利用新型可渗透反应格栅技术对垃圾渗滤液污染地下水过程作用研究

The remediation of leachate-polluted groundwater with permeable reactive barrier technology

以垃圾渗滤液污染地下水为研究对象,选择沸石、无烟煤、陶粒、活性炭、炉渣、粉煤灰、零价铁、石英砂作为填充材料,设计7种地下可渗透反应格栅（PRB）,分别为反应器1、2、3、4、5、6和7。通过连续实验模拟,对PRB技术治理污染地下水的可行性和有效性进行研究,监测反应器处理效果,分别7种反应器内流速、EC、Cl-的变化及对污染物去除效果及其影响进行分析,探索污染物去除机理。结果显示,反应器水渗流速度在80-150 cm.d-1情况下,对COD去除率为82.22%-88.88%,对Cl-去除率为-0.20%-1.68%,对色度去除率为36.38%-71.86%,表明利用新型PRB技术防控渗滤液污染地下水是可行的,但仍有些技术问题有待深入研究。

In this paper seven reaction media zero valent iron （ZVI）, activated carbon, zeolites, ceramsite, slag, anthracite, flyash were used to design seven kinds of permeable reactive barrier （PRB）, viz. reactors 1, 2, 3, 4, 5, 6 and 7. The feasibility and the efficiency of the PRB technology in the remediation of leachate-polluted groundwater were studied by successive experimental simulation. The removal effects to the pollutant of the reactors along with the variation of flow velocity,EC and C1- were analysed to explore the removal mechanism. The results indicated that the COD, CI and chroma removal ratios were from 82.22%-88.11%, 89.31%-93.65%, and 36.38%-71.86% respectively in case that the seepage velocity were from 80-150 cm.d-1. It can be indicated that PRB technology is an efficient method for the treatment of leachate-contaminated groundwater, though it is expected to do further research.