Hydrological Implication of Solid Waste Disposal on Groundwater Quality in Urbanized Area of Lagos State, Nigeria
Afolayan, O.S; Ogundele F.O; Odewumi, S.G

Abstract
Waste is discarded materials of no further use to the owners and the pattern of its generation is a function of the level of urbanization, industrialization and economic status of society. The most convenient strategy of solid waste disposal is landfill which are usually sited in abandoned excavated sites. The quality of the groundwater which is the major source of potable water are affected by the waste disposal sites. The objective of this work is to examine the impact of solid waste disposal sites on the ground water quality of the residential areas boundary the sites. For empirical and experimental examination of the concentration of contaminant in the groundwater of the studied area, fifteen(15) wells were sampled for laboratory analysis. The results were analyzed with standard statistical package and compared with WHO,2004 and NSDWQ,2007 standard limit. The statistic correlation analysis indicated the that pH of the water has close relationship with many heavy metals and physicochemical parameters. Temporal variation between closed and operational landfills were compared. Therefore, concentration of some parameters like TSS, 0C, pH, and Nl are more concentrated around closed landfill than operational and parameters like Cl, Cd, Fe, and Pb are higher around the operational landfills than old one even above the standard limit around existing landfill. Concentration of pH is averagely neutral around Solous and 2 while alkaline around Solous 3.Closed landfill has the capability of generating certain pollutants than existing landfill, conversely some pollutants can also be highly generated in operational landfill than the former. In conclusion, groundwater contamination is the function of types of waste, season, topography, soil, underlying geology, surface water ingression and direction of groundwater flow.

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