Street dust is an important fugitive emission source of particulate matter (PM), including total suspended particles (TSP), PM10, and PM2.5 . Street sweepers are normally used to remove street dust and garbage to keep the street clean, but they can contribute to secondary particle emissions due to a lack of effective particle control devices in the sweepers. This study aims to investigate the mass fraction of street dust to develop an effective filtration system to capture secondary particles. Silt (<94 <mu> m) in the collected street dust contains mainly PM10-94 with 94.14 % in the mass fraction. Based on the mass fraction data, a filtration system using composite filter media was designed, which consisted of 14 or 8 layers of flat or 3D-shaped fibrous demister filters with different porosities and fiber diameters for long-term operation and ease of regeneration using a water jet. The results showed that the 8-layer filter with an operating flow rate of 86 CMM (filtration velocity of 1.5 m/s) had desirable PM removal efficiency and long lifespan before regeneration. The initial pressure drop was only 43 Pa, while the initial removal efficiencies for TSP, PM10, and PM2.5 were 89.0 %, 79.6 %, and 46.0 %, respectively. The efficiencies were increased with increasing dust loading, and finally, they reached >96.7% after 62.9 h of operation with a corresponding pressure drop of 996 Pa. After regeneration, the system's initial pressure drop and collection efficiency were fully recovered, demonstrating the system's sustainability and operational reliability. The developed theoretical models for the pressure drop and removal efficiency were in good agreement with the field data. To conclude, the developed composite filter can be used as a viable and economical device to avoid secondary particle emission from street sweepers and the theoretical model can be used for the design in various dust removal applications.
