地下水过度开采引起的六价铬污染问题研究

在无地表铬污染源的情况下,研究区从1997年到2010年间地下水中六价铬的检出率不断增大,超标率逐年升高,本次研究针对此现象进行了探讨。根据研究区近年来对地下水开发利用强度加大的实况,在分析历年水位及水质资料,通过试验研究非饱和带与饱和带松散沉积层土壤中六价铬的含量及其平面、剖面的分布特征的基础上,进行了地下水位动态特征与六价铬浓度变化规律之间在时空演变上的相关性分析。并通过回归分析建立回归模型,明确了地下水水位降低与六价铬浓度增加之间的非线性相关关系,探明了地下水过度开采引起六价铬污染的形成演化规律,并对地下水环境中六价铬的修复提供相关依据。

Research on the Hexavalent Chromium Pollution Problem Caused by Groundwater Overexploitation

This paper discusses the reason why the detection rates and the over-standard rates of hexavalent chromium in groundwater are con-tinuously rising year after year in the case of no chromium surface pollution between 1997 and 2010 in research area. According to the re-search area status of the serious intensity groundwater exploitation and utilization in recent years, the water level and quality dates are ana-lyzed. Based on the experimental research on the plane and section content of hexavalent chromium in soil and its distribution characteristic both in unsaturated and saturated zone unconsolidated sediments, the correlation between the underground water level dynamic characteristics and the time and spatial evolution of hexavalent chromium concentration change regularity is studied, and a regression model is established through the regression analysis. The results show that there is a nonlinear relationship between the decrease of groundwater levels and the in-crease of hexavalent chromium concentration, and the research also makes clear the effect of groundwater overexploitation on the transforma-tion and migration of hexavalent chromium in the groundwater and provides an available basis for the restoration of hexavalent chromium in the groundwater environment.