Study On Pollution Effect Of Farm Straw Burning In The Surrounding Area Of Changchun To Atmospheric Fine Particulate Matter In Central Area Of The City

Changchun City is located in the core area of "Northeast China Corn Belt",65%of the land area for crop sowing,with an annual output of about 11 million tons of straw.The status of comprehensive utilization rate is 35% and a large amounts of abandoned straw in the field are directly burned without processing.However burning time is always relatively concentrated in the spring before the spring planting and the winter after autumn harvest.And the pollution of fine particulate matter in the central urban area of Changchun has a certain relationship with the straw burning around the central urban area.In this paper,the Statistical Analysis Method was adopted to screen the data of the monitoring of fine particles in Changchun City and the data related to the source analysis of fine particulate matter.The fine particulate matter pollution in the central urban area of ??Changchun was obtained by the influence of open burning of straw evidence.In this paper,the AERMOD model was used to simulate the diffusion of fine particulate matter contaminated by open burning in the surrounding farmland of Changchun City.The basic situation of fine particulate matter diffusion and the influence on the central urban area during the straw incineration were analyzed.The results showed that the effects of straw burning on the fine particulate matter pollution in the central urban area of ??Changchun were not to be neglected.The influencing factors were mainly source intensity,emission time,farmland position and effective source.According to the results of analysis,this paper puts forward the countermeasures to reduce the pollutant discharge from the source in the process of straw burning in Changchun City from the perspective of the main influencing factors in the process of contaminant diffusion in this paper.The effect of priority treatment on the utilization of straw Regional,reasonable control of the combustion process and other rationalization proposals,in order to further reduce the impact of straw burning pollution laid the theoretical basis.