ASSESSMENT OF POTENTIAL LEACHATE-ASSOCIATED ZONES AROUND KABAMA MUNICIPAL SOLID-WASTE DUMPSITE, ZARIA, NIGERIA, USING ELECTRICAL RESISTIVITY TOMOGRAPHY AND INDUCED POLARIZATION TECHNIQUES

Abstract

To identify buried waste items and potential leachate accumulation in the subsurface of Kabama dumpsite in Zaria, Kaduna State, Nigeria, an interpretation of resistivity and chargeability imaging approach was utilized. A total of 6 profiles were mapped using a Dipole-Dipole configuration with ABEM TERRAMETER SAS 4000, with an electrode spacing of 5.0 m and profile distances of 200 m. The inversions revealed both the lateral and vertical extents of conductive zones, primarily in fractured regions that functioned as the contaminant pathways. The electrical resistivity and chargeability imaging was established using the inverse models produced by a 2D inversion program (RES2DINV). The leachate had low resistivity (˂10 Ωm) and a weak chargeability zone (˂20 msec), whereas the investigations verified a high chargeability unit (˃70 msec) showing waste deposits and a saturated clayey layer. The results obtained in this research highlight the potential application of resistivity and IP methods jointly to monitor the contaminant plume. These non-destructive, efficient, and economically viable geophysical techniques could lead to a robust reconnaissance framework for remediation of solid waste disposal sites.