Research on pollution characteristics and initial effect of surface runoff in Lingang new city of Shanghai

With the stricter control of point source pollution,non-point source pollution caused by rainfall runoff is paid more and more attention.The pollution load and the first flush effect of urban runoff were analyzed on the basis of stormwater runoff analysis.The results reveal that the concentration fluctuation of TN,TP and CODMn for the urban runoff are 0.03~52.27,0.01~18.85 and 0.27~111.26 mg/L respectively.In road runoff,the pollution of different functional areas followed the sequence of traffic areacommercial areacultural and educational area.In roof runoff,the pollution of commercial area is more serious than that of cultural and educational area.The yearly road runoff pollution load in cultural and education area is the lowest,and the loads of TN,TP and CODMn are 11.16,1.03and 33.33 kg/(hm2·a-1) respectively.The yearly roof runoff pollution load of commercial area is the highest,and the loads of TN,TP and CODMn are 31.49,5.61 and 172.87 kg/(hm2·a-1) respectively.First flush effect of the road runoff is evident,while that of the roof runoff is weak in most rainfall events based on the result of the analysis of M(V)curve and parameter b.