Methane Oxidation in Three Alberta Soils: Influence of Soil Parameters and Methane Flux Rates

Stein, Vincent B.; Hettiaratchi, J. Patrick A.

doi:10.1080/09593332208618315

Cited by 104 publications

(56 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variation of oxidation potential of landfill cover is examined using data provided by Stein and Hettiaratchi, 36 who report a CH 4 oxidation rate of 20% at a flow rate of 400 g CH 4 (m 2 day) Ϫ1 . Sensitivity to an increase of 100% of the amount of CH 4 oxidized reduced overall GHG emissions by 10%.…”

Section: Uncertainty and Sensitivity Analysismentioning

confidence: 99%

“…35 An Alberta, Canada study suggested that the rate of oxidation is dependent on CH 4 flow rate, suggesting the value of k may influence oxidation. 36 EPA and IPCC (1996 and 2006) make the assumption of 10% oxidation using aerating covering material. Although this may seem low in light of the range suggested above, the more conservative estimate is prudent without sitespecific data.…”

Section: Sensitivity Analysismentioning

confidence: 99%

See 1 more Smart Citation

Greenhouse Gas Emissions from Waste Management—Assessment of Quantification Methods

Mohareb

MacLean

Kennedy

2011

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Of the many sources of urban greenhouse gas (GHG) emissions, solid waste is the only one for which management decisions are undertaken primarily by municipal governments themselves and is hence often the largest component of cities' corporate inventories. It is essential that decision-makers select an appropriate quantification methodology and have an appreciation of methodological strengths and shortcomings. This work compares four different waste emissions quantification methods, including Intergovernmental Panel on Climate Change (IPCC) 1996 guidelines, IPCC 2006 guidelines, U.S. Environmental Protection Agency (EPA) Waste Reduction Model (WARM), and the Federation of Canadian MunicipalitiesPartners for Climate Protection (FCM-PCP) quantification tool. Waste disposal data for the greater Toronto area (GTA) in 2005 are used for all methodologies; treatment options (including landfill, incineration, compost, and anaerobic digestion) are examined where available in methodologies. Landfill was shown to be the greatest source of GHG emissions, contributing more than threequarters of total emissions associated with waste management. Results from the different landfill gas (LFG) quantification approaches ranged from an emissions source of 557 kt carbon dioxide equivalents (CO 2 e) (FCM-PCP) to a carbon sink of Ϫ53 kt CO 2 e (EPA WARM). Similar values were obtained between IPCC approaches. The IPCC 2006 method was found to be more appropriate for inventorying applications because it uses a waste-in-place (WIP) approach, rather than a methane commitment (MC) approach, despite perceived onerous data requirements for WIP. MC approaches were found to be useful from a planning standpoint; however, uncertainty associated with their projections of future parameter values limits their applicability for GHG inventorying. MC and WIP methods provided similar results in this case study; however, this is case specific because of similarity in assumptions of present and future landfill parameters and quantities of annual waste deposited in recent years being relatively consistent.

show abstract

Section: Uncertainty and Sensitivity Analysismentioning

confidence: 99%

Section: Sensitivity Analysismentioning

confidence: 99%

Greenhouse Gas Emissions from Waste Management—Assessment of Quantification Methods

Mohareb

MacLean

Kennedy

2011

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

show abstract

“…Optimal ranges of gravimetric moisture contents to facilitate CH 4 oxidation depend on soil texture, but typically ranges from 11-28%, with upper and lower limits of ≤ 3-7% and ≥ 30-41% (Whalen et al 1990;Stein and Hettiaratchi 2001;.…”

Section: Factors Affecting Ch 4 Oxidationmentioning

confidence: 99%

Pore-gas dynamics in overburden and reclamation soil covers

ScaleKyle

FlemingIan

2019

Environmental Geotechnics

View full text Add to dashboard Cite

Large above-grade overburden landforms comprised of low-grade lean oil sands (LOS) are amassed during the surface mining of oil sands in northern Alberta, Canada. Reclamation soil covers consisting of locally-salvaged soils are subsequently placed above the LOS landforms in single and multi-layered configurations. The soil covers are intended to 1) provide sufficient pore-gas O2 to facilitate the growth of native boreal forest vegetation and to 2) oxidize methane (CH4) produced in the anaerobic zones of the LOS before being exhausted to the atmosphere as a greenhouse gas.Prior to covering the LOS with soil covers, rates of CO2 efflux from the surface of the LOS to the atmosphere ranged from 0.1-7.1 kg/m2/a. Pore-gas concentrations within the uncovered LOS ranged from 0-18% for oxygen (O2), 3-21% for carbon dioxide (CO2), and 0-12% for CH4. Following placement of soil covers, peak rates of CO2 efflux were 2.3 kg/m2/a from the surface of the soil covers to the atmosphere and 1.8 kg/m2/a from the LOS into the soil covers.Peak rates of O2 influx from the atmosphere through the soil covers was 18 kg/m2/a. Poregasses within the overlying soil covers and uppermost LOS were typically below the threshold that poses a risk to the survivability of reclamation vegetation, >10% O2 and <15% CO2. Poregasses deeper than 2 m within the LOS surpassed this threshold with O2 falling to 0% and CO2 rising to >16%.Rates of CH4 oxidation were quantified in batch soil column experiments for the soil cover materials and LOS in single and multi-layered configurations. Oxidation rates were sensitive to variations in temperature, moisture content, and bulk density. The results of the column experiments indicate that CH4 generated deeper than 2 m within the LOS landform will be partially oxidized in both the soil covers and uppermost LOS horizon.Statistical analyses and finite difference numerical modelling were conducted to guide mine operators regarding practical issues involving the construction of LOS landforms, design of soil cover systems, and management of reclamation sites. Based on these exercises, it appears that the characteristics of the LOS landform are more important to pore-gas dynamics than the design of the soil cover systems.iii ACKNOWLEDGEMENTS

show abstract

“…15 CH 4 oxidation in soil takes place because of the presence of methanotrophic bacteria. These metabolize CH 4 into CO 2 through various complex biological pathways.…”

Section: Ch 4 Recovered and Incineratedmentioning

confidence: 99%

Methane Balance of a Bioreactor Landfill in Latin America

Sanderson

Hettiaratchi

Hunte

et al. 2008

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

This paper presents results from a methane (CH 4 ) gas emission characterization survey conducted at the Loma Los Colorados landfill located 60 km from Santiago, Chile. The landfill receives approximately 1 million metric tons (t) of waste annually, and is equipped with leachate control systems and landfill gas collection systems. The collected leachate is recirculated to enable operation of the landfill as a bioreactor. For this study, conducted between April and July 2000, a total of 232 surface emission measurements were made over the 23-ha surface area of the landfill. The average surface flux rate of CH 4 emissions over the landfill surface was 167 g ⅐ m Ϫ2 ⅐ day Ϫ1, and the total quantity of surface emissions was 13,320 t/yr. These values do not include the contribution made by "hot spots," originating from leachate pools caused by "daylighting" of leachate, that were identified on the landfill surface and had very high CH 4 emission rates. Other point sources of CH 4 emissions at this landfill include 20 disconnected gas wells that vent directly to the atmosphere. Additionally, there are 13 gas wells connected to an incinerator responsible for destroying 84 t/yr of CH 4 . The balance also includes CH 4 that is being oxidized on the surface of the landfill by methanotrophic bacteria. Including all sources, except leachate pool emissions, the emissions were estimated to be 14,584 t/yr CH 4 . It was estimated that less than 1% of the gas produced by the decomposition of waste was captured by the gas collection system and 38% of CH 4 generated was emitted to the atmosphere through the soil cover.

show abstract

Methane Oxidation in Three Alberta Soils: Influence of Soil Parameters and Methane Flux Rates

Cited by 104 publications

References 0 publications

Greenhouse Gas Emissions from Waste Management—Assessment of Quantification Methods

Greenhouse Gas Emissions from Waste Management—Assessment of Quantification Methods

Pore-gas dynamics in overburden and reclamation soil covers

Methane Balance of a Bioreactor Landfill in Latin America

Contact Info

Product

Resources

About