基于综合评分法筛选填埋场周边浅层地下水优控有机污染物研究

Study on the PCOPs in shallow groundwater around landfill sites based on comprehensive scoring method

填埋场周边浅层地下水有机污染物的研究已成为地下水污染防治的关键,现存在研究缺乏、检测难以涵盖和识别难以准确的典型特征,优控有机污染物(PCOPs)的筛选尤为重要。以长三角某特大城市填埋场周边浅层地下水为研究对象,基于“源—路径—受体”思路,采用综合评分法构建了ITD指标模型,初始名单中68种有机污染物综合得分为49.31~167.77,通过K均值聚类分析筛选出高、中、低3个级别地下水PCOPs:包括14种高级别优控有机污染物(HPCOPs)、39种中级别优控有机污染物(MPCOPs)、15种低级别优控有机污染物(LPCOPs);HPCOPs与国内外研究清单、标准以及实际污染特征均具有较好的一致性;针对性提出PCOPs地下水污染防控措施,建议将HPCOPs纳入“填埋场周边浅层地下水PCOPs清单”。研究成果为填埋场浅层地下水PCOPs的筛选提供了新思路,为污染防治提供了理论依据。

The study of organic pollutants has become critical for pollution prevention and control in shallow groundwater around landfills.Currently,there were typical challenges,including poor in research,difficulty in detecting,and obstacle in identifying accurately,making the screening of PCOPs particularly important.Based on the concept of“source-path-receptor”,an ITD model was constructed using a comprehensive scoring method,taking the shallow groundwater around landfills in a major city in the Yangtze River Delta as the research object.The comprehensive scores of 68 types of organic pollutants in initial list ranged from 49.31 to 167.77.K-means clustering analysis was used to screen out three levels of PCOPs,by which 14 types of HPCOPs,39 types of MPCOPs and 15 types of LPCOPs were screened out.HPCOPs had good consistency with domestic and foreign research inventory,standards,and actual pollution characteristics.Targeted measures were proposed to prevent and control pollution of PCOPs,and recommended that HPCOPs could be listed in the“inventory of shallow groundwater PCOPs around landfills”.The research results provided new ideas for the screening of PCOPs in landfills and theoretical basis for the pollution prevention and control of shallow groundwater around landfills.