PHYSIOCHEMICAL ASSESSMENT OF LANDFILL GENERATED LEACHATES IN LAGOS, NIGERIA

Christopher N Akujieze, Imoukhuede Moses IDEHAI


DOI: https://doi.org/10.12777/ijse.7.2.113-123

Abstract


About 3.5 million tonnes of comingled municipal solid wastes (MSW) are dumped annually into the landfill areas of Lagos in Nigeria with a human population of about 21 million. Upon geo-bio-chemical processes, leachates are produced which are improperly collected and may be introduced to the environment with possible insidious effects on human health. Eight (8) composite leachates samples were collected from four (4) landfills in the megacity and tested for their physiochemical parameters in order to determine their suitability for discharge into agricultural soils and groundwater systems. Geological  site investigation reveal that the landfills except Epe have significant attenuative clayey soil protection above groundwater, and can adsorb and/ or precipitate contaminants/ pollutants within its mass. Using ANOVA, juxtapositions of the Fcalculated with the  Fcritical values revealed a metal sequence of : Hg  > Zn >As >Mn >Ni >K >Pb >Cr>Cd>Fe. Also, total alkalinity> total hardness> total acidity. All the measured  anions had Fcalculated above Fcritical values and were in  the hierarchy : Chloride> sulphate> phosphate>nitrate.. Mean concentrations were in the order  : Fe>Cd>Cr>Pb>K>Ni=Mn>As>Zn>Hg. Fe also posted the highest value for standard deviation. Results of the ratios of the standard deviation to the means were in the sequence: Fe> Zn>K> Ni > Mn>Pb> Cr> Cd> Hg> As. The presence of arsenic above prescribed limits in the Epe leachate is a  major concern because the lithology is sandy, and has a reported depth of about 3m to the unconfined aquifer that adjoins the Epe Lagoon. This  expansive landfill is recommended for closure.


Keywords


ANOVA; attenuative capacity; composite leachates; unconfined aquifer.

Full Text:

FULL TEXT PDF

References


Adewole A.T. (2009). Waste Management towards Sustainable Development in Nigeria: A Case Study of Lagos State. Int. NGO J. 4(4): pp 173-179.

Akujieze, C. N., and Idehai, I. M. (2014). Standardization of The Electricity and Economics Potentials of Landfill Gas (LFG) in Lagos, Nigeria. Internat. J. Sci. Eng, 7(1):1-9; Doi: 10.12777/ijse.7.1.1-9.

American Public Health Association (APHA) (1995). Standard methods for the examination of water and wastewater. American Public Health Association, American Water Works Association, and Water Pollution Control Federation. 19th edition, Washington, D.C.

Aucott M. (2006): The fate of heavy metals in landfills: A Review by Prepared for the “Industrial Ecology, Pollution Prevention and the NY-NJ Harbor” Project of the New York Academy of Sciences

Bagchi A. (1994). Design, Construction, and Monitoring of Sanitary Landfill, Second Edition. John Wiley & Sons, New York.)

Bauer, M. and C. Blodau (2005). Mobilization of Arsenic by Dissolved Organic Matter from Iron Oxides, Soils and Sediments. Science of the Total Environment 354(2-3): pp 179-190.

Federal Environmental Protection Agency (FEPA) (1991). Water Quality, Federal Water Standards, Guidelines and Standard for Environmental Pollution Control in Nigeria, National Environmental Standards – Part 2 and 3, Government Press, Lagos p. 238.

Idehai, I. M. (2013). Municipal Solid Waste Disposal in Lagos: Effects on the Environment, and Partial Estimation of the Landfill Gas and Recyclable Potentials. M.Sc thesis, University of Benin.

Jones H.A. and Hockey R. D. (1964). The Geology of Part of S. W. Nigeria, Geol. Surv. Nigeria, Bull 31, p 87.

Junqueira F.F. and Palmeira E.M. (2000) . Interaction between Leachate and Foundation Soil in a Dump in Brasília. In: Proceedings of GeoEng 2000 – An International Conference on Geotechnical and Geological Engineering, Melbourne, Australia, Lancaster: Technomic Publishing Company, vol. 1., p6.

LASEPA (2010): Hazardous Waste Regulation, Treatment and Disposal in Lagos State. LASEPA. P 49

LAWMA (2010a): Progress and Challenges of Waste Management in Lagos, Nigeria. Paper presented at the Faculty of Science Obafemi Awolowo University Ile – Ife. ( www.lawma.gov.ng). LAWMA. P 91

Lee, G.F. and Lee, J.A. (2005). Municipal Solid Waste Landfills – Water Quality Issues, Water Encyclopaedia: Water Quality and Resource Development, John Wiley. NJ pp. 163-169.

Longe E.O., Malomo S., and Olorunnwo M.A. (1987). Hydrogeology of Lagos

Metropolis. J. Afr. Earth Sci., 6(2): pp 163-174.

Longe, E.O. and L.O. Enekwechi. 2007. Investigation on potential groundwater impacts and influence of local hydrogeology on natural attenuation of leachate at a municipal landfill Int. J. Environ. Sci. Tech., 4 (1): pp133-140.

Longe, E.O., and Balogun M.R. (2010). Groundwater Quality Assessment near a Municipal Landfill, Lagos, Nigeria Research Journal of Applied Sciences,Engineering and Technology 2(1): pp 39-44,

Ogwueleka, T.C. (2009). Municipal solid waste characteristics and management in Nigeria, Iran J.Environ. Health Sci. Eng., 6, pp 173-180.

Prudent P., Domeizela M., C. Massiani C., (1996) Chemical sequential extraction as decision-making tool:application to municipal solid waste and its individualconstituents. The Scienceo f the Total Environmen1t 78. Pp 55-61

Slomczynska B. and Slomczynski T. (2004).Physicochemical and Toxicological Characteristics of Leachate from MSW Landfills. PolishJ.Environ.Stud.,13(6):637

Sposito, G. (1989). The chemistry of soils. Oxford University Press. New York. pp277

Tattam, C.M., (1943). A review of Nigerian stratigraphy. Geological Survey of Nigeria Report, Lagos pp. 27-46


Refbacks

  • There are currently no refbacks.


Published by Department of Chemical Engineering University of Diponegoro Semarang
Google Scholar

IJSE  by http://ejournal.undip.ac.id/index.php/ijse is licensed under Creative Commons Attribution 3.0 License.