摘要
为探究垃圾填埋场渗滤液泄漏区域土壤重金属空间分布特征及对人体健康的风险,采用网络并行电法技术获取渗滤液潜在泄漏范围及其空间分布特征,在此基础上指导研究区域土壤样品采集工作。为进一步分析渗滤液泄漏造成的重金属污染状况及健康风险,分别对样品中的Cu、Pb、Zn、Ni、Cr、Cd、As和Hg含量进行测定。结果表明:区域内土壤重金属含量分布与电阻率剖面特征具有较好的一致性,重金属含量较高区域表现为明显的低电阻率异常,如土壤采样点S22、S23等区域;重金属含量平面分布特征表现为中部区域含量低周边高,同时内梅罗综合指数及综合潜在生态风险指数表明研究区整体污染水平较低,但Cd、Hg具有较高的潜在生态风险,垃圾渗滤液泄漏是导致该区域风险等级提高的主要原因;健康风险评价数据表明研究区重金属主要暴露途径为经口摄入,单纯某种重金属不会对当地居民构成非致癌风险,但Ni、Cr和As存在一定致癌风险。研究结果可为垃圾填埋场渗滤液泄漏调查评估和重金属污染防控提供科学依据。
In order to investigate the spatial distribution characteristics of heavy metals in the leachate leakage area of landfills and the risk to human health,the potential leachate leakage range and its spatial distribution charac-teristics were obtained by using the network parallel electrical technique,and based on which the soil sample collec-tion in the study area was guided.For further analysis of the heavy metal pollution status and health risk caused by leachate leakage,the contents of Cu,Pb,Zn,Ni,Cr,Cd,As and Hg in the samples were measured,respectively.The results showed that:the distribution of soil heavy metal content in the region had good consistency with the resistivi-ty profile characteristics,and the areas with high heavy metal content showed obvious low resistivity anomalies,such as soil sampling points S22 and S23,etc.;the planar distribution of heavy metal content was characterized by low content in the central region and high content in the periphery,meanwhile the Nemerow comprehensive pollution index and the comprehensive potential ecological risk index indicated that the overall pollution level in the study area was low and light,but Cd and Hg had high potential ecological risks,and the leakage of waste leachate was the main reason for the increase of risk level in the area.The health risk assessment showed that the oral intake was the most important exposure route for carcinogenic and non-carcinogenic risks,and single heavy metals do not pose non-carcinogenic risks to local residents,but Ni,Cr and As had some carcinogenic risks.The results of the study can provide a scientific basis for landfill leachate leakage investigation and heavy metal pollution prevention.
作者
刘洋洋
尹奇峰
倪圣军
陈思远
张立好
LIU Yangyang;YIN Qifeng;NI Shengjun;CHEN Siyuan;ZHANG Lihao(School of Resources and Environmental Engineering,Anhui University,Hefei 230601;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026;Anhui Huizhou Geology Security Institute Co.,Ltd.,Hefei 230000)
出处
《安徽农业大学学报》
CAS
CSCD
2023年第6期1021-1029,共9页
Journal of Anhui Agricultural University
基金
安徽省重点研究与开发计划(2022m07020008)
国家自然科学基金(41807296)
合肥市学术技术带头人及后备人选和博士后研究人员科研活动经费资助项目(2021201)
中国博士后科学基金面上项目(276665)
安徽省高校自然科学研究项目重点项目(KJ2021A0084)共同资助。
关键词
垃圾填埋场
重金属
渗滤液
网络并行电法
健康风险评价
landfill
heavy metals
leachate
network parallel electrical technique
health risk assessment
