Leachate transport through municipal solid waste (MSW) landfill liners can be slowed considerably by adsorption. MSW landfill leachate contains a large variety of pollutants at very different concentrations, and there will be competitive adsorption as these pollutants are transported through the landfill’s compacted clay liner (CCL). In this study, we used batch adsorption tests and geotechnical centrifuge modelling to examine how the adsorption of pollutants commonly found in leachate changed under competitive adsorption conditions and how competitive adsorption affected the CCL breakthrough of multiple pollutants. The results showed that the adsorption of the target pollutant on clay decreased by approximately 30% when competing pollutants were added. The speed at which the pollutants were transported through a 2-m-thick CCL increased, and the breakthrough times reduced by up to 24.8%, when the competing pollutants were mixed. Competitive adsorption significantly promoted the CCL breakthrough of pollutants at low concentrations, but it had limited effect on pollutants at high concentrations.

通过市政固体废物（MSW）垃圾填埋场衬里的渗滤液运输可通过吸附而大大减慢。MSW垃圾填埋场渗滤液中含有多种浓度非常不同的污染物，当这些污染物通过垃圾填埋场的压实粘土衬里（CCL）传输时，将具有竞争性吸附作用。在这项研究中，我们使用批吸附试验和岩土离心机模型研究了在竞争性吸附条件下渗滤液中常见污染物的吸附如何变化以及竞争性吸附如何影响多种污染物的CCL突破。结果表明，加入竞争性污染物后，目标污染物在粘土上的吸附降低了约30％。污染物通过2米厚的覆铜板运输的速度有所提高，当混合竞争污染物时，突破时间减少了高达24.8％。竞争性吸附显着促进了低浓度污染物的CCL突破，但对高浓度污染物的影响有限。