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The influence of air inflow on CH4 composition ratio in landfill gas

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Abstract

When landfill gas is collected, air inflow into the landfill can reduce CH4 productivity. The decline of CH4 content in landfill gas (LFG) negatively affects energy projects. We studied air inflow rates and LFG characteristics from 699 vertical collection facilities (VCFs) in the 2nd landfill at the Sudokwon Landfill in South Korea. We first determined whether or not N2 was an effective indicator of air inflow at this site using argon assays. The results of this analysis showed that the denitrification processes could be disregarded and that N2 was an effective indicator of air inflow. Using the composition of N2 in LFG samples, we found that air inflow occurred at 73.6 % of the VCFs, and 25.6 % of samples from these facilities showed more than 80 vol% of air inflow. In addition, we observed that the O2 consumption rate was more than 70 % of the volume in all samples. \( R_{{{\text{CH}}_{ 4} }} \), which is the ratio of CH4 to the sum of CH4 and CO2, decreased with increasing air inflow. Finally, we found that, as air inflow increased, the variation in \( R_{{{\text{CH}}_{ 4} }} \) values for samples with equal air inflow ratios also increased due to differences in air inflow routes.

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  1. Sudokwon Landfill Site Management Corp, 58 Baekseok-dong, Seo Ku, Incheon, 404-706, Korea

    Seung-Kyu Chun

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  1. Seung-Kyu Chun
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Correspondence to Seung-Kyu Chun.

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Chun, SK. The influence of air inflow on CH4 composition ratio in landfill gas. J Mater Cycles Waste Manag 16, 172–177 (2014). https://doi.org/10.1007/s10163-013-0163-4

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