JETI

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Abstract

The study of the physical properties of the soil underlying the municipal solid waste (MSW) fill emplaced at Ilokun dumpsite in Ado Ekiti was undertaken. Samples of the soil at five different locations within the dumpsite were examined. Classification of the soil according to BS5930 indicated the soil to be clayey gravelly SAND (clay of intermediate plasticity). The liquid limit and plastic limit of the soil at the depth of 1.2m were generally higher than 40% and 20% respectively. The plasticity index was also higher than 20% at the same depth. The shrinkage limit at various locationsvaried between 2.3% and 13.6%, with majority higher than 7%. However, there was not a definite trend in the values of the liquid limit, plastic limit, plastic index and shrinkage limit of the soil with depth and location at the dumpsite. This is indicative of the heterogeneity of the soil owing to the impact of the overlying heterogeneous waste. Perhaps the most significant finding was the saturated hydraulic conductivity of the soil that was in the order of 10-3 cm/s, which is far greater than the minimum of 10-7cm/s recommended for soil liners in MSW landfill. To avoid further pollution of the soil and groundwater in the vicinity of the dumpsite, its immediate closure was recommended.

References

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