Juwana, Iwan and Al-Madani, Hamasah Abdurrohman and Ainun, Siti and Permadi, Didin Agustian (2024) Impact of Methane Emission Reduction Measures in a Tropical Landfll to Methane Ambient Air Quality. EnvironmentAsia Journal, 17 (1). pp. 112-122. ISSN ISSN: 1906-1714; Online ISSN: 2586-8861

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Abstract

Anaerobic process occurred in landfills emits substantial amount of methane (CH4) to the atmosphere. Methane is a strong greenhouse gas (GHG) as well as an ozone precursor therefore reduction of the emission would provide co-benefts on reduced climate forcing and improved air quality. Emission inventory for the base year of 2019 where the activity data were available was done using both Intergovernmental Panel on Climate Change (IPCC) and Landfll Gas Emissions Model (LandGEM) models. Emission results were compared with the fux rate measurement using close fux chamber at the landfll but for limited period. Two selected measures were proposed: biocover (biosolid) and pipe-faring system and emission reductions were calculated. Dispersion analysis of base year methane emission was done using the Aermic Model (AERMOD) model with grids size of 0.5 x 0.5 km with a radius of 5 km from the landfll for maximum hourly, daily maximum, and annual average periods. The results of the model analysis showed that the locations exposed to the maximum concentration were within a radius of up to 1 km from the landfll to the eastern part of domain which is dominated by rice felds and residential area. High concentrations of methane over the residential areas potentially triggered the ozone formation as other local ozone precursors such as NOx and CO were potentially emitted. Meteorological factors, especially wind patterns, greatly afected the distribution pattern of CH4 in the study area. Simulations of two measures of bio-cover and pipe-faring system were also done to investigate the impact on the methane air quality. Emission reduction of the pipe-faring system yielded higher value as compared to the biocover therefore simulated methane also showed lower concentrations over the domain. In the near future, it is recommended that the pipe-faring system to be installed in the landfll. Keywords: Landfll; Methane; IPCC; LandGEM; AERMOD

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