某生活垃圾焚烧厂排放废气、飞灰、环境空气和土壤中各二噁英类单体分布特征  

Distribution characteristics of PCDD/Fs in waste gas,fly ash,ambient air and soil from a domestic waste incineration plant

作　　者：毛慧 张宗祥 于建飞 MAO Hui;ZHANG Zongxiang;YU Jianfei(Taizhou Environmental Monitoring Center of Jiangsu Province,Taizhou,225300,China;Jiangsu Province Ecology and Environment Protection Key Laboratory of Soil Organics Monitoring,Taizhou,225300,China)

机构地区：[1]江苏省泰州环境监测中心,泰州225300 [2]江苏省环境保护土壤有机污染物监测重点实验室,泰州225300

出　　处：《环境化学》2024年第8期2758-2768,共11页Environmental Chemistry

基　　金：农业农村部“十四五”国家科技支撑技术重点课题(NYKJ9204);江苏省泰州市科学技术局“2023年度科技支撑计划(社会发展)指令性项目”课题(TS202332)资助。

摘　　要：以某生活垃圾焚烧企业为研究对象,研究其烟道气废气、焚烧飞灰、企业周边环境空气和土壤中二噁英的水平和各二噁英类单体指纹分布特征,研究结果表明,废气中的二噁英呈现出冬季稍高于夏季的排放特征,呋喃对总∑TEQ的贡献率范围为72%-90%.飞灰作为垃圾焚烧中二噁英的主要捕集途径,TEQ浓度季度变化比废气更加明显,呋喃对总∑TEQ的贡献率范围为74%-81%.环境空气和土壤中二噁英的季度分布特征与废气、飞灰的分布特征一致,且主导风向土壤中二噁英的TEQ浓度明显高于次主导风向.环境空气单体指标中呋喃对总∑TEQ的贡献率与废气和飞灰规律一致,说明该区域环境空气中的二噁英与企业排放废气中的二噁英具有同源性.与废气、飞灰和环境空气相比,土壤中呋喃与二噁英的比值和呋喃对总∑TEQ的贡献率存在差异,说明土壤中的二噁英并非单一来源于企业排放废气.废气、飞灰、企业周边环境空气和土壤中的17种PCDD/Fs单体中含量最丰富的是O8CDD,PCDDs的浓度随着取代氯原子个数的增加而增大.17种PCDD/Fs单体中对毒性当量贡献最大的单体是2,3,4,7,8-P5CDF.2,3,7,8-T4CDD是引起废气中二噁英排放呈现出冬季稍高于夏季的特征污染因子,需要重点关注.A domestic waste incineration plant was used as a research object to study the levels of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)and the distribution characteristics of each monomer fingerprint in waste gas,fly ash,ambient air around the enterprise and soil.The results of the study showed that PCDD/Fs in waste gases showed a slightly higher emission profile in winter than in summer,with a range of 72%-90%contribution of PCDFs to the totalΣTEQ.As the main capture pathway for PCDD/Fs in waste incineration,The quarterly variation in TEQ concentrations for fly ash was more pronounced than for waste gas,with PCDFs contributions to the total ranging from 74%to 81%.The quarterly distribution characteristics of PCDD/Fs in ambient air and soil were consistent with those of waste gas and fly ash,and the TEQ concentrations of PCDD/Fs in soil in the dominant wind direction were significantly higher than those in the secondary wind direction.The contribution of individual PCDFs to the total of ambient air is consistent with the pattern of waste gas and fly ash,indicating that the PCDD/Fs in the ambient air of the region are homologous with those in the waste gas of the enterprises.The differences in the ratio of PCDFs to PCDD/Fs and the contribution of PCDFs to the total compared to waste gases,fly ash and ambient air suggest that PCDD/Fs in soils do not originate singularly from enterprise emissions.O8CDD was the most abundant of the 17 PCDD/Fs monomers in waste gas,fly ash,ambient air and soil.The concentration of PCDDs increases with the number of substituted chlorine atoms.Among the 17 PCDD/Fs monomers,2,3,4,7,8-P5CDF contributed the most to theΣTEQ.2,3,7,8-T4CDD is the characteristic pollutant that causes PCDD/Fs emission slightly higher in winter than in summer,and requires focused attention.

关 键 词：生活垃圾焚烧企业 二噁英 飞灰 环境空气 土壤. 

分 类 号：X-1[环境科学与工程] O6[理学—化学]