摘要
根据二噁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为载体模拟二噁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噁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.二噁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.
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 PMl0 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 PMI0 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.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2013年第6期985-992,共8页
China Environmental Science
基金
国家"863"项目(2011AA060605)
环保公益性行业科研专项经费资助项目(201209022)
