| In recent years,more and more attention has been paid to environmental air quality problems.Suspended particulate matter in the air seriously affects the quality of the air.The suspended particulate matter in the air mainly comes from the dust of urban construction sites and the dust of industrial yards.PM10 has a wide range of sources,unorganized emissions and difficult to control the characteristics,PM10 carrying a large number of toxic metal ions and infectious virus,affecting people's health,PM10 monitoring and prevention is particularly important.In this paper,the dust pollution of Tianjin construction site and stock yard is studied,the main conclusions are as follows:1.The construction site and the construction of four different scale stockyard carry out dust monitoring,the weight of the construction site and the stacking site analyzed dust particles concentration.The highest and lowest PM10 concentrations were 4460.5 ?g/m3 and 108.2 ?g/m3,which were 29.7 times and 0.7 times higher than the national standard?150 ?g/m3?.The inductively coupled plasma-mass spectrometry was used to quantitatively analyze 19 inorganic compounds and their compounds in the dust samples.The results showed that chromium,arsenic,cadmium and their compounds exceeded the environmental air pollutant concentrations2.The light scattering method is used to monitor the urban construction site and stockyard,and the monitoring data show that most of the regional air quality grades are good?AQI <100?and local pollution is slight.Emission factors for PM10 were corrected using the empirical formula.3.Virtual coordinates are established according to the scale of construction site and stock yard.Combining with regional scale,wind speed and PM10 emission intensity,FDM model is adopted to simulate.The simulation results show that PM10 emission factors are the order of emission intensity,wind speed and regional scale.The stronger the wind speed is,the smaller the PM10 emission rate is. |
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