AERMOD模型模拟城市生活垃圾焚烧厂二 英类物质扩散迁移

根据二 英类物质在常温大气环境中的固相吸附态比例约为90%~100%的特性,提出以颗粒物TSP和PM10为载体模拟二 英类物质扩散迁移过程,并采用AERMOD模型进行模拟.结果表明,100%和80%的气-固分配系数设置对二 英类物质扩散迁移落地点浓度和距离影响不显著,颗粒物粒径分布系数影响较明显.二 英类物质实测浓度值为0.23~1.66 pg I-TEQ/m3.以TSP为载体AERMOD模拟浓度值为0.13~1.81 pg I-TEQ/m3,以PM10为载体模拟浓度为0.15~1.68 pg I-TEQ/m3.两参数对模拟结果产生的平均总不确定性分别为24.31%和12.43%.AERMOD模型模拟值与实测值相对差比值为0.01~0.89,PM10模拟浓度值比TSP模拟浓度值更接近于实测值.

Diffusion and transformation of PCDD/Fs of municipal waste incineration plant by using AERMOD model

In this paper, we predicted the diffusion and transformation of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) near one municipal solid wastes incineration plant by using U.S.EPA’S AERMOD model. Based on PCDD/Fs special characteristic with approximately 90%~100% particle-bound in the normal atmospheric temperature, TSP and PM10 were regarded as the transit particle carrier of PCDD/Fs. The results showed that 100% and 80% gas-particle partition setting exerted little influence on the PCDD/Fs air diffusion concentration and migration distance, on the contrary TSP and PM10 particle size distribution significantly affected the evaluated PCDD/Fs concentration. The observed PCDD/Fs concentration was 0.23~1.66 pg I-TEQ/m3, while the predicted concentration of TSP and PM10 transit particle carrier were 0.13~1.81 pg I-TEQ/m3 and 0.15~1.68 pg I-TEQ/m3, respectively. The average total uncertainties of the two parameters were 24.31% and 12.43% respectively. The relative difference ratio of the predicted and observed PCDD/Fs air concentration was 0.01~0.89. And the predicted result of PM10 was more related to the observed result than TSP’s.