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

Chun, Seung-Kyu

doi:10.1007/s10163-013-0163-4

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…Temporal variations in concentrations of major components of landfill gas, CH 4 , CO 2 , O 2 + Ar, and N 2 , are shown in Figure 3. In the figure, the ratio of CH 4 to the sum of CH 4 and CO 2 , R CH4 , which is used to evaluate the degree of stabilization of buried waste (Chun, 2014), is also shown. At PBH1 and PBH2 of the new section, high concentrations of CH 4 (approximately 60%) and CO 2 (20-30%) can be observed in parallel with low concentrations of O 2 + Ar and N 2 , probably due to active biodegradation of buried waste during the first 10 months after March 2013.…”

Section: Resultsmentioning

confidence: 99%

“…In order to assess the origin of a target gas, inert gases such as argon (Ar), helium (He), and their isotopes have been utilized in various fields, including geochemistry and waste management research (Kiyosu et al, 1986;Minissale et al, 1999;Kobashi et al, 2008;Chun, 2014). This is because these inert gases will not interfere with and/or participate in biochemical reactions in either soil strata or waste landfills.…”

Section: Introductionmentioning

confidence: 99%

“…When using Ar (which is the third largest component of atmospheric gas) as an inert gas, the method is called an argon assay. For example, Chun (2014) conducted argon assays of landfill gas samples and examined whether N 2 gases in the landfill originated from the denitrification process inside the waste or air intrusion from the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka

Nagamori

Mowjood

Watanabe

et al. 2016

Journal of the Air & Waste Management Association

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka

Nagamori

Mowjood

Watanabe

et al. 2016

Journal of the Air & Waste Management Association

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“…There have been many researches on gallery ventilation technology at home and abroad, and some achievements have been made (Wang and Qiu, 2015;Wu, 2018;Li, 2020). The existing ventilation scheme is generally modeled based on ordinary long tunnels, or by only taking account of the influence of methane, hydrogen sulfide, dust and other single factors on ventilation, and then calculating the air demand, to determine the fan selection and field equipment layout (Wang, 2016;Chun et al, 2019;He, 2019), without considering the influence of complex construction environment such as extreme coldness and high altitude on the implementation of ventilation scheme during tunnel construction. For high-altitude gas tunnels, under the condition of low pressure and insufficient oxygen, the air supply efficiency of fans is low, and it is easy to cause gas accumulation in the low wind speed area of the tunnel (Luo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Distribution of harmful gas and ventilation length design of high altitude long gas tunnel construction: a case study

Zhang¹,

Juyi

Zhang³

et al. 2023

Front. Earth Sci.

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The air density in high altitude gas tunnel is small and the air supply is difficult. The jet tunnel ventilation is a common construction ventilation mode. In order to explore the pollutant distribution characteristics and the optimal ventilation length of tunnel ventilation in high altitude gas tunnel, Ningchan tunnel has been taken as the engineering background, the fluid dynamics software Fluent has been used to establish a three-dimensional model of jet tunnel ventilation, the distribution characteristics of methane, hydrogen sulfide and other harmful gas in the tunnel have been studied, and the optimal ventilation length of tunnel ventilation in high altitude gas tunnel degree has been explored. The results show that: the minimum ventilation length required in the existing technical specifications of gas tunnel is not reasonable, which leads to the existence of low-speed wind area in the tunnel, and harmful gas is easy to gather in the single head section, and the gas concentration can reach 0.59% at 2 m away from the working face; by reducing the ventilation length, the gas concentration in the single head section can be effectively reduced, and when the ventilation length is 1,200 m, the gas concentration at 2 m away from the working face will be reduced to 0.31%; setting local fan in front of the roadway can also significantly improve the accumulation degree of harmful gas in the single end section. The maximum gas concentration of working face reduced to 0.24%, and the average gas concentration of reduced to 0.15%. The results can provide reference for ventilation scheme of high altitude gas tunnel construction.

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“…Biological treat-ments generally fall into 2 categories: use of microorganisms and use of enzymes (Zabed et al, 2019). Most microorganisms (fungi and bacteria) known to degrade lignin are aerobic (Seidl, 2009;Xu et al, 2018;Zabed et al, 2019); this limits their use in landfills, which have oxygen levels below the surface of 1-2% (Barlaz et al, 2016;Chun, 2014;Eklund et al, 1998). Use of a separate aerobic pre-treatment step for landfill waste would be costly.…”

Section: Introductionmentioning

confidence: 99%

Boosting landfill gas production from lignin-containing wastes via termite hindgut microorganism

et al. 2020

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Lignocellulose comprises a significant portion of municipal solid waste (MSW) À 40-70% in developed countries, including paper, wood, and yard waste. Cellulose and hemicellulose are often shielded by lignin, posing a barrier to waste decomposition and landfill gas generation. Unfortunately, lignin is resistant to microbial degradation under low-oxygen conditions that normally occur in MSW landfills.The bacterium strain TAV5, microaerophilic and member of phylum Verrucomicrobia, isolated from the hindgut of the Reticulitermes flavipes termite, the most widely distributed subterranean termite in North America. Its genome contains genes associated with methylotrophic competency which code for enzymes that structurally modify lignin. The overall goal of this research was to use TAV5 to modify lignin and boost methane production from MSW.Batch-scale reactors (125 mL) were filled with paper, yard, or wood waste, and four ratios of mixed of waste. Reactors were seeded with different ratios of TAV5 to anaerobic digester (AD) microorganisms (representing landfill anaerobic microorganisms). Based on batch tests, optimal ratios of TAV5 to AD microorganisms were used to seed wastes (mixed, yard, and wood) in 6-gallon reactors.Addition of TAV5 increased methane production from mixed waste, yard waste, and wood, by 49%, 34%, and 297%, respectively. TAV5 decreased acid soluble lignin by 7-39%, depending on waste type. TAV5 grown under aerobic conditions and room temperature (not requiring a heated anaerobic chamber) was found to remain viable and increase methane production under low-level oxygen conditions (1-2%). This finding will potentially lessen costs for growing large volumes of it for seeding landfills.

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

Cited by 8 publications

References 6 publications

Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka

Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka

Distribution of harmful gas and ventilation length design of high altitude long gas tunnel construction: a case study

Boosting landfill gas production from lignin-containing wastes via termite hindgut microorganism

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