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Groundwater quality assessment near a municipal landfill, Lagos, Nigeria.

2010; Maxwell Scientific Publications; Volume: 2; Issue: 1 Linguagem: Inglês

2040-7467

E. O. Longe, Mobolanle Balogun,

Electrokinetic Soil Remediation Techniques

The current research examined the level of groundwater contamination near a municipal landfill site in Alimosho Local Government Area of Lagos State, Nigeria. Water quality parameters (physico-chemical and heavy metals) of leachate and groundwater samples were analyzed. The mean concentrations of all measured parameters except NO3G, PO4 + and CrG conform to the stipulated World Health Organization potable water standards and the Nigerian Standard for Drinking Water Quality. Mean concentration values for TDS, DO, NH4 , SO4 , PO4 , NO3G and ClG are 9.17 mg LG , 3.19 mg LG, 0.22 mg LG, 1.60 mg LG, 10.73 mg LG, 38.5 mg LG and 7.80 mg LG respectively. The mean concentration values for Fe, Mn, Zn and Cr in groundwater samples are 0.07mg LG, 0.08mg LG, 0.08mg LG and 0.44mg LG respectively. The current results show insignificant impact of the landfill operations on the groundwater resource. The existing soil stratigraphy at the landfill site consisting of clay and silty clay is deduced to have significantly influenced natural attenuation of leachate into the groundwater resource. It is however observed that in the absence of a properly designed leachate collection system, uncontrolled accumulation of leachates at the base of the landfill pose potential contamination risk to groundwater resource in the very near future. The research recommends an upgrade of the solous landfill to a standard that would guarantee adequate protection of both the surface and the groundwater resources in the locality.