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3326929 
Journal Article 
Methane emission estimation from landfills in Delhi: A comparative assessment of different methodologies 
Chakraborty, M; Sharma, C; Pandey, J; Singh, N; Gupta, PK 
2011 
1 
Atmospheric Environment
ISSN: 1352-2310
EISSN: 1873-2844 
45 
39 
7135-7142 
WOS:000298120400015 
Landfills are important anthropogenic sources of methane (CH(4)) emission especially in fast urbanizing countries. This paper presents the CH(4) emission estimations carried out using the in-situ CH(4) measurements, IPCC 1996 Default methodology (DM), Modified Triangular Method (MTM) and First Order Decay (FOD) method for the three landfills currently operational in the capital city Delhi of India. The in-situ methodology has yielded the landfills specific methane emission factors (EFs). The annual average methane emission rates from three landfills namely, Ghazipur (GL), Bhalswa (BL) and Okhla (OL) are 14.6, 23.6 & 7.5 Gg y(-1) by DM; 13.3, 10.6 & 7.2 Gg y(-1) by the FOD; 17.0, 13.7 and 10.7 Gg y(-1) by the MTM; and 4.6, 4.2 and 1.4 Gg y(-1) by the in-situ measurement method respectively. The CH(4) EFs have been found to be 9.7 +/- 2.6, 5.5 +/- 1.6 and 5.5 +/- 1.7 g kg(-1) of waste respectively for the GL, BL and OL landfills in Delhi. The study reveals that in-situ methodology seems to provide better representative emission estimation compared to other methods. The FOD method also yields comparable results with that of in-situ methodology in cases where good waste composition data is available. (C) 2011 Elsevier Ltd. All rights reserved. 
Greenhouse gases; Municipal solid waste; Waste management; Emission factors; Inventories