生态环境学报 ›› 2022, Vol. 31 ›› Issue (2): 391-399.DOI: 10.16258/j.cnki.1674-5906.2022.02.020

• 研究论文 • 上一篇    下一篇

典型煤炭产业聚集区土壤重金属污染特征与风险评价

刘娣1(), 苏超1,*(), 张红2, 秦冠宇2   

  1. 1.山西大学黄土高原研究所/黄土高原生态恢复山西省重点实验室,山西 太原 030006
    2.山西大学环境与资源学院,山西 太原 030006
  • 收稿日期:2021-08-18 出版日期:2022-02-18 发布日期:2022-04-14
  • 通讯作者: *苏超(1989年生),女,讲师,博士,主要从事污染物环境行为模拟和风险评价的研究。E-mail: suchao@sxu.edu.cn
  • 作者简介:刘娣(1995年生),女,硕士研究生,主要从事污染生态学方面研究。E-mail: ld710816@163.com
  • 基金资助:
    山西省重点研发计划(201903D321071);国家自然科学基金联合基金重点项目(U1910207);山西省高等学校科技创新项目(2019L0017)

Pollution Characteristics and Risk Assessment of Heavy Metal Pollution in A Typical Coal-based Industrial Cluster Zone

LIU Di1(), SU Chao1,*(), ZHANG Hong2, QIN Guanyu2   

  1. 1. Shanxi Key Laboratory of Ecological Restoration on Loess Plateau/Institute of Loess Plateau, Shanxi University, Taiyuan 030006, P. R. China
    2. College of Environment & Resource Sciences of Shanxi University, Taiyuan 030006, P. R. China
  • Received:2021-08-18 Online:2022-02-18 Published:2022-04-14

摘要:

山西作为中国重要的煤炭能源基地,为中国经济作出巨大贡献的同时也造成了一系列的生态环境问题,例如土壤污染、地下水资源破坏、土地塌陷、水土流失等,给山西省的生态环境带来严峻的挑战。其中,土壤重金属污染(如Cr、As、Cd、Pb和Hg等)尤为突出,因此,研究煤炭产业聚集区土壤重金属的累积特征与风险评价对土壤修复具有重大意义。以山西长治市典型煤炭产业聚集区为研究区,系统解析不同类型企业(钢厂、采煤厂、选煤厂、洗煤厂、化工厂、焦化厂和燃煤电厂)周边土壤重金属元素的累积特征及差异性,采用内梅罗综合污染指数法和Hakanson潜在生态风险指数法评价不同类型企业周边土壤重金属的污染程度和生态风险,阐明土壤重金属污染的空间分布格局与扩散趋势。结果表明:研究区土壤中8种重金属Cr、Ni、Cu、Zn、As、Cd、Pb和Hg的平均含量分别为64.14、37.46、29.62、80.92、17.62、0.27、24.05和0.05 mg∙kg-1,均高于山西省土壤元素背景值;Cr、Ni、Cu和Zn在不同类型企业周边土壤中存在显著差异。生态风险评价结果表明,选煤厂、燃煤电厂、化工厂和钢厂周边土壤中重金属的内梅罗综合污染指数均达到重度污染,分别为4.63、3.30、9.12和3.58;化工厂周边土壤中重金属的生态风险指数最高,为589.53,属于强生态风险。空间分析表明,除As元素外,其他土壤重金属的浓度在空间上整体呈现出北部、中部高的分布格局;综合潜在生态风险指数IR和Hg的空间分布格局相似,高风险区集中在研究区西北部某燃煤电厂周边,属于强生态风险水平。该文的研究结果可为山西省的土壤重金属污染防治和修复提供重要的数据支撑。

关键词: 煤炭产业, 不同类型企业, 土壤重金属, 污染特征, 空间分布, 风险评价

Abstract:

As an important coal energy base in China, Shanxi has made great contributions to China's economy, but also caused a series of ecological and environmental problems, such as soil pollution, groundwater damage, land subsidence, and soil erosion. Among these serious challenges, soil heavy metal pollution (e.g. Cr, As, Cd, Pb and Hg) is particularly prominent. Therefore, it is of great significance to study the accumulation characteristics and risk assessment of soil heavy metals in coal-based industrial clusters for soil remediation. Choosing the typical coal industry cluster in Changzhi city as the research area, this study analyzed the differential accumulation characteristics of eight heavy metals (Cr, Zn, As, Cd, Pb, Hg, Ni and Cu) in soils surrounding different types of enterprises (i.e., steel plant, coal mining plant, coal preparation plant, coal cleaning plant, chemical plant, coal-fired power plant, and coking plant) to clarify the spatial distribution pattern and diffusion trend of soil heavy metal pollution. The Nemerow comprehensive pollution index and Hakanson potential ecological risk index were adopted to evaluate the pollution degree and ecological risk of heavy metals in soils surrounding different types of enterprises. The results showed that the concentrations of eight heavy metals (Cr, Ni, Cu, Zn, As, Cd, Pb and Hg) were all higher than the background values of soil elements in Shanxi Province. Specifically, the average values were 64.14, 37.46, 29.62, 80.92, 17.62, 0.27, 24.05, and 0.05 mg∙kg-1, respectively. Cr, Ni, Cu and Zn were significantly different in the surrounding soils of different types of enterprises. The ecological risk assessment results showed that the Nemerow comprehensive pollution index of heavy metals in the soil surrounding coal preparation plants (4.63), coal-fired power plants (3.30), chemical plants (9.12), and steel plants (3.58) had all reached the heavy pollution level; The ecological risk index of heavy metals in soils surrounding the chemical plants was 589.53, above the high ecological risk value. Spatial analysis results showed that the heavy metal pollution in the soil was concentrated in the northern and central regions in this study except for As; the spatial distribution patterns of the comprehensive potential ecological risk indices, IR and Hg, were similar, and the high-risk areas were concentrated in the northwest of the study area. This study could provide data support for the prevention and restoration of soil heavy metal pollution in Shanxi Province.

Key words: coal industry, different types of enterprises, soil heavy metals, pollution characteristics, spatial distribution, risk assessment

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