Study On Characteristics Of Storm Water Runoff Pollution In Typical Cities

Compared with ordinary roads,urban roads are a relatively confined place.Frequent traffic activities seriously pollute the runoff.High-density residential areas and commercial areas also cause roads to accumulate more pollutants due to the increase in urban population density.Due to the high content of SS,COD and N,P nutrients in pavement runoff,the characteristics of road runoff pollution were analyzed in order to achieve control and collection of road rainwater pollution.Based on this,this paper selects a trunk road,a high-density residential area and a commercial area road in Chongqing as the research object,analyzes the characteristics of the stormwater runoff pollution and the initial flushing effect of the pollution,and discusses the correlation of pollutants and the pollutants Based on the characteristics of the underlying surface and the seasons,the effects of the new porous fiber cotton technology,the combined biological floating island technology,and the landscape storage tank reuse technology on the control of stormwater runoff pollution were experimentally studied.Based on experimental and theoretical analysis,the following conclusions are obtained:(1)Through water quality monitoring,it shows that the stormwater runoff of a main road,the rainwater runoff in a high-density residential area,and the rainwater runoff in a commercial area are relatively serious,and is generally higher than the Surface Water Environmental Quality Standard(GB 3838-2002 Version).The V-type water index,far exceeding the reuse water standard,has a relatively high initial concentration of stormwater runoff pollutants SS,COD,TN,and TP,of which SS and COD are the most polluted and the initial concentration is the highest.COD.(2)The correlation analysis showed that pollutant SS had a significant correlation with COD,TP,and TN,and the correlation was SS~COD>SS~TP>SS~TN.The correlation of road pollutants in a high-density residential area was higher than that of a trunk.Contamination of road pollutants,analysis of the type of underlying surface,may be due to different sources of pollutants,resulting in a main road SS and TN concentrations significantly higher than a high-density residential roads,TP and COD concentrations significantly lower than a certain high Density of residential roads,analysis of the seasons,showed that in spring and autumn pollutants in Chongqing,SS,TN,COD was significantly higher than in summer.(3)Studying the control effects of different technologies.The results show that: a homemade porous fiber cotton device has higher removal efficiency for COD and SS than TN and TP,and can be better applied to municipal road facilities,but it has different degrees of congestion due to Attenuation of flow rate,the flow rate was attenuated by nearly 70% after 100 minutes of operation.The analysis of the best filtration speed showed that the best filtration rate for SS removal of pollutants was 2.6-3.3 mm/s,which was the best filter for the removal of TN and TP.The speed is 2.8-3.2mm/s.The combined biological floating island technology is applied to a rainwater pond.The average removal rates of turbidity,ammonia nitrogen,TN,TP,and COD reach 67.2% and 73.8%,respectively,under the five water exchange cycles.,14.8%,35.7%,35.14%,and the removal rate of pollutants may be related to the growth process of plants.With the growth of plants,the removal rate of turbidity,ammonia nitrogen,TN,and COD in the later period is significantly improved;The TN,TP,and COD pollutants have good control effects,and their reuse water quality meets the landscape water reuse regulations.