Effect of antecedent dry period on the pollution characteristics of runoff from roofs of different materials
Typical roof materials(asphalt felt,plastic steel and tile)in cities were taken as research object,the pollution characteristics of runoff from roofs of different materials under different antecedent dry period were investigated through artificial simulated rainfall.Results showed that the event mean concentration(EMC)of SS,COD,TP and TN in a descending order was asphalt felt roof,tile roof and plastic steel roof,while the effect of roof materials on the EMC of heavy metals was different.In general,the concentrations of pollutants increased with antecedent dry period.In particular,the volume fraction of small particles increased with the increase of the antecedent dry period,while that of big ones decreased.SS in roof runoff were major carriers of COD,TP and heavy metals,pollutants were especially correlated with small particles.Therefore,in order to control COD,TP and heavy metals in roof runoff,it was suggested to control small particles.
runoff pollutionantecedent dry periodroofparticleheavy metal
万方数据
维普
