Geophysical mapping of contaminant leachate around a reclaimed open dumpsite.
No Thumbnail Available
Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Very low frequency electromagnetic (VLF-EM), 2D Electrical Resistivity Profiling (2D
ERP) and Vertical Electrical Sounding (VES) methods of geophysics were deployed to map the
extent of leachate contamination in near-surface rocks around a popular reclaimed dumpsite in
north central Nigeria. Two years after abandon and waste excavation; the dumpsite was converted
to a residential area with over 80 houses under construction. Prior to waste dumping operation,
clay-seal was installed at 2 m depth around the dumpsite to prevent leachate from the waste material
flowing to the adjoining area. Results from VLF, 2D ERP, and VES show presence of leachate
contamination in rocks and soil of the reclaimed dumpsite. Leachate has spread laterally up to a
distance of about 1 km on the northern and southern parts of the dumpsite centre, and up to a
depth of about 20 m. Compared to the results of similar survey in an area outside the dumpsite,
leachate infiltration raised the conductivity signature of the rocks around the dumpsite by about
200%: from 7% to 22%. Both VLF-EM and 2D ERP show the presence of approximate north –
south oriented structures/fracture characterised by high conductivity. VES results show the presence
of four – five geo-electric layers. Important conclusions from the study are that (i) leachate
is still present in the rocks and soil of the reclaimed dumpsite two years after the abandonment
and excavation of the waste materials, and (ii) the clay seal installed around the dumpsite could
not prevent leachate migration to the adjoining areas.
Description
find the full paper here
table of content: https://www.sciencedirect.com/journal/journal-of-king-saud-university-science/vol/29/issue/3
Full paper: http://www.sciencedirect.com/science/article/pii/S1018364716302701
Keywords
Contaminant leachate, Very low frequency electromagnetic, Georesistivity structure, Vertical electrical sounding, 2D electrical resistivity profilling, open dumpsite
Citation
Raji, W. O, T.O. Adeoye (2017): Geophysical mapping of contaminant leachate around a reclaimed open dumpsite. Journal of King Saud University - Science. (Q1) Vol 29(3), 348-359,