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Characterization of Dumpsite Leachate: Case Study of ogbomosoland, South-Western Nigeria

Open Journal of Civil Engineering 2012年第1期2卷 33-41页

作者： Samson O. Ojoawo Oluwole A. Agbede Abimbola Y. Sangodoyin Department of Agricultural and Environmental Engineering University of Ibadan Ibadan Nigeria Department of Civil Engineering Ladoke Akintola University of Technology Ogbomoso Nigeria Department of Civil Engineering University of Ibadan Ibadan Nigeria

Leachates contain varying complex characteristics. The 5 Local Government Areas (LGAs) under this study that characterized leachate are no exceptions. Five aged dumpsites, one per LGA were selected and leachates extracted from them through BS 1377 standard method. Samples were taken seasonally over 2 years and subjected to Laboratory analyses for physical, inorganic, metallic and microbial characteristics. The key leachate contents mean, (pollution indices) included Nickel (0.2 mg/l), Manganese (1.8 mg/l), Dissolved Oxygen (11.5 mg/l) and Total Coliform (24.3 cfu/ml). Results obtained were compared with the Nigerian Federal Environmental Protection Agency (FEPA) standards. The leachate of the area is found to be stable, objectionably coloured, odoured, alkaline, turbid, hard, with moderate recalcitrant organic and biological matters. The study recommends leachate treatment to minimize groundwater pollution.

关键词： Leachate Dumpsites ogbomosoland Nigeria

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On the Physical Composition of Solid Wastes in Selected Dumpsites of ogbomosoland, South-Western Nigeria

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Journal of Water Resource and Protection 2011年第9期3卷 661-666页

作者： Samson Ojoawo Oluwole Agbede Abimbola Sangodoyin 不详

Solid wastes have varied compositions and constituents from place to place. The study area is not an excep- tion. The entire 5 Local Government Area (LGA)s of ogbomosoland were surveyed and about 40 major dumpsites were identified across the spread. Twenty-five (25) of these were selected, five (5) each per LGA, for the study. The wastes were collected from the dumps, sorted, weighed and classified according to their constituents. The densities of wastes from the 25 dumpsites were also determined. The overall average composition using the main classes of wastes were found to be food;68.4%, metals;7.2%, textile;4.6%, papers;4.4%, plastic;3.9%, glass;3.6%, wood;3.1%, and miscellaneous;4.8%. The average waste density for the study area was 438.1 kg/m3. Putrescible materials dominated the waste composition of the study area. The components of wastes in the city revealed a higher standard of living when compared with those of the residents in the environs. Rural residents generate denser wastes when compared with the urban centres and as such are prone to leachate pollution emanating from these organic wastes. The ingress of leachate is a threat to the groundwater resources of the study area.

关键词： Solid Wastes Leachate Pollution ogbomosoland

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System Dynamics Modeling of Dumpsite Leachate Control in ogbomosoland, Nigeria

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Journal of Environmental Protection 2012年第1期3卷 120-128页

作者： Samson O. Ojoawo Oluwole A. Agbede Abimbola Y. Sangodoyin 不详

Leachate pollution from landfills is a major source of environmental hazard in many Nigerian municipalities and there is the need to mitigate its effects. The aim of this study is to examine the leachate pollution and determine the effectiveness of liner system in leachate management of dumpsites in ogbomosoland. The method of modeling us ing principles of system dynamics was employed to determine the interrelationships of leachate generation components for 50 years. Causal loops indicating the linkage of population, economic status, waste generation per capita and weather conditions to wastes and leachate generation were developed. A set of state model equations for Gas Produced (Gp), Precipitation (Pt), Degradation water-loss (Wg), Leachate Quantity (LQn), were formulated. Leachate management strategies of liner systems were studied, and the effectiveness of Compacted Clay (CC), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Geosynthetic Clay (GC), Silt (SI), Sandy loam (SL), and Sand (SA) liners were examined. A user-friendly computer program for estimating leachate generation per time and breakthrough time for liners was then developed. The results showed that a direct relationship exists between leachate and Gp, Pt, Wg and LQn. Average leachate breakthrough times for the liners, in years, were CC (41.5), HDPE (14.0), LDPE (10.0), GC (1.1), SI (0.1), SL (0.01), and SA (0.00002). In conclusion, dumpsite leachate pollution was established as having negative effects on the groundwater resource. Compacted Clay liner is therefore recommended for use in curtailing its menace.

关键词： System Dynamics Dumpsite Leachate Pollution ogbomosoland

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