Author(s): Tanya Splajt
Linked Author(s):
Keywords: Leachate migration; Municipal landfill site management; Hydrology; Water pollution control; Hydro-geology
Abstract: Contamination of water resources by landfill leachate is a growing problem. Waste management companies often struggle with the challenge of containing and controlling leachate migration. This case study of a landfill site in Northern England is an example of post-management problems that can occur after leachatecontainment structures are implemented within a landfill site. The case study site was identified as a regional threat in 1992. Leachate containment structures built in recent years have improved water quality conditions however problem areas within the site continue to exist. This investigation reviews the geologic and hydrologic site conditions. The SEEP/w hydro-geologic model was used to construct a finite element, two-dimensional simulation of the problem area on site. Conclusions were formed by integrating data analysis findings and SEEP/w sensitivity analysis. The analysis found that high water table levels on site are causing the leachate management structures to under-perform. Leachate from the landfill is migrating through and bypassing containment walls and re-circulation systems resulting in local and downstream surface and groundwater contamination. Landfill leachate migration is a long-standing problem that is expected to increase with the growth of urban populations and resulting landfills. This study points to the importance of understanding the hydro-geologic composition of a landfill and recognising the geophysical limitations of engineered pollution control systems. These are integral issues that will determine the effectiveness of leachate management strategies used in municipal landfill sites.
Year: 1999