
- Title:
- In Situ Filtration Technology and Its SS Removal Performance at Drainage Outlet of Urban Drainage System
- Keywords:
- rainfall runoff; non-point pollution; rainwater outlet; in situ filtration; suspended solid (SS)
- 摘要:
- 城市雨水径流面源污染经排放口直接排放逐渐成为水体污染的主要原因。针对雨水排放口点多面散的特点，提出了一种基于轻质填料的原位过滤技术，该技术可通过定期维护实现滤料清洗，从而实现长期运行。以悬浮固体（SS）作为评价指标对该技术进行了模拟评估，并在此基础上进一步开展了实际应用研究，考察该技术对SS的实际控制效果。结果表明，该技术对SS总体上具有很好的净化效果，在滤层厚度为10 cm、滤速为106.7 m/h的条件下，SS去除率可达到70%~80%。SS去除效果受滤料粒径、滤层厚度以及滤速（排放流量）的影响，较厚的滤层具有较好的SS去除效果，但滤层厚度超过10 cm后，SS去除率增幅较小；粒径较小的滤料具有更高的SS去除能力。但是，较厚的滤层和较小的滤料会造成水头损失的增加，对排放安全产生一定影响。因此，工程应用中应在综合考虑排放安全的前提下，合理选取滤层厚度与滤料粒径。
- Abstract:
- The pollution of urban rainfall runoff from non-point source directly discharging through the outlet is gradually becoming the main cause of water pollution. Aiming at the characteristics of high density rainwater outlet dispersed in urban areas, an in situ filtration technology based on lightweight media was proposed. The technology realized filter cleaning through regular maintenance, and long-term operation of the filter was achieved. The technology was simulated and evaluated by using suspended solids (SS) as the evaluation index. On this basis, the practical application of the technology was further carried out to investigate its actual performance for SS control. The technology had a good SS removal performance on the whole. When the depth of the media was 10 cm and the filtration velocity was 106.7 m/h, the SS removal rate reached 70%-80%. The SS removal performance was affected by the media particle size, the depth of the filter bed and the filtration velocity (discharge flow). The larger filter layer depth resulted in a better SS removal performance. However, the SS removal rate increased slightly when the depth of the filter layer was more than 10 cm. The media with smaller particle size had better SS removal capacity. However, the thicker filter bed and smaller particle size media resulted in the increase of head loss, which had a certain impact on discharge safety. Therefore, filter bed thickness and media particle size should be selected reasonably on the premise of comprehensive consideration of discharge safety in engineering application.
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