Journal of Environmental Science and Water Resources                                            ISSN 2277 0704

Vol. 4(3), pp. 092 - 103, April 2015                                                                 2015 Wudpecker Journals

 

Application of IWM-1 modeling technique in solid wastes inventory analysis and impact assessment of Lagos state, Nigeria

 

*Ojoawo S.O.  and Babatunde O.Y.

 

Department of Civil Engineering, Ladoke Akintola University of Technology, P.M.B 4.000 Ogbomoso, Nigeria.

 

*Corresponding author E-mail: soojoawo@lautech.edu.ng.

 

Accepted 25 April 2015

 

Abstract

 

In urban centres, pollution effects of solid wastes range from objectionable odour and groundwater contamination, to emission of toxic gases. This paper investigates the impact of solid wastes generated from four selected local government areas viz: Mushin, Agege, Ifako-Ijaye and Ikeja of Lagos State, Nigeria. Fifteen households in each of the areas were selected and daily samples of solid wastes were collected from each household over a period of 2 weeks. Wastes compositions were determined and four model scenarios viz: landfilling (the existing practice), material recovery, composting and incineration formed.  Integrated Waste Management-1 (IWM-1) tool was applied for inventory analysis and determination of wastes pollution impacts on air and water. Measured impact categories include: global warming potential, acidification potential, eutrophication, and photochemical ozone depletion. CO2, CH4, NOX, SOX, volatile organic compounds, particulate matters, Pb, Cd and organic matters were the examined impact parameters. Mean percentage wastes composition are: organic matter 74.8, paper 6.1, nylon 1.6, plastic 3.4, textile 2.9, glass 3.7, metal 5.3, silt 1.4 and ash 0.8. Landfilling Scenario has highest carbon equivalent of 2618 while incineration has lowest of 167 tonnnes, with CH4 impact being the most threatening on climate change. The respective greenhouse gases emitted are: (94.8 and 5.1% of CO2 and CH4); Smog precursors (0.02 and 0.007% of particulate matters and volatile organic compounds); heavy metal (0.43 and 1.3kg of Pb and Cd); and organic matters (16729kg of BOD). The existing total landfilling system is ineffective in curtailing the negative impacts of the wastes on air and water. It is recommended to be preceded by waste recycling and controlled incineration.

 

Key words: Integrated Waste Management-1, inventory analysis, landfilling, impact assessment.

 

 

 

  Cite this Reference:
 

Ojoawo SO, Babatunde OY (2015). Application of IWM-1 modeling technique in solid wastes inventory analysis and impact assessment of Lagos state, Nigeria.  J. Environ. Sci. Water Resourc. 4(3): 092-103.