Investigation of leachate migration using electrical resistivity imaging: a case study from an active dumpsite, ilokun, ado-ekiti, Southwest Nigeria
Abstract
Geophysical study involving electrical resistivity imaging was conducted at Ilokun municipal solid waste disposal site in Ado-Ekiti, Southwest Nigeria. The study was designed to map the leachate accumulation and extent of migration of leachate plumes in the subsurface. Leachate generated from dumpsite has been recognized as a major concern to public health. Three 2D resistivity profiles were established, one within and two outside the dumpsite. A traverse length of 140 m was kept for the survey. The apparent electrical resistivity data were subsequently inverted into the true electrical resistivity distributions using RES2DINV software to obtain the subsurface image. Electrical Resistivity Imaging (ERI) revealed leachate accumulation (low resistivity zones of 4.98 – 13.30 Ωm) within the shallow subsurface of the dumpsite up to a depth of 10 m. A fractured zone was delineated within the subsurface. This zone of enhanced porosity and permeability spanning a distance of about 20 m offers the main conduit / seepage path for the leachate to percolate through the subsurface formation. Landfill leachates are potentially harmful to the environment and to human health. Proper mitigation measures are necessary to protect the shallow groundwater system, soil and the environment.
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