某铅锌尾矿库对地下水环境影响及防治措施

摘要

The leaching solution of Lead-Zinc contains heavy metals and other pollution factors that have a major impact on groundwater environment. To the basis of local hydrogeological conditions, in the paper the extent and scope of the ground-water environmental impact in different operating conditions was analyzed through the use of GMS that a professional software in hydro-geological numerical simulation. The results showed that the infiltration capacity of leaching solution is 2. 8m3/d under impermeable layer intact condition and the regional groundwater does not exceed of “groundwater quality standards” . The re-sults showed that the infiltration capacity of leaching solution is 97. 22m3/d under impermeable layer 10% damaged condition. In this condition, Pb beyond class Ⅲ rank of“groundwater quality standards” in downstream side 50m range, and the super-scalar range is 0. 0375km2. It is reflect that seepage control measures is an important guarantee for groundwater environmental protection.%铅锌尾矿的浸出液中含有重金属等对地下水环境有重要影响的污染因子。利用地下水数值模拟专业软件GMS,结合研究区水文地质条件,对不同工况下地下水环境的影响程度及范围进行模拟计算。结果表明,达到Ⅱ类工业固体废弃物处置场规定的防渗要求条件下,尾矿库运行浸出液下渗量有限(2.8 m3/d),并不会使区域地下水超出《地下水质量标准》Ⅲ类标准,而防渗层仅出现10%破损时,浸出液下渗量为(97.22 m3/d),使地下水下游方向50 m内地下水中Pb超出Ⅲ类标准,超标范围约0.0375 km2。反映出该类处置场中的防渗措施是对地下水环境保护的重要保证。