Research on the pollution characteristics of surface runoff in Lingang New City

With more control of point source pollution,non-point source pollution attracted more and more attention.The pollutants variation over time and space,and the correlation among pollutants in surface runoff were analyzed on the basis of storm water monitoring.The results revealed that rainfall events with different characteristics had different laws of pollutants out of streams.Non-point source pollutants could be effectively reduced by the control of first runoff in the heavy rainfall event,while the whole rainfall runoff should be effectively controlled for there was almost no initial effect in the weak rainfall events.In the road runoff,the median concentrations of TN were 5.39,6.41 and 3.27 mg/L;CODMn,were 16.9,13.4 and 6.7 mg/L;NH3-N were 2.79,1.82 and 0.71 mg/L;TP were 0.27,0.24 and 0.07 mg/L,respectively in traffic area,commercial area,and cultural-educational area.In the roof runoff,the concentrations of TN,CODMn,NH3-N and TP were respectively 2.14,23.7,1.22 and 0.41 mg/L in green roof of commercial area,.The concentrations of TN,CODMn,NH3-N and TP were respectively 2.23,4.43,0.64 and 0.13 mg/L in tile roof of cultural-educational area.Runoff pollution of traffic and commercial areas was more serious than that of cultural-educational areas.Rainwater quality of the road runoff was worse than that of the roof runoff,and the dominant pollutants were TN and CODMn.The pollutants in the first runoff were in the form of adsorbing on the solid particles.