The effect of landfill leachate pH to pollutants transport through landfill liners

In order to study the influence of landfill leachate pH to adsorption of Cr(VI) onto landfill liners, batch testing was carried out in laboratory. The result of batch testing showed that the adsorption of Cr(VI) onto landfill liner-soil material decreases dramatically with the increasing of the pH values. However, the initial rapid drcease in adsorption capacity moderates as the landfill leachate pH exceeds neutral. The relationship between of adsorption parameter (Qm, b) and landfill leachate pH values is linear. The numerical model of pollutants transport was developed, and Cr(VI) migration law through landfill liner was predicted by the model. The result of numerical simulation showed that Cr(VI) migration is influenced obviously by landfill leachate pH values. Hence, landfill leachate pH values must be considered in numerical simulation of pollutants transport.