Methane oxidation potential of boreal landfill cover materials: The governing factors and enhancement by nutrient manipulation

Env Prog and Sustain Energy

et al. 2019

Waste disposal sector is an important anthropogenic source of greenhouse gas (GHG) emissions; therefore, it is important to accurately estimate GHG budget of waste disposal activities and evaluate its contribution to global GHG emissions. Based on the GHG inventory guidelines provided by the Intergovernmental Panel on Climate Change, this study calculated GHGs from the municipal solid waste (MSW) disposal sector (including landfill, incineration, and compost) in China during the period 2002-2017. Overall GHG emission from the MSW disposal sector increased from 30,392.0 Gg CO 2 in 2002 to 76,623.0 Gg in 2017. MSW landfill contributed most to GHG emissions as indicated by the emission share of landfill decreasing from a peak value of 93.5% in 2002 to 65.8% in 2017. GHG emissions from MSW incineration increased rapidly from less than 3.0% in 2002 to 32.8% in 2017. In 2017, East China contributed the most among the seven regions of China, while the Northwest contributed the least. Methane mitigation technologies such as landfill gas to energy projects and functional solid cover utilization are the primary measures for reducing GHG emissions from landfill; conversion of the treatment method from landfill to incineration is another effective measure; MSW sorting and source reduction of waste amounts prior to incineration were also found to be promising strategies. K E Y W O R D S climate change, GHG emission inventory, incinerator, landfill, municipal solid waste

Section: Resultsmentioning

confidence: 99%

Implications of municipal solid waste disposal methods in China on greenhouse gas emissions

Env Prog and Sustain Energy

et al. 2019

“…Improving the CH 4 oxidation efficiency in the cover soil is a costeffective and practical measure for landfill CH 4 mitigation. During the landfill operation period, using aged refuse and compost as a functional cover soil instead of local loess has been proved to be an effective measure to mitigate fugitive CH 4 emission 32,[34][35][36] After closure, choosing functional material as the final cover soil would also be a feasible strategy for CH 4 mitigation. In addition to CH 4 mitigation, improving the LFG collection efficiency and the efficiency of the gas engine would also be an effective measure for CH 4 mitigation.…”

Section: Lfg Mitigation Strategymentioning

confidence: 99%

Methane emissions and energy generation potential from a municipal solid waste landfill based on inventory models: A case study

Env Prog and Sustain Energy

Chen

et al. 2021

Municipal solid waste (MSW) landfills are the third largest source of anthropogenic methane (CH 4 ) emission. Evaluating the CH 4 emission and energy generation potential of MSW landfills facilitates the development of appropriate measures for mitigation and recovery of CH 4 . This study evaluated the CH 4 generation, CH 4 emissions and potential energy generation capacity of Jiangcungou MSW landfill, Xi'an, China, during its operation and closure period using three inventory models, including the IPCC default method (DM), IPCC first-order decay (FOD), and US EPA Landfill Gas Emissions Mode (LandGEM). Based on the DM, FOD and LandGEM models, the total estimated CH 4 emissions in 1994-2060 were 755.0, 348.9, and 344.9 Gg, respectively. There is a huge potential for electricity generation after the closure of the landfill, and the potential energy generation for 2020 was 688.3 MkW h and 599.7 MkW h. However, the actual electricity generation ranged from 12.4% to 74.1% and 14.2% to 61.8% of the potential electricity generation during the operation period (2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017) for the FOD and LandGEM methods, respectively. Improving the efficiency associated with LFG collection and gas engine from the landfill after closure can be an effective measure to mitigate greenhouse effects and increase investment payments.

“…Due to their strong CH 4 oxidation potential, compost and aged refuse have been applied as biocovers for landfills with effective mitigation of CH 4 emissions (Charlotte et al, 2009; He et al, 2012; Maanoja and Rintala, 2015; Nemanja et al, 2012; Sadasivam and Reddy, 2013; Yang et al, 2017). Leachate irrigation to landfill cover soil is an effective measure to reduce leachate volume and stimulate waste degradation (Bowman et al, 2002; Yangfei et al, 2012; Zhang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Effect of soil types and ammonia concentrations on the contribution of ammonia-oxidizing bacteria to CH₄oxidation

Shi²,

Duan³

et al. 2019

Waste Manag Res

Irrigation of stabilized landfill leachate to landfill cover soil is a cost-effective operation for leachate treatment. The contribution of ammonia-oxidizing bacteria (AOB) in the cover soil to CH 4 oxidation, however, is unclear, because AOB and methane-oxidizing bacteria (MOB) can co-oxidize CH 4 and NH 4 + -N. Thus, the contribution of AOB and the inhibitory effect of NH 4 + -N to CH 4 oxidation were determined by using an acetylene pretreatment discrimination method. The results showed that the contributions of AOB to CH 4 oxidation varied with the soil type and the concentration of NH 4 + -N addition. The relative contribution of AOB to CH 4 oxidation for compost without NH 4 + -N addition was the highest (65.0%), and was 2.5 and 3.4 times higher than the corresponding values for aged refuse and landfill cover soil, respectively. The inhibitory effect of NH 4 + -N was enhanced by increasing the concentration of NH 4 + -N addition for all the soil samples. At equal NH 4 + -N addition concentrations, the inhibitory effect was always the lowest for the compost sample. The abundances of particulate methane monooxygenase (pmoA) and ammonia monooxygenase (amoA) genes were key factors influencing the CH 4 oxidation rate and contribution of AOB to CH 4 oxidation. The higher abundance of pmoA and lower abundance of amoA in landfill cover soil could explain the higher CH 4 oxidation rate and lower contribution of AOB to CH 4 oxidation in this soil type. Meanwhile, the higher contribution of AOB to CH 4 oxidation for compost could be attributed to the higher abundance of the amoA gene and lower abundance of pmoA.