ESTIMATION OF METHANE EMISSIONS FROM WASTE DISPOSAL SITES IN LAGOS, NIGERIA

摘要

Increase in municipal solid waste (MSW) and its management continues to be a major challenge for growing cities as landfills are the most common method of MSW disposal world over. Landfills are known to be one of the anthropogenic sources of methane (CH4) and this gas isan important contributor to global warming. Many literature reports have been carried out to quantify methane from landfills, but little information is available about the quantity of methane emitted from waste disposal sites (WDS) in Lagos, Nigeria. In this study, the LandGEM model parameters k and Lo were modified and used to estimate methane emissions from WDS in Lagos, Nigeria. The results showed that the k and Lo values for the WDS were 0.237 yr-1 and 75.85 m3/tonne and the maximum CH4 generationat the WDS are 29,709,414m3, 6,574,684 m3, 3,634,598 m3 for Olushosun, Abule Egba and Solous 1WDS. The default parameters in the model was also used to estimate the CH4 generation and this resulted in an overestimation of CH4 with about42%, 37% and 40% in Olushosun, Abule Egba and Solous WDS during the period considered. It is recommended that LFG parameters should be developed for developing countries in order to avoid over/under estimation of methane generation from their waste disposal sites. Furthermore, modeling errorscould result in the design of oversized landfill gas (LFG) management systems.