废弃物填埋场土壤污染分析及重金属离子化学形态健康风险评估  

ANALYSIS OF SOIL POLLUTION AND HEALTH RISK ASSESSMENT OF CHEMICAL FORMS OF HEAVY METAL IONS IN A LANDFILL SITE

作　　者：苗芳芳 张一梅 李鱼 林千果 MIAO Fangfang;ZHANG Yimei;LI Yu;LIN Qianguo(College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;Laboratory of Environment Remediation and Function Material,Suzhou Research Academy of North China Electric Power University,Suzhou 215213,China;College of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学环境科学与工程学院,北京102206 [2]华北电力大学苏州研究院环境修复与功能材料实验室,江苏苏州215213 [3]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《环境工程》2022年第7期94-100,共7页Environmental Engineering

基　　金：国家自然科学基金(51878272);国家重点研发计划项目(2018YFB0605504)。

摘　　要：为了减少固体废弃物填埋场对居民和环境的影响,以江苏省某固体废弃物填埋场为研究对象开展健康风险评估。采集研究区域土壤样品,分析As、Ni、Cd、Zn、Pb、Hg等重金属含量,分别应用克里金插值、化学质量平衡形态模拟、健康风险评估模型方法,对目标重金属浓度空间分布、重金属形态种类及区域健康风险水平进行研究。结果表明:该地区主要受固体废弃物填埋及农田过量施肥污染。其中,Cd和Zn含量均超过土壤背景值,汞含量接近背景值。模拟获得Cd金属形态15种,Zn金属形态21种,对金属形态浓度进行健康风险评估,得出CdCO_(3)、Cd^(2+)具有致癌风险,总贡献率分别为38.4%和31.9%;Zn_(2)S_(3)^(2-)具有非致癌风险,总贡献率为91.66%。Cd^(2+)的致癌风险值在10^(-6)~10^(-4),其致癌风险水平不可忽视。因此,研究区域重金属形态对人体的毒性应引起人们的重视。To reduce the impact of landfills on residents and the environment when performing landfill operation,a solid waste landfill site in Jiangsu Province was taken as the research object to carry out a health risk assessment.Soil samples in the study area were collected and analysed to obtain the contents of heavy metals such as As,Ni,Cd,Zn,Pb,and Hg.Kriging interpolation,chemical mass balance morphological simulation,and health risk assessment models were applied respectively.The concentration spatial distribution,speciation,and regional health risk of heavy metals were studied.The results showed that the area was mainly polluted by solid waste landfills and over-fertilization of agricultural land.The contents of Cd and Zn were higher than the soil background values,and Hg content was close to the background value.15 types of metal forms of Cd and 21 metal forms of Zn were obtained by simulation.A health risk assessment was conducted on the obtained metal species,and it was concluded that Cd^(2+)and CdCO_(3)had carcinogenic risks,with total contribution rates of 38.4%and 31.9%,respectively.But Zn_(2)S_(3)^(2-)metal form had non-carcinogenic risk,and the total contribution rate was 91.66%.The carcinogenic risk of Cd^(2+)ranged from 10^(-6)to 10^(-4),and that’s not ignorable.Therefore,the toxicity of heavy metal species to humans in the study area should be paid more attention to.

关 键 词：化学质量平衡 空间插值 金属形态 健康风险评估 

分 类 号：X53[环境科学与工程—环境工程] X820.4