Understanding Leaching Behaviour of Landfill Leachate in Benin-City, Edo State, Nigeria through Dumpsite Monitoring.
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Date
2011-10
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Abstract
Indiscriminate disposal of solid waste in unauthorized places has become an increasing
problem for most cities in Nigeria, especially Benin-City, Edo state. Benin-City one of the
largest city in Nigerian is experiencing the problem of solid waste management despite the
best attempt of waste avoidance, reduction, reuse and recovery. Use of dumpsites is still
the ultimate disposal method of domestic and industrial wastes in Benin-City. Three
dumpsites in Benin-City and environs were selected randomly to evaluate their leachates
characteristics. Leachate samples were collected from the dumpsites at three months
interval and were assessed for their quality through physico-chemical and elemental
examination using standard methods for examination of water and wastewater. Physicochemical
analysis result showed pH range of 6.76±0.08 –7.49±0.02, EC (55212.0±2028.43
– 64344.33±1131.22 μS/cm), Temperature (26.03±0.25 – 26.60±0.35OC), Cyanide
(0.08±0.04 – 0.46±0.01 mg/L), Sulphide (12.30±1.21 – 14.90±2.26 mg/L), BOD5
(61.23±1.39 – 98.60±3.41mg/L), COD (92.11±2.14 – 140.00±4.19 mg/L), NO3-N 0.41±0.03
– 0.75±0.09 mg/L), NO2-N (0.09±0.01– 0.30±0.03mg/L), TOC (506.67±230.94 –
573.33±370.05 mg/L). Metals with consequential environmental significance determined in
the leachate samples recorded concentration in mg/L as: Cd(0.02±0.01 – 0.240.31),
Cr(0.04±0.00 – 0.06±0.01), Cu(0.49±0.07 - 0.61±0.05), Hg(0.03±0.01 – 0.06±0.01),
Mn(0.27±0.07 - 0.38±0.03), Ni(0.05 ± 0.01- 0.07 ± 0.01), Pb(0.05±0.01 – 0.12±0.010) and
Zn(0.37±0.04 - 0.65±0.03). The physiologic and metabolic roles of the elements detected in
the leachate are discussed. The concentrations of the elements detected were below the toxicity limits recommended by Federal Environmental Protection Agency (FEPA) limits. On
the overall, the physico-chemical and elemental characteristics of leachates obtained in
this study revealed that the three waste dumpsites generated leachates that were not as
contaminated as those reported in some other parts of the world.
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Keywords
Dumpsite, leachate, physico-chemical characteristic, metals, Benin-City
Citation
Aiyesanmi A F, Imoisi O B. Understanding Leaching Behaviour of Landfill Leachate in Benin-City, Edo State, Nigeria through Dumpsite Monitoring. British Journal of Environment and Climate Change. 2011 Oct-Dec; 1(4): 190-200.