3 research outputs found
Assessment of groundwater contamination around active dumpsite in Ibadan southwestern Nigeria using integrated electrical resistivity and hydrochemical methods
Investigation of groundwater contamination
due to leachate migration in a solid waste disposal site was
done using both geophysical and hydrochemical methods.
The main goals were to delineate groundwater contamination
due to leachate percolation and thus assessment of
quality of groundwater from nearby hand-dug wells bordering
the dumpsite for drinking purpose. A total of ten
resistivity traverses were acquired within and outside the
dumpsite using Wenner configuration with constant electrode
separation ranging from 5 to 25 m. The 2D resistivity
data were processed and inverted using RES2DINV and
RES3DINV softwares, respectively. Geochemical assessment
of groundwater samples were carried out according to
APHA standards while hydrochemical facies of the sampled
groundwater was evaluated using Piper Trilinear
software. The inverse resistivity models of the subsurface
from 2D and 3D imaging revealed low resistivity value less
than 10 X m suspected to be leachate while 3D inverse
sections allowed delineation of leachate, weathered layer,
bedrock and seepage path from the dumpsite. The extent of migration was more pronounced in the southern part of the
dumpsite, hence possible contamination of shallow
groundwater system as dumpsite ages. The results of
physico-chemical analyses showed the groundwater samples
to be within the limits of WHO/NSDWQ for drinking
purpose. However, higher values of concentrations of most
analyzed parameters were noticed in well 1 due to its
nearness to dumpsite and well 10 due to agricultural
activities, respectively. Interpretation of Piper diagram
showed CaHCO3 to be dominant facie in the area while
alkaline earth metals (Ca2þ; Mg2þ) and weak acids
(HCO3
-, CO3-) are dominant cations and anions during
both climatic seasons. Groundwater in the study area is of
hard, fresh and alkaline in natur
Groundwater Assessment of Hand Dug Wells around Open Landfill in Ibadan Metropolis for Domestic and Irrigation Purposes
Geochemical assessment of groundwater samples from hand-dug wells within the vicinity of Aba-Eku dumpsite was carried out for domestic and irrigation purposes. Ten groundwater samples were collected both in dry season and wet season for analysis of physico-chemical parameters: pH