某大型焦化厂地块土壤中PAHs分布特征

doi:10.19741/j.issn.1673-4831.2021.0564

摘要/Abstract

摘要： 该研究检测了某大型焦化厂地块土壤中被列入美国环保局优控名录中的16种多环芳烃（polycyclic aromatic hydrocarbons，PAHs）含量，分析了16种PAHs在该厂不同功能区的垂直和水平含量分布特征，并对其生态风险及来源进行了分析。结果表明：（1）该厂区16种PAHs总量最大值位于土法炼焦区，为47 912.23 mg·kg^-1，；土法炼焦区、化产区土壤中PAHs含量较高，以萘为主，且总体来看<3 m土壤中PAHs含量较高。（2）不同功能区生态风险排序为土法炼焦区>化产区>焦炉区>煤场>办公区。（3）通过低环（2~3环）和中高环（4~6环） PAHs含量比值分析，化产区PAHs主要来源于生产过程焦油泄露，焦炉区、煤场和办公区PAHs主要来源于焦炉产生的煤烟类物质的沉降作用等，土法炼焦区上述2种来源均涉及。

关键词: 焦化厂, 土壤, 多环芳烃, 生态风险, 来源

Abstract: Contents of 16 polycyclic aromatic hydrocarbons(PAHs) listed for prior control by USEPA in soil samples from a large coking plant site were detected. The characteristics of horizontal and vertical distribution of the 16 PAHs were discussed, while their ecological risk and sources were investigated. Results show that:(1) The total PAHs(ΣPAHs) contents ranged from 0-47 912.23 mg·kg^-1 with a maximum of ΣPAHs in indigenous coking area; Moreover, the contents of ΣPAHs in indigenous coking area, chemical production area were higher than those in other areas,which were mainly made up of naphthalene; Besides, the contents of ΣPAHs in <3 m depth soil were higher than those in the subsoil. (2) The ecological risk sequence in different areas showed indigenous coking area> chemical production area> coking area> coal yard> office area. (3) The content ratios of total 2-3 rings PAHs and 4-6 rings PAHs revealed that the PAHs in chemical production area were mainly originated from coal tar leaking, while the PAHs in coking area, coal yard and office area mainly from soot deposition made by coking. In addition, the PAHs in indigenous coking area were mainly from both coal tar leaking and soot deposition.

Key words: coking plant, soil, polycyclic aromatic hydrocarbons(PAHs), ecological risk, sources

中图分类号:

李群, 李梅, 李杨, 周艳, 邓绍坡, 张胜田, 范婷婷, 吴运金. 某大型焦化厂地块土壤中PAHs分布特征[J]. 生态与农村环境学报, 2021, 37(12): 1623-1632.

LI Qun, LI Mei, LI Yang, ZHOU Yan, DENG Shao-po, ZHANG Sheng-tian, FAN Ting-ting, WU Yun-jin. Analysis on Distribution Characteristics of Soil Polycyclic Aromatic Hydrocarbons(PHAs) in a Large Coking Plant Site[J]. Journal of Ecology and Rural Environment, 2021, 37(12): 1623-1632.

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