利用淋溶实验研究某污染场地土壤对地下水水质的影响

A leaching experiment for impact of soil on groundwater quality in contaminated site

开展地下水污染调查、保护地下水环境已成为当务之急,对保障城市安全供水具有十分重要的意义。以某污染场地为研究对象,通过观察模拟不同水源形成的地表径流经不同深度土壤淋溶后的水质变化情况,研究不同土层对地下水水质的影响。结果表明土壤中存在大量的钙离子、镁离子以及硝酸盐氮等污染物,同时发现包气带土层对污染物的截留能力比表土层要强,表土层对淋溶液水质的影响比包气带土层要大。实例证明,将淋溶实验作为一种调查手段,在地下水污染调查工作的污染溯源阶段能够发挥一定的作用。

It is of great significance to carry out groundwater pollution investigation to protect groundwater environment and ensure safe water supply of cities. In this paper, the effect of different soil layers on groundwater quality is studied by carrying out leaching experiments to simulate the changes of water quality after surface runoff from different water sources is leached by soil at different depths. The results show that there are a large number of pollutants such as calcium ions, magnesium ions and nitrate nitrogen in the soil;the interception capacity of the soil layer to pollutants in the aeration zone is stronger than that of the topsoil;and the influence of the topsoil on the water quality of the leaching solution is greater than that of the soil layer in the aeration zone.The example demonstrates that the leaching experiment, as an investigation means, can play a role at the pollution traceability stage of groundwater pollution investigation.