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- Title
Geophysical imaging of municipal solid waste contaminant pathways.
- Authors
Abdullahi, N. K.; Osazuwa, I. B.
- Abstract
Surface electrical and electromagnetic surveys were conducted on top of a solid waste facility in Unguwan Dosa, Kaduna State, Northwest Nigeria. The aim of the geophysical survey was to detect vertical and subvertical fractures that may provide pathways for groundwater and contaminant transport. Results from the 2D electrical resistivity imaging showed vertical and subvertical contacts overlain by 6-10 m thick overburden. Quantitative interpretation of the VLF-EM data correlates well with the results of the 2D resistivity imaging delineating the vertical and subvertical contacts as good and weak conductors (fractures zones) with resistivity values of 40-220 and 300-420 Ω m, respectively. Azimuthal Schlumberger VES measurements yield apparent anisotropy values ranging from 1.01 to 1.47 for electrode spacings of 1-45 m with the highest value recorded at spacing of 2 m. However, azimuthal variations at large spacings (30-45 m) showed no fracture anisotropy due possibly to the array's low sensitivity to anisotropy at these spacings. The result of the study showed that pollutants in the leachate can reach and contaminate the groundwater. Therefore, urgency for leachate treatment at this site is recommended to prevent contamination of groundwater.
- Subjects
KADUNA (Nigeria); NIGERIA; GEOPHYSICS; WASTE salvage; POLLUTANTS; ANISOTROPY
- Publication
Environmental Earth Sciences, 2011, Vol 62, Issue 6, p1173
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-010-0606-3