Establishment Of Air Pollutant Emission Inventory In Concentrated Area Of Metallurgical Industry

Honghe Autonomous Prefecture is the modern industry culture origin of Yunnan Province and the important basement of non-ferrous metals and chemical industry in China.With the rapid development of economy,the pressure of regional air pollution control increases gradually.At present,as a whole the air quality of Honghe Autonomous Prefecture is good.But the air quality of some areas has become bad,especially that of Gejiu,Kaiyuan and Mengzi.As for regional air pollution comprehensive control,it usually needs to begin form regional entirety to establish comprehensive control measures and prevention measures.The emission concentration of pollutant,pollutant control target,pollution control effect evaluation and and air quality warning and forecasting need to identify the characteristic of regional air pollution emission source.Therefore,it is imminent to establish regional pollutant emission inventory and to do source apportionment of atmospheric particulates.The establishment of emission inventory takes 2016 as the base year and the investigation scope covers 14 villages and towns including Mengzi,Kaiyuan and Gejiu of Honghe Autonomous Prefecture.The inventory combines“bottom-up”and“top-down”methods and is based on the reality to categorize the regional air pollutant emission sources and to establish seven kinds of sources including fixed combustion source,technology process source,mobile source,dust,agriculture source and storage and transportation source.And the emission inventory contains many pollutants such as SO₂,NOx,CO,PM₁₀,PM_2.5,VOCs and NH₃.In addition,the inventory analyzes the time variance rule of industry source and mobile source and it combines geographical information system software?Arc-GIS?to get the spatial distribution of air emission source.The contents and research of the paper are as follows.?1?The total emission quantity of various air pollutants in Mengzi is 43499.8 ton SO₂,23910.4 ton NOx,33713.1 ton CO,7447.6 ton PM₁₀,4744.1 ton PM_2.5,8674.8ton VOCs and 3177.2 ton NH₃.?2?Among the air pollutant discharge of the three cities,Mengzi has the largest CO emission,Kaiyuan has the largest emission of NOx,VOCs and NH₃,and Gejiu the largest emission of particulate and SO₂.The emission of pollutants from fixed combustion sources is mainly concentrated in kaiyuan,and the other two cities are relatively less.As for the pollutants from technology process source,the emission of particles and SO₂ from Mengzi and Kaiyuan are far greater than that in Geijiu.The emission of VOCs from Kaiyuan is far higher than that in Mengzi and Geijiu.The pollutants from mobile sources in Mengzi are the largest.The main sources of dust sources are road dust and building dust.Mengzi has the largest emission of building dust,and Gejiu has the largest road dust emission.The main sources of ammonia are agricultural source and process source.?3?The highest annual emission of particulate matter in Mengzi is the technology process source,followed by the dust source and the fixed combustion source.And the highest annual emission in SO₂ is the technological process source;the highest annual emission in NOx is the fixed combustion source,and the technology process source is the largest source of VOCs and NH₃.?4?The spatial distribution of pollutants in Mengzi is unbalanced.The industries with larger CO emission are cement and thermal power are mainly in Mengzi and Kaiyuan,followed by slag processing and brick and tile manufacturing mainly in Datun town of Gejiu.The industries with larger VOCs emission are chemical,cement and non-ferrous metals,mainly distributed in Kaiyuan and Gejiu.And enterprises with larger SO₂ emission are mainly thermal power and non-ferrous metal smelting,mainly concentrated in Gejiu and Kaiyuan.In addition,enterprises with larger NOx emission are thermal power,chemical industry and non-ferrous smelting,mainly focused in Kaiyuan and Gejiu.Enterprises like thermal power,cement and non-ferrous metal,widely distributed,have larger emission of PM₁₀ and PM_2.5.?5?SO₂ and PM_2.5 which come from metallurgical industry accounted for 50%and 27.9%of the total pollutants in Mengzi area.Indicating that metallurgical industry has a greater impacting on SO₂ and PM_2.5,which is the primary source of SO₂ and PM_2.5.