Leachate originating from open refuse dumpsite systems can be delineated through an integration of qualitative and quantitative methods. This study was designed to examine extent of leachate and pollution from one of the numerous open refuse dumpsites in Lagos metropolis. Qualitative assessment was determined using electrical resistivity tomography (ERT), vertical electrical sounding (VES) and induced polarization geophysical methods. Both ERT and VES methods revealed persistent low resistivity (1 - 20 Ωm) of leachate to the depth above 35 m. The two methods were projected to produce 3-D view of the site which shows a NW-SE flow pattern of the leachate and possibly, the groundwater. IP values observed over the polluted zone was -2.9 - 8 ms, indicating a sandy layer. Quantitative assessment was achieved by analysis of geochemical substances in the water samples taken from wells and boreholes in the precinct of the dumpsite. Here, we examine the macroelements, salts (sulphates, nitrates and chlorides), heavy metals, radioactive metals contents and physical parameters of the water samples. The analyses reveal the presence of these substances in the water and their strong correlations justified the provenance as the same. As part of the quantitative evaluation, physical parameters (pH, TDS, DO, salinity, total hardness, turbidity, electrical conductivity EC and temperature) of the water samples were also determined. The samples pH plotted in the acidic domain unsuitable for human consumption. Leachate flow direction was generated from the decreasing concentration of measured parameters (geochemical elements and physicals properties) in NW-SE direction which agrees with similar flow pattern deduced from ERT results.
W. E. Kelly and M. Stanislav, “Applied Geophysics in Hyrogeological and Engineering Practice,” Elsevier, Amesterdam, 1993.
D. S. McFarlane, J. A. Cherry, R. W. Gilham and E. A. Sudicky, “Migration of Contaminants in Groundwater at a Landfill: A Case Study,” Journal of Hydrology, Vol. 63, No. 1-2, 1983, pp. 1-29. doi:10.1016/0022-1694(83)90221-4
D. Fatta, A. Papadopoulos and M. Loizidou, “A Study on the Landfill Leachate and Its Impact on the Groundwater Quality of the Greater Area,” Environmental Geochemistry and Health, Vol. 21, No. 2, 1999, pp. 175-190. doi:10.1023/A:1006613530137
S. Mor, K. Ravindra, P. R. Dahiya and A. Chandra, “Leachate Characterization and Assessment of Groundwater Pollution near Municipal Solid Waste Landfill Site,” Environmental Monitoring and Assessment, Vol. 118, No. 1-3, 2006, pp. 435-456. doi:10.1007/s10661-006-1505-7
E. Dimitriou, I. Karaouzas, K. Saratakos, I. Zacharias, K. Bogdanos and A. Diapoulis, “Groundwater Risk Assessment at a Heavily Industrialized Catchment and the Associated Impacts on a Peri-Urban Wetland,” Journal of Environmental Management, Vol. 88, No. 3, 2008, pp. 526-538. doi:10.1016/j.jenvman.2007.03.019
R. K. Singh, M. Datta and A. K. Nema, “Review of Groundwater Contamination Hazard Rating Systems for Old Landfills,” Waste Management & Research, Vol. 28, No. 2, 2009, pp. 97-108.
E. A. Ayolabi, A. F. Folorunso, L. Adeoti, S. Matthew and E. Atakpo, “2-D and 3-D Electrical Resistivity Tomography and Its Implications,” The 4th Annual Research Conference and Fair held at the University of Lagos, Akoka, 8 Jannuary 2009, p. 189.
E. A. Ayolabi, “Geoelectric Evaluation of Olushosun Landfill Site Southwest, Nigeria and Its Implications on Groundwater,” Journal of the Geological Society of India, Vol. 66, No. 3, 2005, pp. 318-322.
E. A. Ayolabi and J. Oyelayo, “Geophysical and Hydrochemical Assessment of Groundwater Pollution Due to a Dumpsite in Lagos, Nigeria,” Journal of the Geological Society of India, Vol. 66, No. 5, 2005, pp. 617-622.
E. A. Ayolabi and D. Y. Peters, “Hydrochemical and Electrical Resistivity Assessment of the Impact of Solid Waste on the Groundwater at Oke-Alfa Refuse Dumpsite,” Journal of Engineering and Technology Management, Vol. 12, No. 1, 2004, pp. 5936-5946.
J. Pastor and A. J. Hernández, “Heavy Metals, Salts and Organic Residues in Old Solid Urban Waste Landfills and Surface Waters in Their Discharge Areas: Determinants for Restoring Their Impact,” Journal of Environmental Management, Vol. 98, 2012, pp. S42-S49. doi:10.1016/j.jenvman.2011.06.048
P. C. Ogbonna and E. O. Ukiwe, “Metals (Hg, As, Fe, Cr) Uptake in Selected Woody Species in Umuahia, Nigeria,” Journal of Applied Sciences in Environmental Sanitation, Vol. 6, No. 1, 2011, pp. 23-28.
E. G. Akpokodje, “Principle of Applied and Environmental Geology,” Paragraphic Publisher, Port Harcourt, 1999.
A. A. Odewande, “Hydro-Chemical Characteristic of the Environmental Impact of Solid Waste; Dumpsite, Orita Aperin Central Refuge Dumpsite in Ibadan. South Western, Nigeria,” Ph.D. Thesis, University of Ibadan, Ibadan, 1999.
G. J. Udom and E. O. Esu, “A Preliminary Assessment of the Impact of Solid Wastes on Soil and Groundwater Sys-Tem in Part of Port Harcourt City and Its Environs. Rivers State Nigeria,” Global Journal of Environmental Sciences, Vol. 4, No. 1, 2005, pp. 23-30.
S. Anon, “Hydrogeological Implications in Solid Waste Disposal,” Bull. International Association Hydrogeol, 2009, pp. 146-158.
N. Okoronkwo, J. C. Igwe and E. C. Onwuchekwa, “Risk and Health Implications of Polluted Soils for Crop Production,” African Journal of Biotechnology, Vol. 4, No. 13, 2005, pp. 1521-1524.
C. Bairds, “Environmental Chemistry,” W.H. Free-man and Company, New York, 1995, pp. 384-387.
N. J. Bunce, “Environmental Chemistry,” Winers Publishing Ltd., Winnipeg, 1990.
W. D. Daily, W. Lin and T. Buscheck, “Hydrological Properties of Topopah Spring Tuff: Laboratory Measurements,” Journal of Geophysical Research, Vol. 92, No. B8, 1987, pp. 7854-7864. doi:10.1029/JB092iB08p07854
A. Ramirez, W. Daily, A. Binley, D. LaBrecque and D. Roelant, “Detection of Leaks in Underground Storage Tanks Using Electrical Resistance Methods” Journal of Environmental & Engineering Geophysics, Vol. 1, No. 3, 1996, pp. 189-203. doi:10.4133/JEEG1.3.189
D. J. LaBrecque, A. Ramirez, W. Daily and A. Binley, “ERT Monitoring of Environmental Remediation Processes,” Measurement Science and Technology, Vol. 7, No. 3, 1996, pp. 375-383. doi:10.1088/0957-0233/7/3/019
W. D. Daily, A. L. Ramirez and R. Johnson, “Electrical Impedance Tomography of a Perchloroethylene Release,” Journal of Environmental & Engineering Geophysics, Vol. 2, No. 3, 1998, pp. 189-201.
E. Auken, L. Pellerin, N. B. Christensen and K. Sorensen, “A Survey of Current Trends in Near-Surface Electrical and Electromagnetic Methods,” Geophysics, Vol. 71, No. 5, 2006, pp. G249-G260.
E. A. Al-Sayed and G. El-Qady, “Evaluation of Sea Water Intrusion Using the Electrical Resistivity and Transient Electromagnetic Survey: Case Study at Fan of Wadi Feiran, Sinai, Egypt,” EGM International Workshop Innovation in EM, Gravity and Magnetic Methods: A New Perspective for Exploration Capri, Capri, 15-18 April 2007.
L. Pellerin, “Applications of Electrical and Electromagnetic Methods for Environmental and Geotechnical Investigations,” Surveys in Geophysics, Vol. 23, No. 2-3, 2002, pp. 101-132. doi:10.1023/A:1015044200567
M. O. Olorunfemi, A. I. Idoringie and A. T. Coker, “Application of the Electrical Resistivity Method in Foundation Failure Investigation: A Case Study,” Global Journal of Geological Sciences, Vol. 2, No. 1, 2004, pp. 139-151.
M. Corriols and T. Dahlin, “Geophysical Characterization of the Leon-Chinandega Aquifer Nicaragua,” Hydrogeology Journal, Vol. 16, No. 2, 2008, pp. 349-361.
A. A. Nigm, R. A. Elterb, F. E. Nasr and H. M. Thobaity, “Contribution of Ground Magnetic and Resistivity Methods in Groundwater Assessment in Wadi Bany Omair. Holy Makkah Area, Saudi Arabia,” Egyptian. Geophysical Society Journal, Vol. 6, No. 1, 2008, pp. 67-79.
E. A. Ayolabi, E. A. Atakpo, L. Adeoti, E. C. Otobor and T. Arerin, “Groundwater Quality Assessment Using Predrilling Electrical Measurements,” Journal of Environmental Hydrology, Vol. 17, 2009, pp. 1-12.
E. A. Ayolabi, A. F. Folorunso and P. W. Obende, “Integrated Assessments of Possible Effects of Hydrocarbon and Salt Water Intrusion on the Groundwater of Iganmu Area of Lagos Metropolis, Southwestern Nigeria,” Earth Sciences Research Journal, Vol. 14, No. 1, 2010, pp. 100-110.
E. A. Ayolabi, A. F. Folorunso and M. O. Oloruntola, “Constraining Causes of Structural Failure Using Electrical Resistivity Tomography (ERT): A Case Study of Lagos, Southwestern, Nigeria,” Mineral Wealth, Vol. 156, No. 4, 2010, pp. 7-18.
L. Giovanni, “The Use of Geophysical Methods for 3-D Images of Total Root Volume of Soil in Urban Environments,” Exploration Geophysics, Vol. 41, No. 4, 2010, pp. 268-278. doi:10.1071/EG09034
N. Myers, “Population, Resources and the Environment: The Critical Challenges,” UNPF—United Nation Population Fund, New York, 1991.
O. Oresanya, “Integrated Waste Management in Lagos State—Shifting the Paradigm,” Annual Conference of NMGS, Minna, 6-11 March 2011, pp. 1-117.
H. A. Jones and R. D. Hockey, “The Geology of Part of Southwestern Nigeria,” Bulletin (Geological Survey of Nigeria), Vol. 31, 1964, p. 87.
C. A. Kogbe, “Geology of Nigeria,” 2nd Revised Edition, Elizabethan Publishing Company, Rock View Nigeria Ltd, Jos, 1989, p. 538.
M. E. Omatsola and O. S. Adegoke, “Tectonic and Cretaceous Stratigraphy of the Dahomey Basin,” Journal of Geology and Mining Research, Vol. 154, No. 1, 1981, pp. 65-68.
H. G. Billman, “Offshore Stratigraphy and Paleontology of Dahomey Embayment, West Africa. Nigerian,” Association of Petroleum Explorationist Bulletin, Vol. 7, No. 2, 1992, pp. 121-130.
M. E. Nton, “Sedimentological and Geochemical Studies of Rock units in the Eastern Dahomey Basin, South Western Nigeria,” Unpubl Ph.D. thesis, University of Ibadan, Ibadan, 2001.
NGSA, “The Geological Map of Nigeria,” A Publication of Nigeria Geological Survey Agency, Abuja, 2004.
E. O. Longe, S. Malomo and M. A. Olorunniwo, “Hydrogeology of Lagos Metropolis,” Journal of African Earth Sciences, Vol. 6, No. 2, 1987, pp. 163-174.
A. A. Adepelumi, B. D. Ako, T. R. Ajayi, O. Afolabi and E. J. Omotoso, “Delineation of Saltwater Intrusion into the Freshwater Aquifer of Lekki. Peninsula, Lagos, Nigeria,” Environmental Geology, Vol. 56, No. 5, 2008, pp. 927-933. doi:10.1007/s00254-008-1194-3
D. H. Griffiths, J. Turnbull and A. I. Olayinka, “Two-Dimensional Resistivity Mapping with a Computer-Controlled Array,” First Break, Vol. 8, No. 4, 1990, pp. 121-129.
M. H. Loke, “Tutorial: 2-D and 3-D Electrical Imaging Surveys,” 2004 Revised Edition. www.geometrics.com
A. Dey and H. F. Morrison, “Resistivity Modelling for Arbitrary Shaped Two-Dimensional Structures,” Geophysical Prospecting, Vol. 27, No. 1, 1979, pp. 1020-1036. doi:10.1111/j.1365-2478.1979.tb00961.x
C. Degroot-Hedlin and C. Constable, “Occam’s Inversion to Generate Smooth Two-Dimensional Models from Magnetotelluric Data,” Geophysics, Vol. 55, No. 12, 1990, pp. 1613-1624.
M. H. Loke, “The Inversion of Two-Dimensional Resistivity Data,” Ph.D. thesis, University of Birmingham, Birmingham, 1994.
M. H. Loke and R. D. Barker, “Rapid Least-Squares Inversion of Apparent Resistivity Pseudosections Using a Quasi-Newton Method,” Geophysical Prospecting, Vol. 44, No. 1, 1996, pp. 131-152. doi:10.1111/j.1365-2478.1996.tb00142.x
T. Dahlin and M. H. Loke, “Resolution of 2D Wenner Resistivity Imaging as Assessed by Numerical Modelling,” Journal of Applied Geophysics, Vol. 38, No. 4, 1998, pp. 237-249. doi:10.1016/S0926-9851(97)00030-X
M. H. Loke, I. Acworth and T. Dahlin, “A Comparison of Smooth and Blocky Inversion Methods in 2D Electrical Imaging Surveys,” Exploration Geophysics, Vol. 34, No. 3, 2003, pp. 182-187. doi:10.1071/EG03182
S. Murali and N. S. Patangay, “Principles and Application of Groundwater Geophysics,” 3rd Edition, Association of Exploration Geophysicists, Hyderabad, 2006.
V. O. Olanrewaju, M. O. Olorunfemi and O. Alade, “Chemical Characteristic of Groundwater from Some Parts of the Basement Complex of Central Nigeria,” Journal of Mining and Geology, Vol. 33, No. 2, 1996, pp. 135-139.
K. M. Ibe Sr and A. H. O. Sowa, “Hydrogeology of Part of the Oramiriukwa River Basin, Southeast of Owerri, Imo State, Nigeria,” Hydrogeology Journal, Vol. 10, No. 4, 2002, pp. 509-521. doi:10.1007/s10040-002-0207-7
A. E. Ofoma, D. A. Omologbe and P. Aigberua, “Physico-Chemical Quality of Groundwater in Parts of Port-Harcourt City, Eastern Niger Delta Nigeria,” Water Resources, Vol. 16, 2005, pp. 18-24.
P. R. Ikhane A. F. Folorunso, O. L. Shonibare, A. M. Odukoya and C. O. Shomoye, “Hydrogeochemical Study, Health Implications and Interpretation of Surface Water Analysis around Rural Settlements of Itasin and Oki-Gbode, Southwestern, Nigeria,” Research Journal of Applied Sciences, Vol. 6, No. 12, 2010, pp. 2042-2050.
W. H. O., “Guidelines for Drinking Water Quality,” 4th Edition, A Publication of World Health Organization, Switzerland, 2011.
M. Ahel, N. Mikac, B. Cosovic, E. Prohic and V. Soukup, “The Impact of Contamination from a Municipal Solid Waste Landfill (Zagreb, Croatia) on Underlying Soil,” Water Science and Technology, Vol. 37, No. 8, 1998, pp. 203-210. doi:10.1016/S0273-1223(98)00260-1
SON-Standard Organization of Nigeria, “Standard for Drinking Water Quality,” Nigerian Industrial Standard, Abuja, 2007