Relevance of soil physical properties for the microbial oxidation of methane in landfill covers

Gebert, Julia; Groengroeft, Alexander; Pfeiffer, Eva‐Maria

doi:10.1016/j.soilbio.2010.07.004

Cited by 77 publications

(57 citation statements)

References 35 publications

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“…Further increase or decrease of the grain size resulted in reduced methane oxidation capacity. Gebert et al [45] pointed out that the methane oxidation performance in landfi ll cover is governed by the share of pores available for gas transport, if other environmental variables (e.g. pH and nutrients) are not limiting.…”

Section: Cover Materialsmentioning

confidence: 99%

Role of Landfill Cover in Reducing Methane Emission

Cao¹,

Staszewska²

2013

Archives of Environmental Protection

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Uncontrolled emissions of landfi ll gas may contribute signifi cantly to climate change, since its composition represents a high fraction of methane, a greenhouse gas with 100-year global warming potential 25 times that of carbon dioxide. Landfi ll cover could create favourable conditions for methanotrophy (microbial methane oxidation), an activity of using bacteria to oxidize methane to carbon dioxide. This paper presents a brief review of methanotrophic activities in landfi ll cover. Emphasis is given to the effects of cover materials, environmental conditions and landfi ll vegetation on the methane oxidation potential, and to their underlying effect mechanisms. Methanotrophs communities and methane oxidation kinetics are also discussed. Results from the overview suggest that well-engineered landfi ll cover can substantially increase its potential for reducing emissions of methane produced in landfi ll to the atmosphere.

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Section: Cover Materialsmentioning

confidence: 99%

Role of Landfill Cover in Reducing Methane Emission

Cao¹,

Staszewska²

2013

Archives of Environmental Protection

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“…CO2 levels ranged from 28 v/v% to 40 v/v% depending on spear depth, it is difficult to characterise these trends as there are multiple pathways influencing the CO2 pool. However, when the CH4/CO2 ratios are considered (see Table C-4), qualitative inferences can be made about the activity between the spear regions at Site 1 and 5 as discussed by Chanton et al (2007) and Gebert et al (2011a).…”

Section: C3 Presentation Of Additional Results From Field Monitoringmentioning

confidence: 99%

“…Currently, there is no consensus at what point accounting for composting is necessary. Gebert et al (2011a) assessed the CH4 oxidation and soil respiration/composting ability of a mature landfill final cover in parallel incubations. Gebert et al (2011a) identified that the magnitude of composting was minimal ranging from 0.2 to 14 μg CO2 gdw -1 h -1 .…”

Section: Mass Balance Analysismentioning

confidence: 99%

“…Gebert et al (2011a) assessed the CH4 oxidation and soil respiration/composting ability of a mature landfill final cover in parallel incubations. Gebert et al (2011a) identified that the magnitude of composting was minimal ranging from 0.2 to 14 μg CO2 gdw -1 h -1 . This low level of activity could be explained by the total organic carbon content (TOC) of the soil ranging from 0.4 to 4 w/w%.…”

Section: Mass Balance Analysismentioning

confidence: 99%

“…The effectiveness of engineered bio-covers, phytocaps, intermediate and final soil covers have been assessed in laboratory CH4 oxidation tests, where the cover material is extracted and then incubated at field conditions. Reported laboratory incubations studies have utilised either batch assays for a rapid assessment of the cover media (Bender and Conrad, 1994, Kightley et al, 1995, Czepiel et al, 1996, Börjesson et al, 2004, Albanna and Fernandes, 2009, Röwer et al, 2011, long-term column studies (Humer and Lechner, 1999, Stein and Hettiaratchi, 2001, Pawlowksa et al, 2003, Gebert et al, 2011a, Gebert et al, 2011b or field studies where CH4 oxidation efficiency is based on various combinations of the surface fluxes, concentration profiles of biogas and stable isotopes, depending on the mass balance method being applied to calculate the CH4 oxidation rate (Bogner et al, 1997, Bergamaschi et al, 1998, Börjesson et al, 2000b, Christophersen et al, 2000, Barlaz et al, 2004, Abichou et al, 2006a.…”

Section: Introductionmentioning

confidence: 99%

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Aerobic processes in landfill: an Australian field trial

Obersky¹

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Modern landfills are often thought of as exclusively anaerobic systems, with landfill gas generation and regulatory emission models typically describing waste degradation as a first order decay process.However, in most instances, observed biogas production from landfills fall short of predictions by these landfill gas models. To improve biogas estimates, a closer examination of the configuration and operation of landfills is required, to identify if a significant portion of waste is degraded aerobically.An improved understanding of aerobic processes will contribute towards more accurate landfill gas estimation and emissions reporting.It was hypothesised that the rate and extent of anaerobic digestion (rAD), CH4 oxidation (rOX), and composting (rCOM) within the soil cover and the fresh waste immediately below the cover could be determined by the combination of stable isotope and molecular mass balances for carbon species (CH4 and CO2). The primary objective of this thesis was to determine the extent of simultaneous insitu aerobic (CH4 oxidation and composting) and anaerobic processes occurring in an operational landfill cell. An 18-month field trial was established on a fresh layer of waste placed on a sloped face at the edge of a landfill cell and covered with an interim soil cover (30-50cm).The evolution of CH4, CO2 and O2 through the waste profile and the surface emissions were monitored by gas samples collected from gas probes and static flux chambers. Stable isotopes ( 2 δH for CH4, 13 δC for CH4 and CO2) were monitored. The developed model consisted of four mass balances for CH4, CO2, δ 13 C-CH4 and δ 13 C-CO2 over a control volume that extended approximately 1.5m below the surface, incorporating the soil cover and the uppermost portion of the waste layer.The model was applied to data collected from two locations over four separate sampling campaigns, each representing a climatic season in Brisbane.It was necessary to conduct companion laboratory work to characterise key isotopic parameters in the model, these being (1) CH4 oxidation fractionation factor for the landfill cover soil, (2) anaerobic digestion fractionation factor for the waste, (3) the composting signature of the landfill cover and waste. The sensitivity of predictions of rAD, rCOM and rOX to the values of these parameters as well as the stoichiometry of the three reaction processes was assessed by randomly varying each parameter by ±5% over 500 simulations for each data set.iii The mass balance model revealed that aerobic activity forms a large proportion of early degradation

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CO₂ fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method

Luther-Mosebach

Kalinski

Gröngröft

et al. 2016

J. Plant Nutr. Soil Sci.

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On the plot scale, closed dynamic chamber methods (CDCM) are the most popular technique to directly measure CO2 fluxes from the soil surface to the atmosphere. However, the gradient method (GM) provides several advantages, which refer to the underground processes contributing to the CO2 production that cannot be investigated by the CDCM. To evaluate the suitability of the GM in dryland soils, we compared feasibility and quality of results for both methods. The GM is based on Fick's law and requires knowledge on diffusion properties of the soil, concentration gradients between soil and atmosphere, and the air‐filled porosity. Our study was conducted on two sites along the Okavango River, one in Namibia (semi‐arid) and the other in Angola (semi‐humid) with comparable sandy soil texture. The CO2 concentration profile was determined by collecting soil gas samples from different soil depths. CO2 efflux was measured with a vented steady‐state closed chamber system. Soil gas diffusivities were measured in lab experiments using diffusion chambers and undisturbed soil cores. Modeled diffusivities were predicted according to six popular models based on air‐filled porosity and total porosity as input parameters. Results show strong agreement between CDCM and GM fluxes based on measured diffusivities. However, with modeled diffusivities overestimation of fluxes for most of the tested models, especially at high air‐filled porosity, were detected. We conclude that the GM offers a valuable tool for flux estimates on the pedon scale in dry ecosystems particularly in combination with measured diffusivities and includes the possibility for investigating subsurface processes involved in the CO2 production.

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Relevance of soil physical properties for the microbial oxidation of methane in landfill covers

Cited by 77 publications

References 35 publications

Role of Landfill Cover in Reducing Methane Emission

Role of Landfill Cover in Reducing Methane Emission

Aerobic processes in landfill: an Australian field trial

CO₂ fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method

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Relevance of soil physical properties for the microbial oxidation of methane in landfill covers

Cited by 77 publications

References 35 publications

Role of Landfill Cover in Reducing Methane Emission

Role of Landfill Cover in Reducing Methane Emission

Aerobic processes in landfill: an Australian field trial

CO2 fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method

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Product

Resources

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CO₂ fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method