GCL对垃圾渗滤液中阳离子和有机质的吸附能力

Adsorption ability of geosynthetic clay liner to cations and organics in landfill leachate

摘要: 通过对渗透前后垃圾填埋场渗滤液进行化学成分的测定和分析,研究了GCL的吸附能力及其变化规律,并采用X射线荧光光谱分析对试验结果进行了验证。研究结果表明在渗透过程中GCL对渗滤液中的有机物和阳离子存在吸附作用,水化液对GCL的吸附能力有一定影响;在渗透开始阶段,GCL对垃圾渗滤液中阳离子和有机物的吸附能力比较强,而后逐渐达到吸附饱和状态而丧失吸附能力,因此用GCL作为防渗屏障,主要是依靠其低渗透特性,而非其对溶液中有机质和有害离子的吸附作用。通过对膨润土进行X射线荧光光谱分析也发现:经过渗透后的膨润土中除常见氧化物外,还有来自渗透液中被吸附的物质,但含量不大。

Abstract: The adsorption ability of geosynthetic clay liner(GCL) and its variation were explored through test and analysis of chemical compositions in the landfill leachate before and after permeation.The results were demonstrated by X-ray fluorescence spectrometry analysis.It was found that GCL’s adsorption to most of cations and organics occurred during the permeation process of landfill leachate through GCL.The difference of hydration liquid had some influences on the adsorption ability of GCLs.Test re...