EFFECT OF LEACHATE ON THE COMPACTED SOIL AS A LINER MATERIAL

Abstract

With the increase of waste generation and the need of the containment of waste to avoid ground water contamination effective liner system are inevitable. Due to shortage of the suitable material or its non availability, it is necessary to develop certain alternative material for the liner system. In this project, local soil of DTU is proposed for the liner system. The properties of the soil are altered by adding bentonite to get the desired least permeability. Further, the effect of leachate on the proposed soil is studied. A column study is being carried out to study short term effect of leachate on the soil. First a short term test is carried out by mixing the soil with leachate for 2-3 days and then finding out the change in properties. Secondly, a long term test was carried out using a column study in which the soil is compacted at its MDD and OMC and the leachate is permeated and kept for a month or two. Then the change in the properties is determined. Change in the properties, change in internal structure if any, and change in the hydraulic conductivity of the soil is determined. Atterberg limit test to determine the change in properties was done and XRD to find the change in internal structure was done and falling head test for the hydraulic conductivity. It can be seen that leachate does change the properties of the soil, internal structure and also the hydraulic conductivity.