再生水受水区浅层地下水质评价分析

Evaluation and analysis of shallowgroundwaterq uality in reclaimed water demand area

为了解再生水受水区浅层地下水质状况,以北京市引温济潮工程再生水受水区为研究区域,采集研究区内16眼监测井的30m深处浅层地下水样,选取TDS、COD_(Mn)、TH、Cl^(-)、SO_(4)^(2-)、NO_(3)-、F^(-)、Mn^(2+)、Fe^(2+)、Al^(3+)10个指标作为水质评价因子,通过单因子分析法、内梅罗综合指数法和加注评分法进行水质评价。研究区30m处浅层地下水质主要为Ⅲ~Ⅴ类水,其中以Ⅳ~Ⅴ居多,占比达到62.5%以上;2020年向阳闸附近水质略有好转;内梅罗综合指数法对浅层地下水污染程度的划分更细致。研究成果可为进一步了解引温济潮再生水受水区浅层地下水质状况提供理论参考。

In order to understand the quality of shallow groundwater in the reclaimed water demand area,the reclaimed water demand area of Beijing's Tidal Diversion Project is taken as the research area,shallow groundwater samples were collected from 16 monitoring Wells 30m deep in the research area.Ten indexes including TDS,COD_(Mn),TH,Cl^(-),SO_(4)^(2-),NO_(3)-,F^(-),Mn^(2+),Fe^(2+),Al^(3+)were selected as water quality evaluation factors,and water quality was evaluated by single factor analysis,Nemerow composite index method and injection scoring method.The results showed that the water quality of shallow groundwater at 30 m depth in the study area was mainly II~Ⅴ,among which Ⅳ~Ⅴ was the majority,accounting for more than 62.5%.In 2020,the water quality around Xiangyangzha was slightly improved.When evaluating the quality of shallow groundwater,the Nemerow composite index method divides the degree of pollution more carefully.The results of this study can provide theoretical reference for further understanding of the shallow groundwater quality of the reclaimed water receiving area.