GEOPHYSICAL ASSESSMENT OF LEACHATE PLUME AROUND SELECTED DUMPSITES IN BENIN CITY, EDO STATE, NIGERIA
Authors: *Achadu M.A, Obahiagbon K.O, Uyigue L
This paper is focused on the geophysical assessment of leachate plume around selected dumpsites in Benin municipality. The basis of this investigation was centered on the envisaged impact of solid waste dumping on its recipient soils which could be evident from its delineated leachate plumes. Actual measurements were carried out by transmitting electric current into geological layers of located soils in and around the dumpsites. The measurements obtained were transmitted into several two dimensions (2-D) imagery of electrical resistivity tomogram with the aid of proprietary software (RES2DINV). The analysis of these tomograms revealed evidence of pollutants leached into the soil geological strata for all the dumpsites studied. They were characterized by different colored portions from which bluish colored zones implied regions of low resistivity and leachate plume indicating groundwater contamination. Other suspected contaminants in the tomograms were landfill gases and chemical waste. The chemical constituents of these identified polluted regions could not be ascertained from the electrical resistivity tomograms. Further geochemical investigations of the dumpsites will be required in this regards.
Affiliations: Department of Chemical Engineering, Faculty of Engineering, University of Port Harcourt, Port Harcourt, Nigeria
Keywords: Leachate Plume, Electrical Resistivity, Tomogram, Dumpsite, Soil Geology
Published date: 2017/06/30