关键词: 清扫方式, 道路扬尘, 积尘负荷, 尘土量, 清除效率, 颗粒物

Abstract: Road dust and fugitive dust are important sources of particulate matter in urban ambient air. In order to promote the construction of Chengdu park city, the relationship between different cleaning methods and road dust and fugitive dust was explored through simulation experiments. The results showed that when the dust load and dust volume were high, the single operation method of “dry sweeping” had the highest removal efficiency for both the dust load (86.78%) and dust volume (66.95%), but the sensory experience of the crowd was poor. The effect of “washing and sweeping” was inferior to “dry sweeping”, but the sensory experience of the crowd was better. Priority should be given to selecting the combination method of “dry sweeping+washing” and “washing sweeping+washing”. When the dust load and amount were low, a single operation method of “dry sweeping” or “washing sweeping” was sufficient. During the road cleaning operation, the mass concentrations of TSP, PM2.5 and PM10 in the roadside atmosphere increased by about 20%; After 5-10 minutes of cleaning, the concentration of particulate matter in the roadside atmosphere would not be affected. It was suggested that the road cleaning vehicles could be improved by adding partitions or dust collection covers and other devices to promote the “dry cleaning” with high cleaning efficiency. New materials or new technologies such as dust suppressor and ablation agent could be introduced to remove the old and compacted residual soil embedded in the road structure on both sides of the road, that could effectively improve the sensory comfort of the crowd and protect human health.

Key words: cleaning method, road dust, dust load, amount of dust, removal efficiency, particulate matter