Research Of The Low Impact Development Using In The Campus

China's major cities are now in the high-speed economic development,natural environment is relatively bad phase,as the urban population,lack of urban water resources is also slightly,the campus as an integral system,city the stand or fall of the ecological environment can provide an important reference for the urban environment.In the ground water resources can not guarantee urban water,rain water resources as a kind of unconventional water resources into our line of sight,both international and domestic city now will focus on how to adjust measures to local conditions according to the local actual situation the planning and development of rainwater collection and utilization.Based on the understanding of rainwater technology development situation in abroad,the current college campus water quality sampling analysis of the specific,finally combined with low impact development technology for comprehensive utilization of rainwater in the campus.The article select southern district of Anhui Jianzhu University as a study area,the different types of underlying surface on campus to carry out the rain runoff water quality characteristics of the study.Campus,in general,roof and the rain runoff water quality is good,the greenery of roof rainwater runoff can be treated with simple physics into the artificial lake or discharged into rainwater pipe network,green space for stormwater runoff pollutants reduction effect is remarkable,after green of the rain,in addition to the TN concentration is higher,other pollutants indexes accord with the requirement of ?water,can be directly discharged into lake,which is low impact measures direct application in the campus.Road rain water have the worst quality,the main reason is influenced by many man-made factors,so for the road rain,we can be in two aspects: At first,the path into the rain,rain pipes behind for settlement and pollutant reduction measures such as;then second,it is beside the road recessed green measures,set up under the LID making road rain through the recessed green cutting,finally into the artificial lake,which is low impact development very direct application in the campus.According to the different underlying surface rain water pollutant concentration change with rainfall time curve,it can be seen that the early rain,noting that the generally high pollutant concentration under the rain rain,different types of underlying surface water pollutant concentrations in general the more significant the flow within 20 min ~ 40 min,this suggests that reasonable abandon of initial rainwater runoff flow can relieve the follow-up of the rainwater treatment facilities are working load.According to the rain water quality data analysis,from different angles can be roughly reflect the similar rule: pollutants in stormwater runoff concentration are positively correlation with the rainfall time interval,the rainfall,the longer the time interval of rainfall runoff pollutants in the initial concentration is higher.Based on the data collecting rainwater runoff pollutants,Hefei area atmospheric wet deposition has influence on all kinds of underlying surface TN content,characteristics of soil phosphorus in Hefei area high on roads,green space of runoff water quality had a greater influence on the content of TP.According to the rainwater runoff pollutants SS and COD,TN,TP,correlation analysis,can be found between SS and COD,TN and TP are at a higher level,so the removal of SS in the rain to purify rain water quality has great value as a whole.