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.
In Situ Filtration Technology and Its SS Removal Performance at Drainage Outlet of Urban Drainage System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第5期
Page:
128-132
Column:
Date of publication:
2023-03-01
- Keywords:
- rainfall runoff; non-point pollution; rainwater outlet; in situ filtration; suspended solid (SS)
- 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.
Last Update:
2023-03-01