Assessing leachate contamination and groundwater vulnerability in urban dumpsites: a case study of the Ipata Area, Ilorin, Nigeria


  • N. K. Olasunkanmi Physics and Materials Science Department, Kwara State University, Malete. Nigeria
  • D. T. Ogundele Chemistry and Industrial Chemistry Department, Kwara State University, Malete. Nigeria
  • V. T. Olayemi Chemistry and Industrial Chemistry Department, Kwara State University, Malete. Nigeria
  • W. A. Yahya Physics and Materials Science Department, Kwara State University, Malete. Nigeria
  • A. R. Olasunkanmi Department of Environmental Impact Assessment and Management, School of Environmental, Education and Development, University of Manchester, United Kingdom
  • Z. O. Yusuf Physics and Materials Science Department, Kwara State University, Malete. Nigeria
  • S. A. Aderoju Department of Statistics and Mathematics, Kwara State University, Nigeria


Leachate contamination, Soil classification, Sustainable waste management, Groundwater quality monitoring


This study explores the extent of leachate contamination and groundwater vulnerability in urban dumpsites, with a specific focus on the Ipata area in Ilorin, Nigeria. The study employs a combination of 2D Electrical Resistivity Tomography (ERT), soil classification, and physicochemical analyses to investigate the percolation of leachate into groundwater and its potential environmental and health implications. The ERT data unveiled subsurface layers, highlighting the presence of decomposed topsoil down to approximately 1.2m. Beneath this layer, a low-resistivity zone (6.53 to 10.7 ?m) indicated the potential risk of leachate percolation into groundwater. Soil classification revealed a shallow topsoil layer with insufficient clay content to hinder leachate penetration, emphasizing the need for enhanced containment measures. Physicochemical analysis of leachate, well water, and soil displayed variations in key parameters such as pH, electrical conductivity, total dissolved solids, and anion concentrations. Leachate exhibited high pH and electrical conductivity, suggesting elevated total dissolved solids, while well water remained within acceptable pH limits for drinking water. Heavy metal concentrations exceeded permissible WHO limits in topsoil, leachate, and well water, with cadmium presenting a high ecological risk. The absence of persistent organic pollutants (POPs) in the samples indicates a current focus on heavy metals as a primary concern. In conclusion, this study underscores the urgent need for proactive pollution abatement measures in urban dumpsites like Ipata. Regular monitoring of surface and groundwater quality is essential to safeguard public health and the environment.


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Vertical pitting showing near-surface lithologic sequence beneath Ipata Market dumpsite around the dumpsite, non-degradable waste materials (topsoil), and near-surface leachate.



How to Cite

Assessing leachate contamination and groundwater vulnerability in urban dumpsites: a case study of the Ipata Area, Ilorin, Nigeria. (2024). Journal of the Nigerian Society of Physical Sciences, 6(2), 1889.



Earth Sciences

How to Cite

Assessing leachate contamination and groundwater vulnerability in urban dumpsites: a case study of the Ipata Area, Ilorin, Nigeria. (2024). Journal of the Nigerian Society of Physical Sciences, 6(2), 1889.