Seasonal Variation of Landfill Methane Emissions from ... - JGSEE

The 2 nd Joint International Conference on “Sustainable Energy and Environment (SEE 2006)”
D-026 (O) 21-23 November 2006, Bangkok, Thailand
3.2 Methane generation rate
The study site’s information including L o , disposal area and waste disposal history were used to evaluate the value of k by fit with
experimental data in the Mexico LFG Model. The obtained values of k are summarized in Table 3. It is clear that the values of k are
higher in wet season than dry season by about 7.5 – 9.6 times for landfills but varied between 2.1 – 11.5 times for open dump sites.
Table 3 The obtained value of methane generation rate (k)
Site Landfilling Condition k-wet season (yr -1 ) k-dry season (yr -1 )
Pattaya Managed - Deep 0.192 0.020
Cha-Am Managed - Shallow 0.040 0.005
Nakornprathom Unmanaged - Deep 0.005 0.002
Hua-Hin Managed - Deep 0.138 0.016
Nontaburi Unmanaged - Deep 0.0003 0.0001
Rayong Unmanaged - Shallow 0.013 0.004
Samutprakan Unmanaged - Deep 0.013 0.001
4. CONCLUSION
Measurements for methane emission were performed at seven solid waste disposal sites, located in central Thailand including 3
sanitary landfills, and 4 open dumps. 88.4% of sampling runs fulfilled the R 2 >0.5 criterion for dC/dt (75% had values of R 2 > 0.9).
The spatial variability of the local emissions in wet season is quite high (ranging between 0 – 825.79 g/m 2 /d) but the average spatial
emissions ranged between 5.45 – 129.79 g/m 2 /d. The spatial variability of the local emissions in dry season is lower than emissions in
wet season (ranging between 0 – 686.93 g/m 2 /d) but the average spatial emissions ranged between 1.00 – 23.40 g/m 2 /d. The obtained
values of k that used for methane emissions calculation ranged from 0.04000 – 0.19200 and 0.00530 – 0.02000 in landfills for wet
season and dry season, respectively. The obtained values of k for open dump sites ranged from 0.00030 – 0.01340 and 0.00012 –
0.00420 for wet season and dry season, respectively. The emissions in wet season are much higher than dry season. The moisture
content in waste disposal body might be the main cause for these phenomena.
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