摘要
氯代有机物降解难、毒性大,填埋场是氯代有机物的重要汇集地。针对填埋场渗滤液泄漏进入地下水中氯代有机物风险不明现状,采集了一个非正规填埋场的地下水样品,并结合收集的中国、德国、美国、西班牙、波兰、挪威共6个国家13个填埋场附近地下水氯代有机物组成与浓度数据,采用风险评价模型对其健康风险进行评估。结果显示:所研究填埋场地下水总共检出10类41种氯代有机物,这些氯代有机物中,氯代环烷烃类的致癌风险最大,均超过了10^(-4),远超人体可接受的水平,具有明确风险;氯代多氟烷基醚磺酸盐的F-53B的致癌风险最低,为10^(-6)~10^(-4),具有可能致癌风险。氯代烷烃类的非致癌风险最大,其中α-六氯环己烷的非致癌风险值均超过1,超过人类可接受水平;而氯代有机农药类如丙环唑和氯菊酯的非致癌风险最低,其非致癌风险值未超过人体可接受的水平。需要加强关注γ-六氯环己烷、氯苯、1,2-二氯苯等氯代有机物风险管控,可采用氧化脱氯、还原脱氯及共代谢脱氯等途径,加速其脱氯和降解,消除其风险。
Chlorinated organic compounds are difficult to degrade and highly toxic,and landfills are important gathering places for chlorinated organic compounds.To evaluate the uncertain risk of landfill leachate contaminating groundwater with chlorinated organic compounds,a groundwater sample was collected from an informal landfill site.Combined with the collected data on the composition and concentration of chlorinated organic compounds in groundwater near 13 landfills in 6 countries including China,Germany,the United States,Spain,Poland,and Norway,a risk assessment model was used to assess their health risks.A total of 41 different types of chlorinated organic compounds,categorized into 10 classes,were identified in the groundwater near the landfills studied.The chlorinated cycloalkanes pose the highest carcinogenic risk,with all measurements surpassing 10^(-4),far exceeding the tolerable limits for human exposure,and presenting significant health hazards.The F-53B of chloropolyfluoroalkyl ether sulfonate has the lowest carcinogenic risk,between 10^(-6) and 10^(-4),and has a possible carcinogenic risk.The non-carcinogenic risk of chlorinated alkanes is the highest,among which the noncarcinogenic risk value ofα-hexachlorocyclohexane(HCH)exceeds 1,more than the acceptable level for human beings.However,chlorinated organic pesticides such as propiconazole and permethrin have the lowest non-carcinogenic risk,and their non-carcinogenic risk value does not exceed the acceptable level for human body.Greater emphasis should be placed on risk management strategies for specific chlorinated organic compounds,namelyγ-HCH,chlorobenzene,and 1,2-dichlorobenzene.Various methods,including oxidative dechlorination,reductive dechlorination,and co-metabolism dechlorination,can be employed to expedite the dechlorination and degradation processes,ultimately eliminating associated risks.
作者
郑敬
潘琦
王玉欣
沙浩群
王宪革
刘洪宝
何小松
ZHENG Jing;PAN Qi;WANG Yuxin;SHA Haoqun;WANG Xiange;LIU Hongbao;HE Xiaosong(College of Environmental Science and Engineering,Guilin University of Technology;State Key Laboratory of Environment Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences;State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2024年第1期89-97,共9页
Journal of Environmental Engineering Technology
基金
国家自然科学基金项目(52070174)。
关键词
氯代有机物
地下水
填埋场
健康风险评估
chlorinated organic compounds
groundwater
landfill
health risk assessment
