地表污染渗滤液对地下环境的污染机理

应用实验的方法,研究了固体废物在地表淋滤条件下其淋滤液的成分变化特征,分析其变化的规律以及对地下环境的污染机理。结果表明,渗滤液中COD的变化主要在淋滤的早期阶段,下降幅度约为95%,而后期的变化相对较小。电导率、SO24-等污染指标的变化规律也有明显的阶段性,而变化幅度不相同,分别下降了49.4%和79.3%。在淋滤后期,COD的浓度仍较大,说明淋滤过程中的有机物降解较慢,所以对地下环境影响时间较长而应予以重点防治,而SO42-等在后期下降到较低水平,对地下环境的影响较小。

Pollution Mechanism of Leaches of Solid Wastes from the Earth Surface on Underground Environment

The characteristics of leaches of solid wastes from the earth surface,the law of leaches change and pollution mechanism on underground environment are studied by means of experiments.The results indicated that the COD of the leaches changed mainly in the early stage,decreasing about 90%,but the changing in later period was relatively small.The change law of some pollution indexes such as electric conductivity and SO varied with different phases,being 49.4% and 79.3% respectively.The COD was still relatively big in the last period,showing that the organic matter degraded slowly in the leaching course,so it could impact underground environment relatively longer and should be prevented and cured especially.The densities of SO decreased to a lower level in later stage,which had a little effect on underground environment.