Research On Fugitive Dust Pollution Emission From Construction Project In Xi’an

With the acceleration of economic development and urbanization,particulate pollution has become a prominent problem affecting air quality,particle concentration has become an important indicator of atmospheric conditions.At present,Xi’an real estate and public facilities and other infrastructure construction are accelerating,construction dust pollution is also increasingly serious,construction dust has become a major source of pollution in Xi’an.Therefore,through the in-depth study on the construction dust pollution in Xi’an construction,so as to provide the basis for the government management departments to develop prevention measures and improve the regional air quality.First of all,combined with the operational unit emission factor method,the dissertation summarizes the main sources of figitive dust in construction,the construction process is divided into three dusting operation units: vehicle transportation dust,soil material loading and unloading dust,wind erosion dust.Based on emission factor empirical formula recommended by AP-42 of U.S.Environmental protection Agency,a calculation model of the dust emission factor applicable to the operating units of the local construction is established.Secondly,according to the analysis of the construction process,the paper divides the construction stage into four stages:earthwork excavation,foundation construction,earthwork backfilling and main body construction.By analyzing the characteristics of dust emission in each stage of the construction process,this paper puts forward the estimation method of dust emission in construction stage,and using a construction project in Xi’an to conduct experimental analysis.Finally,HYSPLIT model is used to analyze the migration path for air mass of construction dust,analyze the migration trajectory under different influencing factors,and study the change of each meteorological factor in the process of migration.The research method in this dissertation helps to quantitatively calculate the dust emission and analyze the migration path of air mass in different construction stages,and provide a method for estimating the pollution degree of construction dust and formulate effective and effective prevention and control measures.