Establishment Of Atmospheric Pollution Source Spectrum And Pollution Risk Assessment In Nonferrous Industrial Parks

In order to effectively prevent and control air pollution,it is necessary to explore and analyze its root causes,and it is necessary to clearly discover the source of its pollution and its pollution emission characteristics and the health risks to the human body.Therefore,this study initially explored the non-ferrous industry concentration area and the fixed source of Mengzi area?except for a large number of non-ferrous smelting and other fixed sources such as chemical,cement,steel,thermal power?and open source?soil dust,road dust,urban dust?The characteristics of particulate matter discharged,established fixed source and open source spectrum,and carried out environmental assessment and health risk assessment for open source,and provided scientific data foundation for the analysis of source of atmospheric pollutants and the formulation of emission inventory in the non-ferrous smelting industry..The research shows that the mass concentration ranges of PM_2.5 and PM₁₀ for various fixed source flue gases are 21.79¹01.899mg/m³ and 48.31¹32.899mg/m³,respectively.The highest concentration is steel,followed by chemical,non-ferrous smelting,thermal power,cement.Compared with other fixed sources,the following chemical components exhibit higher concentrations.For example,heavy metals such as Pb,Cr,As,and Cd are higher than other fixed sources,and crust elements,SO₄²-,NO₃^-,OC,and EC also show Higher concentration levels.In the non-ferrous smelting and cement industry,the particulate matter is alkaline,the colored smelting tends to be neutral,and the cement industry is strongly alkaline.The ratio of OC/EC in the thermal power industry is the highest in both fine and coarse particles.Among the 16 polycyclic aromatic hydrocarbons,polycyclic aromatic hydrocarbons such as ANT,FL,BaA,BbF,BkF,BaP,IND,DBA and BghiP exhibited higher concentration levels.The concentrations of medium-low ring,middle ring and high-ring polycyclic aromatic hydrocarbons in PM_2.5 ranged from 7.95 to21.332?g/m³,5.99 to 16.272?g/m³,and 14.33 to 39.622?g/m³,respectively.They were10.99⁴5.902?g/m³,8.31³5.832?g/m³,and 20.06⁸6.92?g/m³.Among the three types of open source research,the proportion of crust elements in soil dust,road dust,and urban dust fine coarse particles is 15.83²4.89%,17.89³1.94%,15.4¹7.79%;water-soluble ions are dusting in soil.The ratio of road dust and urban dust fine and coarse particles is 22.55²4.28%,23.86²1.20%,15.14²3.53%;the proportion of trace elements in soil dust,road dust and urban dust fine coarse particles is 6.49.³.74%,3.60².52%,13.83⁵.62%.The proportion of carbon in soil dust,road dust and urban dust fine and coarse particles is 3.65¹.58%,5.92¹.48%,3.87⁷.33%.The results of soil dust,road dust and urban dust in the crustal material reconstruction of PM_2.5 were 24.42%,27.41%,23.19%.The results of crustal material reconstitution in PM₁₀ were 41.35%,50.41%,and 28.97%.In the three open sources,Pb elements are more than extremely strongly enriched,and Zn,As and Cd mostly exhibit significant enrichment.As a marker element for non-ferrous smelting,Pb and As are highly enriched and may be affected by concentrated smelting.In the study of health risks,the risk values were ranked by hand feeding>skin contact>respiratory inhalation.Overall,these eight heavy metals pose a non-carcinogenic risk to children greater than adults.In soil dust,the risk of Pb intake and skin contact in the hand is higher than 1,Cd is the risk value of the children in the PM_2.5 is higher than the valve;in the road dust,Pb and Cd are two heavy metals in children The non-carcinogenic risk value of the age group was higher than 1,and the non-carcinogenic risk value of Pb in the adult population of PM_2.5 was higher than the threshold;the risk value of Pb element in all three exposure pathways was higher than 1,and Cd was in PM₁₀.In the middle adult group,the risk value is lower than the threshold,and in other cases,the risk value is higher than the threshold.The risk of cancer caused by As and Cr in heavy metals is high.These two heavy metals pose a carcinogenic risk to the human body.Next,Cd will cause cancer risk in people's fine particles.