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Geotechnical Characterization of some Clayey Soils for Use as Landfill Liner
OLUWAPELUMI, O. OJURI
Abstract
Waste management is one of the major challenges faced by municipality
officials, public health engineers and environmentalists in their quest to protect and preserve
our environment. Construction and operation of an engineered sanitary landfill ensures proper
waste management with the protection of human and ecosystem health. This paper presents
the results of geotechnical investigation carried out on clayey soils from three selected pottery
areas in Oke Ogun, Oyo State; to assess their suitability for use as landfill liner. Samples were
collected at three locations namely: Ajetunmobi village, sample A; Adegbite area, sample B;
and Arigangan area, sample C. Basic index characterization tests conducted on the samples
revealed percentage fines for samples A,B and C were 32.7%, 28.3% and 37.0% respectively.
Specific gravity ranged between and 2 · 71 and 2 · 74. Sample A had Cation Exchange Capacity
(CEC) value of 10.58 milli-equivalents/100g (Meq./100g), sample B had CEC value of 11.76
(Meq./100g) and sample C had CEC value of 12.18 (Meq./100g) Geotechnical tests
conducted on samples resulted in hydraulic conductivity (k) of 1.86 × 10-10m/sec for
sample A ; 4.12 × 10-8m/sec for sample B and, 2.60 × 10-10m/sec for sample C. The
results obtained from the study show that sample A is the best material for a landfill liner
based on the hydraulic conductivity criterion, however all the other samples are also useful
and can be improved by addition of little percentage of bentonite. The compaction and
compressibility characteristics needed in the specifications for the construction and operation
of an engineered landfill using these clayey soils are presented.
Keywords
Landfill Liner; Waste management; Cation Exchange Capacity; Hydraulic conductivity; Geotechnical characterization
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