Hydrogeological Control on Fate and Processes of Heavy Metal and Organic Chemical Contaminants from Landfill, Case Study: Piyungan Landfill, Yogyakarta Special Province, Indonesia

• Main Authors: , Keophousone Phonhalath, , Prof. Dr. Dwikorita Karnawati
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2012
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/97939/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54502
• Institution: Universitas Gadjah Mada

This research focuses on hydrogeological factors controlling groundwater contaminant movement from the landfill site. The objectives of this study were to provide an understanding of the local hydrogeological conditions which influence to contaminant transport. In other hand, the providing of understanding on geochemical, biogeochemical processes must be analyzed which control the concentration of contaminants concentration. This research was applied an analytical method model for one-dimensional solute transport, a two dimensional solute transport numerical model. Finite difference method was used to solve the partial differential equations of flow and transport. Method of characteristic (MOC) was applied to solve the advection part of the solute transport equation. On other hand, the growth of heterotrophic bacteria under aerobic and anaerobic conditions was considered in the two dimensional bacteria mediated reduction model in which the advection part of the solute transport was solved by method of characteristics (MOC) while the rest of processes including reaction terms were solved by finite difference method. Switching function and inhibition coefficients were used to control the sequence of reduction reactions. The bacterial growth was formulated by the double Monod kinetic equation. Three bacteria (X1, X2, and X3) groups were defined in the redox model. The two dimensional vertical groundwater flow simulation is to show the movement of the groundwater flow system. The two permeability values show that flow velocity (Darcy�s velocity) depends on permeability of lithology and hydraulic gradient. K1 is higher than K2, thus the flow velocity in K2 zone is lower than K1 zone. And the flows from K1 to K2 slowly which move angled direction, this step applied a two-dimensional vertical flow numerical model. At the second step, the solute transport model is to show the analysis of plume of solute transport. The plume was influenced by water flow movement in subsurface. Advection and dispersion are sufficiently slow and mechanisms for adsorption are sufficiently effect lead migration to groundwater. Lead introduced into the groundwater near Piyungan landfill rapidly and completely attenuated. In the last step of this research the growth of heterotrophic bacteria under aerobic and anaerobic conditions was considered in the two dimensional bacteria mediated reduction model which was applied in the present study. The model parameters applied in the simulation were obtained from field observations, literature review and tuning by trial and error method. seen on the reduced environment between 0-0.7 m. The oxygen (O2) on surface can move downward by infiltrated water as 8 mg/L, and CH2O from mobile phase which supports bacteria X1 to grow in freshwater CH2O was considered as the electron