| In recent years,the construction and long-term operation of waste incineration plants will pollute the environment to a certain extent,and the resulting"neighborhood effect"has become more and more obvious.Especially the dioxin pollutants generated during the incineration process are highly toxic.Bioaccumulative characteristics such as refractory degradation can enter the human body through a variety of ways,causing harm to human health.The purpose of this study is to establish a list of dioxin air pollutant emissions from a waste incineration plant in the southwestern region from the bottom up,use the model to simulate the transportation,settlement and enrichment of soil dioxin pollutants emitted from the waste incineration plant,and analyze the waste incineration The distribution characteristics of dioxin in the soil around the plant and the risk of carcinogenicity of dioxin from typical urban waste incineration plants.Through this research,not only the model of dioxin air pollutant emission list of typical waste incineration plant can be established,so as to provide technical support for site selection,optimized layout,environmental impact assessment and disease prevention and control of waste incineration plant project,but also for the development of waste.Provide reference for the control of dioxin emission from incineration power generation and protection of ecological environment.The research results show that:（1）The total PCDD/Fs toxic equivalent concentration in the surface soil samples of the municipal solid waste incineration plant in Chengdu is0.257.5 ng I-TEQ/kg,and the concentration is 13964 ng/kg.Octachlorodibenzo-p-dioxin（OCDD）is the main contributing monomer,accounting for 25.17%85.03%of the total detection of PCDD/Fs in the soil at each sampling point.（2）The total PCDD/Fs toxic equivalent concentration in the surface soil samples around 3 garbage incineration plants in other areas is 0.310.8 ng I-TEQ/kg,and the concentration is 20.387.3 ng/kg.OCDD in soil is the main contributing monomer,accounting for 12.32%81.33%of the total detection of PCDD/Fs in soil at each sampling point.（3）The emissions of 14 household waste incineration plants in the southwest region range from 1.46×10-9 to 1.58×10-88 kg I-TEQ/h.The incineration plants with large average daily treatment capacity have a small emission factor.The emission factors of the three waste incineration plants are at the same level.（4）The monitoring values of wind speed and simulated values in Chengdu area are in good agreement,the monitoring values of temperature and simulated values are generally in good agreement,and the monitoring values of wind direction and simulated values are in good agreement;the monitoring values of wind speed in meteorological stations in other areas are in good agreement with simulated values The correlation coefficients are close to1.The meteorological fields simulated by CALMET in Chengdu and Southwest have certain representativeness and accuracy,can reflect the changes of meteorological fields in the region,and provide reliable meteorological data support for CALPUFF model simulation.（5）The contribution of 3 domestic waste incineration plants in Chengdu to the annual average concentration of ambient air ranges from 9.38×10-10 to 1.20×10-77 ng-TEQ/m3.The high value areas are mainly concentrated on the southwest side of a single plant,which is the weather conditions in the area are consistent.The average annual concentration contribution of dioxin in the atmosphere of typical domestic waste incineration plants in the southwest region is 1.88×10-101.56×10-7 ng-TEQ/m3,of which Chengdu,Meishan,Bazhong,Luzhou and the air pollution in Xichang is more obvious.（6）The annual average soil concentration contribution range in Chengdu is 4.00×10-46.18 ng-TEQ/m2.The high value areas of soil subsidence affecting Chengdu are mainly concentrated around each plant area.The distribution of high value areas and atmospheric dioxins the concentration distribution of British landing is similar,the maximum settlement per unit area is 6.18 ng-TEQ/m2.The annual average soil concentration contribution range of the MSW incineration plant in the southwest region is 1.07×10-47.06×10-22 ng-TEQ/m2,of which,Chengdu,Meishan,Bazhong,Luzhou and Xichang waste incineration plants The effect of soil enrichment is more obvious,and the simulated distribution of dioxin settlement matches well with the atmospheric diffusion trend.（7）The daily average respiratory exposure of adults to three dioxin in Chengdu area is 7.98×10-91.32×10-8 ng I-TEQ/kg·d,and the average daily respiratory exposure of children to dioxin It is 2.66×10-91.24×10-8 ng I-TEQ/kg·d;the daily average soil/dust exposure of adults to three dioxin in the 3 waste incineration plants in Chengdu ranges from 8.35×10-8 to 2.50×10-6 ng I-TEQ/kg·d,children The average daily soil/dust exposure to dioxin ranges from 3.43×10-7 to 1.03×10-55 ng I-TEQ/kg·d;the average daily skin contact exposure of adults to dioxin in 3 waste incineration plants in Chengdu is9.64×10-79.04×10-6 ng I-TEQ/kg·d,the average daily skin contact exposure of children to dioxins ranges from 0.86×10-6 to 5.58×10-5 ng I-TEQ/kg·d.（8）The three exposure routes of the three waste incineration plants and the R value of each exposure route are less than10-6,which is within the acceptable range;the non-carcinogenic risk of HR<1 for the respiratory exposure routes of the three waste incineration plants.The carcinogenic risk is negligible.There are non-carcinogenic risks in the soil/dust exposure route and skin contact route of Plant A,there is a non-carcinogenic risk in the skin contact exposure route of Plant B,and there is no non-carcinogenic risk in the three exposure routes of Plant C. |
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