城市生活垃圾焚烧炉周边环境空气及土壤中二噁英来源研究

系统研究了某城市生活垃圾焚烧炉周边地区6个焚烧炉废气样品、14个环境空气样品和3个表层土壤样品中二噁英的组成及其含量,并对其来源进行了解析.结果表明,焚烧炉排放废气中二噁英含量较高,周边地区环境空气及主导风向下风向污染物最大落地点附近土壤中的二噁英含量均处于较低水平,且主导风向下游环境空气中二噁英含量与其它地点采集的样品中二噁英含量差别不明显,但最大落地点表层土壤样品与背景点表层土壤样品中二噁英的组成及含量均有一定的变化.主成分分析结果表明,最大落地点附近表层土壤样品中的二噁英可能受到了污染源废气排放的影响,但环境空气中二英类污染物来源较为复杂,具体原因还需进一步的深入研究.

Source identification for PCDD/Fs in ambient air and soil in the vicinity of a municipal solid waste incinerator

To investigate the sources of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) around a municipal solid waste incinerator (MSWI), we measured PCDD/Fs concentrations and profiles in 6 MSWI stack gas samples, 14 ambient air samples and 3 surface soil samples around the MSWI. Although the PCDD/Fs concentration of the MSWI was relatively high, the concentration of PCDD/Fs in the ambient air around the MSWI and the surface soil at the maximum deposition point was low. No significant differences were observed between the concentration of PCDD/Fs in the ambient air samples downwind of the MSWI in the dominant wind direction and air samples from other sites. However, the concentrations and profiles of PCDD/Fs in surface soil samples at the maximum deposition point were different from the background soil sample. According to principal component analysis (PCA), the PCDD/Fs in surface soil samples at the maximum deposition point might be partly from the dioxin emission of MSWI, but the sources of dioxin in ambient air are more complicated and need to be further studied.