Wale Aboyade's thesis - lumes

Akinwale Aboyade, LUMES Thesis, 2003/2004
4.1.3.3 Methane emissions from Olusosun SWDS
Narrowing down to Olusosun SWDS where even more data is available, and where the emission model
used (the first order decay (FOD)model) is a better representation of the fate of CH 4 emissions in
landfills, the results are as shown in the charts below under the following assumptions.
L o – Methane generation potential (same as MCF*DOC*DOCF*16/12 in the default method)
and here assumed to be about 150m 3 /Mg. A conservative estimate when compared with
1(0m 3 /Mg for Brazil which has a similar waste composition ( Mailly, 2004).
K- methane generation constant for lack of data is assumed to be the default suggested by IPCC
- 0.05
80000
1
1
40000
1
0
1
1991.00 2000.75 2010.50 2020.25 2030.00
Years
Figure 4.6 Methane emissions from Olusosun SWDS
(Source: own construct)
The graph shows methane emission from Olusosun reaching its peak of about 76,000 tonnes of
methane in 2014 thereabouts with an average annual emission of 63,000 tonnes during the project’s
lifetime. It also shows that Olusosun will still be generating emissions well beyond 2030. A sensitivity
analysis varying k and L o by ±15% shows that this varies from a low of 47,000 tonnes to a high of
78,000 tonnes CH 4 .
4.1.3.4 Utilization potential
Although there are various uses of methane generated from landfills, this study will only consider
flaring and electricity generation. Allowing for a 25% uncertainty in the following figures and
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