PAHs content in the runoff of two different types of roofs in Nanjing were monitored through the field sampling during 9 rainfall events. The EMCs (event mean concentration) and PAHs (polycyclic aromatic hydrocarbons) composition were analyzed and compared, and then the first flush effect and the influential factors were discussed. The results show that the PAHs pollution in asphalt roof runoff is more serious. The average EMC value of PAHs in asphalt roof and tile roof runoff are 4 261.7, 351.2 ng/L, respectively. The main component of PAHs in both roof runoffs is 4-ring PAHs, 3-ring PAHs in asphalt roof runoff also account for a large proportion, while 5-ring and 6-ring PAHs in tile roof runoff are only slightly less than 4-ring PAHs. Total PAHs and relevant components exhibit a pronounced first flush effect in most rainfall events; Correlation analysis suggests that the antecedent dry period is the most significant influential factor for PAHs accumulation on the roof, and the PAHs content in tile roof runoff is mainly influenced by rainfall intensity, while the PAHs content in asphalt roof runoff is mainly influenced by rainfall quantity.
|Number of pages||5|
|Journal||Dongnan Daxue Xuebao (Ziran Kexue Ban)|
|Publication status||Published - Jan 2012|
- Event mean concentration (EMC)
- First flush
- Influential factors
- Roof runoff