贵阳市城市污泥中多环芳烃的分布特征、来源解析及风险评价  

Distribution,sources and risk assessment of polycyclic aromatic hydrocarbons( PAHs) in sewage sludge from Guiyang City

作　　者：杨少博[1] 李江[1,2] 张春辉[1] 吴永贵[1,2] 闫昌伦 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550025 [2]贵州大学应用生态研究所,贵阳550025

出　　处：《生态学杂志》2015年第6期1675-1681,共7页Chinese Journal of Ecology

基　　金：贵州省科技厅;贵州大学联合资金计划项目(黔科合LH字[2014]7652);贵州大学研究生创新基金项目(研理工2014014)资助

摘　　要：选择贵阳市5个污水处理厂的污泥为研究对象,采用索氏提取和GC-MS方法检测了不同污水处理厂污泥中美国环保局（US EPA）优先控制的16种多环芳烃（PAHs）含量,通过特征分子比值法和PAHs的毒性当量分别对污泥中PAHs的来源及其生态风险进行解析和评估。结果表明,5个污水处理厂污泥中16种PAHs的总和（∑PAHs）的含量为1.90～4.27 mg·kg-1,低于部分较发达国家及城市,且以2～4环PAHs为主,占∑PAHs的83.0%～90.2%。来源示踪结果显示,污泥中PAHs来源以木材和家庭燃煤为主,兼有汽车尾气排放的特征。风险评价表明,污泥中16种PAHs的毒性当量浓度（TEQBa P16）为0.09～0.29 mg·kg-1,其中7种致癌PAHs的毒性当量浓度占TEQBa P16的97%以上。TEQBa P10的浓度范围为0.07～0.24 mg·kg-1,远远超出荷兰农业土壤的标准。Sixteen US EPA priority polycyclic aromatic hydrocarbons（ PAHs） in sewage sludge from 5 wastewater treatment plants in Guiyang City,Southwest China,were analyzed using Soxhlet-extraction and GC-MS method. Possible sources were identified using the diagnostic ratios of PAHs and potential risks were assessed based on the toxic equivalent concentration of Ba P（ TEQBa P）. The results showed that total PAHs concentrations in the samples were in the range of1.90-4.27 mg ·kg-1,which was lower than those of the most of well developed countries and areas. PAHs in the sewage sludge were dominated by 2-4 rings PAHs and mainly stemmed from biomass burning and domestic coal combustion,with some characteristics of vehicle emission.The risk assessment showed that the toxicity equivalent concentration of PAHs（ TEQBa P16） was in the range of 0.09-0.29 mg·kg-1,in which 97% of the total TEQBa Poriginated from 7 carcinogenic PAHs. The TEQBa P10 was 0.07-0.24 mg·kg-1,indicating higher carcinogenicity and ecological risk.

关 键 词：城市污泥 多环芳烃 分布特征 来源解析 风险评价 

分 类 号：X703[环境科学与工程—环境工程] X820.4