Program: Collaborative Research for Alumni Members (CRA)

Field: Geological and Geo-Resource Engineering

Principal Investigator: Assoc. Prof. Dr. Wawan Budianta

Sending University: Universitas Gadjah Mada (UGM)

Japanese Co-Investigator: Prof. Dr. Hinode HIROFUMI

Japanese University: The University of Tokyo

Year: 2013


The disposal of solid waste leachate is an important component of integrated waste management with the main objective of preventing the contamination of soil, groundwater and surface waters by means of leachate resulting from the percolation of water through wastes moving into, through and out of the waste disposal migrating towards adjacent areas. Compacted clay liners providing low hydraulic conductivity values were extensively used to prevent rapid advective migration of various leachates from waste disposal sites, to cap new waste disposal units, and to close old waste disposal sites. Because the primary purpose of a compacted clay liner is to impede the flow of fluids, the most significant factor affecting its performance is its hydraulic conductivity. The results of these studies suggest that a systematic investigation be performed to determine the hydraulic conductivity of compacted clay liners as a function of geotechnical properties. The objective of this study, therefore, is to geologically and geotechnically evaluate the suitability of the Java claystone as a compacted clay liner to be utilized in future waste disposal so that it can reasonably be assured that the clay barrier will minimize preferential pathways which may lead to contamination. Practically, in order to reduce hydraulic conductivity increasing the water content and maintaining the wet condition is necessary. Under wet condition, clay aggregates are able to soften and undergoform and phase alteration that enables the aggregate to acts like clods. Plastic attributes allows it to deform and close adjacent inter-aggregate pores enhancing the decrease of the K values. Either by mechanically working the claystone or reducing the amount of coarse fraction is important to minimize the size of the inter-aggregate large pores, which lowers the mobility of the water, hence yield lower hydraulic conductivity values. By conducting research under AUN Seed Net, the network with Japanese Professor has been continued. This project enhance my knowlegde also my netwoeking as well. The student also get the benefit for this project by doing their thesis. This finding will be useful for local government to consider about environmental contamination on waste disposal site