Characteristics and release of road runoff pollution under artificial rainfall intensity

The artificial rain was used to carry out the leaching test on the road of S306. The sampling of surface runoff under different rain intensity conditions was carried out. The COD, TSS, petroleum and Ammonia nitrogen (NH3-N) were compared in the range of 16.3mm/h~108mm/h. According to the data, the TSS of road runoff rainwater has a wide range of concentration (300-550mg/L). This is because the composition of pavement sediments determines the nature of road runoff pollution. The source of road runoff is complex and its pollutant composition is also complicated. However, the main pollution indicators causing runoff pollution are suspended solids (SS) and COD, and test data. The value shows that the lower value is mostly the monitoring value at the end of the rainfall. The reason is that the pollutants on the road surface have been taken away by the initial rainfall runoff in the late rain, so the concentration value is low.