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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

杨少博1,李江1,2**,张春辉1,吴永贵1,2,闫昌伦1   

  1. (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)
  • 出版日期:2015-06-10 发布日期:2015-06-10

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

YANG Shao-bo1, LI Jiang1,2**, ZHANG Chun-hui1, WU Yong-gui1,2, YAN Chang-lun1   

  1. (1College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China; 2Institute of Applied Ecology, Guizhou University, Guiyang 550025, China)
  • Online:2015-06-10 Published:2015-06-10

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(TEQBaP16)为0.09~0.29 mg·kg-1,其中7种致癌PAHs的毒性当量浓度占TEQBaP16的97%以上。TEQBaP10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。

 

关键词: 黑垆土, 土壤有机碳, 耕作模式, 水分利用效率, 团聚体

Abstract: 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 BaP (TEQBaP). The results showed that total PAHs concentrations in the samples were in the range of 1.90-4.27 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 (TEQBaP16) was in the range of 0.09-0.29 mg·kg-1, in which 97% of the total TEQBaP originated from 7 carcinogenic PAHs. The TEQBaP10 was 0.07-0.24 mg·kg-1, indicating higher carcinogenicity and ecological risk.

Key words: dark loessial soil, water use efficiency., tillage pattern, organic carbon, soil aggregate