Igwe O., Omonona O.V., Onwuka O.S., Nnebedum O.D.
Department of Geology, University of Nigeria, Nsukka, Nigeria; Department of Physics/Geology/Geophysics, Federal University, Ndufu Alike, Ikwo, Nigeria
Igwe, O., Department of Geology, University of Nigeria, Nsukka, Nigeria; Omonona, O.V., Department of Physics/Geology/Geophysics, Federal University, Ndufu Alike, Ikwo, Nigeria; Onwuka, O.S., Department of Geology, University of Nigeria, Nsukka, Nigeria; Nnebedum, O.D., Department of Geology, University of Nigeria, Nsukka, Nigeria
This study investigated the impacts of asbestos wastes on soils in Emene-Enugu, southeastern Nigeria, generated by the activities of a major asbestos products manufacturing company in southeastern Nigeria. The methods of investigation included vertical electrical sounding (VES), 2-D horizontal resistivity profiling (HRP), induced polarization (IP) survey, chemical analysis of plant tissues and standard penetration tests of soil samples. The 2-D HRP and IP identified six closed waste pits alongside the two active pits. The VES revealed four geoelectrical layers in the area: from bottom to top; the inferred lithologies included dark shale, clay, gravel and recent sands. The geochemical data results revealed that Cd concentration of the soils of the waste pits is above the contaminated land exposure assessment soil guideline value for residential and allotment land uses. The geochemical pollution indices classified the soils as “unpolluted” to “extremely polluted”. Bioconcentration factor of Pb in plant tissues was found to be above recommended limits of 0.045. The geotechnical parameters indices revealed that the soils varied from “very soft” to “stiff” and “very loose” to “medium”. Soils of the active pits have very low strength and bearing capacity while closed pits have high strength and bearing capacity. It may be safe, therefore, to conclude that as the wastes are completely turned into soils, they will assume geotechnical properties similar to those of natural soils. © 2014, Springer International Publishing Switzerland.
Asbestos; Bearing capacity; Cadmium; Chemical analysis; Electric prospecting; Geochemistry; Histology; Land use; Pollution; Soil testing; Soils; Tissue; Emene-Enugu; Enrichment factors; Geo-accumulation index; Standard penetration test; Waste dumps; Soil pollution; asbestos; soil; soil pollutant; analysis; chemistry; environmental monitoring; Nigeria; plant; pollution; soil; soil pollutant; statistics and numerical data; Asbestos; Environmental Monitoring; Environmental Pollution; Nigeria; Plants; Soil; Soil Pollutants