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INVESTIGATION OF HEAVY METAL CONTAMINATION IN GROUNDWATER AROUND LANDFILL SITE IN A TYPICAL SUB-URBAN SETTLEMENT IN ALIMOSHO, LAGOS-NIGERIA

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Author(s): AKOTEYON, I.S. | MBATA, U.A. | OLALUDE, G.A.

Journal: Journal of Applied Sciences in Environmental Sanitation
ISSN 0126-2807

Volume: 6;
Issue: 2;
Start page: 155;
Date: 2011;
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Keywords: Contamination | groundwater | heavy metal | landfill | Nigeria | sub-urban settlement

ABSTRACT
The generation of solid waste has become an increasing environmental and public health problem all over the world. Landfills have been identified as one of the major threats to groundwater resources due to its possibility of groundwater contamination. The study examined groundwater contamination around municipal landfill site in Alimosho Local Government Area of Lagos State, Nigeria. Groundwater samples were collected from 10 sampling locations around the landfill and were analyzed after standard procedure for 7 heavy metals including (Cadmium, Chromium, Copper, Iron, Manganese, Lead and Zinc).The result showed that the mean concentrations of all measured parameters except Cr and Mn conform to the maximum permissible limits of WHO standards for drinking water quality. Pb and Zn exceeded the mean concentrations of all measured parameters in about 90% based on the maximum permissible limits of WHO standards for drinking water quality in the study area.Fe and Cu was also found to be above the mean concentrations of all measured parameters in about 50% and 40% based on the maximum permissible limits of WHO standards for drinking water quality in the study area respectively. On the pattern of relative variation, the result shows that all the examined variables are heterogeneous. Iron for example tops the list with a value of 148.98%. The research recommends a thorough study of the groundwater flow direction in the area to enlighten the people of how to locate their well. We also suggest that there should be adequate maintenance and adherence to world standard of landfill operation in order to safeguard the health of the populace.
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