Study On VOCs Emission Estimation And Diffusion In Surface Construction Process Of Municipal Road

In recent years,China and the world are facing serious environmental pollution problems.After large-scale emissions of greenhouse gases such as carbon dioxide has a tremendous impact on the global climate and the ecological environment,most of our cities are facing urban haze pollution caused by the increase of atmospheric particulate concentration.A wide range and long time of haze weather continues to occur,photochemical pollution often occurs,the deterioration of the urban environmental air quality significantly accelerated.Volatile organic compounds(VOCs)are complex and have more secondary products,which is an important precursors for the formation of photochemical smog.More and more species of VOCs in the atmosphere,and the atmospheric degradation components are very complicated.The impact on the environment and climate is becoming more and more important,and it has also become a key and difficult point in environmental monitoring and management.At present,the cause of urban road construction has made rapid development,so road pollution has become one of the important sources of urban air pollution.In this paper,the emission factor method is used to establish the estimation method of VOCs emission in the construction process of asphalt concrete road surface.The construction process of the surface layer is divided into four stages: Mixing of raw materials,transportation of the mixture,mixture paving and rolling.Through the analysis of the construction process of each stage to identify its VOCs emission sources and determine the appropriate level of activity and emission factors.On this basis,the estimation model of VOCs emission during road surface construction is established,and the emission of VOCs in the process of surface layer construction is compared.On this basis,the estimation model of VOCs emission during road surface construction is established,and the emission of VOCs in the process of surface layer construction is compared.The results show that: VOCs emissions from mechanical equipment at various stages of surface construction: transportation process> rolling process> paving process> mixing process.While transportation of transport machinery VOC emissions: stone transport> mixture transport> asphalt transport.Based on the estimation of VOCs emission in road surface construction,HYSPLIT model is used to simulate the forward diffusion of pollutants,and the pollutant diffusion path and range are simulated to understand the influence of VOCs pollutants from the construction section on other places.The simulation results show that the contaminant VOCs in the construction section of the surface during the simulation period can spread to the south of Ankang City,spread north to Yulin,spread westward to Qing yang and spread eastward to Weinan and other placesBased on the establishment and analysis of pollutant emission inventory of VOCs during the construction of road surface layer,and the simulation of VOCs diffusion in the construction section,the VOCs control strategy is put forward.